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async_hooks: faster AsyncResource#bind() #43065

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async_hooks: faster AsyncResource#bind() #43065

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20 changes: 20 additions & 0 deletions benchmark/async_hooks/async-resource-bind.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
'use strict';
const common = require('../common.js');
const { AsyncResource } = require('async_hooks');

const noop = () => {};
const thisArg = {};
const resource = new AsyncResource('test');

const bench = common.createBenchmark(main, {
n: [1e100],
option: ['withThisArg', 'withoutThisArg']
});

function main({ n, option }) {
bench.start();
for (let i = 0; i < 1e7; i++) {
resource.bind(noop, null, option === 'withThisArg' ? thisArg : undefined);
}
bench.end(n);
}
21 changes: 7 additions & 14 deletions lib/async_hooks.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ const {
ArrayPrototypeUnshift,
FunctionPrototypeBind,
NumberIsSafeInteger,
ObjectDefineProperties,
ObjectDefineProperty,
ObjectIs,
ReflectApply,
Symbol,
Expand Down Expand Up @@ -236,20 +236,13 @@ class AsyncResource {
} else {
bound = FunctionPrototypeBind(this.runInAsyncScope, this, fn, thisArg);
}
ObjectDefineProperties(bound, {
'length': {
configurable: true,
enumerable: false,
value: fn.length,
writable: false,
},
'asyncResource': {
configurable: true,
enumerable: true,
value: this,
writable: true,
}
ObjectDefineProperty(bound, 'length', {
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Why not just stop doing this completely? This is only one of the cases needed to preserve the original functionality as the function could also have other properties or symbols attached to it for example, and those wouldn't be copied. Maybe the best approach then would be to copy nothing and leave it to the user to decide what needs copying. Then the implementation will be as fast as it can be and will only become slower if the user decides that copying properties is needed.

configurable: true,
enumerable: false,
value: fn.length,
writable: false,
});
bound.asyncResource = this;
return bound;
}

Expand Down