Node: Error.captureStackTrace() performance regression in v7.x

[mrtbld]

• Version: v7.5.0
• Platform: Fedora release 23 (Twenty Three) Linux 4.8.13-100.fc23.x86_64
• Subsystem: errors, v8

Error.captureStackTrace() is about 10 times slower in v7.5.0 than in v6.9.5.

$ nvm use v6.9.5
Now using node v6.9.5 (npm v3.10.10)
$ node -e 'console.time(); for (var i = 10000; i--;) Error.captureStackTrace({}); console.timeEnd()'
undefined: 20.596ms

$ nvm use v7.0.0
Now using node v7.0.0 (npm v3.10.8)
$ node -e 'console.time(); for (var i = 10000; i--;) Error.captureStackTrace({}); console.timeEnd()'
undefined: 143.613ms

$ nvm use v7.5.0
Now using node v7.5.0 (npm v4.1.2)
$ node -e 'console.time(); for (var i = 10000; i--;) Error.captureStackTrace({}); console.timeEnd()'
undefined: 201.507ms

$ grep 'model name' /proc/cpuinfo | head -1
model name: Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz

In particular this impacts bluebird in NODE_ENV=development i.e. when longStackTraces are active.

[bnoordhuis]

Known V8 issue: https://bugs.chromium.org/p/v8/issues/detail?id=5962

Not much we can do except perhaps back-port the fix once it materializes.

[hashseed]

Does this performance regression actually affect anything in production?

[vmarchaud]

@hashseed Module that instrument production code use it to retrieve userspace callsite (opbeat for example)

[hashseed]

I see. Is it possible to subclass Error to achieve the same?

[Trott]

Closing because v7.x is EOL. Please comment or re-open if this should remain open. Thanks!

[alangpierce]

@Trott this is still an issue on node 8. This microbenchmark takes about 3 seconds on node 8.2.1 and about 370ms on node 6.11.1:

for (let i = 0; i < 100000; i++) {
  Error.captureStackTrace({});
}

That said, the issue was recently fixed in V8: https://bugs.chromium.org/p/v8/issues/detail?id=5962

So this will be fixed whenever node pulls in the fix.

[BridgeAR]

This is fixed on master. As soon as v8 6.1 is merged and released (very soon) it is going to be fine again.

I am therefore closing this.