enable profiling for shared libraries

profiling/cpu.go

@@ -1,9 +1,13 @@
 package profiling
 
 import (
+	"fmt"
 	"os"
+	"os/signal"
 	"path/filepath"
 	"runtime/pprof"
+	"syscall"
+	"time"
 )
 
 // CPUFilename is a filename in which the CPU profiling is stored.
@@ -15,8 +19,10 @@ var cpuFile *os.File
 // the profile will be buffered and written to the file in folder dataDir.
 func StartCPUProfile(dataDir string) error {
 	if cpuFile == nil {
+		signal.Notify(make(chan os.Signal), syscall.SIGPROF) // enable profiling for shared libraries
+
 		var err error
-		cpuFile, err = os.Create(filepath.Join(dataDir, CPUFilename))
+		cpuFile, err = os.Create(filepath.Join(dataDir, fmt.Sprintf("status_cpu_%d.prof", time.Now().Unix())))
 		if err != nil {
 			return err
 		}
@@ -31,5 +37,7 @@ func StopCPUProfile() error {
 		return nil
 	}
 	pprof.StopCPUProfile()
-	return cpuFile.Close()
+	err := cpuFile.Close()
+	cpuFile = nil
+	return err
 }