stream: improve `ReadableStream.tee` perf by remove `ReflectConstruct` usage #49546

rluvaton · 2023-09-07T22:58:05Z

also added more webstream creation benchmarks

My local benchmark shows improvement of 2 times:

After:

webstreams/creation.js kind="ReadableStream.tee" n=50000: 126,685.06978447069 # Before
webstreams/creation.js kind="ReadableStream.tee" n=50000: 242,524.97642257062 # After

Benchmark CI output:

00:22:52.357 ++ Rscript benchmark/compare.R
00:22:53.287                                                                         confidence improvement accuracy (*)    (**)   (***)
00:22:53.287 webstreams/creation.js kind='ReadableStream.tee' n=50000                       ***     86.53 %       ±3.55%  ±4.75%  ±6.24%
00:22:53.287 webstreams/creation.js kind='ReadableStream' n=50000                                    1.83 %       ±3.38%  ±4.50%  ±5.86%
00:22:53.287 webstreams/creation.js kind='ReadableStreamBYOBReader' n=50000                         -0.23 %       ±3.61%  ±4.81%  ±6.26%
00:22:53.287 webstreams/creation.js kind='ReadableStreamDefaultReader' n=50000                       9.73 %      ±11.91% ±15.87% ±20.70%
00:22:53.287 webstreams/creation.js kind='TransformStream' n=50000                                   0.96 %       ±2.82%  ±3.75%  ±4.89%
00:22:53.287 webstreams/creation.js kind='WritableStream' n=50000                                   -1.19 %       ±4.27%  ±5.68%  ±7.40%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=1024 n=5000000                -0.19 %       ±4.53%  ±6.03%  ±7.86%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=2048 n=5000000                -3.72 %       ±4.90%  ±6.53%  ±8.53%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=4096 n=5000000                 2.64 %       ±3.81%  ±5.07%  ±6.60%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=1024 highWaterMarkR=512 n=5000000                  3.33 %       ±4.26%  ±5.70%  ±7.49%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=1024 n=5000000                 0.78 %       ±4.03%  ±5.36%  ±6.98%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=2048 n=5000000                -1.02 %       ±3.54%  ±4.71%  ±6.14%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=4096 n=5000000                -4.02 %       ±4.44%  ±5.93%  ±7.75%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=2048 highWaterMarkR=512 n=5000000                 -2.21 %       ±3.80%  ±5.06%  ±6.60%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=1024 n=5000000                -1.65 %       ±3.45%  ±4.59%  ±5.98%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=2048 n=5000000                -1.65 %       ±3.83%  ±5.11%  ±6.66%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=4096 n=5000000                 1.25 %       ±3.83%  ±5.10%  ±6.64%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=4096 highWaterMarkR=512 n=5000000                 -1.78 %       ±4.88%  ±6.50%  ±8.46%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=1024 n=5000000                  3.39 %       ±5.70%  ±7.58%  ±9.87%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=2048 n=5000000                 -2.18 %       ±5.81%  ±7.74% ±10.11%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=4096 n=5000000                 -1.72 %       ±3.33%  ±4.43%  ±5.77%
00:22:53.287 webstreams/pipe-to.js highWaterMarkW=512 highWaterMarkR=512 n=5000000                   1.77 %       ±4.47%  ±5.96%  ±7.77%
00:22:53.382 webstreams/readable-async-iterator.js n=100000                                          1.66 %       ±7.72% ±10.27% ±13.36%
00:22:53.383 
00:22:53.383 Be aware that when doing many comparisons the risk of a false-positive
00:22:53.383 result increases. In this case, there are 23 comparisons, you can thus
00:22:53.383 expect the following amount of false-positive results:
00:22:53.383   1.15 false positives, when considering a   5% risk acceptance (*, **, ***),
00:22:53.383   0.23 false positives, when considering a   1% risk acceptance (**, ***),
00:22:53.383   0.02 false positives, when considering a 0.1% risk acceptance (***)

also added more webstream creation benchmarks

rluvaton · 2023-09-07T23:01:02Z

lib/internal/webstreams/readablestream.js

+  // For spec compliance the Tee must be a ReadableStream
+  tee.constructor = ReadableStream;


Otherwise, the wpt tee test fails:

node/test/fixtures/wpt/streams/readable-streams/tee.any.js

Lines 8 to 18 in 6dde810

test(() => {

const rs = new ReadableStream();

const result = rs.tee();

assert_true(Array.isArray(result), 'return value should be an array');

assert_equals(result.length, 2, 'array should have length 2');

assert_equals(result[0].constructor, ReadableStream, '0th element should be a ReadableStream');

assert_equals(result[1].constructor, ReadableStream, '1st element should be a ReadableStream');

}, 'ReadableStream teeing: rs.tee() returns an array of two ReadableStreams');

And the spec says

Tees this readable stream, returning a two-element array containing the two resulting branches as new ReadableStream instances.

From the Spec

rluvaton · 2023-09-07T23:02:49Z

Benchmark CI:
https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1367/

nodejs-github-bot · 2023-09-07T23:05:41Z

CI: https://ci.nodejs.org/job/node-test-pull-request/53794/

nodejs-github-bot · 2023-09-07T23:14:02Z

CI: https://ci.nodejs.org/job/node-test-pull-request/53795/

anonrig

You beat me to it. Good work!

nodejs-github-bot · 2023-09-08T01:22:24Z

CI: https://ci.nodejs.org/job/node-test-pull-request/53797/

nodejs-github-bot · 2023-09-08T01:34:22Z

CI: https://ci.nodejs.org/job/node-test-pull-request/53798/

KhafraDev · 2023-09-08T02:56:03Z

lib/internal/webstreams/readablestream.js

@@ -1199,34 +1199,41 @@ ObjectDefineProperties(ReadableByteStreamController.prototype, {
  [SymbolToStringTag]: getNonWritablePropertyDescriptor(ReadableByteStreamController.name),
 });

+function TeeReadableStream(start, pull, cancel) {


is there a reason this can't be a normal class? Would help with the inheritance/prototype hacks needed

I'll have to call super and the original implementation don't call the constructor

I think it would simplify the code significantly, not blocking or anything

so you mean to just convert it to class with extends but without super?

when I do the WPT tests fails so keeping it as is

nodejs-github-bot · 2023-09-08T09:58:41Z

CI: https://ci.nodejs.org/job/node-test-pull-request/53809/

nodejs-github-bot · 2023-09-08T10:48:06Z

CI: https://ci.nodejs.org/job/node-test-pull-request/53811/

nodejs-github-bot · 2023-09-10T08:35:10Z

CI: https://ci.nodejs.org/job/node-test-pull-request/53860/

mcollina

lgtm

nodejs-github-bot · 2023-09-11T07:45:13Z

Landed in a7fe8b0

also added more webstream creation benchmarks PR-URL: nodejs#49546 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

also added more webstream creation benchmarks PR-URL: #49546 Backport-PR-URL: #49620 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

also added more webstream creation benchmarks PR-URL: nodejs#49546 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

stream: improve tee perf by reduce ReflectConstruct usages

76c567a

also added more webstream creation benchmarks

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This was referenced Sep 9, 2023

CI Reliability 2023-09-09 nodejs/reliability#660

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CI Reliability 2023-09-10 nodejs/reliability#661

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H4ad mentioned this pull request Sep 10, 2023

Perf of ReflectConstruct nodejs/performance#109

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CI Reliability 2023-09-11 nodejs/reliability#662

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v20.7.0 proposal #49592

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CI Reliability 2023-09-12 nodejs/reliability#663

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[v20.x backport] stream: improve tee perf by reduce ReflectConstruct usages #49620

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stream: improve `ReadableStream.tee` perf by remove `ReflectConstruct` usage #49546

stream: improve `ReadableStream.tee` perf by remove `ReflectConstruct` usage #49546

rluvaton commented Sep 7, 2023 •

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		// For spec compliance the Tee must be a ReadableStream
		tee.constructor = ReadableStream;

	test(() => {

	const rs = new ReadableStream();
	const result = rs.tee();

	assert_true(Array.isArray(result), 'return value should be an array');
	assert_equals(result.length, 2, 'array should have length 2');
	assert_equals(result[0].constructor, ReadableStream, '0th element should be a ReadableStream');
	assert_equals(result[1].constructor, ReadableStream, '1st element should be a ReadableStream');

	}, 'ReadableStream teeing: rs.tee() returns an array of two ReadableStreams');

stream: improve ReadableStream.tee perf by remove ReflectConstruct usage #49546

stream: improve ReadableStream.tee perf by remove ReflectConstruct usage #49546

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stream: improve `ReadableStream.tee` perf by remove `ReflectConstruct` usage #49546

stream: improve `ReadableStream.tee` perf by remove `ReflectConstruct` usage #49546

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