Ignition + TurboFan: Node.js benchmarks

[vsemozhetbyt]

• Version: 8.0
• Platform: Windows 7 x64
• Subsystem: v8, benchmark

This commit in the v8/node/vee-eight-lkgr has turned the new Ignition+TurboFan pipeline on by default. To see the performance impact, I've built vee-eight-lkgr before and after this commit and have started common Node.js benchmark suites with them.
Both builds have these same versions:

{ http_parser: '2.7.0',
  node: '8.0.0-pre',
  v8: '5.9.0 (candidate)',
  uv: '1.11.0',
  zlib: '1.2.11',
  ares: '1.10.1-DEV',
  modules: '56',
  openssl: '1.0.2k',
  icu: '58.2',
  unicode: '9.0',
  cldr: '30.0.3',
  tz: '2016j' }

As my machine is not a fast one, I will post the results piecemeal.

UPD. All suites are complete.

TOC:

• arrays (+ fixed benchmarks)
• assert
• buffers (+ buffer-swap.js with --set n=1e6)
• child_process
• crypto
• dgram
• domain
• es (+ new foreach-bench.js)
• events
• fs
• http
• misc
• module
• net (except tcp-raw-pipe.js)
• os
• path
• process
• querystring
• streams (+ on Windows)
• string_decoder
• timers (+ on Windows)
• tls
• url
• util
• vm (+ on Windows)

[vsemozhetbyt]

arrays:

                                                improvement confidence      p.value
 arrays\\var-int.js n=25 type="Array"                2.12 %        *** 1.911996e-11
 arrays\\var-int.js n=25 type="Buffer"              -1.39 %        *** 2.953185e-13
 arrays\\var-int.js n=25 type="Float32Array"         1.36 %        *** 4.482114e-21
 arrays\\var-int.js n=25 type="Float64Array"        -1.29 %        *** 3.712094e-13
 arrays\\var-int.js n=25 type="Int16Array"          -1.71 %        *** 3.185373e-15
 arrays\\var-int.js n=25 type="Int32Array"          -0.84 %        *** 3.184537e-04
 arrays\\var-int.js n=25 type="Int8Array"           -1.43 %        *** 2.081429e-16
 arrays\\var-int.js n=25 type="Uint16Array"         -1.61 %        *** 1.591048e-17
 arrays\\var-int.js n=25 type="Uint32Array"         -0.51 %          * 4.560219e-02
 arrays\\var-int.js n=25 type="Uint8Array"          -1.42 %        *** 3.315598e-35
 arrays\\zero-float.js n=25 type="Array"            -0.29 %          * 2.067735e-02
 arrays\\zero-float.js n=25 type="Buffer"            0.81 %        *** 1.432181e-14
 arrays\\zero-float.js n=25 type="Float32Array"     10.16 %        *** 1.887618e-43
 arrays\\zero-float.js n=25 type="Float64Array"      0.37 %         ** 1.180476e-03
 arrays\\zero-float.js n=25 type="Int16Array"       -1.19 %        *** 7.951452e-28
 arrays\\zero-float.js n=25 type="Int32Array"       -6.52 %        *** 1.214743e-42
 arrays\\zero-float.js n=25 type="Int8Array"       -17.88 %        *** 7.204014e-81
 arrays\\zero-float.js n=25 type="Uint16Array"      -1.16 %        *** 2.603611e-21
 arrays\\zero-float.js n=25 type="Uint32Array"      -6.40 %        *** 5.803861e-43
 arrays\\zero-float.js n=25 type="Uint8Array"      -17.86 %        *** 7.705079e-84
 arrays\\zero-int.js n=25 type="Array"              -0.43 %          * 3.411995e-02
 arrays\\zero-int.js n=25 type="Buffer"              0.93 %        *** 3.097691e-12
 arrays\\zero-int.js n=25 type="Float32Array"       10.41 %        *** 3.242834e-58
 arrays\\zero-int.js n=25 type="Float64Array"        0.61 %         ** 6.996484e-03
 arrays\\zero-int.js n=25 type="Int16Array"         -1.18 %        *** 7.198962e-17
 arrays\\zero-int.js n=25 type="Int32Array"         -6.24 %        *** 2.192567e-42
 arrays\\zero-int.js n=25 type="Int8Array"         -17.80 %        *** 4.249127e-61
 arrays\\zero-int.js n=25 type="Uint16Array"        -1.04 %        *** 1.051799e-17
 arrays\\zero-int.js n=25 type="Uint32Array"        -6.41 %        *** 7.414706e-53
 arrays\\zero-int.js n=25 type="Uint8Array"        -17.98 %        *** 6.231374e-72

[vsemozhetbyt]

assert:

                                                                                                   improvement confidence      p.value
 assert\\deepequal-buffer.js method="nonstrict" len=100 n=1000                                          6.08 %        *** 2.240694e-16
 assert\\deepequal-buffer.js method="strict" len=100 n=1000                                             6.36 %        *** 1.715121e-08
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="array"         11.16 %        *** 3.089537e-20
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="boolean"       11.65 %        *** 6.319150e-35
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="new-array"     11.43 %        *** 1.019362e-28
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="null"          11.81 %        *** 6.516888e-28
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="number"        10.07 %        *** 3.636875e-23
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="object"        11.48 %        *** 2.818413e-35
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="string"        11.38 %        *** 8.847026e-29
 assert\\deepequal-prims-and-objs-big-array.js method="nonstrict" len=100000 n=25 prim="undefined"     11.83 %        *** 2.848567e-29
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="array"            11.18 %        *** 1.020906e-28
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="boolean"          10.51 %        *** 5.346165e-17
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="new-array"        11.35 %        *** 6.250137e-27
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="null"             10.45 %        *** 2.073088e-24
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="number"           10.37 %        *** 1.018234e-15
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="object"           10.44 %        *** 3.487968e-24
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="string"           11.79 %        *** 1.710809e-38
 assert\\deepequal-prims-and-objs-big-array.js method="strict" len=100000 n=25 prim="undefined"        10.91 %        *** 3.133955e-27
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="array"                39.25 %        *** 2.220953e-63
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="boolean"              39.48 %        *** 3.117618e-82
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="new-array"            40.43 %        *** 1.118514e-73
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="null"                 39.43 %        *** 6.743661e-77
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="number"               36.70 %        *** 8.813610e-64
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="object"               40.04 %        *** 2.289447e-64
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="string"               39.03 %        *** 1.345610e-76
 assert\\deepequal-prims-and-objs-big-loop.js method="nonstrict" n=1000000 prim="undefined"            39.12 %        *** 2.970695e-76
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="array"                   36.64 %        *** 3.348739e-60
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="boolean"                 33.43 %        *** 1.410337e-65
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="new-array"               35.21 %        *** 6.250969e-64
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="null"                    33.86 %        *** 1.815821e-64
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="number"                  32.49 %        *** 2.435150e-57
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="object"                  36.99 %        *** 3.538131e-46
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="string"                  33.83 %        *** 2.264266e-56
 assert\\deepequal-prims-and-objs-big-loop.js method="strict" n=1000000 prim="undefined"               34.27 %        *** 2.675520e-61
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Float32Array"              -11.66 %        *** 7.849993e-27
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Float64Array"              -11.36 %        *** 3.903625e-29
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Int16Array"                  8.10 %        *** 1.298645e-16
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Int32Array"                  6.88 %        *** 4.351738e-15
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Int8Array"                  10.21 %        *** 3.566406e-21
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint16Array"                 6.94 %        *** 6.770045e-14
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint32Array"                 7.38 %        *** 1.083080e-12
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint8Array"                  7.85 %        *** 5.187461e-18
 assert\\deepequal-typedarrays.js len=1000000 method="nonstrict" n=1 type="Uint8ClampedArray"           8.13 %        *** 7.616631e-16
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Float32Array"                 -11.03 %        *** 6.610454e-66
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Float64Array"                 -11.06 %        *** 2.551550e-46
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Int16Array"                     0.60 %            5.300335e-01
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Int32Array"                     0.09 %            8.860152e-01
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Int8Array"                      5.09 %        *** 2.161384e-04
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint16Array"                    3.97 %         ** 2.187538e-03
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint32Array"                    0.90 %            4.287213e-01
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint8Array"                     1.67 %            9.340617e-02
 assert\\deepequal-typedarrays.js len=1000000 method="strict" n=1 type="Uint8ClampedArray"              3.99 %        *** 9.655741e-04

[mscdex]

Yikes... those performance hits... especially for Uint8Array.

[hashseed]

There is still improvements being made in the area of TypedArrays: https://bugs.chromium.org/p/v8/issues/detail?id=5977

[Fishrock123]

Hmm yeah I think we should definitely keep an eye on that before merging. We use UInt8Array a lot.

[hashseed]

@bmeurer @psmarshall could we keep an eye on this?

[bmeurer]

Yes, this is mostly known. We know that there's some work to be done, not only for TypedArrays.

[vsemozhetbyt]

I had to abort buffer-swap.js benchmark after 2 runs because 1 run lasts ~ 2.5 hours, so default 60 runs would take 6 days. Maybe somebody with a free fast machine will be able to run a whole buffer-swap.js cycle later.

buffers:

                                                                                                                                                  improvement confidence      p.value
 buffers\\buffer-base64-decode.js n=32                                                                                                               -0.03 %            6.813796e-01
 buffers\\buffer-base64-encode.js n=32 len=67108864                                                                                                   0.10 %            7.395115e-02
 buffers\\buffer-bytelength.js n=5000000 len=1 encoding="base64"                                                                                     16.14 %        *** 5.629742e-46
 buffers\\buffer-bytelength.js n=5000000 len=1 encoding="utf8"                                                                                      -36.00 %        *** 2.712131e-60
 buffers\\buffer-bytelength.js n=5000000 len=16 encoding="base64"                                                                                    17.67 %        *** 8.234877e-53
 buffers\\buffer-bytelength.js n=5000000 len=16 encoding="utf8"                                                                                      -9.00 %        *** 6.554314e-47
 buffers\\buffer-bytelength.js n=5000000 len=2 encoding="base64"                                                                                     14.62 %        *** 1.496880e-30
 buffers\\buffer-bytelength.js n=5000000 len=2 encoding="utf8"                                                                                      -27.22 %        *** 4.940651e-70
 buffers\\buffer-bytelength.js n=5000000 len=256 encoding="base64"                                                                                   15.63 %        *** 5.408900e-35
 buffers\\buffer-bytelength.js n=5000000 len=256 encoding="utf8"                                                                                     -1.68 %        *** 1.306409e-05
 buffers\\buffer-bytelength.js n=5000000 len=4 encoding="base64"                                                                                     17.38 %        *** 8.353420e-48
 buffers\\buffer-bytelength.js n=5000000 len=4 encoding="utf8"                                                                                      -23.14 %        *** 2.336540e-62
 buffers\\buffer-bytelength.js n=5000000 len=64 encoding="base64"                                                                                    17.70 %        *** 9.030145e-49
 buffers\\buffer-bytelength.js n=5000000 len=64 encoding="utf8"                                                                                      -3.25 %        *** 2.280305e-12
 buffers\\buffer-compare-instance-method.js millions=1 args=1 size=1024                                                                             -11.50 %        *** 2.000140e-17
 buffers\\buffer-compare-instance-method.js millions=1 args=1 size=16                                                                               -12.12 %        *** 2.153111e-25
 buffers\\buffer-compare-instance-method.js millions=1 args=1 size=16386                                                                              2.15 %            3.759710e-01
 buffers\\buffer-compare-instance-method.js millions=1 args=1 size=4096                                                                             -11.47 %        *** 1.230915e-05
 buffers\\buffer-compare-instance-method.js millions=1 args=1 size=512                                                                              -10.09 %        *** 3.727958e-19
 buffers\\buffer-compare-instance-method.js millions=1 args=2 size=1024                                                                             -19.04 %        *** 7.673003e-27
 buffers\\buffer-compare-instance-method.js millions=1 args=2 size=16                                                                               -21.40 %        *** 3.935922e-62
 buffers\\buffer-compare-instance-method.js millions=1 args=2 size=16386                                                                             -2.74 %            1.174619e-01
 buffers\\buffer-compare-instance-method.js millions=1 args=2 size=4096                                                                             -15.96 %        *** 7.638449e-11
 buffers\\buffer-compare-instance-method.js millions=1 args=2 size=512                                                                              -19.64 %        *** 5.566149e-30
 buffers\\buffer-compare-instance-method.js millions=1 args=3 size=1024                                                                             -16.32 %        *** 9.753637e-24
 buffers\\buffer-compare-instance-method.js millions=1 args=3 size=16                                                                               -19.00 %        *** 2.905866e-60
 buffers\\buffer-compare-instance-method.js millions=1 args=3 size=16386                                                                             -3.50 %        *** 3.463127e-04
 buffers\\buffer-compare-instance-method.js millions=1 args=3 size=4096                                                                             -15.93 %        *** 6.136367e-12
 buffers\\buffer-compare-instance-method.js millions=1 args=3 size=512                                                                              -17.67 %        *** 2.211209e-33
 buffers\\buffer-compare-instance-method.js millions=1 args=4 size=1024                                                                             -17.24 %        *** 3.824330e-29
 buffers\\buffer-compare-instance-method.js millions=1 args=4 size=16                                                                               -19.58 %        *** 1.338838e-38
 buffers\\buffer-compare-instance-method.js millions=1 args=4 size=16386                                                                             -3.50 %        *** 2.668278e-06
 buffers\\buffer-compare-instance-method.js millions=1 args=4 size=4096                                                                             -15.32 %        *** 4.822259e-11
 buffers\\buffer-compare-instance-method.js millions=1 args=4 size=512                                                                              -16.30 %        *** 3.251165e-25
 buffers\\buffer-compare-instance-method.js millions=1 args=5 size=1024                                                                              -0.20 %            8.718793e-01
 buffers\\buffer-compare-instance-method.js millions=1 args=5 size=16                                                                                -0.35 %            3.508750e-01
 buffers\\buffer-compare-instance-method.js millions=1 args=5 size=16386                                                                              3.04 %         ** 1.167276e-03
 buffers\\buffer-compare-instance-method.js millions=1 args=5 size=4096                                                                              -4.48 %          * 3.204543e-02
 buffers\\buffer-compare-instance-method.js millions=1 args=5 size=512                                                                                1.06 %            8.748816e-02
 buffers\\buffer-compare-offset.js millions=1 size=1024 method="offset"                                                                              -3.03 %        *** 1.757880e-11
 buffers\\buffer-compare-offset.js millions=1 size=1024 method="slice"                                                                                7.19 %        *** 9.960328e-16
 buffers\\buffer-compare-offset.js millions=1 size=16 method="offset"                                                                                -3.49 %        *** 1.237199e-11
 buffers\\buffer-compare-offset.js millions=1 size=16 method="slice"                                                                                  7.24 %        *** 1.006812e-19
 buffers\\buffer-compare-offset.js millions=1 size=16386 method="offset"                                                                             -3.00 %        *** 5.300663e-09
 buffers\\buffer-compare-offset.js millions=1 size=16386 method="slice"                                                                               7.22 %        *** 6.424469e-16
 buffers\\buffer-compare-offset.js millions=1 size=4096 method="offset"                                                                              -3.75 %        *** 2.294207e-14
 buffers\\buffer-compare-offset.js millions=1 size=4096 method="slice"                                                                                7.18 %        *** 3.934175e-20
 buffers\\buffer-compare-offset.js millions=1 size=512 method="offset"                                                                               -3.34 %        *** 2.742405e-11
 buffers\\buffer-compare-offset.js millions=1 size=512 method="slice"                                                                                 7.59 %        *** 8.893416e-20
 buffers\\buffer-compare.js millions=1 size=1024                                                                                                    -21.69 %        *** 2.710130e-27
 buffers\\buffer-compare.js millions=1 size=16                                                                                                      -27.15 %        *** 4.754943e-54
 buffers\\buffer-compare.js millions=1 size=16386                                                                                                    -5.12 %         ** 1.333052e-03
 buffers\\buffer-compare.js millions=1 size=4096                                                                                                    -16.47 %        *** 2.029561e-11
 buffers\\buffer-compare.js millions=1 size=512                                                                                                     -23.08 %        *** 9.287436e-34
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=1 pieces=1                                                                             -4.73 %        *** 7.982186e-07
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=1 pieces=16                                                                           -26.40 %        *** 4.427981e-42
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=1 pieces=4                                                                            -19.26 %        *** 1.195433e-37
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=16 pieces=1                                                                            -9.86 %        *** 9.593113e-24
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=16 pieces=16                                                                          -24.97 %        *** 3.166334e-28
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=16 pieces=4                                                                           -21.01 %        *** 2.224996e-52
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=256 pieces=1                                                                           -6.38 %        *** 4.025680e-17
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=256 pieces=16                                                                         -12.39 %        *** 1.076091e-51
 buffers\\buffer-concat.js n=1024 withTotalLength=0 pieceSize=256 pieces=4                                                                          -13.81 %        *** 2.545945e-52
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=1 pieces=1                                                                             -3.94 %        *** 4.046170e-11
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=1 pieces=16                                                                           -29.76 %        *** 1.779827e-50
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=1 pieces=4                                                                            -19.35 %        *** 1.488346e-44
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=16 pieces=1                                                                           -12.40 %        *** 2.748948e-26
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=16 pieces=16                                                                          -30.48 %        *** 5.782960e-53
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=16 pieces=4                                                                           -22.38 %        *** 2.518032e-47
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=256 pieces=1                                                                           -7.67 %        *** 1.012370e-17
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=256 pieces=16                                                                         -13.33 %        *** 6.172313e-47
 buffers\\buffer-concat.js n=1024 withTotalLength=1 pieceSize=256 pieces=4                                                                          -12.97 %        *** 1.221396e-50
 buffers\\buffer-creation.js n=1024 len=10 type="buffer()"                                                                                           -5.87 %        *** 9.479277e-09
 buffers\\buffer-creation.js n=1024 len=10 type="fast-alloc-fill"                                                                                    17.73 %        *** 7.279321e-26
 buffers\\buffer-creation.js n=1024 len=10 type="fast-alloc"                                                                                         -7.55 %        *** 2.297406e-13
 buffers\\buffer-creation.js n=1024 len=10 type="fast-allocUnsafe"                                                                                  -10.28 %        *** 7.217664e-17
 buffers\\buffer-creation.js n=1024 len=10 type="slow-allocUnsafe"                                                                                   14.11 %        *** 3.181184e-20
 buffers\\buffer-creation.js n=1024 len=10 type="slow"                                                                                               13.62 %        *** 1.207137e-22
 buffers\\buffer-creation.js n=1024 len=1024 type="buffer()"                                                                                         -3.41 %         ** 1.440904e-03
 buffers\\buffer-creation.js n=1024 len=1024 type="fast-alloc-fill"                                                                                   9.64 %        *** 1.272331e-12
 buffers\\buffer-creation.js n=1024 len=1024 type="fast-alloc"                                                                                        2.22 %          * 3.739922e-02
 buffers\\buffer-creation.js n=1024 len=1024 type="fast-allocUnsafe"                                                                                 -1.65 %            8.510120e-02
 buffers\\buffer-creation.js n=1024 len=1024 type="slow-allocUnsafe"                                                                                 10.84 %        *** 2.302591e-14
 buffers\\buffer-creation.js n=1024 len=1024 type="slow"                                                                                             11.07 %        *** 5.350467e-17
 buffers\\buffer-creation.js n=1024 len=2048 type="buffer()"                                                                                         -1.89 %            7.896093e-02
 buffers\\buffer-creation.js n=1024 len=2048 type="fast-alloc-fill"                                                                                   5.82 %        *** 1.278769e-06
 buffers\\buffer-creation.js n=1024 len=2048 type="fast-alloc"                                                                                        0.56 %            6.263182e-01
 buffers\\buffer-creation.js n=1024 len=2048 type="fast-allocUnsafe"                                                                                 -0.13 %            8.992751e-01
 buffers\\buffer-creation.js n=1024 len=2048 type="slow-allocUnsafe"                                                                                  7.31 %        *** 4.140525e-09
 buffers\\buffer-creation.js n=1024 len=2048 type="slow"                                                                                              7.26 %        *** 1.368239e-08
 buffers\\buffer-creation.js n=1024 len=4096 type="buffer()"                                                                                          6.40 %        *** 1.419849e-07
 buffers\\buffer-creation.js n=1024 len=4096 type="fast-alloc-fill"                                                                                   3.58 %         ** 4.131086e-03
 buffers\\buffer-creation.js n=1024 len=4096 type="fast-alloc"                                                                                        0.23 %            8.587182e-01
 buffers\\buffer-creation.js n=1024 len=4096 type="fast-allocUnsafe"                                                                                  5.57 %        *** 1.204951e-04
 buffers\\buffer-creation.js n=1024 len=4096 type="slow-allocUnsafe"                                                                                  4.85 %        *** 3.717312e-05
 buffers\\buffer-creation.js n=1024 len=4096 type="slow"                                                                                              5.49 %        *** 2.288046e-06
 buffers\\buffer-creation.js n=1024 len=8192 type="buffer()"                                                                                          7.39 %        *** 1.701336e-07
 buffers\\buffer-creation.js n=1024 len=8192 type="fast-alloc-fill"                                                                                   4.18 %         ** 2.611444e-03
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 buffers\\buffer-read.js millions=1 type="FloatBE" buffer="fast" noAssert="true"                                                                    -37.52 %        *** 4.027095e-77
 buffers\\buffer-read.js millions=1 type="FloatBE" buffer="slow" noAssert="false"                                                                   -36.55 %        *** 1.428981e-66
 buffers\\buffer-read.js millions=1 type="FloatBE" buffer="slow" noAssert="true"                                                                    -37.41 %        *** 2.018451e-76
 buffers\\buffer-read.js millions=1 type="FloatLE" buffer="fast" noAssert="false"                                                                   -38.29 %        *** 4.356237e-53
 buffers\\buffer-read.js millions=1 type="FloatLE" buffer="fast" noAssert="true"                                                                    -40.63 %        *** 5.012620e-81
 buffers\\buffer-read.js millions=1 type="FloatLE" buffer="slow" noAssert="false"                                                                   -38.80 %        *** 3.198838e-55
 buffers\\buffer-read.js millions=1 type="FloatLE" buffer="slow" noAssert="true"                                                                    -40.26 %        *** 7.326122e-70
 buffers\\buffer-read.js millions=1 type="Int16BE" buffer="fast" noAssert="false"                                                                    19.06 %        *** 1.403670e-30
 buffers\\buffer-read.js millions=1 type="Int16BE" buffer="fast" noAssert="true"                                                                    -27.04 %        *** 2.933201e-43
 buffers\\buffer-read.js millions=1 type="Int16BE" buffer="slow" noAssert="false"                                                                    18.64 %        *** 1.137060e-36
 buffers\\buffer-read.js millions=1 type="Int16BE" buffer="slow" noAssert="true"                                                                    -27.24 %        *** 1.160528e-32
 buffers\\buffer-read.js millions=1 type="Int16LE" buffer="fast" noAssert="false"                                                                    19.66 %        *** 1.784479e-29
 buffers\\buffer-read.js millions=1 type="Int16LE" buffer="fast" noAssert="true"                                                                    -27.80 %        *** 1.643164e-42
 buffers\\buffer-read.js millions=1 type="Int16LE" buffer="slow" noAssert="false"                                                                    18.40 %        *** 7.945532e-36
 buffers\\buffer-read.js millions=1 type="Int16LE" buffer="slow" noAssert="true"                                                                    -26.02 %        *** 4.235541e-26
 buffers\\buffer-read.js millions=1 type="Int32BE" buffer="fast" noAssert="false"                                                                    -1.19 %            3.034823e-01
 buffers\\buffer-read.js millions=1 type="Int32BE" buffer="fast" noAssert="true"                                                                    -47.40 %        *** 1.243172e-43
 buffers\\buffer-read.js millions=1 type="Int32BE" buffer="slow" noAssert="false"                                                                     0.81 %            2.872066e-01
 buffers\\buffer-read.js millions=1 type="Int32BE" buffer="slow" noAssert="true"                                                                    -47.13 %        *** 9.286128e-28
 buffers\\buffer-read.js millions=1 type="Int32LE" buffer="fast" noAssert="false"                                                                     2.62 %         ** 6.505751e-03
 buffers\\buffer-read.js millions=1 type="Int32LE" buffer="fast" noAssert="true"                                                                    -42.77 %        *** 9.960392e-42
 buffers\\buffer-read.js millions=1 type="Int32LE" buffer="slow" noAssert="false"                                                                     2.59 %        *** 3.431484e-05
 buffers\\buffer-read.js millions=1 type="Int32LE" buffer="slow" noAssert="true"                                                                    -42.23 %        *** 2.721267e-36
 buffers\\buffer-read.js millions=1 type="Int8" buffer="fast" noAssert="false"                                                                       14.11 %        *** 1.021695e-36
 buffers\\buffer-read.js millions=1 type="Int8" buffer="fast" noAssert="true"                                                                       -26.83 %        *** 1.598243e-41
 buffers\\buffer-read.js millions=1 type="Int8" buffer="slow" noAssert="false"                                                                       13.58 %        *** 4.622852e-34
 buffers\\buffer-read.js millions=1 type="Int8" buffer="slow" noAssert="true"                                                                       -26.74 %        *** 3.749623e-44
 buffers\\buffer-read.js millions=1 type="UInt16BE" buffer="fast" noAssert="false"                                                                    4.00 %        *** 9.770175e-10
 buffers\\buffer-read.js millions=1 type="UInt16BE" buffer="fast" noAssert="true"                                                                   -43.99 %        *** 2.389208e-53
 buffers\\buffer-read.js millions=1 type="UInt16BE" buffer="slow" noAssert="false"                                                                    3.02 %        *** 2.438014e-11
 buffers\\buffer-read.js millions=1 type="UInt16BE" buffer="slow" noAssert="true"                                                                   -43.48 %        *** 1.778761e-52
 buffers\\buffer-read.js millions=1 type="UInt16LE" buffer="fast" noAssert="false"                                                                    7.27 %        *** 7.607707e-19
 buffers\\buffer-read.js millions=1 type="UInt16LE" buffer="fast" noAssert="true"                                                                   -37.75 %        *** 1.282249e-42
 buffers\\buffer-read.js millions=1 type="UInt16LE" buffer="slow" noAssert="false"                                                                    6.32 %        *** 1.510428e-13
 buffers\\buffer-read.js millions=1 type="UInt16LE" buffer="slow" noAssert="true"                                                                   -39.37 %        *** 1.188848e-49
 buffers\\buffer-read.js millions=1 type="UInt32BE" buffer="fast" noAssert="false"                                                                   -6.57 %        *** 2.519559e-15
 buffers\\buffer-read.js millions=1 type="UInt32BE" buffer="fast" noAssert="true"                                                                   -50.93 %        *** 1.031245e-44
 buffers\\buffer-read.js millions=1 type="UInt32BE" buffer="slow" noAssert="false"                                                                   -7.23 %        *** 5.927445e-26
 buffers\\buffer-read.js millions=1 type="UInt32BE" buffer="slow" noAssert="true"                                                                   -51.02 %        *** 4.138643e-51
 buffers\\buffer-read.js millions=1 type="UInt32LE" buffer="fast" noAssert="false"                                                                   -4.94 %        *** 1.291956e-09
 buffers\\buffer-read.js millions=1 type="UInt32LE" buffer="fast" noAssert="true"                                                                   -49.31 %        *** 2.610133e-49
 buffers\\buffer-read.js millions=1 type="UInt32LE" buffer="slow" noAssert="false"                                                                   -5.06 %        *** 8.029210e-16
 buffers\\buffer-read.js millions=1 type="UInt32LE" buffer="slow" noAssert="true"                                                                   -48.99 %        *** 3.672503e-40
 buffers\\buffer-read.js millions=1 type="UInt8" buffer="fast" noAssert="false"                                                                     -13.40 %        *** 8.950667e-29
 buffers\\buffer-read.js millions=1 type="UInt8" buffer="fast" noAssert="true"                                                                      -54.61 %        *** 4.233053e-39
 buffers\\buffer-read.js millions=1 type="UInt8" buffer="slow" noAssert="false"                                                                     -12.84 %        *** 6.666907e-28
 buffers\\buffer-read.js millions=1 type="UInt8" buffer="slow" noAssert="true"                                                                      -54.34 %        *** 2.847385e-36
 buffers\\buffer-slice.js n=1024 type="fast"                                                                                                         18.66 %        *** 4.017939e-23
 buffers\\buffer-slice.js n=1024 type="slow"                                                                                                         18.22 %        *** 5.380341e-28
 buffers\\buffer-tojson.js len=0 n=10000                                                                                                            -29.94 %        *** 2.279781e-35
 buffers\\buffer-tojson.js len=10 n=10000                                                                                                           -50.51 %        *** 4.138969e-30
 buffers\\buffer-tojson.js len=256 n=10000                                                                                                           -6.61 %        *** 1.909075e-12
 buffers\\buffer-tojson.js len=4096 n=10000                                                                                                           0.61 %            3.305055e-01
 buffers\\buffer-tostring.js n=10000000 len=0 arg="false"                                                                                           -45.06 %        *** 1.052493e-64
 buffers\\buffer-tostring.js n=10000000 len=0 arg="true"                                                                                            141.33 %        *** 2.570761e-49
 buffers\\buffer-tostring.js n=10000000 len=1 arg="false"                                                                                           -29.80 %        *** 1.295265e-36
 buffers\\buffer-tostring.js n=10000000 len=1 arg="true"                                                                                            -23.91 %        *** 5.613356e-50
 buffers\\buffer-tostring.js n=10000000 len=1024 arg="false"                                                                                        -11.89 %        *** 1.852139e-43
 buffers\\buffer-tostring.js n=10000000 len=1024 arg="true"                                                                                          -7.67 %        *** 1.280761e-22
 buffers\\buffer-tostring.js n=10000000 len=64 arg="false"                                                                                          -32.36 %        *** 3.080627e-63
 buffers\\buffer-tostring.js n=10000000 len=64 arg="true"                                                                                           -23.21 %        *** 1.418203e-37
 buffers\\buffer-write.js millions=1 type="DoubleBE" buffer="fast" noAssert="false"                                                                 -43.56 %        *** 1.585645e-31
 buffers\\buffer-write.js millions=1 type="DoubleBE" buffer="fast" noAssert="true"                                                                  -44.91 %        *** 3.569385e-44
 buffers\\buffer-write.js millions=1 type="DoubleBE" buffer="slow" noAssert="false"                                                                 -44.11 %        *** 1.041960e-42
 buffers\\buffer-write.js millions=1 type="DoubleBE" buffer="slow" noAssert="true"                                                                  -43.94 %        *** 1.257416e-34
 buffers\\buffer-write.js millions=1 type="DoubleLE" buffer="fast" noAssert="false"                                                                 -39.65 %        *** 1.140142e-82
 buffers\\buffer-write.js millions=1 type="DoubleLE" buffer="fast" noAssert="true"                                                                  -42.72 %        *** 1.151006e-80
 buffers\\buffer-write.js millions=1 type="DoubleLE" buffer="slow" noAssert="false"                                                                 -39.74 %        *** 3.682974e-75
 buffers\\buffer-write.js millions=1 type="DoubleLE" buffer="slow" noAssert="true"                                                                  -42.39 %        *** 1.113374e-74
 buffers\\buffer-write.js millions=1 type="FloatBE" buffer="fast" noAssert="false"                                                                  -41.31 %        *** 8.648892e-40
 buffers\\buffer-write.js millions=1 type="FloatBE" buffer="fast" noAssert="true"                                                                   -41.94 %        *** 1.885928e-37
 buffers\\buffer-write.js millions=1 type="FloatBE" buffer="slow" noAssert="false"                                                                  -40.38 %        *** 6.572863e-39
 buffers\\buffer-write.js millions=1 type="FloatBE" buffer="slow" noAssert="true"                                                                   -44.10 %        *** 7.293289e-41
 buffers\\buffer-write.js millions=1 type="FloatLE" buffer="fast" noAssert="false"                                                                  -40.11 %        *** 1.285867e-38
 buffers\\buffer-write.js millions=1 type="FloatLE" buffer="fast" noAssert="true"                                                                   -41.97 %        *** 3.338780e-27
 buffers\\buffer-write.js millions=1 type="FloatLE" buffer="slow" noAssert="false"                                                                  -40.85 %        *** 1.234396e-37
 buffers\\buffer-write.js millions=1 type="FloatLE" buffer="slow" noAssert="true"                                                                   -42.77 %        *** 8.299756e-37
 buffers\\buffer-write.js millions=1 type="Int16BE" buffer="fast" noAssert="false"                                                                   12.51 %        *** 1.082288e-32
 buffers\\buffer-write.js millions=1 type="Int16BE" buffer="fast" noAssert="true"                                                                   -38.73 %        *** 3.306965e-39
 buffers\\buffer-write.js millions=1 type="Int16BE" buffer="slow" noAssert="false"                                                                   12.64 %        *** 5.858414e-26
 buffers\\buffer-write.js millions=1 type="Int16BE" buffer="slow" noAssert="true"                                                                   -38.80 %        *** 2.644936e-46
 buffers\\buffer-write.js millions=1 type="Int16LE" buffer="fast" noAssert="false"                                                                   13.20 %        *** 3.046712e-36
 buffers\\buffer-write.js millions=1 type="Int16LE" buffer="fast" noAssert="true"                                                                   -42.88 %        *** 2.418837e-43
 buffers\\buffer-write.js millions=1 type="Int16LE" buffer="slow" noAssert="false"                                                                   13.35 %        *** 5.381653e-33
 buffers\\buffer-write.js millions=1 type="Int16LE" buffer="slow" noAssert="true"                                                                   -43.64 %        *** 2.124825e-56
 buffers\\buffer-write.js millions=1 type="Int32BE" buffer="fast" noAssert="false"                                                                    0.68 %            1.443934e-01
 buffers\\buffer-write.js millions=1 type="Int32BE" buffer="fast" noAssert="true"                                                                   -39.90 %        *** 7.142140e-40
 buffers\\buffer-write.js millions=1 type="Int32BE" buffer="slow" noAssert="false"                                                                    1.64 %        *** 2.493676e-06
 buffers\\buffer-write.js millions=1 type="Int32BE" buffer="slow" noAssert="true"                                                                   -40.22 %        *** 5.057077e-47
 buffers\\buffer-write.js millions=1 type="Int32LE" buffer="fast" noAssert="false"                                                                    2.51 %        *** 4.209786e-08
 buffers\\buffer-write.js millions=1 type="Int32LE" buffer="fast" noAssert="true"                                                                   -44.77 %        *** 7.731343e-32
 buffers\\buffer-write.js millions=1 type="Int32LE" buffer="slow" noAssert="false"                                                                    1.90 %        *** 6.013827e-09
 buffers\\buffer-write.js millions=1 type="Int32LE" buffer="slow" noAssert="true"                                                                   -44.69 %        *** 1.473504e-38
 buffers\\buffer-write.js millions=1 type="Int8" buffer="fast" noAssert="false"                                                                       8.96 %        *** 1.390186e-25
 buffers\\buffer-write.js millions=1 type="Int8" buffer="fast" noAssert="true"                                                                      -43.46 %        *** 6.151087e-60
 buffers\\buffer-write.js millions=1 type="Int8" buffer="slow" noAssert="false"                                                                       8.77 %        *** 3.912871e-31
 buffers\\buffer-write.js millions=1 type="Int8" buffer="slow" noAssert="true"                                                                      -42.49 %        *** 4.625293e-20
 buffers\\buffer-write.js millions=1 type="UInt16BE" buffer="fast" noAssert="false"                                                                  15.93 %        *** 1.920343e-40
 buffers\\buffer-write.js millions=1 type="UInt16BE" buffer="fast" noAssert="true"                                                                  -37.95 %        *** 2.985032e-28
 buffers\\buffer-write.js millions=1 type="UInt16BE" buffer="slow" noAssert="false"                                                                  15.93 %        *** 1.402500e-43
 buffers\\buffer-write.js millions=1 type="UInt16BE" buffer="slow" noAssert="true"                                                                  -38.79 %        *** 1.025692e-57
 buffers\\buffer-write.js millions=1 type="UInt16LE" buffer="fast" noAssert="false"                                                                  12.50 %        *** 2.898478e-33
 buffers\\buffer-write.js millions=1 type="UInt16LE" buffer="fast" noAssert="true"                                                                  -43.70 %        *** 2.854414e-55
 buffers\\buffer-write.js millions=1 type="UInt16LE" buffer="slow" noAssert="false"                                                                  12.86 %        *** 6.317302e-42
 buffers\\buffer-write.js millions=1 type="UInt16LE" buffer="slow" noAssert="true"                                                                  -43.15 %        *** 4.572356e-42
 buffers\\buffer-write.js millions=1 type="UInt32BE" buffer="fast" noAssert="false"                                                                   5.89 %        *** 1.182524e-25
 buffers\\buffer-write.js millions=1 type="UInt32BE" buffer="fast" noAssert="true"                                                                  -40.05 %        *** 1.608055e-52
 buffers\\buffer-write.js millions=1 type="UInt32BE" buffer="slow" noAssert="false"                                                                   5.68 %        *** 2.005348e-24
 buffers\\buffer-write.js millions=1 type="UInt32BE" buffer="slow" noAssert="true"                                                                  -40.09 %        *** 2.130559e-44
 buffers\\buffer-write.js millions=1 type="UInt32LE" buffer="fast" noAssert="false"                                                                   5.20 %        *** 3.130693e-19
 buffers\\buffer-write.js millions=1 type="UInt32LE" buffer="fast" noAssert="true"                                                                  -40.95 %        *** 4.726284e-60
 buffers\\buffer-write.js millions=1 type="UInt32LE" buffer="slow" noAssert="false"                                                                   5.93 %        *** 2.668763e-20
 buffers\\buffer-write.js millions=1 type="UInt32LE" buffer="slow" noAssert="true"                                                                  -40.30 %        *** 1.091369e-32
 buffers\\buffer-write.js millions=1 type="UInt8" buffer="fast" noAssert="false"                                                                      8.60 %        *** 2.492144e-29
 buffers\\buffer-write.js millions=1 type="UInt8" buffer="fast" noAssert="true"                                                                     -41.73 %        *** 1.405204e-31
 buffers\\buffer-write.js millions=1 type="UInt8" buffer="slow" noAssert="false"                                                                      9.32 %        *** 4.601417e-22
 buffers\\buffer-write.js millions=1 type="UInt8" buffer="slow" noAssert="true"                                                                     -42.55 %        *** 2.019819e-31
 buffers\\buffer_zero.js type="buffer" n=1024                                                                                                         2.44 %        *** 3.511559e-04
 buffers\\buffer_zero.js type="string" n=1024                                                                                                         8.90 %        *** 1.325879e-13
 buffers\\dataview-set.js millions=1 type="Float32BE"                                                                                                -4.65 %        *** 1.682569e-11
 buffers\\dataview-set.js millions=1 type="Float32LE"                                                                                                -6.15 %        *** 1.081206e-21
 buffers\\dataview-set.js millions=1 type="Float64BE"                                                                                                -6.72 %        *** 5.129692e-21
 buffers\\dataview-set.js millions=1 type="Float64LE"                                                                                                -7.83 %        *** 4.473849e-17
 buffers\\dataview-set.js millions=1 type="Int16BE"                                                                                                  -4.64 %         ** 1.451298e-03
 buffers\\dataview-set.js millions=1 type="Int16LE"                                                                                                  -3.09 %        *** 4.174781e-04
 buffers\\dataview-set.js millions=1 type="Int32BE"                                                                                                  -3.69 %         ** 1.222692e-03
 buffers\\dataview-set.js millions=1 type="Int32LE"                                                                                                  -5.41 %        *** 6.345715e-07
 buffers\\dataview-set.js millions=1 type="Int8"                                                                                                     -6.33 %        *** 1.863074e-07
 buffers\\dataview-set.js millions=1 type="Uint16BE"                                                                                                 -7.71 %        *** 4.916663e-08
 buffers\\dataview-set.js millions=1 type="Uint16LE"                                                                                                 -9.33 %        *** 2.014695e-15
 buffers\\dataview-set.js millions=1 type="Uint32BE"                                                                                                 29.27 %        *** 6.652924e-54
 buffers\\dataview-set.js millions=1 type="Uint32LE"                                                                                                 33.39 %        *** 8.781109e-55
 buffers\\dataview-set.js millions=1 type="Uint8"                                                                                                    -4.19 %        *** 2.561106e-04

A gist with the same data.

[mscdex]

@vsemozhetbyt You can reduce the iteration count n (and/or the number of runs if the results don't seem to vary too wildly) if a single run takes too long. I would make sure a single run executes for at least 5-10 seconds or so to give V8 plenty of time to properly optimize code and whatnot.

[vsemozhetbyt]

@mscdex If I get it right, the problem is that a nominal 'one run', as the progress bar and the compare.js have it, includes many real runs with different config variants, from 2 up to more than 100. These real runs can last a very different amount of time with the same n parameter, from a second up to several minutes. If we try to keep all these real runs near at least 5-10 seconds, the real runs with maximum time span get a huge time span.

For example, I've reduced n for buffer-swap.js from 5e7 to 1e6. The whole set of 60 nominal runs has lasted ~ 3 hours, with one nominal run ~ 3 min. This benchmark has 66 config variants, some of them have lasted near 1 second, some of them have lasted near 15-20 seconds. To balance these cases, the n should be changed separately and conditionally for each config variant. Unfortunately, this can be achieved either by editing the code or by many complicated CLI arguments sets and separate runs.

[vsemozhetbyt]

buffer-swap.js with --set n=1e6:

                                                                            improvement confidence      p.value
 buffers\\buffer-swap.js n=1000000 len=1024 method="swap16" aligned="false"      0.36 %        *** 6.076393e-18
 buffers\\buffer-swap.js n=1000000 len=1024 method="swap16" aligned="true"       1.10 %        *** 1.359542e-22
 buffers\\buffer-swap.js n=1000000 len=1024 method="swap32" aligned="false"      0.07 %            1.796922e-01
 buffers\\buffer-swap.js n=1000000 len=1024 method="swap32" aligned="true"       0.22 %          * 1.744881e-02
 buffers\\buffer-swap.js n=1000000 len=1024 method="swap64" aligned="false"      0.24 %        *** 1.566726e-07
 buffers\\buffer-swap.js n=1000000 len=1024 method="swap64" aligned="true"      -0.04 %            7.858086e-01
 buffers\\buffer-swap.js n=1000000 len=128 method="swap16" aligned="false"       1.96 %        *** 2.119761e-08
 buffers\\buffer-swap.js n=1000000 len=128 method="swap16" aligned="true"        3.60 %        *** 8.102858e-24
 buffers\\buffer-swap.js n=1000000 len=128 method="swap32" aligned="false"     -25.83 %        *** 2.334289e-88
 buffers\\buffer-swap.js n=1000000 len=128 method="swap32" aligned="true"      -28.18 %        *** 9.633524e-92
 buffers\\buffer-swap.js n=1000000 len=128 method="swap64" aligned="false"     -32.50 %        *** 2.203248e-71
 buffers\\buffer-swap.js n=1000000 len=128 method="swap64" aligned="true"      -29.72 %        *** 5.921971e-96
 buffers\\buffer-swap.js n=1000000 len=1536 method="swap16" aligned="false"      0.21 %        *** 2.326170e-04
 buffers\\buffer-swap.js n=1000000 len=1536 method="swap16" aligned="true"       0.92 %        *** 2.883013e-20
 buffers\\buffer-swap.js n=1000000 len=1536 method="swap32" aligned="false"      0.10 %        *** 8.005634e-06
 buffers\\buffer-swap.js n=1000000 len=1536 method="swap32" aligned="true"       0.14 %            7.896609e-02
 buffers\\buffer-swap.js n=1000000 len=1536 method="swap64" aligned="false"      0.09 %            9.037307e-02
 buffers\\buffer-swap.js n=1000000 len=1536 method="swap64" aligned="true"       0.21 %            3.514098e-01
 buffers\\buffer-swap.js n=1000000 len=2056 method="swap16" aligned="false"      0.17 %        *** 3.248787e-04
 buffers\\buffer-swap.js n=1000000 len=2056 method="swap16" aligned="true"       0.55 %        *** 1.625691e-10
 buffers\\buffer-swap.js n=1000000 len=2056 method="swap32" aligned="false"      0.02 %            1.648908e-01
 buffers\\buffer-swap.js n=1000000 len=2056 method="swap32" aligned="true"       0.13 %          * 3.592004e-02
 buffers\\buffer-swap.js n=1000000 len=2056 method="swap64" aligned="false"     -0.08 %            1.680445e-01
 buffers\\buffer-swap.js n=1000000 len=2056 method="swap64" aligned="true"       0.13 %            8.412957e-02
 buffers\\buffer-swap.js n=1000000 len=256 method="swap16" aligned="false"       1.14 %        *** 2.298617e-15
 buffers\\buffer-swap.js n=1000000 len=256 method="swap16" aligned="true"        2.35 %        *** 8.848386e-23
 buffers\\buffer-swap.js n=1000000 len=256 method="swap32" aligned="false"       0.51 %          * 2.855728e-02
 buffers\\buffer-swap.js n=1000000 len=256 method="swap32" aligned="true"        0.31 %          * 4.837458e-02
 buffers\\buffer-swap.js n=1000000 len=256 method="swap64" aligned="false"       0.70 %        *** 1.187119e-10
 buffers\\buffer-swap.js n=1000000 len=256 method="swap64" aligned="true"        0.03 %            8.377633e-01
 buffers\\buffer-swap.js n=1000000 len=4096 method="swap16" aligned="false"      0.03 %            2.168347e-01
 buffers\\buffer-swap.js n=1000000 len=4096 method="swap16" aligned="true"       0.27 %        *** 5.990335e-08
 buffers\\buffer-swap.js n=1000000 len=4096 method="swap32" aligned="false"      0.03 %            3.267018e-01
 buffers\\buffer-swap.js n=1000000 len=4096 method="swap32" aligned="true"      -0.05 %            7.015377e-01
 buffers\\buffer-swap.js n=1000000 len=4096 method="swap64" aligned="false"     -0.23 %            1.504769e-01
 buffers\\buffer-swap.js n=1000000 len=4096 method="swap64" aligned="true"      -0.18 %            7.870197e-02
 buffers\\buffer-swap.js n=1000000 len=512 method="swap16" aligned="false"       0.57 %        *** 4.245723e-15
 buffers\\buffer-swap.js n=1000000 len=512 method="swap16" aligned="true"        1.80 %        *** 3.992138e-20
 buffers\\buffer-swap.js n=1000000 len=512 method="swap32" aligned="false"       0.35 %        *** 6.259493e-09
 buffers\\buffer-swap.js n=1000000 len=512 method="swap32" aligned="true"        0.42 %         ** 1.212643e-03
 buffers\\buffer-swap.js n=1000000 len=512 method="swap64" aligned="false"       0.52 %        *** 2.336598e-16
 buffers\\buffer-swap.js n=1000000 len=512 method="swap64" aligned="true"       -0.04 %            7.897691e-01
 buffers\\buffer-swap.js n=1000000 len=64 method="swap16" aligned="false"      -11.63 %        *** 1.715831e-70
 buffers\\buffer-swap.js n=1000000 len=64 method="swap16" aligned="true"       -11.28 %        *** 2.934296e-46
 buffers\\buffer-swap.js n=1000000 len=64 method="swap32" aligned="false"      -22.73 %        *** 6.453671e-79
 buffers\\buffer-swap.js n=1000000 len=64 method="swap32" aligned="true"       -23.37 %        *** 3.179763e-71
 buffers\\buffer-swap.js n=1000000 len=64 method="swap64" aligned="false"      -26.91 %        *** 1.133643e-31
 buffers\\buffer-swap.js n=1000000 len=64 method="swap64" aligned="true"       -24.71 %        *** 1.203672e-29
 buffers\\buffer-swap.js n=1000000 len=768 method="swap16" aligned="false"       0.38 %        *** 5.071203e-12
 buffers\\buffer-swap.js n=1000000 len=768 method="swap16" aligned="true"        1.18 %        *** 2.312994e-23
 buffers\\buffer-swap.js n=1000000 len=768 method="swap32" aligned="false"       0.17 %         ** 2.755085e-03
 buffers\\buffer-swap.js n=1000000 len=768 method="swap32" aligned="true"        0.13 %            3.430058e-01
 buffers\\buffer-swap.js n=1000000 len=768 method="swap64" aligned="false"       0.44 %        *** 4.743284e-04
 buffers\\buffer-swap.js n=1000000 len=768 method="swap64" aligned="true"       -0.03 %            8.388090e-01
 buffers\\buffer-swap.js n=1000000 len=8 method="swap16" aligned="false"         6.06 %        *** 2.951182e-30
 buffers\\buffer-swap.js n=1000000 len=8 method="swap16" aligned="true"          5.74 %        *** 3.316930e-21
 buffers\\buffer-swap.js n=1000000 len=8 method="swap32" aligned="false"         3.50 %        *** 1.244331e-22
 buffers\\buffer-swap.js n=1000000 len=8 method="swap32" aligned="true"          1.72 %        *** 1.879290e-11
 buffers\\buffer-swap.js n=1000000 len=8 method="swap64" aligned="false"         0.68 %          * 3.477764e-02
 buffers\\buffer-swap.js n=1000000 len=8 method="swap64" aligned="true"          0.10 %            8.185927e-01
 buffers\\buffer-swap.js n=1000000 len=8192 method="swap16" aligned="false"      0.02 %            1.425613e-01
 buffers\\buffer-swap.js n=1000000 len=8192 method="swap16" aligned="true"       0.18 %        *** 1.916646e-08
 buffers\\buffer-swap.js n=1000000 len=8192 method="swap32" aligned="false"     -0.02 %            2.420096e-01
 buffers\\buffer-swap.js n=1000000 len=8192 method="swap32" aligned="true"       0.11 %          * 2.388254e-02
 buffers\\buffer-swap.js n=1000000 len=8192 method="swap64" aligned="false"     -0.17 %         ** 3.838764e-03
 buffers\\buffer-swap.js n=1000000 len=8192 method="swap64" aligned="true"       0.02 %            6.347701e-01

[vsemozhetbyt]

child_process:

                                                                                  improvement confidence      p.value
 child_process\\child-process-exec-stdout.js dur=5 len=1024                           -0.90 %            4.373815e-01
 child_process\\child-process-exec-stdout.js dur=5 len=256                             0.23 %            8.935467e-01
 child_process\\child-process-exec-stdout.js dur=5 len=4096                            0.62 %            6.591330e-01
 child_process\\child-process-exec-stdout.js dur=5 len=64                             -1.87 %            3.482599e-01
 child_process\\child-process-params.js params=1 methodName="exec" n=1000             -4.63 %        *** 5.123714e-11
 child_process\\child-process-params.js params=1 methodName="execFile" n=1000         -3.92 %        *** 2.644723e-12
 child_process\\child-process-params.js params=1 methodName="execFileSync" n=1000     -0.28 %            7.107140e-01
 child_process\\child-process-params.js params=1 methodName="execSync" n=1000         -0.21 %            4.051633e-01
 child_process\\child-process-params.js params=1 methodName="spawn" n=1000            -4.01 %        *** 1.536730e-14
 child_process\\child-process-params.js params=1 methodName="spawnSync" n=1000        -0.22 %            7.796821e-01
 child_process\\child-process-params.js params=2 methodName="exec" n=1000             -4.42 %        *** 5.623094e-16
 child_process\\child-process-params.js params=2 methodName="execFile" n=1000         -3.40 %        *** 1.986012e-09
 child_process\\child-process-params.js params=2 methodName="execFileSync" n=1000      0.07 %            9.104965e-01
 child_process\\child-process-params.js params=2 methodName="execSync" n=1000         -0.09 %            4.823520e-01
 child_process\\child-process-params.js params=2 methodName="spawn" n=1000            -3.98 %        *** 7.050357e-13
 child_process\\child-process-params.js params=2 methodName="spawnSync" n=1000         1.04 %            2.596032e-01
 child_process\\child-process-params.js params=3 methodName="exec" n=1000             -5.15 %        *** 4.912272e-15
 child_process\\child-process-params.js params=3 methodName="execFile" n=1000         -4.78 %        *** 2.814372e-17
 child_process\\child-process-params.js params=3 methodName="execFileSync" n=1000      0.06 %            9.181210e-01
 child_process\\child-process-params.js params=3 methodName="spawn" n=1000            -3.86 %        *** 1.507486e-10
 child_process\\child-process-params.js params=3 methodName="spawnSync" n=1000         1.02 %            2.644717e-01
 child_process\\child-process-params.js params=4 methodName="execFile" n=1000         -3.90 %        *** 7.927832e-17
 child_process\\child-process-read-ipc.js dur=5 len=1024                              -0.02 %            9.396622e-01
 child_process\\child-process-read-ipc.js dur=5 len=1048576                            1.03 %          * 3.282735e-02
 child_process\\child-process-read-ipc.js dur=5 len=16384                             -0.27 %        *** 5.423084e-04
 child_process\\child-process-read-ipc.js dur=5 len=16777216                           0.26 %            2.500390e-01
 child_process\\child-process-read-ipc.js dur=5 len=256                               -0.70 %        *** 7.789173e-04
 child_process\\child-process-read-ipc.js dur=5 len=4096                              -0.21 %            9.370554e-02
 child_process\\child-process-read-ipc.js dur=5 len=64                                -0.68 %         ** 2.257675e-03
 child_process\\child-process-read-ipc.js dur=5 len=65536                              0.91 %        *** 3.971267e-04
 child_process\\child-process-read.js dur=5 len=1024                                   0.83 %         ** 1.021766e-03
 child_process\\child-process-read.js dur=5 len=256                                   -1.70 %            4.431098e-01
 child_process\\child-process-read.js dur=5 len=4096                                  -0.54 %            5.921539e-01
 child_process\\child-process-read.js dur=5 len=64                                     0.84 %        *** 6.748565e-05
 child_process\\spawn-echo.js thousands=1                                             -0.68 %            3.306275e-01