Con raras excepciones ( uno , dos << el original tiene un formato peor, IMO ), los artículos sobre "creación de perfiles" en golang son una reimpresión de la anotación del paquete pprof (ni siquiera este artículo antiguo ) y luego una pequeña experiencia personal sobre cómo (no) se logró con la ayuda pprof encuentra el problema.
, "" . - / , , () . " ", .
: "" - "". ( , .) ( ) " ", ( " ") 20+.
" " - " ". ( ) . , "", "". , " " . "". " " .
. , , ( ) "" go. - , goroutines …
, - ́ "pprof.WriteHeapProfile()". : " " "" 512. ( "").
"́ ": "WriteTo()" "" "debug=2":
pprof.Lookup("heap").WriteTo(some_file, 2)
pprof, . , " " .
, "net/http/pprof" curl/wget. , : "http.ListenAndServe()" , . .. "ListenAndServe()" . "go …" goroutine.
pprof ( ). .
1. HeapProfile
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)
, . — curl.
2.
( 512 4…6 ), 99% .
goroutine "main.apiCall.func1()" 10923 "". (, .. "" 512 . - …)
# 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
3. /
:
// 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
}
}
} ()
4.
, "" "commands.UUID" (commands "" ). , .. "" defer. , . - . - :
go func (uuid string) {
…
} (commands.UUID)
SIGKILL (""), . , - - .
, "". - ? :
signal.Notify(signals, syscall.SIGHUP, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM)
, "defer report.DelNotifier()" . "signal.Notify()" , . , "os.Signal" " " . . , , " ".
, , " ". "" , "" — .
5. Happy end
:
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%
() . . " " .
.
, "" ( ""). () , .. "" ( "" ).
golang, , " ". ( ) :
. ( " ") "", . — …
"" goroutine ( "" ).
"defer …" ( - goroutine, ).
"" ( "signal.Notify()") .
go1.14. 1.8. 1.8 30 . .
Tuve que abstenerme de intentar go1.15. Porque los hipsters que entraron a escondidas rompieron el soporte X.509 "CommonName" al verificar certificados. (Tradicionalmente) sin saber que además de la Internet pública hay todo tipo de segmentos "cerrados", con grandes retrasos para realizar cambios.
Así que eso es todo.
La crítica constructiva y señalar con el dedo "¿dónde soy un tonto?" Es bienvenida.
¡Aprovechando esta oportunidad, todos con el próximo año 2021!