src: replace pushValueToArray with pure C++ API #24125

joyeecheung · 2018-11-06T11:24:52Z

The first commit just landed upstream: https://chromium-review.googlesource.com/c/1317049
The second commit replaces the pushValueToArray hack with the new V8 API in fs.readdir and fs.readdirSync.
The third commit added more options to the readdir benchmark.

Local benchmark results:

                                                                        confidence improvement accuracy (*)   (**)  (***)
 fs/bench-readdir.js withFileTypes='false' dir='lib' n=10                              -0.33 %       ±4.75% ±6.33% ±8.26%
 fs/bench-readdir.js withFileTypes='false' dir='test/parallel' n=10            ***      8.96 %       ±2.83% ±3.78% ±4.93%
 fs/bench-readdir.js withFileTypes='true' dir='lib' n=10                                0.17 %       ±4.36% ±5.80% ±7.56%
 fs/bench-readdir.js withFileTypes='true' dir='test/parallel' n=10                      0.53 %       ±2.37% ±3.16% ±4.11%
 fs/bench-readdirSync.js withFileTypes='false' dir='lib' n=10                  ***      6.21 %       ±3.41% ±4.56% ±5.97%
 fs/bench-readdirSync.js withFileTypes='false' dir='test/parallel' n=10        ***     13.29 %       ±2.35% ±3.13% ±4.08%
 fs/bench-readdirSync.js withFileTypes='true' dir='lib' n=10                   ***      6.27 %       ±1.81% ±2.41% ±3.15%
 fs/bench-readdirSync.js withFileTypes='true' dir='test/parallel' n=10         ***      9.88 %       ±2.51% ±3.34% ±4.35%

With this I hope we can remove all the push_values_to_array_function usage and get rid of SetupProcessObject eventually - that can be done in later PRs, of course.

deps: cherry-pick `0483e9a` from upstream V8

Original commit message:

[api] Allow embedder to construct an Array from Local<Value>*

Currently to obtain a v8::Array out of a C array or a std::vector,
one needs to loop through the elements and call array->Set() multiple
times, and these calls go into v8::Object::Set() which can be slow.
This patch adds a new Array::New overload that converts a
Local<Value>* with known size into a Local<Array>.

Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188
Reviewed-on: https://chromium-review.googlesource.com/c/1317049
Reviewed-by: Yang Guo <[email protected]>
Reviewed-by: Adam Klein <[email protected]>
Commit-Queue: Joyee Cheung <[email protected]>
Cr-Commit-Position: refs/heads/master@{#57261}

Refs: v8/v8@0483e9a

fs: replace pushValueToArray with pure C++ API

Instead of calling into JS from C++ to push values into an array,
use the new Array::New API that takes a pointer and a length
directly.

benchmark: add dir and withFileTypes option readdir benchmarks

Checklist

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

Original commit message: [api] Allow embedder to construct an Array from Local<Value>* Currently to obtain a v8::Array out of a C array or a std::vector, one needs to loop through the elements and call array->Set() multiple times, and these calls go into v8::Object::Set() which can be slow. This patch adds a new Array::New overload that converts a Local<Value>* with known size into a Local<Array>. Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188 Reviewed-on: https://chromium-review.googlesource.com/c/1317049 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Adam Klein <[email protected]> Commit-Queue: Joyee Cheung <[email protected]> Cr-Commit-Position: refs/heads/master@{#57261} Refs: v8/v8@0483e9a

Instead of calling into JS from C++ to push values into an array, use the new Array::New API that takes a pointer and a length directly.

nodejs-github-bot · 2018-11-06T11:24:53Z

@joyeecheung build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/1510/pipeline

joyeecheung · 2018-11-06T11:26:44Z

CI: https://ci.nodejs.org/job/node-test-pull-request/18363/
Benchmark CI: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/259/

cc @addaleax @hashseed

joyeecheung · 2018-11-06T12:54:26Z

From the Benchmark CI:

Benchmark results

                                                                        confidence improvement accuracy (*)   (**)   (***)
 fs/bench-readdir.js withFileTypes='false' dir='lib' n=10                       **      4.16 %       ±2.84% ±3.78%  ±4.92%
 fs/bench-readdir.js withFileTypes='false' dir='test/parallel' n=10            ***     16.63 %       ±2.50% ±3.32%  ±4.33%
 fs/bench-readdir.js withFileTypes='true' dir='lib' n=10                        **      4.58 %       ±3.15% ±4.20%  ±5.49%
 fs/bench-readdir.js withFileTypes='true' dir='test/parallel' n=10             ***     12.46 %       ±2.22% ±2.96%  ±3.86%
 fs/bench-readdirSync.js withFileTypes='false' dir='lib' n=10                           6.01 %       ±7.39% ±9.84% ±12.81%
 fs/bench-readdirSync.js withFileTypes='false' dir='test/parallel' n=10        ***     18.95 %       ±5.27% ±7.02%  ±9.17%
 fs/bench-readdirSync.js withFileTypes='true' dir='lib' n=10                     *      5.94 %       ±5.64% ±7.51%  ±9.77%
 fs/bench-readdirSync.js withFileTypes='true' dir='test/parallel' n=10         ***     14.33 %       ±4.42% ±5.89%  ±7.68%

Be aware that when doing many comparisons the risk of a false-positive
result increases. In this case there are 8 comparisons, you can thus
expect the following amount of false-positive results:
  0.40 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.08 false positives, when considering a   1% risk acceptance (**, ***),
  0.01 false positives, when considering a 0.1% risk acceptance (***)
Notifying upstream projects of job completion
Finished: SUCCESS

Significant impact

                                                                        confidence improvement accuracy (*)   (**)   (***)
 fs/bench-readdir.js withFileTypes='false' dir='lib' n=10                       **      4.16 %       ±2.84% ±3.78%  ±4.92%
 fs/bench-readdir.js withFileTypes='false' dir='test/parallel' n=10            ***     16.63 %       ±2.50% ±3.32%  ±4.33%
 fs/bench-readdir.js withFileTypes='true' dir='lib' n=10                        **      4.58 %       ±3.15% ±4.20%  ±5.49%
 fs/bench-readdir.js withFileTypes='true' dir='test/parallel' n=10             ***     12.46 %       ±2.22% ±2.96%  ±3.86%
 fs/bench-readdirSync.js withFileTypes='false' dir='test/parallel' n=10        ***     18.95 %       ±5.27% ±7.02%  ±9.17%
 fs/bench-readdirSync.js withFileTypes='true' dir='lib' n=10                     *      5.94 %       ±5.64% ±7.51%  ±9.77%
 fs/bench-readdirSync.js withFileTypes='true' dir='test/parallel' n=10         ***     14.33 %       ±4.42% ±5.89%  ±7.68%

bnoordhuis

LGTM with suggestions. Nice work.

bnoordhuis · 2018-11-06T18:32:59Z

benchmark/fs/bench-readdir.js

  bench.start();
  (function r(cntr) {
    if (cntr-- <= 0)
      return bench.end(n);
-    fs.readdir(path.resolve(__dirname, '../../lib/'), function() {
+    const fullPath = path.resolve(__dirname, '../../', dir);


Maybe something for a separate commit or PR but you could move this to before the bench.start() call. The fewer tangents the benchmark has, the better.

(Ditto in the other file.)

Done, thanks for spotting this! (Pretty sure I made a change for that before, somehow it got lost before I opened the PR..)

bnoordhuis · 2018-11-06T18:35:52Z

src/node_file.cc

-  result->Set(0, names);
-  result->Set(1, types);
+  result->Set(0, Array::New(isolate, name_v.data(), name_v.size()));
+  result->Set(1, Array::New(isolate, type_v.data(), type_v.size()));


You could improve on this a little by returning a single names+types array. You also need to update getDirents() in lib/internal/fs/utils.js if you do, but that should be straightforward.

@bnoordhuis Good idea, though I'd rather leave that as a follow-up

joyeecheung · 2018-11-06T20:51:57Z

(The CI seems silent, so hopefully I am not getting in the way of code and learn): I don't think I could break anything with the fixup but anyway another CI https://ci.nodejs.org/job/node-test-pull-request/18377/

refack

🎉

Original commit message: [api] Allow embedder to construct an Array from Local<Value>* Currently to obtain a v8::Array out of a C array or a std::vector, one needs to loop through the elements and call array->Set() multiple times, and these calls go into v8::Object::Set() which can be slow. This patch adds a new Array::New overload that converts a Local<Value>* with known size into a Local<Array>. Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188 Reviewed-on: https://chromium-review.googlesource.com/c/1317049 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Adam Klein <[email protected]> Commit-Queue: Joyee Cheung <[email protected]> Cr-Commit-Position: refs/heads/master@{#57261} Refs: v8/v8@0483e9a PR-URL: nodejs#24125 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

Instead of calling into JS from C++ to push values into an array, use the new Array::New API that takes a pointer and a length directly. PR-URL: nodejs#24125 Refs: v8/v8@0483e9a Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

PR-URL: nodejs#24125 Refs: v8/v8@0483e9a Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

Trott · 2018-11-08T23:04:37Z

Landed in 7d86a53...ca51b94

Original commit message: [api] Allow embedder to construct an Array from Local<Value>* Currently to obtain a v8::Array out of a C array or a std::vector, one needs to loop through the elements and call array->Set() multiple times, and these calls go into v8::Object::Set() which can be slow. This patch adds a new Array::New overload that converts a Local<Value>* with known size into a Local<Array>. Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188 Reviewed-on: https://chromium-review.googlesource.com/c/1317049 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Adam Klein <[email protected]> Commit-Queue: Joyee Cheung <[email protected]> Cr-Commit-Position: refs/heads/master@{#57261} Refs: v8/v8@0483e9a PR-URL: #24125 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

Instead of calling into JS from C++ to push values into an array, use the new Array::New API that takes a pointer and a length directly. PR-URL: #24125 Refs: v8/v8@0483e9a Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

PR-URL: #24125 Refs: v8/v8@0483e9a Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

Original commit message: [api] Allow embedder to construct an Array from Local<Value>* Currently to obtain a v8::Array out of a C array or a std::vector, one needs to loop through the elements and call array->Set() multiple times, and these calls go into v8::Object::Set() which can be slow. This patch adds a new Array::New overload that converts a Local<Value>* with known size into a Local<Array>. Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188 Reviewed-on: https://chromium-review.googlesource.com/c/1317049 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Adam Klein <[email protected]> Commit-Queue: Joyee Cheung <[email protected]> Cr-Commit-Position: refs/heads/master@{#57261} Refs: v8/v8@0483e9a PR-URL: nodejs#24125 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

Instead of calling into JS from C++ to push values into an array, use the new Array::New API that takes a pointer and a length directly. PR-URL: nodejs#24125 Refs: v8/v8@0483e9a Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

PR-URL: nodejs#24125 Refs: v8/v8@0483e9a Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

replace with C++ API. Refs: nodejs#24125

replace with C++ API. Refs: #24125 PR-URL: #24614 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: Gus Caplan <[email protected]>

Original commit message: [api] Allow embedder to construct an Array from Local<Value>* Currently to obtain a v8::Array out of a C array or a std::vector, one needs to loop through the elements and call array->Set() multiple times, and these calls go into v8::Object::Set() which can be slow. This patch adds a new Array::New overload that converts a Local<Value>* with known size into a Local<Array>. Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188 Reviewed-on: https://chromium-review.googlesource.com/c/1317049 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Adam Klein <[email protected]> Commit-Queue: Joyee Cheung <[email protected]> Cr-Commit-Position: refs/heads/master@{#57261} Refs: v8/v8@0483e9a PR-URL: nodejs#24125 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

codebytere · 2018-12-13T22:06:54Z

@joyeecheung is this a candidate for v10.x? if so, could you please backport it?

replace with C++ API. Refs: nodejs#24125 PR-URL: nodejs#24614 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: Gus Caplan <[email protected]>

Original commit message: [api] Allow embedder to construct an Array from Local<Value>* Currently to obtain a v8::Array out of a C array or a std::vector, one needs to loop through the elements and call array->Set() multiple times, and these calls go into v8::Object::Set() which can be slow. This patch adds a new Array::New overload that converts a Local<Value>* with known size into a Local<Array>. Change-Id: I0a768f0e18eec51e78d58be455482ec6425ca188 Reviewed-on: https://chromium-review.googlesource.com/c/1317049 Reviewed-by: Yang Guo <[email protected]> Reviewed-by: Adam Klein <[email protected]> Commit-Queue: Joyee Cheung <[email protected]> Cr-Commit-Position: refs/heads/master@{#57261} Refs: v8/v8@0483e9a PR-URL: nodejs#24125 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Yang Guo <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Refael Ackermann <[email protected]>

joyeecheung added 3 commits November 6, 2018 18:05

fs: replace pushValueToArray with pure C++ API

e02f5a6

Instead of calling into JS from C++ to push values into an array, use the new Array::New API that takes a pointer and a length directly.

benchmark: add dir and withFileTypes option readdir benchmarks

72c6b4b

nodejs-github-bot added the lib / src Issues and PRs related to general changes in the lib or src directory. label Nov 6, 2018

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fixup! benchmark: add dir and withFileTypes option readdir benchmarks

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src: remove pushValueToArray and setupProcessObject #24264

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Release proposal: v11.2 #24350

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Code And Learn 2018 nodejsjp/node-1#1

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src: migrate to new V8 array API #24613

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src: replace array implementation

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replace with C++ API. Refs: nodejs#24125

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src: replace pushValueToArray with pure C++ API #24125

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src: replace pushValueToArray with pure C++ API #24125

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joyeecheung commented Nov 6, 2018 • edited Loading

deps: cherry-pick 0483e9a from upstream V8

fs: replace pushValueToArray with pure C++ API

benchmark: add dir and withFileTypes option readdir benchmarks

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deps: cherry-pick `0483e9a` from upstream V8

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