Thread pool vs synchronous performance example (for your information)

[qpwo]

Hope this is of some use to you! The threads broke even at 10000000 and beyond that did much better than synchronous

// random-number-sum-performance-test.js
const { performance } = require('perf_hooks')

const { StaticPool } = require('node-worker-threads-pool')

let n = 1
async function main() {
    n = 1
    for (let exponent = 0; exponent < 9; exponent++) {
        n *= 10
        console.log(`--- n=${n}: ---`)
        await time(withPool)
        await time(nothingFancy)
    }
}
main()

async function withPool() {
    const staticPool = new StaticPool({
        size: 4,
        task: n => {
            let total = 0
            for (let i = 0; i < n; i++) total += Math.random()
            return total
        },
    })

    const total = (await Promise.all([1, 2, 3, 4].map(() => staticPool.exec(n)))).reduce((a, b) => a + b)
    return total
}

function nothingFancy() {
    let total = 0
    const m = n * 4
    for (let i = 0; i < m; i++) total += Math.random()
    return total
}

async function time(f) {
    const t1 = performance.now()
    const result = await f()
    const t2 = performance.now()
    console.log(`${f.name} took ${t2 - t1} to get ${result}`)
}

Results:

--- n=10: ---
withPool took 53.835896998643875 to get 19.930073961113138
nothingFancy took 0.06096699833869934 to get 16.237419498424664
--- n=100: ---
withPool took 53.99462300539017 to get 191.49533349250487
nothingFancy took 0.027156993746757507 to get 204.45374014731104
--- n=1000: ---
withPool took 50.01943700015545 to get 2004.4566054103996
nothingFancy took 0.9318670034408569 to get 2015.9208923115145
--- n=10000: ---
withPool took 48.72436600923538 to get 20007.1920261762
nothingFancy took 2.4409569948911667 to get 20012.901073635243
--- n=100000: ---
withPool took 54.470831006765366 to get 200086.70983438176
nothingFancy took 5.684918999671936 to get 199998.26497395104
--- n=1000000: ---
withPool took 66.65430599451065 to get 2001061.973088672
nothingFancy took 43.69860699772835 to get 1999745.198802261
--- n=10000000: ---
withPool took 172.60957700014114 to get 19998626.755245283
nothingFancy took 377.86564199626446 to get 20002634.54283542
--- n=100000000: ---
withPool took 1268.5459830015898 to get 199999921.15196624
nothingFancy took 4249.29148799181 to get 200004158.20174262
--- n=1000000000: ---
withPool took 12684.676231995225 to get 1999962044.2081757
nothingFancy took 49840.80099800229 to get 1999954981.8320045

[zhangtiecheng1108]

task 中可不可以使用nestjs中的service