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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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26
codecs/rotate/benchmark.js
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@@ -12,26 +12,34 @@ async function init() {
const wasmPageSize = 64 * 1024;
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 additionalPagesNeeded = pagesNeeded - pagesAvailable;
if(additionalPagesNeeded > 0) {
instance.exports.memory.grow(additionalPagesNeeded)
if (additionalPagesNeeded > 0) {
instance.exports.memory.grow(additionalPagesNeeded);
}
for(let i = 0; i < 100; i++) {
[0, 90, 180, 270].forEach(rotation => {
print(`\n${rotation} degrees`);
print(`==============================`);
for (let i = 0; i < 100; i++) {
const start = Date.now();
instance.exports.rotate(imageDimensions, imageDimensions, 90);
instance.exports.rotate(imageDimensions, imageDimensions, rotation);
iterations[i] = Date.now() - start;
}
const average = iterations.reduce((sum, c) => sum + c) / iterations.length;
const stddev = Math.sqrt(iterations
const stddev = Math.sqrt(
iterations
.map(i => Math.pow(i - average, 2))
.reduce((sum, c) => sum + c) / iterations.length);
.reduce((sum, c) => sum + c) / iterations.length
);
print(`n = ${iterations.length}`);
print(`Average: ${average}`)
print(`Average: ${average}`);
print(`StdDev: ${stddev}`);
});
}
init().catch(e => console.error(e.stack));