Hello SharedArrayBuffer / Fil | Observable

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Edited

Sep 13, 2021

3 stars

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Hello SharedArrayBuffer

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sharedBuffer = new SharedArrayBuffer(Int32Array.BYTES_PER_ELEMENT * 1e7) // 4 bytes per item in a Float32Array

import {worker} from "@fil/worker"

C = navigator.hardwareConcurrency || 4

runWorkers = {

launchWorkers;

const seed = Math.random(),

time = performance.now();

await Promise.all(

Array.from(

{ length: C },

(_, start) =>

new Promise(notify =>

worker(compute, { seed, sharedBuffer, start, n: 1000, C })(notify)

)

)

);

return performance.now() - time;

}

(runWorkers, new Float32Array(sharedBuffer))

function compute(options) {

const sharedArray = new Float32Array(options.sharedBuffer),

n = options.n || 1000,

C = navigator.hardwareConcurrency || 4;

for (let i = options.start; i < sharedArray.length; i += C) {

for (

let a = 0;

a < n;

a++ // make it slow :D

)

sharedArray[i] = Math.cos(i / 100 + options.seed);

}

return "anything"; // a message saying we're done

}

normal = {

if (!launchNormal) return;

const seed = Math.random(),

time = performance.now();

for (let start = 0; start < C; start++)

compute({ seed, sharedBuffer, start, n: 1000, C });

return performance.now() - time;

}

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