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squoosh/codecs/rotate/benchmark.js
2019-02-21 15:16:22 +00:00

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// THIS IS NOT A NODE SCRIPT
// This is a d8 script. Please install jsvu[1] and install v8.
// Then run `npm run --silent benchmark`.
// [1]: https://github.com/GoogleChromeLabs/jsvu
async function init() {
// Adjustable constants.
const imageDimensions = 4096;
const iterations = new Array(100);
// Constants. Dont change.
const imageByteSize = imageDimensions * imageDimensions * 4;
const wasmPageSize = 64 * 1024;
const buffer = readbuffer("rotate.wasm");
const { instance } = await WebAssembly.instantiate(buffer);
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);
}
[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, rotation);
iterations[i] = Date.now() - start;
}
const average = iterations.reduce((sum, c) => sum + c) / iterations.length;
const stddev = Math.sqrt(
iterations
.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));