The golang process cannot be killed

In the process of writing programs using Golang, it is very common to encounter the problem that the process cannot be killed. This could be because there are some huge loops in the program or issues with signals not being handled correctly. In this article, we will introduce how to diagnose and solve the problem that the Golang process cannot be killed.

1. View process dependencies

Before trying to kill a process, we need to confirm that its child processes have been terminated correctly. If the child process is not terminated correctly, the main process cannot exit completely. We can use a command similar to ps axf to view the tree dependencies of a process.

2. Confirm that the signal has been delivered

In Golang, we can use the Signal() function in the os package to send signals. But if the signal is not delivered correctly, the process will not end. We can test whether the program responds to the signal correctly by adding the os.Interrupt signal to the program.

3. Check if there is an infinite loop

An infinite loop is a common reason why the process cannot be terminated. If you have an infinite loop in your program, you can use a tool like pprof to see what's going on. You can start pprof using the following code:

import _ "net/http/pprof"
import "net/http"

go http.ListenAndServe("localhost:6060", nil)

After starting the program, you can enter http://localhost:6060/debug/pprof/ in the browser to view the output of pprof. If your program is stuck in an infinite loop, you will see this information in the output.

4. Properly handle Channel

In Golang, Channel is a very important synchronization mechanism. We need to make sure that our program properly closes all Channels it uses. If a Channel is not closed, our program may block forever. We can use a tool like govet to check that our program has closed all Channels correctly.

5. Check memory leaks

Memory leaks are also a common reason why processes cannot be terminated. If our program is leaking memory, it may keep running until it is killed by the operating system. We can use tools like pprof to diagnose memory leaks. You can start pprof using the following code:

import _ "net/http/pprof"
import "net/http"

go http.ListenAndServe("localhost:6060", nil)

After starting the program, you can enter http://localhost:6060/debug/pprof/ in the browser to view the output of pprof. If your program is leaking memory, you will see this information in the output.

6. Use debug tools

In Golang, we can use the built-in debug tools to help us diagnose and solve problems. There are several tools that can help us view goroutines, memory usage, and CPU usage. You can use the following code to start the debugging tool:

import _ "runtime/pprof"

func main() {
    f, _ := os.Create("profile")
    defer f.Close()

    pprof.StartCPUProfile(f)
    defer pprof.StopCPUProfile()

    // do something
}

While the program is running, you can use the go tool pprof command to view the generated profile file.

Summary

When using Golang to develop programs, we need to carefully handle some common problems, such as infinite loops, Channel closures, and memory leaks. If our program does not handle these issues correctly, it may keep running until it is killed by the operating system. By using the above techniques and tools, we can better diagnose and solve the problem that the Golang process cannot be killed.

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