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fs: improve mkdtemp performance for buffer prefix #51078

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merged 1 commit into from Dec 20, 2023
Merged

fs: improve mkdtemp performance for buffer prefix #51078

merged 1 commit into from Dec 20, 2023

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anonrig
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@anonrig anonrig commented Dec 6, 2023 •
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This small PR improves the mkdtempSync performance for buffer inputs by 5%. Basically, we achieve this performance boost because Buffer.concat() is costly, and doing it in C++ is beneficial for performance.

Local benchmarks

❯ node benchmark/compare.js --old ./node-main --new out/Release/node --filter mkdtempSync fs > fs.csv && node-benchmark-compare fs.csv
[00:00:25|% 100| 1/1 files | 60/60 runs | 3/3 configs]: Done
                                                    confidence improvement accuracy (*)   (**)   (***)
fs/bench-mkdtempSync.js n=1000 type='invalid'                      1.64 %       ±6.96% ±9.28% ±12.11%
fs/bench-mkdtempSync.js n=1000 type='valid-buffer'        ***      5.52 %       ±2.97% ±3.95%  ±5.14%
fs/bench-mkdtempSync.js n=1000 type='valid-string'                -1.40 %       ±3.73% ±4.96%  ±6.46%

Be aware that when doing many comparisons the risk of a false-positive result increases.
In this case, there are 3 comparisons, you can thus expect the following amount of false-positive results:
  0.15 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.03 false positives, when considering a   1% risk acceptance (**, ***),
  0.00 false positives, when considering a 0.1% risk acceptance (***)

Benchmark CI

https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1483/

                                                   confidence improvement accuracy (*)   (**)  (***)
fs/bench-mkdtempSync.js n=1000 type='invalid'                     -2.32 %       ±2.97% ±3.97% ±5.19%
fs/bench-mkdtempSync.js n=1000 type='valid-buffer'        ***     21.88 %       ±2.87% ±3.84% ±5.02%
fs/bench-mkdtempSync.js n=1000 type='valid-string'                -1.53 %       ±4.60% ±6.13% ±8.00%

@anonrig anonrig added fs Issues and PRs related to the fs subsystem / file system. performance Issues and PRs related to the performance of Node.js. labels Dec 6, 2023
@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. needs-ci PRs that need a full CI run. labels Dec 6, 2023
@anonrig anonrig added the request-ci Add this label to start a Jenkins CI on a PR. label Dec 6, 2023
@github-actions github-actions bot removed the request-ci Add this label to start a Jenkins CI on a PR. label Dec 6, 2023
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CI: https://ci.nodejs.org/job/node-test-pull-request/56140/

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anonrig commented Dec 7, 2023

cc @nodejs/performance appreciate any reviews!

@anonrig anonrig added the review wanted PRs that need reviews. label Dec 7, 2023
MarshallOfSound
MarshallOfSound reviewed Dec 7, 2023
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H4ad
H4ad approved these changes Dec 7, 2023
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LGTM, with some minor comments.

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mcollina
mcollina approved these changes Dec 7, 2023
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lgtm

allthingsasync
allthingsasync reviewed Dec 8, 2023
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jasnell
jasnell reviewed Dec 9, 2023
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@anonrig anonrig added the request-ci Add this label to start a Jenkins CI on a PR. label Dec 15, 2023
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CI: https://ci.nodejs.org/job/node-test-pull-request/56301/

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CI: https://ci.nodejs.org/job/node-test-pull-request/56316/

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CI: https://ci.nodejs.org/job/node-test-pull-request/56390/

@anonrig anonrig added the commit-queue Add this label to land a pull request using GitHub Actions. label Dec 20, 2023
@nodejs-github-bot nodejs-github-bot removed the commit-queue Add this label to land a pull request using GitHub Actions. label Dec 20, 2023
@nodejs-github-bot nodejs-github-bot merged commit 202c872 into nodejs:main Dec 20, 2023
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RafaelGSS pushed a commit that referenced this pull request Jan 2, 2024
@anonrig @RafaelGSS
fs: improve mkdtemp performance for buffer prefix
7421467 
PR-URL: #51078
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
@RafaelGSS RafaelGSS mentioned this pull request Jan 2, 2024
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richardlau pushed a commit that referenced this pull request Mar 25, 2024
@anonrig @richardlau
fs: improve mkdtemp performance for buffer prefix
65df2c6 
PR-URL: #51078
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
@richardlau richardlau mentioned this pull request Mar 25, 2024
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