external-repos/squoosh
1
0
Fork 1
mirror of https://github.com/GoogleChromeLabs/squoosh.git synced 2025-11-12 00:37:19 +00:00
Code Issues Packages Projects Releases Wiki Activity

Benchmark all rotations

Browse Source
This commit is contained in:
Surma
2019-02-15 19:51:13 +01:00
parent db20f10bd2
commit ab58df4c2c
1 changed files with 24 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
codecs/rotate/benchmark.js
View File

@@ -14,24 +14,32 @@ async function init() {
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);
} }
[0, 90, 180, 270].forEach(rotation => {
print(`\n${rotation} degrees`);
print(`==============================`);
for (let i = 0; i < 100; i++) { for (let i = 0; i < 100; i++) {
const start = Date.now(); const start = Date.now();
instance.exports.rotate(imageDimensions, imageDimensions, 90); instance.exports.rotate(imageDimensions, imageDimensions, rotation);
iterations[i] = Date.now() - start; iterations[i] = Date.now() - start;
} }
const average = iterations.reduce((sum, c) => sum + c) / iterations.length; 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)) .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(`n = ${iterations.length}`);
print(`Average: ${average}`) print(`Average: ${average}`);
print(`StdDev: ${stddev}`); print(`StdDev: ${stddev}`);
});
} }
init().catch(e => console.error(e.stack)); init().catch(e => console.error(e.stack));