node在执行IO操作(读取文件)时会开启线程池(默认是4个),咱们能够通过设置UV_THREADPOOL_SIZE减少线程池个数。
背景:
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title></head><body> </body></html>const fs = require("fs");process.env.UV_THREADPOOL_SIZE=64;setInterval(() => { fs.readFile(`${__dirname}/index.html`,()=>{ console.log("read success"); })}, 3000);{ "name": "threadpool", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1", "start":"node index.js" }, "keywords": [], "author": "", "license": "ISC"}在windows下运行node,发现process.env.UV_THREADPOOL_SIZE设置有效。
线程数量应该从12减少到76个,理论为16个,阐明UV_THREADPOOL_SIZE设置有效
起因:
Linux零碎下能够在js代码里间接设置,而windows零碎下须要在执行node命令前设置线程池数量,将node启动改为如下图(注:=号左右不要有空格)
运行后果: