cmd/serve: pprof cpu and memory profile dumps to disk (#4560)

modules/pprof/pprof.go

@@ -0,0 +1,42 @@
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pprof
+
+import (
+	"fmt"
+	"io/ioutil"
+	"runtime"
+	"runtime/pprof"
+
+	"code.gitea.io/gitea/modules/log"
+)
+
+// DumpMemProfileForUsername dumps a memory profile at pprofDataPath as memprofile_<username>_<temporary id>
+func DumpMemProfileForUsername(pprofDataPath, username string) {
+	f, err := ioutil.TempFile(pprofDataPath, fmt.Sprintf("memprofile_%s_", username))
+	if err != nil {
+		log.GitLogger.Fatal(4, "Could not create memory profile: %v", err)
+	}
+	defer f.Close()
+	runtime.GC() // get up-to-date statistics
+	if err := pprof.WriteHeapProfile(f); err != nil {
+		log.GitLogger.Fatal(4, "Could not write memory profile: %v", err)
+	}
+}
+
+// DumpCPUProfileForUsername dumps a CPU profile at pprofDataPath as cpuprofile_<username>_<temporary id>
+//  it returns the stop function which stops, writes and closes the CPU profile file
+func DumpCPUProfileForUsername(pprofDataPath, username string) func() {
+	f, err := ioutil.TempFile(pprofDataPath, fmt.Sprintf("cpuprofile_%s_", username))
+	if err != nil {
+		log.GitLogger.Fatal(4, "Could not create cpu profile: %v", err)
+	}
+
+	pprof.StartCPUProfile(f)
+	return func() {
+		pprof.StopCPUProfile()
+		f.Close()
+	}
+}

modules/setting/setting.go

@@ -111,6 +111,7 @@ var (
 	LandingPageURL       LandingPage
 	UnixSocketPermission uint32
 	EnablePprof          bool
+	PprofDataPath        string
 
 	SSH = struct {
 		Disabled             bool           `ini:"DISABLE_SSH"`
@@ -775,6 +776,10 @@ func NewContext() {
 	AppDataPath = sec.Key("APP_DATA_PATH").MustString(path.Join(AppWorkPath, "data"))
 	EnableGzip = sec.Key("ENABLE_GZIP").MustBool()
 	EnablePprof = sec.Key("ENABLE_PPROF").MustBool(false)
+	PprofDataPath = sec.Key("PPROF_DATA_PATH").MustString(path.Join(AppWorkPath, "data/tmp/pprof"))
+	if !filepath.IsAbs(PprofDataPath) {
+		PprofDataPath = filepath.Join(AppWorkPath, PprofDataPath)
+	}
 
 	switch sec.Key("LANDING_PAGE").MustString("home") {
 	case "explore":