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?
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Samarth Wahal
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4Real-time or post-execution? `/usr/bin/time -f "%M" ls` could be used if you want the result. – Martin Gallagher Dec 23 '14 at 18:17
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Is there any cross-platform solution for this? – Samarth Wahal Dec 23 '14 at 18:36
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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.
JimB
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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. – Kevin Bullaughey Oct 16 '15 at 19:55
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@KevinBullaughey: see http://stackoverflow.com/questions/31879817/golang-os-exec-realtime-memory-usage. Everything is available in `/proc/$PID/smaps` – JimB Oct 16 '15 at 20:05