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To copy the values of all enumerable own properties from- a source object to a target object, node still use- `util._extend`, though newer standard `Object.assign` is available. This is because `util._extend` is found to be faster than `Object.assign`. This benchmark test is to keep track of how performance compare. PR-URL: https://github.com/nodejs/node/pull/7255 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Brian White <mscdex@mscdex.net>v7.x
surya panikkal
9 years ago
committed by
James M Snell
1 changed files with 40 additions and 0 deletions
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'use strict'; |
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const common = require('../common.js'); |
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const util = require('util'); |
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const v8 = require('v8'); |
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const bench = common.createBenchmark(main, { |
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type: ['extend', 'assign'], |
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n: [10e4] |
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}); |
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function main(conf) { |
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let fn; |
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const n = conf.n | 0; |
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let v8command; |
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if (conf.type === 'extend') { |
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fn = util._extend; |
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v8command = '%OptimizeFunctionOnNextCall(util._extend)'; |
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} else if (conf.type === 'assign') { |
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fn = Object.assign; |
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// Object.assign is built-in, cannot be optimized
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v8command = ''; |
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} |
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// Force-optimize the method to test so that the benchmark doesn't
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// get disrupted by the optimizer kicking in halfway through.
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for (var i = 0; i < conf.type.length * 10; i += 1) |
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fn({}, process.env); |
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v8.setFlagsFromString('--allow_natives_syntax'); |
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eval(v8command); |
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var obj = new Proxy({}, { set: function(a, b, c) { return true; } }); |
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bench.start(); |
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for (var j = 0; j < n; j += 1) |
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fn(obj, process.env); |
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bench.end(n); |
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} |
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