lib: define Event.isTrusted in the prototype #46974

santigimeno · 2023-03-06T14:47:26Z

We have been discussing in nodejs/performance#32 whether deviating from the spec with regards to Event.isTrusted would be acceptable for Node.js in order to avoid a significant performance hit. The spec defines the property as LegacyUnforgeable, but defining the property in the prototype instead of the constructor produces the following numbers:

./node benchmark/compare.js --new ./node --old ./node_old --runs 30 --filter messageport --filter eventtarget worker events  | Rscript benchmark/compare.R
[00:11:52|% 100| 3/3 files | 60/60 runs | 3/3 configs]: Done
                                                                       confidence improvement accuracy (*)   (**)   (***)
events/eventtarget-add-remove.js nListener=10 n=1000000                               0.25 %       ±1.31% ±1.75%  ±2.27%
events/eventtarget-add-remove.js nListener=5 n=1000000                               -1.05 %       ±1.29% ±1.71%  ±2.23%
events/eventtarget.js listeners=1 n=1000000                                  ***    177.72 %       ±3.72% ±5.00%  ±6.59%
events/eventtarget.js listeners=10 n=1000000                                 ***    100.93 %       ±7.30% ±9.83% ±13.04%
events/eventtarget.js listeners=5 n=1000000                                  ***    140.92 %       ±2.50% ±3.35%  ±4.41%
worker/messageport.js n=1000000 style='eventemitter' payload='object'         **     -2.88 %       ±1.93% ±2.57%  ±3.35%
worker/messageport.js n=1000000 style='eventemitter' payload='string'                -0.45 %       ±1.30% ±1.73%  ±2.25%
worker/messageport.js n=1000000 style='eventtarget' payload='object'         ***     25.68 %       ±2.27% ±3.03%  ±3.97%
worker/messageport.js n=1000000 style='eventtarget' payload='string'         ***     43.62 %       ±2.51% ±3.35%  ±4.39%

I'd like to have some feedback whether a change like this would be ok for Node.js (not being in the browser), specially from people more familiar with the standard. If that's the case I'll update the tests that are currently failing. Thanks!

lib/internal/event_target.js

cjihrig · 2023-03-06T16:15:42Z

Do we understand why the spec'ed implementation is so much slower? Is it something that V8 could improve?

santigimeno · 2023-03-06T17:35:10Z

Do we understand why the spec'ed implementation is so much slower? Is it something that V8 could improve?

I think https://bugs.chromium.org/p/v8/issues/detail?id=8447 might be relevant

bnoordhuis

Seems like a good tradeoff to me: obscure and largely irrelevant property vs. big performance jump.

Don't conform to the spec with isTrusted. The spec defines it as `LegacyUnforgeable` but defining it in the constructor has a big performance impact and the property doesn't seem to be useful outside of browsers. Refs: nodejs/performance#32

nodejs-github-bot · 2023-03-20T15:50:13Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50492/

nodejs-github-bot · 2023-03-20T21:05:19Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50498/

anonrig

🚀

nodejs-github-bot · 2023-03-29T18:05:13Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50671/

nodejs-github-bot · 2023-03-31T11:07:23Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50741/

nodejs-github-bot · 2023-03-31T16:24:13Z

CI: https://ci.nodejs.org/job/node-test-pull-request/50757/

jasnell · 2023-03-31T20:40:18Z

Given that we are intentionally deviating from the spec here, the docs should be updated to reflect that deviation

nodejs-github-bot · 2023-04-03T17:02:28Z

Landed in 74b9cf2

Don't conform to the spec with isTrusted. The spec defines it as `LegacyUnforgeable` but defining it in the constructor has a big performance impact and the property doesn't seem to be useful outside of browsers. Refs: nodejs/performance#32 PR-URL: #46974 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com>

Don't conform to the spec with isTrusted. The spec defines it as `LegacyUnforgeable` but defining it in the constructor has a big performance impact and the property doesn't seem to be useful outside of browsers. Refs: nodejs/performance#32 PR-URL: nodejs#46974 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com>

This PR optimizes `Event` constructor - ~Added a fast path for empty `eventInitDict`~ Removed `EventInit` dictionary converter - Don't make `isTrusted` a [LegacyUnforgeable](https://webidl.spec.whatwg.org/#LegacyUnforgeable) property. Doing so makes it non-spec compliant but calling `Object/Reflect.defineProperty` on the constructor is a big bottleneck. Node did the same a few months ago nodejs/node#46974. In my opinion, the performance gains are worth deviating from the spec for a browser-related property. **This PR** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 36.69 ns/iter 27,257,504.6 (33.36 ns … 42.45 ns) 37.71 ns 39.61 ns 40.07 ns event constructor 36.7 ns/iter 27,246,776.6 (33.35 ns … 56.03 ns) 37.73 ns 40.14 ns 41.74 ns ``` **main** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 380.48 ns/iter 2,628,275.8 (366.66 ns … 399.39 ns) 384.58 ns 398.27 ns 399.39 ns event constructor 480.33 ns/iter 2,081,882.6 (466.67 ns … 503.47 ns) 484.27 ns 501.28 ns 503.47 ns ``` ```js Deno.bench("event constructor no init", () => { const event = new Event("foo"); }); Deno.bench("event constructor", () => { const event = new Event("foo", { bubbles: true, cancelable: false }); }); ``` towards #20167

This PR optimizes `Event` constructor - ~Added a fast path for empty `eventInitDict`~ Removed `EventInit` dictionary converter - Don't make `isTrusted` a [LegacyUnforgeable](https://webidl.spec.whatwg.org/#LegacyUnforgeable) property. Doing so makes it non-spec compliant but calling `Object/Reflect.defineProperty` on the constructor is a big bottleneck. Node did the same a few months ago nodejs/node#46974. In my opinion, the performance gains are worth deviating from the spec for a browser-related property. **This PR** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 36.69 ns/iter 27,257,504.6 (33.36 ns … 42.45 ns) 37.71 ns 39.61 ns 40.07 ns event constructor 36.7 ns/iter 27,246,776.6 (33.35 ns … 56.03 ns) 37.73 ns 40.14 ns 41.74 ns ``` **main** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 380.48 ns/iter 2,628,275.8 (366.66 ns … 399.39 ns) 384.58 ns 398.27 ns 399.39 ns event constructor 480.33 ns/iter 2,081,882.6 (466.67 ns … 503.47 ns) 484.27 ns 501.28 ns 503.47 ns ``` ```js Deno.bench("event constructor no init", () => { const event = new Event("foo"); }); Deno.bench("event constructor", () => { const event = new Event("foo", { bubbles: true, cancelable: false }); }); ``` towards denoland#20167

This PR optimizes `Event` constructor - ~Added a fast path for empty `eventInitDict`~ Removed `EventInit` dictionary converter - Don't make `isTrusted` a [LegacyUnforgeable](https://webidl.spec.whatwg.org/#LegacyUnforgeable) property. Doing so makes it non-spec compliant but calling `Object/Reflect.defineProperty` on the constructor is a big bottleneck. Node did the same a few months ago nodejs/node#46974. In my opinion, the performance gains are worth deviating from the spec for a browser-related property. **This PR** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 36.69 ns/iter 27,257,504.6 (33.36 ns … 42.45 ns) 37.71 ns 39.61 ns 40.07 ns event constructor 36.7 ns/iter 27,246,776.6 (33.35 ns … 56.03 ns) 37.73 ns 40.14 ns 41.74 ns ``` **main** ``` cpu: 13th Gen Intel(R) Core(TM) i9-13900H runtime: deno 1.36.1 (x86_64-unknown-linux-gnu) benchmark time (avg) iter/s (min … max) p75 p99 p995 ------------------------------------------------------------------------------- ----------------------------- event constructor no init 380.48 ns/iter 2,628,275.8 (366.66 ns … 399.39 ns) 384.58 ns 398.27 ns 399.39 ns event constructor 480.33 ns/iter 2,081,882.6 (466.67 ns … 503.47 ns) 484.27 ns 501.28 ns 503.47 ns ``` ```js Deno.bench("event constructor no init", () => { const event = new Event("foo"); }); Deno.bench("event constructor", () => { const event = new Event("foo", { bubbles: true, cancelable: false }); }); ``` towards #20167

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EventTarget nodejs/performance#32

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santigimeno force-pushed the santi/is_trusted_proto branch from 9235d8d to 6cf3af6 Compare March 6, 2023 15:31

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lib: define Event.isTrusted in the prototype

f7c80d9

Don't conform to the spec with isTrusted. The spec defines it as `LegacyUnforgeable` but defining it in the constructor has a big performance impact and the property doesn't seem to be useful outside of browsers. Refs: nodejs/performance#32

santigimeno force-pushed the santi/is_trusted_proto branch from 6cf3af6 to f7c80d9 Compare March 20, 2023 15:21

santigimeno marked this pull request as ready for review March 20, 2023 15:22

santigimeno changed the title ~~RFC: define Event.isTrusted in the prototype~~ lib: define Event.isTrusted in the prototype Mar 20, 2023

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lib: define Event.isTrusted in the prototype #46974

lib: define Event.isTrusted in the prototype #46974

santigimeno commented Mar 6, 2023

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lib: define Event.isTrusted in the prototype #46974

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