buffer: improve fill(number) performance #31489

mscdex · 2020-01-24T07:48:49Z

Uses the native typedArray.fill() when filling with a number instead of calling into the binding fill function.

Benchmark results:

                                                                            confidence improvement accuracy (*)   (**)  (***)
 buffers/buffer-fill.js n=20000 size=65536 type='fill("")'                        ***      4.72 %       ±0.90% ±1.20% ±1.57%
 buffers/buffer-fill.js n=20000 size=65536 type='fill("t", "utf8")'               ***      3.76 %       ±1.00% ±1.34% ±1.74%
 buffers/buffer-fill.js n=20000 size=65536 type='fill("t", 0, "utf8")'            ***      4.30 %       ±0.74% ±0.99% ±1.29%
 buffers/buffer-fill.js n=20000 size=65536 type='fill("t", 0)'                    ***      5.56 %       ±0.90% ±1.20% ±1.56%
 buffers/buffer-fill.js n=20000 size=65536 type='fill("t")'                       ***      4.51 %       ±1.01% ±1.35% ±1.77%
 buffers/buffer-fill.js n=20000 size=65536 type='fill("test")'                             0.18 %       ±0.50% ±0.67% ±0.87%
 buffers/buffer-fill.js n=20000 size=65536 type='fill(0)'                         ***      4.10 %       ±0.84% ±1.12% ±1.46%
 buffers/buffer-fill.js n=20000 size=65536 type='fill(100)'                       ***      4.75 %       ±0.97% ±1.30% ±1.69%
 buffers/buffer-fill.js n=20000 size=65536 type='fill(400)'                       ***      5.17 %       ±1.12% ±1.50% ±1.95%
 buffers/buffer-fill.js n=20000 size=65536 type='fill(Buffer.alloc(1), 0)'                -0.50 %       ±0.66% ±0.88% ±1.15%
 buffers/buffer-fill.js n=20000 size=8192 type='fill("")'                         ***     17.23 %       ±1.65% ±2.20% ±2.86%
 buffers/buffer-fill.js n=20000 size=8192 type='fill("t", "utf8")'                ***     12.32 %       ±1.62% ±2.18% ±2.87%
 buffers/buffer-fill.js n=20000 size=8192 type='fill("t", 0, "utf8")'             ***     13.12 %       ±2.05% ±2.73% ±3.56%
 buffers/buffer-fill.js n=20000 size=8192 type='fill("t", 0)'                     ***     18.16 %       ±1.00% ±1.33% ±1.74%
 buffers/buffer-fill.js n=20000 size=8192 type='fill("t")'                        ***     12.18 %       ±1.64% ±2.18% ±2.86%
 buffers/buffer-fill.js n=20000 size=8192 type='fill("test")'                             -0.34 %       ±1.20% ±1.59% ±2.08%
 buffers/buffer-fill.js n=20000 size=8192 type='fill(0)'                          ***     26.16 %       ±2.99% ±3.99% ±5.21%
 buffers/buffer-fill.js n=20000 size=8192 type='fill(100)'                        ***     28.79 %       ±1.14% ±1.52% ±1.98%
 buffers/buffer-fill.js n=20000 size=8192 type='fill(400)'                        ***     28.91 %       ±1.20% ±1.60% ±2.08%
 buffers/buffer-fill.js n=20000 size=8192 type='fill(Buffer.alloc(1), 0)'                 -0.40 %       ±1.31% ±1.75% ±2.28%

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
commit message follows commit guidelines

nodejs-github-bot · 2020-01-24T07:49:50Z

CI: https://ci.nodejs.org/job/node-test-pull-request/28603/

bnoordhuis

LGTM % comments.

bnoordhuis · 2020-01-24T09:00:03Z

lib/buffer.js

@@ -101,6 +104,13 @@ const {
  addBufferPrototypeMethods
 } = require('internal/buffer');

+const TypedArrayPrototype = ObjectGetPrototypeOf(Uint8Array.prototype);


Suggested change

const TypedArrayPrototype = ObjectGetPrototypeOf(Uint8Array.prototype);

const Uint8ArrayPrototype = ObjectGetPrototypeOf(Uint8Array.prototype);

Uint8Array.prototype.constructor.name is Uint8Array, not TypedArray.

This line is correct as-is. The prototype of Uint8Array.prototype is the %TypedArray%.prototype.

@devsnek is correct, this is the prototype of the prototype, which is TypedArray. The same thing is done in internal/util/types.js.

lib/buffer.js

src/node_buffer.cc

nodejs-github-bot · 2020-01-24T11:12:26Z

CI: https://ci.nodejs.org/job/node-test-pull-request/28604/

lib/buffer.js

targos · 2020-01-24T15:10:18Z

I think we could also directly add TypedArray and its prototype to the primordials. I'll do that after this PR.

nodejs-github-bot · 2020-01-24T15:19:24Z

CI: https://ci.nodejs.org/job/node-test-pull-request/28607/

nodejs-github-bot · 2020-01-25T23:03:14Z

CI: https://ci.nodejs.org/job/node-test-pull-request/28668/

bnoordhuis · 2020-01-26T01:21:22Z

lib/buffer.js

+    if (res < 0) {
+      if (res === -1)
+        throw new ERR_INVALID_ARG_VALUE('value', value);
+      throw new ERR_BUFFER_OUT_OF_BOUNDS();


Future enhancement: res < 0 is sometimes a coercion-to-nan, sometimes not because bindingFill() returns either undefined or a number.

Changing Fill() in node_buffer.cc to always return a number is probably beneficial for performance.

nodejs-github-bot · 2020-01-26T02:01:43Z

CI: https://ci.nodejs.org/job/node-test-pull-request/28673/

PR-URL: nodejs#31489 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

nodejs-github-bot · 2020-01-27T01:05:19Z

CI: https://ci.nodejs.org/job/node-test-pull-request/28705/

Trott · 2020-01-27T02:34:39Z

This seems to have landed without first getting a clean CI run.

Trott · 2020-01-27T02:59:17Z

This seems to have landed without first getting a clean CI run.

Although if there was an impressive-benchmarks-mean-you-can-land-without-a-clean-CI rule, this would definitely qualify. 😍

PR-URL: #31489 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

mscdex added buffer Issues and PRs related to the buffer subsystem. performance Issues and PRs related to the performance of Node.js. labels Jan 24, 2020

nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Jan 24, 2020

bnoordhuis approved these changes Jan 24, 2020

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mscdex force-pushed the buffer-improve-fill-number-perf branch from 039c099 to aa45188 Compare January 24, 2020 11:08

addaleax approved these changes Jan 24, 2020

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BridgeAR added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Jan 24, 2020

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mscdex force-pushed the buffer-improve-fill-number-perf branch from aa45188 to ac9de4f Compare January 24, 2020 15:18

Trott approved these changes Jan 25, 2020

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mscdex force-pushed the buffer-improve-fill-number-perf branch from ac9de4f to 59cba9a Compare January 27, 2020 00:17

mscdex merged commit 59cba9a into nodejs:master Jan 27, 2020

mscdex deleted the buffer-improve-fill-number-perf branch January 27, 2020 00:21

codebytere mentioned this pull request Feb 17, 2020

v13.9.0 proposal #31837

Merged

codebytere mentioned this pull request Mar 17, 2020

v12.16.2 proposal #32313

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buffer: improve fill(number) performance #31489

buffer: improve fill(number) performance #31489

mscdex commented Jan 24, 2020 •

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Trott commented Jan 27, 2020

	const TypedArrayPrototype = ObjectGetPrototypeOf(Uint8Array.prototype);
	const Uint8ArrayPrototype = ObjectGetPrototypeOf(Uint8Array.prototype);

buffer: improve fill(number) performance #31489

buffer: improve fill(number) performance #31489

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