Measuring memory usage of executable run using golang

Question

How do I measure the amount of memory used by an executable which I run through the os/exec package in Golang? Is it better to do this through the OS itself?

Real-time or post-execution? /usr/bin/time -f "%M" ls could be used if you want the result. — Martin Gallagher
– Martin Gallagher, Commented Dec 23, 2014 at 18:17

Mr_Pink · Accepted Answer · 2014-12-23 21:51:30Z

12

You need to do this through the OS itself. If you are on plan9 or posix, Go will return the usage values from the OS for you in the structure returned by ProcessState.SysUsage().

cmd := exec.Command("command", "arg1", "arg2")
err := cmd.Run()
if err != nil {
    log.Fatal(err)
}
// check this type assertion to avoid a panic
fmt.Println("MaxRSS:", cmd.ProcessState.SysUsage().(*syscall.Rusage).Maxrss)

Note: different platforms may return this in bytes or kilobytes. Check man getrusage for details.

edited Dec 23, 2014 at 21:51

answered Dec 23, 2014 at 21:43

Mr_Pink

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2 Comments

Kevin Bullaughey Over a year ago

Any thoughts on a real-time solution? i.e., before the process has existed. I think cmd.ProcessState is only available after the program has terminated.

Mr_Pink Over a year ago

@KevinBullaughey: see stackoverflow.com/questions/31879817/…. Everything is available in /proc/$PID/smaps

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