[NodeJs] Overhead of Promise(async/await) (more serious than you think!)
Language/Javascript 2019.05.16 14:15Just see following test.
Environment
- OS: 4.15.0-47-generic #50-Ubuntu SMP.
- CPU: Intel(R) Xeon(R) CPU E5-2697 v3 @ 2.60GHz
- NodeJs: 10.15.3
Normal
function f() {}
async function main() {
let tm = -Date.now();
for (let i = 0; i < 100000; i++) {
f();
}
tm += Date.now();
console.log(tm);
}
main()$ node test.js
3With operations
function f() {
a = [];
for (let i = 0; i < 30; i++) { a.push(i); }
}
async function main() {
let tm = -Date.now();
for (let i = 0; i < 100000; i++) {
f();
}
tm += Date.now();
console.log(tm);
}
main()
$ node test.js
27With await
function f() {}
async function main() {
let tm = -Date.now();
for (let i = 0; i < 100000; i++) {
await f();
}
tm += Date.now();
console.log(tm);
}
main()$ node test.js
19With async/await
async function f() {}
async function main() {
let tm = -Date.now();
for (let i = 0; i < 100000; i++) {
await f();
}
tm += Date.now();
console.log(tm);
}
main()$ node test.js
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yhcting
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