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Docker stats: display Block IO stats

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Signed-off-by: Zhang Wei <zhangwei555@huawei.com>
This commit is contained in:
Zhang Wei 2015-07-26 16:14:00 +08:00
parent 468bc7d819
commit 6a4ac63aaa
5 changed files with 33 additions and 13 deletions
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24
api/client/stats.go
View file

@ -25,6 +25,8 @@ type containerStats struct {
MemoryPercentage float64
NetworkRx float64
NetworkTx float64
BlockRead float64
BlockWrite float64
mu sync.RWMutex
err error
}
@ -66,6 +68,7 @@ func (s *containerStats) Collect(cli *DockerCli, streamStats bool) {
previousCPU = v.PreCpuStats.CpuUsage.TotalUsage
previousSystem = v.PreCpuStats.SystemUsage
cpuPercent = calculateCPUPercent(previousCPU, previousSystem, v)
blkRead, blkWrite := calculateBlockIO(v.BlkioStats)
s.mu.Lock()
s.CPUPercentage = cpuPercent
s.Memory = float64(v.MemoryStats.Usage)
@ -73,6 +76,8 @@ func (s *containerStats) Collect(cli *DockerCli, streamStats bool) {
s.MemoryPercentage = memPercent
s.NetworkRx = float64(v.Network.RxBytes)
s.NetworkTx = float64(v.Network.TxBytes)
s.BlockRead = float64(blkRead)
s.BlockWrite = float64(blkWrite)
s.mu.Unlock()
u <- nil
if !streamStats {
@ -110,12 +115,13 @@ func (s *containerStats) Display(w io.Writer) error {
if s.err != nil {
return s.err
}
fmt.Fprintf(w, "%s\t%.2f%%\t%s / %s\t%.2f%%\t%s / %s\n",
fmt.Fprintf(w, "%s\t%.2f%%\t%s / %s\t%.2f%%\t%s / %s\t%s / %s\n",
s.Name,
s.CPUPercentage,
units.HumanSize(s.Memory), units.HumanSize(s.MemoryLimit),
s.MemoryPercentage,
units.HumanSize(s.NetworkRx), units.HumanSize(s.NetworkTx))
units.HumanSize(s.NetworkRx), units.HumanSize(s.NetworkTx),
units.HumanSize(s.BlockRead), units.HumanSize(s.BlockWrite))
return nil
}
@ -142,7 +148,7 @@ func (cli *DockerCli) CmdStats(args ...string) error {
fmt.Fprint(cli.out, "\033[2J")
fmt.Fprint(cli.out, "\033[H")
}
io.WriteString(w, "CONTAINER\tCPU %\tMEM USAGE / LIMIT\tMEM %\tNET I/O\n")
io.WriteString(w, "CONTAINER\tCPU %\tMEM USAGE / LIMIT\tMEM %\tNET I/O\tBLOCK I/O\n")
}
for _, n := range names {
s := &containerStats{Name: n}
@ -200,3 +206,15 @@ func calculateCPUPercent(previousCPU, previousSystem uint64, v *types.Stats) flo
}
return cpuPercent
}
func calculateBlockIO(blkio types.BlkioStats) (blkRead uint64, blkWrite uint64) {
for _, bioEntry := range blkio.IoServiceBytesRecursive {
switch strings.ToLower(bioEntry.Op) {
case "read":
blkRead = bioEntry.Value
case "write":
blkWrite = bioEntry.Value
}
}
return
}

4
api/client/stats_unit_test.go
View file

@ -15,6 +15,8 @@ func TestDisplay(t *testing.T) {
MemoryPercentage: 100.0 / 2048.0 * 100.0,
NetworkRx: 100 * 1024 * 1024,
NetworkTx: 800 * 1024 * 1024,
BlockRead: 100 * 1024 * 1024,
BlockWrite: 800 * 1024 * 1024,
mu: sync.RWMutex{},
}
var b bytes.Buffer
@ -22,7 +24,7 @@ func TestDisplay(t *testing.T) {
t.Fatalf("c.Display() gave error: %s", err)
}
got := b.String()
want := "app\t30.00%\t104.9 MB / 2.147 GB\t4.88%\t104.9 MB / 838.9 MB\n"
want := "app\t30.00%\t104.9 MB / 2.147 GB\t4.88%\t104.9 MB / 838.9 MB\t104.9 MB / 838.9 MB\n"
if got != want {
t.Fatalf("c.Display() = %q, want %q", got, want)
}

6
docs/articles/runmetrics.md
View file

@ -21,9 +21,9 @@ and network IO metrics.
The following is a sample output from the `docker stats` command
$ docker stats redis1 redis2
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O
redis1 0.07% 796 KB / 64 MB 1.21% 788 B / 648 B
redis2 0.07% 2.746 MB / 64 MB 4.29% 1.266 KB / 648 B
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O
redis1 0.07% 796 KB / 64 MB 1.21% 788 B / 648 B 3.568 MB / 512 KB
redis2 0.07% 2.746 MB / 64 MB 4.29% 1.266 KB / 648 B 12.4 MB / 0 B
The [docker stats](/reference/commandline/stats/) reference page has

6
docs/reference/commandline/stats.md
View file

@ -21,9 +21,9 @@ weight=1
Running `docker stats` on multiple containers
$ docker stats redis1 redis2
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O
redis1 0.07% 796 KB / 64 MB 1.21% 788 B / 648 B
redis2 0.07% 2.746 MB / 64 MB 4.29% 1.266 KB / 648 B
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O
redis1 0.07% 796 KB / 64 MB 1.21% 788 B / 648 B 3.568 MB / 512 KB
redis2 0.07% 2.746 MB / 64 MB 4.29% 1.266 KB / 648 B 12.4 MB / 0 B
The `docker stats` command will only return a live stream of data for running

6
man/docker-stats.1.md
View file

@ -25,6 +25,6 @@ Display a live stream of one or more containers' resource usage statistics
Run **docker stats** with multiple containers.
$ docker stats redis1 redis2
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O
redis1 0.07% 796 KB / 64 MB 1.21% 788 B / 648 B
redis2 0.07% 2.746 MB / 64 MB 4.29% 1.266 KB / 648 B
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O
redis1 0.07% 796 KB / 64 MB 1.21% 788 B / 648 B 3.568 MB / 512 KB
redis2 0.07% 2.746 MB / 64 MB 4.29% 1.266 KB / 648 B 12.4 MB / 0 B