Golang os / exec,实时内存使用情况 [英] Golang os/exec, realtime memory usage
问题描述
我使用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。这意味着我可以在开始流程后随时询问内存使用情况,而不仅仅是在运行后。
(这就是为什么 不是 对于我)
例如:
cmd:= exec。 Command(...)
cmd.Start()
// ...
if cmd.Memory()> 50 {
fmt.Println(Oh my god ,这个过程渴望记忆!)
}
我不需要精确的价值,但是如果误差范围低于10兆字节会很好。
有没有办法做到这一点,或者我需要某种命令行技巧?
以下是我在Linux上使用的内容:
< pre $ func calculateMemory(pid int)(uint64,error){
$ bf,err:= os.Open(fmt.Spri ntf(/ proc /%d / smaps,pid))
if err!= nil {
return 0,err
}
推迟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(如果错误!=零{
return 0,err
}
res + = size
}
}
if err:= r.Err(); err!= nil {
return 0,err
}
return res,nil
}
该函数返回 PSS(比例集合大小),用KB表示。如果您刚开始这个过程,您应该有权访问相应的/ proc文件。
使用内核3.0.13测试。
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 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?
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.
这篇关于Golang os / exec,实时内存使用情况的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!