pprof.Lookup("heap").WriteTo(some_file, 2)

import (
  "runtime"
  "runtime/pprof"
)
…
// Debug: pprof.WriteHeapProfile()
        memprofile := "/run/dnsd/memprofile"
        f, _ := os.Create(memprofile)
        runtime.GC() // get up-to-date statistics
        pprof.WriteHeapProfile(f)
        f.Close()
…
// Debug: pprof http listener
//  go http.ListenAndServe("localhost:8080", nil)

# go tool pprof -nodefraction=0 -inuse_objects memprofile.3+
File: dnsd
Type: inuse_objects
Time: Dec 24, 2020 at 10:38am (MSK)
Entering interactive mode (type "help" for commands, "o" for options)
(pprof) top
Showing nodes accounting for 19387, 100% of 19387 total
Showing top 10 nodes out of 32
      flat  flat%   sum%        cum   cum%
     10923 56.34% 56.34%      10923 56.34%  main.apiCall.func1
      8192 42.26% 98.60%       8192 42.26%  regexp.mergeRuneSets.func2
       256  1.32% 99.92%        256  1.32%  bufio.NewWriterSize
        16 0.083%   100%         16 0.083%  compress/flate.(*dictDecoder).init

// To complete report processing even after return on timeout
  go func () {
    defer report.DelNotifier(commands.UUID)
    signals := make(chan os.Signal, 1)
    signal.Notify(signals, syscall.SIGHUP, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM)
    for {
      select {
      case index := <-callback:
        if (index + 1) >= len(Workers) {
          done <- struct{}{}
          return
        }
      case t:= <- timer: // t++ on each tick, t=-1 at the end
        if t > 0 {
          xl.Warn("apiCall: Timer tick while still not enough reports from workers!")
        }
        if t < 0 { // Time is over
          xl.Err("apiCall: Time over while still not enough reports from workers!")
          err = fmt.Errorf("Time over")
          done <- struct{}{}
          return
        }
      case exitSignal = <-signals:
        xl.Warnf("apiCall: Interrupt is detected: %s", exitSignal)
        xl.Warn("apiCall: Waiting for timeout to complete report processing...")
        err = fmt.Errorf("Interrupt")
        done <- struct{}{}
        return
      }
    }
  } ()

go func (uuid string) {
…
} (commands.UUID)

signal.Notify(signals, syscall.SIGHUP, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM)

defer signal.Stop(signals)

# go tool pprof -nodefraction=0 -inuse_objects memprofile.1
File: dnsd
Type: inuse_objects
Time: Dec 25, 2020 at 11:56am (MSK)
No samples were found with the default sample value type.
Try "sample_index" command to analyze different sample values.
Entering interactive mode (type "help" for commands, "o" for options)
(pprof) top
Showing nodes accounting for 0, 0% of 0 total
      flat  flat%   sum%        cum   cum%