英文:
Golang os/exec, realtime memory usage
问题
我正在使用Linux、Go和os/exec来运行一些命令。
我想知道一个进程的实时内存使用情况。这意味着我可以在启动进程后随时询问内存使用情况，而不仅仅是在它运行后。
（这就是为什么https://stackoverflow.com/questions/27625787/measuring-memory-usage-of-executable-run-using-golang中的答案对我来说不是一个选择）
例如：
cmd := exec.Command(...)cmd.Start()//...if cmd.Memory() > 50 {fmt.Println("哦，天哪，这个进程对内存的需求很大！")}
我不需要非常精确的值，但如果误差范围低于10兆字节，那就太好了。
有没有一种Go的方法可以做到这一点，还是我需要某种命令行的技巧？
英文:
I'm using Linux, go, and os/exec to run some commands.
I want to know a process' realtime memory usage. That means that I can ask for memory usage anytime after I start the process, not just after it ran.
(That's why the answer in https://stackoverflow.com/questions/27625787/measuring-memory-usage-of-executable-run-using-golang is not an option for me)
For example:
cmd := exec.Command(...)cmd.Start()//...if cmd.Memory()>50 {fmt.Println("Oh my god, this process is hungry for memory!")}
I don't need very precise value, but it would be great if it's error range is lower than, say, 10 megabytes.
Is there a go way to do that or I need some kind of command line trick?
答案1
得分: 7
这是我在Linux上使用的代码：
func calculateMemory(pid int) (uint64, error) {f, err := os.Open(fmt.Sprintf("/proc/%d/smaps", pid))if err != nil {return 0, err}defer f.Close()res := uint64(0)pfx := []byte("Pss:")r := bufio.NewScanner(f)for r.Scan() {line := r.Bytes()if bytes.HasPrefix(line, pfx) {var size uint64_, err := fmt.Sscanf(string(line[4:]), "%d", &size)if err != nil {return 0, err}res += size}}if err := r.Err(); err != nil {return 0, err}return res, nil}
这个函数返回给定PID的PSS（比例设置大小），以KB为单位。如果你刚刚启动了进程，你应该有权限访问相应的/proc文件。
在内核版本3.0.13上进行了测试。
英文:
Here is what I use on Linux:
func calculateMemory(pid int) (uint64, error) {f, err := os.Open(fmt.Sprintf("/proc/%d/smaps", pid))if err != nil {return 0, err}defer f.Close()res := uint64(0)pfx := []byte("Pss:")r := bufio.NewScanner(f)for r.Scan() {line := r.Bytes()if bytes.HasPrefix(line, pfx) {var size uint64_, err := fmt.Sscanf(string(line[4:]), "%d", &size)if err != nil {return 0, err}res += size}}if err := r.Err(); err != nil {return 0, err}return res, nil}
This function returns the PSS (Proportional Set Size) for a given PID, expressed in KB. If you have just started the process, you should have the rights to access the corresponding /proc file.
Tested with kernel 3.0.13.
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