fs: improve error performance of writevSync #50038

IlyasShabi · 2023-10-04T13:37:50Z

Local benchmark:

                                                  confidence improvement accuracy (*)   (**)  (***)
fs/bench-writevSync.js n=100000 type='invalid'        ***     125.24 %       ±2.51%   ±3.34%  ±4.37%
fs/bench-writevSync.js n=100000 type='valid'          ***     -0.26 %        ±3.07%   ±4.10%  ±5.34%

Ref: nodejs/performance#106

IlyasShabi · 2023-10-04T13:39:09Z

Feel free to suggest improvements in the benchmark file

Uzlopak · 2023-10-04T13:56:17Z

Afaik in c++ returning a value is slower than modifying a variable passed as parameter (by ref).

anonrig · 2023-10-04T14:30:29Z

benchmark/fs/bench-writevSync.js

+fs.writeFileSync(path, 'Some content.');
+
+const bench = common.createBenchmark(main, {
+  type: ['valid'],


Please add an invalid type to benchmarks

@anonrig I would appreciate help creating a good bench script for my first PR 🙏

lib/fs.js

anonrig · 2023-10-04T14:31:36Z

src/node_file.cc

              uv_fs_write, fd, *iovs, iovs.length(), pos);
-  } else {  // writeBuffers(fd, chunks, pos, undefined, ctx)
-    CHECK_EQ(argc, 5);
+  } else {
    FSReqWrapSync req_wrap_sync;


This line needs to be updated.

anonrig · 2023-10-04T14:32:21Z

benchmark/fs/bench-writevSync.js

+  bench.start();
+  for (let i = 0; i < n; i++) {
+    try {
+      fs.writevSync(fd, [buffer]);


In order to remove dead code elimination store the result of this operation and assert it when the benchmark finishes.

lib/fs.js

src/node_file.cc

mscdex · 2023-10-04T15:25:57Z

Did you swap the old and new node binary parameters when comparing the benchmarks or is that actually a 58% performance regression?

src/node_file.cc

mscdex · 2023-10-05T01:46:52Z

FWIW the changes currently result in:

fs/bench-writevSync.js n=100000 type='valid'                -0.83 %       ±7.81% ±10.40% ±13.55%

I'm guessing this should instead be more about improving the error case?

anonrig · 2023-10-05T15:50:03Z

benchmark/fs/bench-writevSync.js

+
+      bench.start();
+      for (let i = 0; i < n; i++) {
+        try {


We don't need a try/catch on valid part

anonrig · 2023-10-05T15:51:09Z

benchmark/fs/bench-writevSync.js

+      fs.closeSync(fd);
+      break;
+    case 'invalid':
+      fd = tmpdir.resolve(`.non-existing-file-${process.pid}`);


This is not a file descriptor. The variable name suggests fd

nodejs-github-bot · 2023-10-07T23:59:16Z

CI: https://ci.nodejs.org/job/node-test-pull-request/54606/

nodejs-github-bot · 2023-10-08T21:48:00Z

CI: https://ci.nodejs.org/job/node-test-pull-request/54626/

nodejs-github-bot · 2023-10-12T01:58:42Z

Landed in bf0f078

PR-URL: nodejs#50038 Refs: nodejs/performance#106 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

PR-URL: #50038 Refs: nodejs/performance#106 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

PR-URL: nodejs#50038 Refs: nodejs/performance#106 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. fs Issues and PRs related to the fs subsystem / file system. needs-ci PRs that need a full CI run. labels Oct 4, 2023

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fs: improve error performance of writevSync

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IlyasShabi force-pushed the writev-sync branch from 2a2ca8b to 4babf4d Compare October 7, 2023 18:38

IlyasShabi changed the title ~~fs: improve writevSync performance~~ fs: improve error performance of writevSync Oct 7, 2023

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2023-10-17, Version 21.0.0 (Current) #49870

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fs: improve error performance of writevSync

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PR-URL: nodejs#50038 Refs: nodejs/performance#106 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

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PR-URL: #50038 Refs: nodejs/performance#106 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

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PR-URL: nodejs#50038 Refs: nodejs/performance#106 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

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