mirror of
https://github.com/GoogleChromeLabs/squoosh.git
synced 2025-11-12 16:57:26 +00:00
38 lines
1.4 KiB
JavaScript
38 lines
1.4 KiB
JavaScript
// 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. Don’t 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)
|
||
}
|
||
|
||
for(let i = 0; i < 100; i++) {
|
||
const start = Date.now();
|
||
instance.exports.rotate(imageDimensions, imageDimensions, 90);
|
||
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));
|