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events: avoid emit() eager deopt #10568

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events: avoid emit() eager deopt #10568

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vhf
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@vhf vhf commented Jan 1, 2017 •
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This commit makes sure EventEmitter.emit() doesn't get deoptimized by V8.
The deopt happens when accessing out of bound indexes of the arguments
object.

This issue has been raised here: #10323
and this specific case might become a more serious performance issue in
upcoming V8 releases.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines
Affected core subsystem(s)
  • events
  • @nodejs/v8

@nodejs-github-bot nodejs-github-bot added events Issues and PRs related to the events subsystem / EventEmitter. lts-watch-v6.x labels Jan 1, 2017
mscdex
mscdex reviewed Jan 1, 2017
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lib/events.js
@@ -148,7 +148,7 @@ EventEmitter.prototype.emit = function emit(type) {

// If there is no 'error' event listener then throw.
if (doError) {
er = arguments[1];
er = arguments.length <= 1 ? undefined : arguments[1];
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I think I'd rather just see an if like:

if (arguments.length > 1)
  er = arguments[1];

since er is undefined by default.

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Right, thanks!

@vhf vhf force-pushed the fix-eventemitter-emit-deopt branch from 843b3d3 to 2c64dd8 Compare January 1, 2017 22:49
@vhf vhf force-pushed the fix-eventemitter-emit-deopt branch from 2c64dd8 to 3d39b08 Compare January 1, 2017 23:17
Trott
Trott reviewed Jan 2, 2017
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benchmark/run.js
@@ -6,7 +6,7 @@ const CLI = require('./_cli.js');

const cli = CLI(`usage: ./node run.js [options] [--] <category> ...
Run each benchmark in the <category> directory a single time, more than one
<categoty> directory can be specified.
<category> directory can be specified.
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This spelling correction seems valid, but unrelated to this PR?

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Yep, unrelated. Would you prefer this PR not to include this correction?

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Given that it's in an entirely different file, I'd prefer that it get its own PR, yeah. (But I wouldn't stop this from being approved over it.)

cjihrig
cjihrig approved these changes Jan 2, 2017
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LGTM. But the typo fix should be a separate commit (same PR is probably OK though).

@vhf
events: avoid emit() eager deopt
91cf369 
This commit makes sure EventEmitter.emit() doesn't get deoptimized by
V8. The deopt happens when accessing out of bound indexes of the
`arguments` object.

This issue has been raised here: nodejs#10323 and this specific case might
become a more serious performance issue in upcoming V8 releases.
@vhf
benchmark: fix typo "categoty" -> "category"
8db2546
@vhf vhf force-pushed the fix-eventemitter-emit-deopt branch from 3d39b08 to 8db2546 Compare January 2, 2017 21:33
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vhf commented Jan 2, 2017

Thanks for your comments. I split the two modifications in two commits.

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cjihrig commented Jan 2, 2017

CI: https://ci.nodejs.org/job/node-test-pull-request/5667/

@mscdex mscdex added the performance Issues and PRs related to the performance of Node.js. label Jan 3, 2017
mhdawson
mhdawson approved these changes Jan 3, 2017
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LGTM

jasnell pushed a commit that referenced this pull request Jan 5, 2017
@vhf @jasnell
events: avoid emit() eager deopt
e52fee5 
This commit makes sure EventEmitter.emit() doesn't get deoptimized by
V8. The deopt happens when accessing out of bound indexes of the
`arguments` object.

This issue has been raised here: #10323 and this specific case might
become a more serious performance issue in upcoming V8 releases.

PR-URL: #10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
jasnell pushed a commit that referenced this pull request Jan 5, 2017
@vhf @jasnell
benchmark: fix typo "categoty" -> "category"
da71d48 
PR-URL: #10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
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jasnell commented Jan 5, 2017 •
edited by MylesBorins
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Landed in e52fee5...da71d48

@jasnell jasnell closed this Jan 5, 2017
@vhf vhf deleted the fix-eventemitter-emit-deopt branch January 8, 2017 23:29
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 18, 2017
@vhf @italoacasas
events: avoid emit() eager deopt
81866a9 
This commit makes sure EventEmitter.emit() doesn't get deoptimized by
V8. The deopt happens when accessing out of bound indexes of the
`arguments` object.

This issue has been raised here: nodejs#10323 and this specific case might
become a more serious performance issue in upcoming V8 releases.

PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 18, 2017
@vhf @italoacasas
benchmark: fix typo "categoty" -> "category"
d28b6d7 
PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 19, 2017
@vhf @italoacasas
events: avoid emit() eager deopt
91e96ab 
This commit makes sure EventEmitter.emit() doesn't get deoptimized by
V8. The deopt happens when accessing out of bound indexes of the
`arguments` object.

This issue has been raised here: nodejs#10323 and this specific case might
become a more serious performance issue in upcoming V8 releases.

PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 19, 2017
@vhf @italoacasas
benchmark: fix typo "categoty" -> "category"
712d305 
PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 24, 2017
@vhf @italoacasas
events: avoid emit() eager deopt
922318e 
This commit makes sure EventEmitter.emit() doesn't get deoptimized by
V8. The deopt happens when accessing out of bound indexes of the
`arguments` object.

This issue has been raised here: nodejs#10323 and this specific case might
become a more serious performance issue in upcoming V8 releases.

PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 24, 2017
@vhf @italoacasas
benchmark: fix typo "categoty" -> "category"
0b7ff76 
PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
@italoacasas italoacasas mentioned this pull request Jan 25, 2017
Closed
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 27, 2017
@vhf @italoacasas
events: avoid emit() eager deopt
5cca693 
This commit makes sure EventEmitter.emit() doesn't get deoptimized by
V8. The deopt happens when accessing out of bound indexes of the
`arguments` object.

This issue has been raised here: nodejs#10323 and this specific case might
become a more serious performance issue in upcoming V8 releases.

PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
italoacasas pushed a commit to italoacasas/node that referenced this pull request Jan 27, 2017
@vhf @italoacasas
benchmark: fix typo "categoty" -> "category"
4f96272 
PR-URL: nodejs#10568
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>
Reviewed-By: Jeremiah Senkpiel <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Michael Dawson <[email protected]>
@italoacasas italoacasas mentioned this pull request Jan 29, 2017
Merged
@vsemozhetbyt vsemozhetbyt mentioned this pull request Feb 1, 2017
Closed
@MylesBorins
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Thoughts re: backport?

@MylesBorins
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ping

@benjamingr
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@MylesBorins this looks pretty simple to backport although not particularly important. Any reason not to?

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@benjamingr want to confirm that there are not potential weird edges... been seeing failures on master due to emit changes

@MylesBorins MylesBorins added baking-for-lts PRs that need to wait before landing in a LTS release. and removed lts-watch-v4.x labels May 8, 2017
@MylesBorins MylesBorins removed the baking-for-lts PRs that need to wait before landing in a LTS release. label Aug 17, 2018
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@Trott Trott Trott left review comments

@mscdex mscdex mscdex left review comments

@mhdawson mhdawson mhdawson approved these changes

@cjihrig cjihrig cjihrig approved these changes

@benjamingr benjamingr benjamingr approved these changes

@Fishrock123 Fishrock123 Fishrock123 approved these changes

@evanlucas evanlucas evanlucas approved these changes

@jasnell jasnell jasnell approved these changes

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