syncthing/cmd/stbench/main.go

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// Copyright (C) 2016 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
// This doesn't build on Windows due to the Rusage stuff.
// +build !windows
package main
import (
"flag"
"fmt"
"log"
"runtime"
"syscall"
"time"
"github.com/syncthing/syncthing/lib/rc"
)
var homeDir = "h1"
var syncthingBin = "./bin/syncthing"
var test = "scan"
func main() {
flag.StringVar(&homeDir, "home", homeDir, "Home directory location")
flag.StringVar(&syncthingBin, "bin", syncthingBin, "Binary location")
flag.StringVar(&test, "test", test, "Test to run")
flag.Parse()
switch test {
case "scan":
// scan measures the resource usage required to perform the initial
// scan, without cleaning away the database first.
testScan()
}
}
// testScan starts a process and reports on the resource usage required to
// perform the initial scan.
func testScan() {
log.Println("Starting...")
p := rc.NewProcess("127.0.0.1:8081")
if err := p.Start(syncthingBin, "-home", homeDir, "-no-browser"); err != nil {
log.Println(err)
return
}
defer p.Stop()
wallTime := awaitScanComplete(p)
report(p, wallTime)
}
// awaitScanComplete waits for a folder to transition idle->scanning and
// then scanning->idle and returns the time taken for the scan.
func awaitScanComplete(p *rc.Process) time.Duration {
log.Println("Awaiting scan completion...")
var t0, t1 time.Time
lastEvent := 0
loop:
for {
evs, err := p.Events(lastEvent)
if err != nil {
continue
}
for _, ev := range evs {
if ev.Type == "StateChanged" {
data := ev.Data.(map[string]interface{})
log.Println(ev)
if data["to"].(string) == "scanning" {
t0 = ev.Time
continue
}
if !t0.IsZero() && data["to"].(string) == "idle" {
t1 = ev.Time
break loop
}
}
lastEvent = ev.ID
}
time.Sleep(250 * time.Millisecond)
}
return t1.Sub(t0)
}
// report stops the given process and reports on its resource usage in two
// ways: human readable to stderr, and CSV to stdout.
func report(p *rc.Process, wallTime time.Duration) {
sv, err := p.SystemVersion()
if err != nil {
log.Println(err)
return
}
ss, err := p.SystemStatus()
if err != nil {
log.Println(err)
return
}
proc, err := p.Stop()
if err != nil {
return
}
rusage, ok := proc.SysUsage().(*syscall.Rusage)
if !ok {
return
}
log.Println("Version:", sv.Version)
log.Println("Alloc:", ss.Alloc/1024, "KiB")
log.Println("Sys:", ss.Sys/1024, "KiB")
log.Println("Goroutines:", ss.Goroutines)
log.Println("Wall time:", wallTime)
log.Println("Utime:", time.Duration(rusage.Utime.Nano()))
log.Println("Stime:", time.Duration(rusage.Stime.Nano()))
if runtime.GOOS == "darwin" {
// Darwin reports in bytes, Linux seems to report in KiB even
// though the manpage says otherwise.
rusage.Maxrss /= 1024
}
log.Println("MaxRSS:", rusage.Maxrss, "KiB")
fmt.Printf("%s,%d,%d,%d,%.02f,%.02f,%.02f,%d\n",
sv.Version,
ss.Alloc/1024,
ss.Sys/1024,
ss.Goroutines,
wallTime.Seconds(),
time.Duration(rusage.Utime.Nano()).Seconds(),
time.Duration(rusage.Stime.Nano()).Seconds(),
rusage.Maxrss)
}