goprofile graphs

each100ms.go

memstats := cmd.Flag.Lookup("memstats").Value.String()
if memstats != "" {
    interval := cmd.Flag.Lookup("meminterval").Value.Get().(time.Duration)

    context.fileMemStats, err = os.Create(memstats)
    if err != nil {
        return err
    }

    context.fileMemStats.WriteString("# Time\tHeapSys\tHeapAlloc\tHeapIdle\tHeapReleased\n")

    go func() {
        var stats runtime.MemStats

        start := time.Now().UnixNano()

        for {
            runtime.ReadMemStats(&stats)
            if context.fileMemStats != nil {
                context.fileMemStats.WriteString(fmt.Sprintf("%d\t%d\t%d\t%d\t%d\n",
                    (time.Now().UnixNano()-start)/1000000, stats.HeapSys, stats.HeapAlloc, stats.HeapIdle, stats.HeapReleased))
                time.Sleep(interval)
            } else {
                break
            }
        }
    }()
}

gistfile1.txt

set output 'mem.png'
set term png
set key box left
set xlabel "Time (msec)"
set ylabel "Mem (MB)"
plot "mem.dat" using 1:($2/1e6) title 'HeapSys' with lines, "mem.dat" using 1:($3/1e6) title 'HeapAlloc' with lines, "mem.dat" using 1:($4/1e6) title 'HeapIdle' with lines