multithreading - Why does it not create many threads when many goroutines are blocked in writing file in golang?

Question

As we know in go, a thread may be created when the goroutine has to perform a blocking call, such as a system call, or a call to a C library via cgo. Some test code:

   package main

   import (
        "io/ioutil"
        "os"
        "runtime"
        "strconv"
    )

    func main() {
        runtime.GOMAXPROCS(2)
        data, err := ioutil.ReadFile("./55555.log")
        if err != nil {
            println(err)
            return
        }
        for i := 0; i < 200; i++ {
            go func(n int) {
                for {
                    err := ioutil.WriteFile("testxxx"+strconv.Itoa(n), []byte(data), os.ModePerm)
                    if err != nil {
                        println(err)
                        break
                    }
                }
            }(i)
        }
        select {}
    }

When I run it, it didn't create many threads.

? =99=[root /root]$ cat /proc/9616/status | grep -i thread
Threads:    5

Any ideas?

Answer 1

Waitting for answers