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buffer: improve equals() performance #29199

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mscdex
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@mscdex mscdex commented Aug 19, 2019

Results:

                                                            confidence improvement accuracy (*)   (**)  (***)
 buffers/buffer-equals.js n=10000000 difflen='false' size=0          ***    520.06 %       ±1.38%  ±1.85%   ±2.44%
 buffers/buffer-equals.js n=10000000 difflen='true' size=0           ***    674.98 %       ±2.18%  ±2.92%   ±3.85%
 buffers/buffer-equals.js n=10000000 difflen='true' size=16          ***    874.14 %       ±5.80%  ±7.81%  ±10.36%
 buffers/buffer-equals.js n=10000000 difflen='true' size=512         ***   1072.12 %       ±6.67%  ±8.98%  ±11.92%
 buffers/buffer-equals.js n=10000000 difflen='true' size=4096        ***   2569.30 %       ±4.33%  ±5.83%   ±7.74%
 buffers/buffer-equals.js n=4000000 difflen='true' size=16386        ***   7526.00 %      ±32.02% ±43.15%  ±57.28%

I'm not sure offhand what's up with the large variance for size=16386, especially since trying the same n value as the other cases actually resulted in an even larger variance. Anyway, the actual numbers don't really matter so much as the trend.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

@mscdex mscdex added buffer Issues and PRs related to the buffer subsystem. performance Issues and PRs related to the performance of Node.js. labels Aug 19, 2019
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CI: https://ci.nodejs.org/job/node-test-pull-request/25077/

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BridgeAR
BridgeAR reviewed Aug 19, 2019
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benchmark/buffers/buffer-equals.js Outdated
const common = require('../common.js');

const bench = common.createBenchmark(main, {
size: [0, 16, 512, 4096, 16386],
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It should be sufficient to just keep e.g., 0, 512 and 16386. The other options are just intermediate steps.

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FWIW I copied this from buffer-compare.js, does that mean that should be changed as well?

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That would IMO be ideal 👍

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Trott commented Aug 21, 2019

Need to add difflen to test/benchmark/test-benchmark-buffer so that it still passes?

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Trott commented Aug 21, 2019

Need to add difflen to test/benchmark/test-benchmark-buffer so that it still passes?

Confirmed. This is needed. I tried to add a fixup commit but I don't have permission to the branch.

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LGTM but needs a change to avoid breaking test-benchmark-buffer

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mscdex commented Aug 21, 2019

Shouldn't the test fail if it was breaking?

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Trott commented Aug 21, 2019 •
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Shouldn't the test fail if it was breaking?

benchmark tests only run nightly in CI and only if you run make test-all locally. I'd be +1 on running them a bit more widely, but we scaled it back when people complained about tests taking too long and benchmark test in particular being unreliable in certain environments, IIRC.

Trott
Trott reviewed Aug 21, 2019
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test/benchmark/test-benchmark-buffer.js Outdated
@@ -26,6 +26,7 @@ runBenchmark('buffers',
'source=array',
'type=',
'value=0',
'withTotalLength=0'
'withTotalLength=0',
'difflen=false'
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Super minor optional nit: The rest of the options are alphabetized. Can this go after line 14 intstead?

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Trott approved these changes Aug 21, 2019
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LGTM with or without my additional optional nit

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Trott commented Aug 22, 2019

Landed in f0c8898

@Trott Trott closed this Aug 22, 2019
Trott pushed a commit to Trott/io.js that referenced this pull request Aug 22, 2019
@mscdex @Trott
buffer: improve equals() performance
f0c8898 
PR-URL: nodejs#29199
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Yongsheng Zhang <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
@mscdex mscdex deleted the buffer-equals-perf branch August 22, 2019 12:51
BridgeAR pushed a commit that referenced this pull request Sep 3, 2019
@mscdex @BridgeAR
buffer: improve equals() performance
35bca31 
PR-URL: #29199
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Yongsheng Zhang <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Rich Trott <[email protected]>
@BridgeAR BridgeAR mentioned this pull request Sep 3, 2019
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@BridgeAR BridgeAR BridgeAR approved these changes

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@lpinca lpinca lpinca approved these changes

@Trott Trott Trott approved these changes

@jasnell jasnell jasnell approved these changes

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