Thanks, I try Object.setPrototypeOf method. On Friday, August 5, 2016 at 5:56:09 PM UTC+8, Andreas Rossberg wrote: > > Seconding what Jakob said. As a rule of thumb, you should assume that > proxies are 10x slower than real objects, and that that is not going to > change radically. If some cases are faster than that then you are merely > lucky. > > On 5 August 2016 at 11:27, Jakob Kummerow <jkum...@chromium.org > <javascript:>> wrote: > >> I wouldn't say it's due to current implementation details. The >> specification for most Proxy operations just demands very complicated (and >> therefore slow) internal workflows. In performance-sensitive code, it's >> probably better to avoid using Proxies -- usually the same functionality >> can also be achieved using faster techniques (for example, your snippet >> looks like you could just put |origin| onto |target|'s prototype chain). >> >> On Fri, Aug 5, 2016 at 10:21 AM, <cbr...@chromium.org <javascript:>> >> wrote: >> >>> Proxies and the Reflect functions are implemented in C++ which means >>> that currently there are two things that will cause a slowdown over the >>> simple delegator object that installs getters and setters: >>> 1. the optimizing compiler cannot inline or otherwise improve calls to >>> proxies >>> 2. calls to proxies will always be more costly since we have to jump >>> from the JavaScript world to the C++ world >>> >>> A minor difference from the nodes delegates is that you do a full-blown >>> [[HasProperty]] check with Reflect.has (which walks up the prototype >>> chain), while in the delegates implementation you only check this once if >>> you use the auto-setup. >>> If you care a bit less for some corner cases you can do a keyed-load >>> from the target (target[key]) and just assume that if it's undefined you >>> have to look it up on origin object. >>> >>> let me know if this helps. >>> >>> On Friday, August 5, 2016 at 6:49:09 AM UTC+2, Fangdun Cai wrote: >>>> >>>> >>>> - Node 6.3.1: >>>> - macOS: >>>> >>>> I try use proxies for my project and created the >>>> https://github.com/fundon/delegate-proxy. >>>> >>>> But results from the benchmarks, proxy is very slowly. >>>> >>>> How to improve it? >>>> Source code >>>> >>>> module.exports = function delegateProxy (target, origin) { >>>> return new Proxy(target, { >>>> get (target, key, receiver) { >>>> if (Reflect.has(target, key)) return Reflect.get(target, key, >>>> receiver) >>>> const value = origin[key] >>>> return 'function' === typeof value ? function method () { >>>> return value.apply(origin, arguments) >>>> } : value >>>> }, >>>> set (target, key, value, receiver) { >>>> if (Reflect.has(target, key)) return Reflect.set(target, key, value, >>>> receiver) >>>> origin[key] = value >>>> return true >>>> } >>>> }) >>>> } >>>> >>>> Benchmarks code, delegate-proxy VS delegates >>>> >>>> const Benchmark = require('benchmark')const delegate = >>>> require('delegates')const delegateProxy = require('..') >>>> const obj = {} >>>> const p1 = {}const d1 = delegateProxy(p1, obj) >>>> const d0 = {}d0.obj = objconst d = delegate(d0, 'obj') >>>> for (let i = 0, l = 1000; i < l; i++) { >>>> obj[`a${i}`] = i >>>> obj[`b${i}`] = function () {} >>>> obj[`c${i}`] = i >>>> d.getter(`a${i}`) >>>> d.method(`b${i}`) >>>> d.access(`c${i}`) >>>> } >>>> const suite = new Benchmark.Suite() >>>> >>>> suite >>>> .add('delegates#getter', () => { >>>> /* eslint no-unused-expressions: 0 */ >>>> d0.a0 === 0 ? 1 : 0 >>>> }) >>>> .add('delegateProxy#getter', () => { >>>> /* eslint no-unused-expressions: 0 */ >>>> d1.a0 === 0 ? 1 : 0 >>>> }) >>>> .on('cycle', event => { >>>> console.log(String(event.target)) >>>> }) >>>> .on('complete', function () { >>>> console.log('Fastest is ' + this.filter('fastest').map('name')) >>>> }) >>>> .run() >>>> const suite2 = new Benchmark.Suite() >>>> >>>> suite2 >>>> .add('delegates#method', () => { >>>> d0.b0() >>>> }) >>>> .add('delegateProxy#method', () => { >>>> d1.b0() >>>> }) >>>> .on('cycle', event => { >>>> console.log(String(event.target)) >>>> }) >>>> .on('complete', function () { >>>> console.log('Fastest is ' + this.filter('fastest').map('name')) >>>> }) >>>> .run() >>>> const suite3 = new Benchmark.Suite() >>>> >>>> suite3 >>>> .add('delegates#access', () => { >>>> d0.c0 = 1 >>>> }) >>>> .add('delegateProxy#access', () => { >>>> d1.c0 = 1 >>>> }) >>>> .on('cycle', event => { >>>> console.log(String(event.target)) >>>> }) >>>> .on('complete', function () { >>>> console.log('Fastest is ' + this.filter('fastest').map('name')) >>>> }) >>>> .run() >>>> const suite4 = new Benchmark.Suite() >>>> >>>> suite4 >>>> .add('Reflect#get', () => { >>>> Reflect.get(obj, 'a0') >>>> }) >>>> .add('obj#key', () => { >>>> /* eslint dot-notation: 0 */ >>>> obj['a0'] >>>> }) >>>> .add('obj.key', () => { >>>> obj.a0 >>>> }) >>>> .on('cycle', event => { >>>> console.log(String(event.target)) >>>> }) >>>> .on('complete', function () { >>>> console.log('Fastest is ' + this.filter('fastest').map('name')) >>>> }) >>>> .run() >>>> const suite5 = new Benchmark.Suite() >>>> >>>> suite5 >>>> .add('Reflect#has', () => { >>>> Reflect.has(d0, 'a0') >>>> }) >>>> .add('key in d0', () => { >>>> 'a0' in d0 >>>> }) >>>> .on('cycle', event => { >>>> console.log(String(event.target)) >>>> }) >>>> .on('complete', function () { >>>> console.log('Fastest is ' + this.filter('fastest').map('name')) >>>> }) >>>> .run() >>>> const suite6 = new Benchmark.Suite() >>>> >>>> suite6 >>>> .add('Reflect#set', () => { >>>> Reflect.set(obj, 'a0', 2) >>>> }) >>>> .add('obj#key=', () => { >>>> /* eslint dot-notation: 0 */ >>>> obj['a0'] = 2 >>>> }) >>>> .on('cycle', event => { >>>> console.log(String(event.target)) >>>> }) >>>> .on('complete', function () { >>>> console.log('Fastest is ' + this.filter('fastest').map('name')) >>>> }) >>>> .run() >>>> >>>> Results >>>> >>>> delegates#getter x 2,414,206 ops/sec ±0.81% (83 runs sampled) >>>> delegateProxy#getter x 1,383,270 ops/sec ±0.94% (84 runs sampled) >>>> Fastest is delegates#getter >>>> delegates#method x 4,707,516 ops/sec ±6.25% (53 runs sampled) >>>> delegateProxy#method x 1,339,755 ops/sec ±6.93% (65 runs sampled) >>>> Fastest is delegates#method >>>> delegates#access x 2,427,859 ops/sec ±8.88% (67 runs sampled) >>>> delegateProxy#access x 1,344,403 ops/sec ±10.72% (47 runs sampled) >>>> Fastest is delegates#access >>>> Reflect#get x 7,481,142 ops/sec ±2.35% (82 runs sampled) >>>> obj#key x 35,676,972 ops/sec ±0.73% (83 runs sampled) >>>> obj.key x 35,687,692 ops/sec ±0.65% (82 runs sampled) >>>> Fastest is obj.key,obj#key >>>> Reflect#has x 8,369,451 ops/sec ±4.04% (77 runs sampled) >>>> key in d0 x 10,618,353 ops/sec ±7.39% (51 runs sampled) >>>> Fastest is key in d0 >>>> Reflect#set x 6,356,287 ops/sec ±7.22% (56 runs sampled) >>>> obj#key= x 32,970,782 ops/sec ±1.74% (82 runs sampled) >>>> Fastest is obj#key= >>>> >>>> -- >>> -- >>> v8-users mailing list >>> v8-u...@googlegroups.com <javascript:> >>> http://groups.google.com/group/v8-users >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "v8-users" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to v8-users+u...@googlegroups.com <javascript:>. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- >> -- >> v8-users mailing list >> v8-u...@googlegroups.com <javascript:> >> http://groups.google.com/group/v8-users >> --- >> You received this message because you are subscribed to the Google Groups >> "v8-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to v8-users+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > >
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