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Performance.html
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Performance.html
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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Performance</title>
<script src="https://cdn.jsdelivr.net/npm/@assemblyscript/loader/umd/index.js"></script>
</head>
<body>
<script>
const memory = new WebAssembly.Memory({
initial: 64,
});
let t;
let wasmCallJsCostSum;
let JsCallCostSum;
let module;
loader
.instantiate(
fetch('./build/performance.wasm').then(i => i.arrayBuffer()),
{
env: { memory },
performance: {
output(arg) {
// console.log(arg);
wasmCallJsCostSum += performance.now() - t;
},
outputStr(str) {
// 有bug了，declare function不支持字符串么??不应该。。
// 不支持从js转发string ?? 如果改为实际的as内产生的字符串是支持的
// console.log(module.__getString(str), str);
module.__getString(str);
wasmCallJsCostSum += performance.now() - t;
},
outputTypedArray(arrayPtr) {
// console.log(arrayPtr);
// console.log(module.__getUint8Array(arrayPtr), arrayPtr);
module.__getUint8Array(arrayPtr);
wasmCallJsCostSum += performance.now() - t;
},
},
},
)
.then(mod => {
const { exports } = mod;
console.log(exports);
module = exports;
const loopCount = 1_000_000;
console.warn('test num');
{
wasmCallJsCostSum = 0;
for (let i = 0; i < loopCount; i++) {
t = performance.now();
exports.input(i);
}
console.log('wasm cost sum', wasmCallJsCostSum);
JsCallCostSum = 0;
function output() {
JsCallCostSum += performance.now() - t;
}
function input(i) {
output(i);
}
for (let i = 0; i < loopCount; i++) {
t = performance.now();
input(i);
}
console.log('js cost sum', JsCallCostSum);
console.log('diff', wasmCallJsCostSum / JsCallCostSum);
/**
* | browser | wasm | js | diff |
* |---------|------|-----|------|
* | chrome | 509 | 499 | 2.1% |
* | edge | 318 | 311 | 2.4% |
* | firefox | 113 | 89 | 27% |
*/
}
console.warn('test str');
{
wasmCallJsCostSum = 0;
for (let i = 0; i < loopCount; i++) {
t = performance.now();
const outString = exports.inputString('test string');
exports.__getString(outString);
}
console.log('wasm cost sum', wasmCallJsCostSum);
JsCallCostSum = 0;
function output() {
JsCallCostSum += performance.now() - t;
}
function input(i) {
output('input string');
return 'return string';
}
for (let i = 0; i < loopCount; i++) {
t = performance.now();
input('test string');
}
console.log('js cost sum', JsCallCostSum);
console.log('diff', wasmCallJsCostSum / JsCallCostSum);
/**
* | browser | wasm | js | diff |
* |---------|------|-----|------|
* | chrome | 1436 | 561 | 255% |
* | edge | 973 | 289 | 335% |
* | firefox | 993 | 107 | 928% |
*/
}
console.warn('test Uint8Array');
{
wasmCallJsCostSum = 0;
for (let i = 0; i < loopCount; i++) {
t = performance.now();
const arrayPtr = exports.__newArray(
exports.Uint8Array_ID.value,
new Uint8Array([1, 2, 3]),
);
const outArray = exports.intputTypedArray(arrayPtr);
exports.__getUint8Array(outArray);
}
console.log('wasm cost sum', wasmCallJsCostSum);
JsCallCostSum = 0;
function output() {
JsCallCostSum += performance.now() - t;
}
function input(i) {
const u8Array = new Uint8Array(3);
u8Array[0] = i[2];
u8Array[1] = i[1];
u8Array[2] = i[0];
output(u8Array);
return u8Array;
}
for (let i = 0; i < loopCount; i++) {
t = performance.now();
input(new Uint8Array([1, 2, 3]));
}
console.log('js cost sum', JsCallCostSum);
console.log('diff', wasmCallJsCostSum / JsCallCostSum);
/**
* | browser | wasm | js | diff |
* |---------|------|-----|------|
* | chrome | 2336 | 743 | 314% |
* | edge | 1200 | 440 | 272% |
* | firefox | 1882 | 195 | 965% |
*/
}
});
</script>
</body>
</html>