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-rw-r--r--profiling.go95
1 files changed, 95 insertions, 0 deletions
diff --git a/profiling.go b/profiling.go
new file mode 100644
index 0000000..11d6326
--- /dev/null
+++ b/profiling.go
@@ -0,0 +1,95 @@
+package main
+
+import (
+ "os"
+ "runtime/pprof"
+ "runtime/trace"
+ "time"
+
+ "github.com/rfjakob/gocryptfs/internal/exitcodes"
+ "github.com/rfjakob/gocryptfs/internal/tlog"
+)
+
+// setupCpuprofile is called to handle a non-empty "-cpuprofile" cli argument
+func setupCpuprofile(cpuprofileArg string) func() {
+ tlog.Info.Printf("Writing CPU profile to %s", cpuprofileArg)
+ f, err := os.Create(cpuprofileArg)
+ if err != nil {
+ tlog.Fatal.Println(err)
+ os.Exit(exitcodes.Profiler)
+ }
+ err = pprof.StartCPUProfile(f)
+ if err != nil {
+ tlog.Fatal.Println(err)
+ os.Exit(exitcodes.Profiler)
+ }
+ return func() {
+ pprof.StopCPUProfile()
+ }
+}
+
+// setupTrace is called to handle a non-empty "-memprofile" cli argument
+func setupMemprofile(memprofileArg string) func() {
+ tlog.Info.Printf("Will write memory profile to %q", memprofileArg)
+ f, err := os.Create(memprofileArg)
+ if err != nil {
+ tlog.Fatal.Println(err)
+ os.Exit(exitcodes.Profiler)
+ }
+ exiting := false
+ // Write the memory profile to disk every 60 seconds to get the in-use
+ // memory stats.
+ go func() {
+ for {
+ time.Sleep(60 * time.Second)
+ if exiting {
+ return
+ }
+ _, err = f.Seek(0, 0)
+ if err != nil {
+ tlog.Warn.Printf("memprofile: Seek failed: %v", err)
+ return
+ }
+ err = f.Truncate(0)
+ if err != nil {
+ tlog.Warn.Printf("memprofile: Truncate failed: %v", err)
+ return
+ }
+ err = pprof.WriteHeapProfile(f)
+ if err == nil {
+ tlog.Info.Printf("memprofile: periodic write to %q succeeded",
+ memprofileArg)
+ } else {
+ tlog.Warn.Printf("memprofile: periodic WriteHeapProfile failed: %v", err)
+ return
+ }
+ }
+ }()
+ // Final write on exit.
+ return func() {
+ exiting = true
+ err = pprof.WriteHeapProfile(f)
+ if err != nil {
+ tlog.Warn.Printf("memprofile: on-exit WriteHeapProfile failed: %v", err)
+ }
+ f.Close()
+ }
+}
+
+// setupTrace is called to handle a non-empty "-trace" cli argument
+func setupTrace(traceArg string) func() {
+ tlog.Info.Printf("Writing execution trace to %s", traceArg)
+ f, err := os.Create(traceArg)
+ if err != nil {
+ tlog.Fatal.Println(err)
+ os.Exit(exitcodes.Profiler)
+ }
+ err = trace.Start(f)
+ if err != nil {
+ tlog.Fatal.Println(err)
+ os.Exit(exitcodes.Profiler)
+ }
+ return func() {
+ trace.Stop()
+ }
+}