Add basic counters

.gitignore

@@ -0,0 +1 @@
+containerd/containerd

containerd/daemon.go

@@ -1,14 +1,18 @@
 package main
 
 import (
+	"log"
 	"os"
 	"os/signal"
+	"runtime"
 	"syscall"
+	"time"
 
 	"github.com/Sirupsen/logrus"
 	"github.com/codegangsta/cli"
 	"github.com/crosbymichael/containerd"
 	"github.com/opencontainers/runc/libcontainer/utils"
+	"github.com/rcrowley/go-metrics"
 )
 
 var DaemonCommand = cli.Command{
@@ -26,6 +30,17 @@ var DaemonCommand = cli.Command{
 		},
 	},
 	Action: func(context *cli.Context) {
+		if context.GlobalBool("debug") {
+			l := log.New(os.Stdout, "[containerd] ", log.LstdFlags)
+			goRoutineCounter := metrics.NewMeter()
+			metrics.DefaultRegistry.Register("goroutines", goRoutineCounter)
+			go func() {
+				for range time.Tick(30 * time.Second) {
+					goRoutineCounter.Mark(int64(runtime.NumGoroutine()))
+				}
+			}()
+			go metrics.Log(metrics.DefaultRegistry, 60*time.Second, l)
+		}
 		if err := daemon(context.String("state-dir"), 20, context.Int("buffer-size")); err != nil {
 			logrus.Fatal(err)
 		}

containerd/main.go

@@ -28,6 +28,7 @@ func main() {
 	}
 	app.Flags = []cli.Flag{
 		cli.BoolFlag{Name: "debug", Usage: "enable debug output in the logs"},
+		//		cli.StringFlag{Name: "metrics", Value: "stdout", Usage: "metrics file"},
 	}
 	app.Before = func(context *cli.Context) error {
 		if context.GlobalBool("debug") {

supervisor.go

@@ -3,8 +3,14 @@ package containerd
 import (
 	"os"
 	"sync"
+	"time"
 
 	"github.com/Sirupsen/logrus"
+	"github.com/rcrowley/go-metrics"
+)
+
+var (
+	containerStartTimer = metrics.NewTimer()
 )
 
 // NewSupervisor returns an initialized Process supervisor.
@@ -12,6 +18,8 @@ func NewSupervisor(stateDir string, concurrency int) (*Supervisor, error) {
 	if err := os.MkdirAll(stateDir, 0755); err != nil {
 		return nil, err
 	}
+	// register counters
+	metrics.DefaultRegistry.Register("container-start-time", containerStartTimer)
 	runtime, err := NewRuntime(stateDir)
 	if err != nil {
 		return nil, err
@@ -93,9 +101,11 @@ func (s *Supervisor) worker(id int) {
 		s.workerGroup.Done()
 		logrus.WithField("worker", id).Debug("containerd: worker finished")
 	}()
+	logrus.WithField("worker", id).Debug("containerd: starting worker")
 	for job := range s.jobs {
 		switch j := job.(type) {
 		case *CreateJob:
+			start := time.Now()
 			container, err := s.runtime.Create(j.ID, j.BundlePath)
 			if err != nil {
 				j.Err <- err
@@ -105,6 +115,7 @@ func (s *Supervisor) worker(id int) {
 				Container: container,
 			})
 			j.Err <- nil
+			containerStartTimer.UpdateSince(start)
 		}
 	}
 }