windows下设置process.env.UV_THREADPOOL_SIZE无效

node在执行IO操作(读取文件)时会开启线程池(默认是4个),我们可以通过设置UV_THREADPOOL_SIZE增加线程池个数。

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设置无效。

线程数量应该从12增加到76个,实际为16个,说明UV_THREADPOOL_SIZE设置无效