46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
// THIS IS NOT A NODE SCRIPT
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// This is a d8 script. Please install jsvu[1] and install v8.
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// Then run `npm run --silent benchmark`.
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// [1]: https://github.com/GoogleChromeLabs/jsvu
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async function init() {
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// Adjustable constants.
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const imageDimensions = 4096;
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const iterations = new Array(100);
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// Constants. Don’t change.
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const imageByteSize = imageDimensions * imageDimensions * 4;
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const wasmPageSize = 64 * 1024;
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const buffer = readbuffer("rotate.wasm");
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const { instance } = await WebAssembly.instantiate(buffer);
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const pagesAvailable = Math.floor(
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instance.exports.memory.buffer.byteLength / wasmPageSize
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);
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const pagesNeeded = Math.floor((imageByteSize * 2 + 4) / wasmPageSize) + 1;
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const additionalPagesNeeded = pagesNeeded - pagesAvailable;
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if (additionalPagesNeeded > 0) {
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instance.exports.memory.grow(additionalPagesNeeded);
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}
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[0, 90, 180, 270].forEach(rotation => {
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print(`\n${rotation} degrees`);
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print(`==============================`);
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for (let i = 0; i < 100; i++) {
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const start = Date.now();
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instance.exports.rotate(imageDimensions, imageDimensions, rotation);
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iterations[i] = Date.now() - start;
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}
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const average = iterations.reduce((sum, c) => sum + c) / iterations.length;
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const stddev = Math.sqrt(
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iterations
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.map(i => Math.pow(i - average, 2))
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.reduce((sum, c) => sum + c) / iterations.length
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);
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print(`n = ${iterations.length}`);
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print(`Average: ${average}`);
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print(`StdDev: ${stddev}`);
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});
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}
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init().catch(e => console.error(e.stack));
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