APFS fsevents

[adambowles]

• Version: 8.6.0
• Platform: macOS 10.13 High Sierra
• Subsystem:

> node scripts/test.js

2017-09-29 14:14 node[35183] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
2017-09-29 14:14 node[35183] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
events.js:182
      throw er; // Unhandled 'error' event
      ^

Error: Error watching file for changes: EMFILE
    at _errnoException (util.js:1019:11)
    at FSEvent.FSWatcher._handle.onchange (fs.js:1360:9)

Jest failing to watch files on APFS filesystem

[cjihrig]

Does increasing the maximum number of file descriptors (ulimit -n) make any difference?

[adambowles]

> ulimit -n
256

Then same error reported on node scripts/test.js

[evanlucas]

You will probably need to set maxfiles via launchctl before calling ulimit -n. Something like:

$ sudo launchctl limit maxfiles 2000 2000 && ulimit -n 2000
$ ulimit -n

should show 2000. IIRC the default max fds on macOS is 256

[bnoordhuis]

Quite possibly related to libuv/libuv#387.

[bnoordhuis]

@adambowles Can you check if libuv/libuv#1572 makes a difference?

curl -L https://github.com/libuv/libuv/pull/1572.patch | git am --directory=deps/uv to apply, followed by ./configure && make -j8 to (re)build.

[adambowles]

I'm not sure where I should be applying that patch @bnoordhuis

[bnoordhuis]

To this repo.

[adambowles]

Okay, I've patched and building atm

[adambowles]

> ./node -v
v9.0.0-pre
> cd ../project && ../node/node scripts/test.js
2017-10-02 11:38 node[63244] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
2017-10-02 11:38 node[63244] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22)
events.js:182
      throw er; // Unhandled 'error' event
      ^

Error: Error watching file for changes: EMFILE
    at _errnoException (util.js:1021:13)
    at FSEvent.FSWatcher._handle.onchange (fs.js:1369:9)

So yeah, same error output

[bnoordhuis]

Okay, thanks. Errno -22 is EINVAL but it's anybody's guess why that happens.

It's happening inside FSEvents.framework but whether that's because of a bug in node/libuv or the framework, I can't say (and have no way to reproduce, let alone debug.)