Even faster C.Run by using no reflect at all in common cases #165
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rogpeppe
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Aug 1, 2023
This is an alternative to PRs frankban#160 and frankban#165. It's essentially the same as PR frankban#165 except that it uses generics to reduce the amount of duplicated code. Instead of just amortizing the checking of the type, when the argument type of the function passed to `Run` is known, it bypasses the reflect-based code altogether. We don't bother implementing the optimization on pre-generics Go versions because those are end-of-lifetime anyway. I've added an implementation-independent benchmark. ``` goos: linux goarch: amd64 pkg: github.com/frankban/quicktest cpu: Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz │ base │ thisPR │ │ sec/op │ sec/op vs base │ CNewAndRunWithCustomType-8 1077.5n ± 5% 136.8n ± 6% -87.30% (p=0.002 n=6) CRunWithCustomType-8 1035.00n ± 11% 66.43n ± 3% -93.58% (p=0.002 n=6) geomean 1.056µ 95.33n -90.97% ```
rogpeppe
added a commit
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that referenced
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Aug 1, 2023
This is an alternative to PRs frankban#160 and frankban#165. It's essentially the same as PR frankban#165 except that it uses generics to reduce the amount of duplicated code. Instead of just amortizing the checking of the type, when the argument type of the function passed to `Run` is known, it bypasses the reflect-based code altogether. We don't bother implementing the optimization on pre-generics Go versions because those are end-of-lifetime anyway. I've added an implementation-independent benchmark. ``` goos: linux goarch: amd64 pkg: github.com/frankban/quicktest cpu: Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz │ base │ thisPR │ │ sec/op │ sec/op vs base │ CNewAndRunWithCustomType-8 1077.5n ± 5% 136.8n ± 6% -87.30% (p=0.002 n=6) CRunWithCustomType-8 1035.00n ± 11% 66.43n ± 3% -93.58% (p=0.002 n=6) geomean 1.056µ 95.33n -90.97% ```
rogpeppe
reviewed
Aug 2, 2023
quicktest_test.go
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| (*customT)(nil), // a custom form of testing.TB with a non-standard Run method | ||
| } { | ||
| tbt := reflect.TypeOf(tb) | ||
| farg, err := qt.GetRunFuncSignature(tbt) |
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This test isn't great IMHO. Firstly, it tests GetRunFuncSignature which is an internal implementation detail (this module in general tries to test the public API as much as possible to allow later internal refactoring without changing tests). Secondly, GetRunFuncSignature won't even be invoked in most of the above cases, so I'm not sure why this is explicitly testing them.
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I have now removed the commit that added that test.
Extract signature check of the Run method.
In C.Run add shortcuts to completely bypass the use of reflect for the well known cases of Run signatures with either *testing.T, *testing.B or *quicktest.C argument.
Factorize the setup of the qt.C given to the subtest. That setup is now common to the reflect version and the shortcut ones instead of being duplicated.
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I've cleaned the PR:
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In
C.Runbypass check of the signature of theRunmethod ofc.TBfor the common cases (testing.T.Run,testing.B.Run,quicktest.C.Run) by using a type switch.Note: this is an alternative version of #160 and replaces it. The first 2 commits are common.
This serie of patches shows the developement process:
getRunFuncSignaturegetRunFuncSignatureC.Runto add shortcuts for common cases using a type switch