Podman Stats additional features

added Avg Cpu calculation and CPU up time to podman stats. Adding different feature sets in different PRs, CPU first.

resolves containers#9258

Signed-off-by: cdoern <cbdoer23@g.holycross.edu>

cmd/podman/containers/stats.go

@@ -146,7 +146,9 @@ func stats(cmd *cobra.Command, args []string) error {
 func outputStats(reports []define.ContainerStats) error {
 	headers := report.Headers(define.ContainerStats{}, map[string]string{
 		"ID":            "ID",
+		"UpTime":        "CPU TIME",
 		"CPUPerc":       "CPU %",
+		"AVGCPU":        "Avg CPU %",
 		"MemUsage":      "MEM USAGE / LIMIT",
 		"MemUsageBytes": "MEM USAGE / LIMIT",
 		"MemPerc":       "MEM %",
@@ -166,7 +168,7 @@ func outputStats(reports []define.ContainerStats) error {
 	if report.IsJSON(statsOptions.Format) {
 		return outputJSON(stats)
 	}
-	format := "{{.ID}}\t{{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.MemPerc}}\t{{.NetIO}}\t{{.BlockIO}}\t{{.PIDS}}\n"
+	format := "{{.ID}}\t{{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}\t{{.MemPerc}}\t{{.NetIO}}\t{{.BlockIO}}\t{{.PIDS}}\t{{.UpTime}}\t{{.AVGCPU}}\n"
 	if len(statsOptions.Format) > 0 {
 		format = report.NormalizeFormat(statsOptions.Format)
 	}
@@ -202,6 +204,14 @@ func (s *containerStats) CPUPerc() string {
 	return floatToPercentString(s.CPU)
 }
 
+func (s *containerStats) AVGCPU() string {
+	return floatToPercentString(s.AvgCPU)
+}
+
+func (s *containerStats) Up() string {
+	return fmt.Sprint(s.UpTime)
+}
+
 func (s *containerStats) MemPerc() string {
 	return floatToPercentString(s.ContainerStats.MemPerc)
 }
@@ -257,7 +267,9 @@ func outputJSON(stats []containerStats) error {
 	type jstat struct {
 		Id         string `json:"id"` // nolint
 		Name       string `json:"name"`
+		CPUTime    string `json:"cpu_time"`
 		CpuPercent string `json:"cpu_percent"` // nolint
+		AverageCPU string `json:"avg_cpu"`
 		MemUsage   string `json:"mem_usage"`
 		MemPerc    string `json:"mem_percent"`
 		NetIO      string `json:"net_io"`
@@ -269,7 +281,9 @@ func outputJSON(stats []containerStats) error {
 		jstats = append(jstats, jstat{
 			Id:         j.ID(),
 			Name:       j.Name,
+			CPUTime:    j.Up(),
 			CpuPercent: j.CPUPerc(),
+			AverageCPU: j.AVGCPU(),
 			MemUsage:   j.MemUsage(),
 			MemPerc:    j.MemPerc(),
 			NetIO:      j.NetIO(),

libpod/define/containerstate.go

@@ -1,6 +1,10 @@
 package define
 
-import "github.com/pkg/errors"
+import (
+	"time"
+
+	"github.com/pkg/errors"
+)
 
 // ContainerStatus represents the current state of a container
 type ContainerStatus int
@@ -120,12 +124,14 @@ func (s ContainerExecStatus) String() string {
 
 // ContainerStats contains the statistics information for a running container
 type ContainerStats struct {
+	AvgCPU        float64
 	ContainerID   string
 	Name          string
 	PerCPU        []uint64
 	CPU           float64
 	CPUNano       uint64
 	CPUSystemNano uint64
+	DataPoints    int64
 	SystemNano    uint64
 	MemUsage      uint64
 	MemLimit      uint64
@@ -135,4 +141,6 @@ type ContainerStats struct {
 	BlockInput    uint64
 	BlockOutput   uint64
 	PIDs          uint64
+	UpTime        time.Duration
+	Duration      uint64
 }

libpod/stats.go

@@ -56,7 +56,11 @@ func (c *Container) GetContainerStats(previousStats *define.ContainerStats) (*de
 
 	previousCPU := previousStats.CPUNano
 	now := uint64(time.Now().UnixNano())
+	stats.Duration = cgroupStats.CPU.Usage.Total
+	stats.UpTime = time.Duration(stats.Duration)
 	stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, now, previousStats.SystemNano)
+	stats.AvgCPU = calculateAvgCPU(stats.CPU, previousStats.AvgCPU, previousStats.DataPoints)
+	stats.DataPoints = previousStats.DataPoints + 1
 	stats.MemUsage = cgroupStats.Memory.Usage.Usage
 	stats.MemLimit = getMemLimit(cgroupStats.Memory.Usage.Limit)
 	stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100
@@ -127,3 +131,10 @@ func calculateBlockIO(stats *cgroups.Metrics) (read uint64, write uint64) {
 	}
 	return
 }
+
+// calculateAvgCPU calculates the avg CPU percentage given the previous average and the number of data points.
+func calculateAvgCPU(statsCPU float64, prevAvg float64, prevData int64) float64 {
+	total := prevAvg
+	avgPer := ((total * float64(prevData)) + statsCPU) / (float64(prevData) + 1)
+	return avgPer
+}

test/e2e/stats_test.go

@@ -83,6 +83,17 @@ var _ = Describe("Podman stats", func() {
 		Expect(session.ExitCode()).To(Equal(0))
 	})
 
+	It("podman stats only output CPU data", func() {
+		session := podmanTest.RunTopContainer("")
+		session.WaitWithDefaultTimeout()
+		Expect(session.ExitCode()).To(Equal(0))
+		session = podmanTest.Podman([]string{"stats", "--all", "--no-stream", "--format", "\"{{.ID}} {{.UpTime}} {{.AVGCPU}}\""})
+		session.WaitWithDefaultTimeout()
+		Expect(session.LineInOutputContains("UpTime").To(BeTrue())
+		Expect(session.LineInOutputContains("AVGCPU").To(BeTrue())
+		Expect(session.ExitCode()).To(Equal(0))
+	})
+
 	It("podman stats with json output", func() {
 		var found bool
 		session := podmanTest.RunTopContainer("")