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Benchmark all rotations

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Surma
2019-02-15 19:51:13 +01:00
parent db20f10bd2
commit ab58df4c2c
1 changed files with 24 additions and 16 deletions
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40
codecs/rotate/benchmark.js
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@@ -12,26 +12,34 @@ async function init() {
const wasmPageSize = 64 * 1024; const wasmPageSize = 64 * 1024;
const buffer = readbuffer("rotate.wasm"); const buffer = readbuffer("rotate.wasm");
const {instance} = await WebAssembly.instantiate(buffer); const { instance } = await WebAssembly.instantiate(buffer);
const pagesAvailable = Math.floor(instance.exports.memory.buffer.byteLength / wasmPageSize); const pagesAvailable = Math.floor(
instance.exports.memory.buffer.byteLength / wasmPageSize
);
const pagesNeeded = Math.floor((imageByteSize * 2 + 4) / wasmPageSize) + 1; const pagesNeeded = Math.floor((imageByteSize * 2 + 4) / wasmPageSize) + 1;
const additionalPagesNeeded = pagesNeeded - pagesAvailable; const additionalPagesNeeded = pagesNeeded - pagesAvailable;
if(additionalPagesNeeded > 0) { if (additionalPagesNeeded > 0) {
instance.exports.memory.grow(additionalPagesNeeded) instance.exports.memory.grow(additionalPagesNeeded);
} }
for(let i = 0; i < 100; i++) { [0, 90, 180, 270].forEach(rotation => {
const start = Date.now(); print(`\n${rotation} degrees`);
instance.exports.rotate(imageDimensions, imageDimensions, 90); print(`==============================`);
iterations[i] = Date.now() - start; for (let i = 0; i < 100; i++) {
} const start = Date.now();
const average = iterations.reduce((sum, c) => sum + c) / iterations.length; instance.exports.rotate(imageDimensions, imageDimensions, rotation);
const stddev = Math.sqrt(iterations iterations[i] = Date.now() - start;
.map(i => Math.pow(i - average, 2)) }
.reduce((sum, c) => sum + c) / iterations.length); const average = iterations.reduce((sum, c) => sum + c) / iterations.length;
print(`n = ${iterations.length}`); const stddev = Math.sqrt(
print(`Average: ${average}`) iterations
print(`StdDev: ${stddev}`); .map(i => Math.pow(i - average, 2))
.reduce((sum, c) => sum + c) / iterations.length
);
print(`n = ${iterations.length}`);
print(`Average: ${average}`);
print(`StdDev: ${stddev}`);
});
} }
init().catch(e => console.error(e.stack)); init().catch(e => console.error(e.stack));