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Windows: stats support 

Signed-off-by: John Howard <jhoward@microsoft.com>
This commit is contained in:
John Howard 2016-09-07 16:08:51 -07:00
parent a7c25f9540
commit 340e5233b2
22 changed files with 585 additions and 323 deletions
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118
api/types/stats.go
View File

@ -4,7 +4,8 @@ package types
import "time"
// ThrottlingData stores CPU throttling stats of one running container
// ThrottlingData stores CPU throttling stats of one running container.
// Not used on Windows.
type ThrottlingData struct {
// Number of periods with throttling active
Periods uint64 `json:"periods"`
@ -17,42 +18,68 @@ type ThrottlingData struct {
// CPUUsage stores All CPU stats aggregated since container inception.
type CPUUsage struct {
// Total CPU time consumed.
// Units: nanoseconds.
// Units: nanoseconds (Linux)
// Units: 100's of nanoseconds (Windows)
TotalUsage uint64 `json:"total_usage"`
// Total CPU time consumed per core.
// Units: nanoseconds.
PercpuUsage []uint64 `json:"percpu_usage"`
// Time spent by tasks of the cgroup in kernel mode.
// Total CPU time consumed per core (Linux). Not used on Windows.
// Units: nanoseconds.
PercpuUsage []uint64 `json:"percpu_usage,omitempty"`
// Time spent by tasks of the cgroup in kernel mode (Linux).
// Time spent by all container processes in kernel mode (Windows).
// Units: nanoseconds (Linux).
// Units: 100's of nanoseconds (Windows). Not populated for Hyper-V Containers.
UsageInKernelmode uint64 `json:"usage_in_kernelmode"`
// Time spent by tasks of the cgroup in user mode.
// Units: nanoseconds.
// Time spent by tasks of the cgroup in user mode (Linux).
// Time spent by all container processes in user mode (Windows).
// Units: nanoseconds (Linux).
// Units: 100's of nanoseconds (Windows). Not populated for Hyper-V Containers
UsageInUsermode uint64 `json:"usage_in_usermode"`
}
// CPUStats aggregates and wraps all CPU related info of container
type CPUStats struct {
CPUUsage CPUUsage `json:"cpu_usage"`
SystemUsage uint64 `json:"system_cpu_usage"`
// CPU Usage. Linux and Windows.
CPUUsage CPUUsage `json:"cpu_usage"`
// System Usage. Linux only.
SystemUsage uint64 `json:"system_cpu_usage,omitempty"`
// Throttling Data. Linux only.
ThrottlingData ThrottlingData `json:"throttling_data,omitempty"`
}
// MemoryStats aggregates All memory stats since container inception
// MemoryStats aggregates all memory stats since container inception on Linux.
// Windows returns stats for commit and private working set only.
type MemoryStats struct {
// Linux Memory Stats
// current res_counter usage for memory
Usage uint64 `json:"usage"`
Usage uint64 `json:"usage,omitempty"`
// maximum usage ever recorded.
MaxUsage uint64 `json:"max_usage"`
MaxUsage uint64 `json:"max_usage,omitempty"`
// TODO(vishh): Export these as stronger types.
// all the stats exported via memory.stat.
Stats map[string]uint64 `json:"stats"`
Stats map[string]uint64 `json:"stats,omitempty"`
// number of times memory usage hits limits.
Failcnt uint64 `json:"failcnt"`
Limit uint64 `json:"limit"`
Failcnt uint64 `json:"failcnt,omitempty"`
Limit uint64 `json:"limit,omitempty"`
// Windows Memory Stats
// See https://technet.microsoft.com/en-us/magazine/ff382715.aspx
// committed bytes
Commit uint64 `json:"commitbytes,omitempty"`
// peak committed bytes
CommitPeak uint64 `json:"commitpeakbytes,omitempty"`
// private working set
PrivateWorkingSet uint64 `json:"privateworkingset,omitempty"`
}
// BlkioStatEntry is one small entity to store a piece of Blkio stats
// TODO Windows: This can be factored out
// Not used on Windows.
type BlkioStatEntry struct {
Major uint64 `json:"major"`
Minor uint64 `json:"minor"`
@ -60,8 +87,10 @@ type BlkioStatEntry struct {
Value uint64 `json:"value"`
}
// BlkioStats stores All IO service stats for data read and write
// TODO Windows: This can be factored out
// BlkioStats stores All IO service stats for data read and write.
// This is a Linux specific structure as the differences between expressing
// block I/O on Windows and Linux are sufficiently significant to make
// little sense attempting to morph into a combined structure.
type BlkioStats struct {
// number of bytes transferred to and from the block device
IoServiceBytesRecursive []BlkioStatEntry `json:"io_service_bytes_recursive"`
@ -74,17 +103,38 @@ type BlkioStats struct {
SectorsRecursive []BlkioStatEntry `json:"sectors_recursive"`
}
// NetworkStats aggregates All network stats of one container
// TODO Windows: This will require refactoring
// StorageStats is the disk I/O stats for read/write on Windows.
type StorageStats struct {
ReadCountNormalized uint64 `json:"read_count_normalized,omitempty"`
ReadSizeBytes uint64 `json:"read_size_bytes,omitempty"`
WriteCountNormalized uint64 `json:"write_count_normalized,omitempty"`
WriteSizeBytes uint64 `json:"write_size_bytes,omitempty"`
}
// NetworkStats aggregates the network stats of one container
type NetworkStats struct {
RxBytes uint64 `json:"rx_bytes"`
// Bytes received. Windows and Linux.
RxBytes uint64 `json:"rx_bytes"`
// Packets received. Windows and Linux.
RxPackets uint64 `json:"rx_packets"`
RxErrors uint64 `json:"rx_errors"`
// Received errors. Not used on Windows. Note that we dont `omitempty` this
// field as it is expected in the >=v1.21 API stats structure.
RxErrors uint64 `json:"rx_errors"`
// Incoming packets dropped. Windows and Linux.
RxDropped uint64 `json:"rx_dropped"`
TxBytes uint64 `json:"tx_bytes"`
// Bytes sent. Windows and Linux.
TxBytes uint64 `json:"tx_bytes"`
// Packets sent. Windows and Linux.
TxPackets uint64 `json:"tx_packets"`
TxErrors uint64 `json:"tx_errors"`
// Sent errors. Not used on Windows. Note that we dont `omitempty` this
// field as it is expected in the >=v1.21 API stats structure.
TxErrors uint64 `json:"tx_errors"`
// Outgoing packets dropped. Windows and Linux.
TxDropped uint64 `json:"tx_dropped"`
// Endpoint ID. Not used on Linux.
EndpointID string `json:"endpoint_id,omitempty"`
// Instance ID. Not used on Linux.
InstanceID string `json:"instance_id,omitempty"`
}
// PidsStats contains the stats of a container's pids
@ -98,12 +148,22 @@ type PidsStats struct {
// Stats is Ultimate struct aggregating all types of stats of one container
type Stats struct {
Read time.Time `json:"read"`
PreCPUStats CPUStats `json:"precpu_stats,omitempty"`
// Common stats
Read time.Time `json:"read"`
PreRead time.Time `json:"preread"`
// Linux specific stats, not populated on Windows.
PidsStats PidsStats `json:"pids_stats,omitempty"`
BlkioStats BlkioStats `json:"blkio_stats,omitempty"`
// Windows specific stats, not populated on Linux.
NumProcs uint32 `json:"num_procs"`
StorageStats StorageStats `json:"storage_stats,omitempty"`
// Shared stats
CPUStats CPUStats `json:"cpu_stats,omitempty"`
PreCPUStats CPUStats `json:"precpu_stats,omitempty"` // "Pre"="Previous"
MemoryStats MemoryStats `json:"memory_stats,omitempty"`
BlkioStats BlkioStats `json:"blkio_stats,omitempty"`
PidsStats PidsStats `json:"pids_stats,omitempty"`
}
// StatsJSON is newly used Networks

8
api/types/types.go
View File

@ -1,6 +1,7 @@
package types
import (
"io"
"os"
"time"
@ -182,6 +183,13 @@ type ContainerPathStat struct {
LinkTarget string `json:"linkTarget"`
}
// ContainerStats contains resonse of Remote API:
// GET "/stats"
type ContainerStats struct {
Body io.ReadCloser `json:"body"`
OSType string `json:"ostype"`
}
// ContainerProcessList contains response of Remote API:
// GET "/containers/{name:.*}/top"
type ContainerProcessList struct {

10
cli/command/container/stats.go
View File

@ -187,7 +187,15 @@ func runStats(dockerCli *command.DockerCli, opts *statsOptions) error {
fmt.Fprint(dockerCli.Out(), "\033[2J")
fmt.Fprint(dockerCli.Out(), "\033[H")
}
io.WriteString(w, "CONTAINER\tCPU %\tMEM USAGE / LIMIT\tMEM %\tNET I/O\tBLOCK I/O\tPIDS\n")
switch daemonOSType {
case "":
// Before we have any stats from the daemon, we don't know the platform...
io.WriteString(w, "Waiting for statistics...\n")
case "windows":
io.WriteString(w, "CONTAINER\tCPU %\tPRIV WORKING SET\tNET I/O\tBLOCK I/O\n")
default:
io.WriteString(w, "CONTAINER\tCPU %\tMEM USAGE / LIMIT\tMEM %\tNET I/O\tBLOCK I/O\tPIDS\n")
}
}
for range time.Tick(500 * time.Millisecond) {

144
cli/command/container/stats_helpers.go
View File

@ -19,23 +19,29 @@ import (
type containerStats struct {
Name string
CPUPercentage float64
Memory float64
MemoryLimit float64
MemoryPercentage float64
Memory float64 // On Windows this is the private working set
MemoryLimit float64 // Not used on Windows
MemoryPercentage float64 // Not used on Windows
NetworkRx float64
NetworkTx float64
BlockRead float64
BlockWrite float64
PidsCurrent uint64
PidsCurrent uint64 // Not used on Windows
mu sync.Mutex
err error
}
type stats struct {
mu sync.Mutex
cs []*containerStats
mu sync.Mutex
ostype string
cs []*containerStats
}
// daemonOSType is set once we have at least one stat for a container
// from the daemon. It is used to ensure we print the right header based
// on the daemon platform.
var daemonOSType string
func (s *stats) add(cs *containerStats) bool {
s.mu.Lock()
defer s.mu.Unlock()
@ -80,22 +86,28 @@ func (s *containerStats) Collect(ctx context.Context, cli client.APIClient, stre
}
}()
responseBody, err := cli.ContainerStats(ctx, s.Name, streamStats)
response, err := cli.ContainerStats(ctx, s.Name, streamStats)
if err != nil {
s.mu.Lock()
s.err = err
s.mu.Unlock()
return
}
defer responseBody.Close()
defer response.Body.Close()
dec := json.NewDecoder(responseBody)
dec := json.NewDecoder(response.Body)
go func() {
for {
var v *types.StatsJSON
var (
v *types.StatsJSON
memPercent = 0.0
cpuPercent = 0.0
blkRead, blkWrite uint64 // Only used on Linux
mem = 0.0
)
if err := dec.Decode(&v); err != nil {
dec = json.NewDecoder(io.MultiReader(dec.Buffered(), responseBody))
dec = json.NewDecoder(io.MultiReader(dec.Buffered(), response.Body))
u <- err
if err == io.EOF {
break
@ -104,28 +116,38 @@ func (s *containerStats) Collect(ctx context.Context, cli client.APIClient, stre
continue
}
var memPercent = 0.0
var cpuPercent = 0.0
daemonOSType = response.OSType
// MemoryStats.Limit will never be 0 unless the container is not running and we haven't
// got any data from cgroup
if v.MemoryStats.Limit != 0 {
memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
if daemonOSType != "windows" {
// MemoryStats.Limit will never be 0 unless the container is not running and we haven't
// got any data from cgroup
if v.MemoryStats.Limit != 0 {
memPercent = float64(v.MemoryStats.Usage) / float64(v.MemoryStats.Limit) * 100.0
}
previousCPU = v.PreCPUStats.CPUUsage.TotalUsage
previousSystem = v.PreCPUStats.SystemUsage
cpuPercent = calculateCPUPercentUnix(previousCPU, previousSystem, v)
blkRead, blkWrite = calculateBlockIO(v.BlkioStats)
mem = float64(v.MemoryStats.Usage)
} else {
cpuPercent = calculateCPUPercentWindows(v)
blkRead = v.StorageStats.ReadSizeBytes
blkWrite = v.StorageStats.WriteSizeBytes
mem = float64(v.MemoryStats.PrivateWorkingSet)
}
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)
s.MemoryLimit = float64(v.MemoryStats.Limit)
s.MemoryPercentage = memPercent
s.Memory = mem
s.NetworkRx, s.NetworkTx = calculateNetwork(v.Networks)
s.BlockRead = float64(blkRead)
s.BlockWrite = float64(blkWrite)
s.PidsCurrent = v.PidsStats.Current
if daemonOSType != "windows" {
s.MemoryLimit = float64(v.MemoryStats.Limit)
s.MemoryPercentage = memPercent
s.PidsCurrent = v.PidsStats.Current
}
s.mu.Unlock()
u <- nil
if !streamStats {
@ -178,29 +200,49 @@ func (s *containerStats) Collect(ctx context.Context, cli client.APIClient, stre
func (s *containerStats) Display(w io.Writer) error {
s.mu.Lock()
defer s.mu.Unlock()
// NOTE: if you change this format, you must also change the err format below!
format := "%s\t%.2f%%\t%s / %s\t%.2f%%\t%s / %s\t%s / %s\t%d\n"
if s.err != nil {
format = "%s\t%s\t%s / %s\t%s\t%s / %s\t%s / %s\t%s\n"
errStr := "--"
if daemonOSType == "windows" {
// NOTE: if you change this format, you must also change the err format below!
format := "%s\t%.2f%%\t%s\t%s / %s\t%s / %s\n"
if s.err != nil {
format = "%s\t%s\t%s\t%s / %s\t%s / %s\n"
errStr := "--"
fmt.Fprintf(w, format,
s.Name, errStr, errStr, errStr, errStr, errStr, errStr,
)
err := s.err
return err
}
fmt.Fprintf(w, format,
s.Name, errStr, errStr, errStr, errStr, errStr, errStr, errStr, errStr, errStr,
)
err := s.err
return err
s.Name,
s.CPUPercentage,
units.BytesSize(s.Memory),
units.HumanSizeWithPrecision(s.NetworkRx, 3), units.HumanSizeWithPrecision(s.NetworkTx, 3),
units.HumanSizeWithPrecision(s.BlockRead, 3), units.HumanSizeWithPrecision(s.BlockWrite, 3))
} else {
// NOTE: if you change this format, you must also change the err format below!
format := "%s\t%.2f%%\t%s / %s\t%.2f%%\t%s / %s\t%s / %s\t%d\n"
if s.err != nil {
format = "%s\t%s\t%s / %s\t%s\t%s / %s\t%s / %s\t%s\n"
errStr := "--"
fmt.Fprintf(w, format,
s.Name, errStr, errStr, errStr, errStr, errStr, errStr, errStr, errStr, errStr,
)
err := s.err
return err
}
fmt.Fprintf(w, format,
s.Name,
s.CPUPercentage,
units.BytesSize(s.Memory), units.BytesSize(s.MemoryLimit),
s.MemoryPercentage,
units.HumanSizeWithPrecision(s.NetworkRx, 3), units.HumanSizeWithPrecision(s.NetworkTx, 3),
units.HumanSizeWithPrecision(s.BlockRead, 3), units.HumanSizeWithPrecision(s.BlockWrite, 3),
s.PidsCurrent)
}
fmt.Fprintf(w, format,
s.Name,
s.CPUPercentage,
units.BytesSize(s.Memory), units.BytesSize(s.MemoryLimit),
s.MemoryPercentage,
units.HumanSizeWithPrecision(s.NetworkRx, 3), units.HumanSizeWithPrecision(s.NetworkTx, 3),
units.HumanSizeWithPrecision(s.BlockRead, 3), units.HumanSizeWithPrecision(s.BlockWrite, 3),
s.PidsCurrent)
return nil
}
func calculateCPUPercent(previousCPU, previousSystem uint64, v *types.StatsJSON) float64 {
func calculateCPUPercentUnix(previousCPU, previousSystem uint64, v *types.StatsJSON) float64 {
var (
cpuPercent = 0.0
// calculate the change for the cpu usage of the container in between readings
@ -215,6 +257,22 @@ func calculateCPUPercent(previousCPU, previousSystem uint64, v *types.StatsJSON)
return cpuPercent
}
func calculateCPUPercentWindows(v *types.StatsJSON) float64 {
// Max number of 100ns intervals between the previous time read and now
possIntervals := uint64(v.Read.Sub(v.PreRead).Nanoseconds()) // Start with number of ns intervals
possIntervals /= 100 // Convert to number of 100ns intervals
possIntervals *= uint64(v.NumProcs) // Multiple by the number of processors
// Intervals used
intervalsUsed := v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage
// Percentage avoiding divide-by-zero
if possIntervals > 0 {
return float64(intervalsUsed) / float64(possIntervals) * 100.0
}
return 0.00
}
func calculateBlockIO(blkio types.BlkioStats) (blkRead uint64, blkWrite uint64) {
for _, bioEntry := range blkio.IoServiceBytesRecursive {
switch strings.ToLower(bioEntry.Op) {

10
client/container_stats.go
View File

@ -1,15 +1,15 @@
package client
import (
"io"
"net/url"
"github.com/docker/docker/api/types"
"golang.org/x/net/context"
)
// ContainerStats returns near realtime stats for a given container.
// It's up to the caller to close the io.ReadCloser returned.
func (cli *Client) ContainerStats(ctx context.Context, containerID string, stream bool) (io.ReadCloser, error) {
func (cli *Client) ContainerStats(ctx context.Context, containerID string, stream bool) (types.ContainerStats, error) {
query := url.Values{}
query.Set("stream", "0")
if stream {
@ -18,7 +18,9 @@ func (cli *Client) ContainerStats(ctx context.Context, containerID string, strea
resp, err := cli.get(ctx, "/containers/"+containerID+"/stats", query, nil)
if err != nil {
return nil, err
return types.ContainerStats{}, err
}
return resp.body, err
osType := GetDockerOS(resp.header.Get("Server"))
return types.ContainerStats{Body: resp.body, OSType: osType}, err
}

6
client/container_stats_test.go
View File

@ -54,12 +54,12 @@ func TestContainerStats(t *testing.T) {
}, nil
}),
}
body, err := client.ContainerStats(context.Background(), "container_id", c.stream)
resp, err := client.ContainerStats(context.Background(), "container_id", c.stream)
if err != nil {
t.Fatal(err)
}
defer body.Close()
content, err := ioutil.ReadAll(body)
defer resp.Body.Close()
content, err := ioutil.ReadAll(resp.Body)
if err != nil {
t.Fatal(err)
}

5
client/image_build.go
View File

@ -39,7 +39,7 @@ func (cli *Client) ImageBuild(ctx context.Context, buildContext io.Reader, optio
return types.ImageBuildResponse{}, err
}
osType := getDockerOS(serverResp.header.Get("Server"))
osType := GetDockerOS(serverResp.header.Get("Server"))
return types.ImageBuildResponse{
Body: serverResp.body,
@ -113,7 +113,8 @@ func imageBuildOptionsToQuery(options types.ImageBuildOptions) (url.Values, erro
return query, nil
}
func getDockerOS(serverHeader string) string {
// GetDockerOS returns the operating system based on the server header from the daemon.
func GetDockerOS(serverHeader string) string {
var osType string
matches := headerRegexp.FindStringSubmatch(serverHeader)
if len(matches) > 0 {

2
client/image_build_test.go
View File

@ -222,7 +222,7 @@ func TestGetDockerOS(t *testing.T) {
"Foo/v1.22 (bar)": "",
}
for header, os := range cases {
g := getDockerOS(header)
g := GetDockerOS(header)
if g != os {
t.Fatalf("Expected %s, got %s", os, g)
}

2
client/interface.go
View File

@ -51,7 +51,7 @@ type ContainerAPIClient interface {
ContainerResize(ctx context.Context, container string, options types.ResizeOptions) error
ContainerRestart(ctx context.Context, container string, timeout *time.Duration) error
ContainerStatPath(ctx context.Context, container, path string) (types.ContainerPathStat, error)
ContainerStats(ctx context.Context, container string, stream bool) (io.ReadCloser, error)
ContainerStats(ctx context.Context, container string, stream bool) (types.ContainerStats, error)
ContainerStart(ctx context.Context, container string, options types.ContainerStartOptions) error
ContainerStop(ctx context.Context, container string, timeout *time.Duration) error
ContainerTop(ctx context.Context, container string, arguments []string) (types.ContainerProcessList, error)

58
daemon/daemon_windows.go
View File

@ -14,6 +14,7 @@ import (
"github.com/docker/docker/image"
"github.com/docker/docker/pkg/idtools"
"github.com/docker/docker/pkg/parsers"
"github.com/docker/docker/pkg/platform"
"github.com/docker/docker/pkg/sysinfo"
"github.com/docker/docker/pkg/system"
"github.com/docker/docker/runconfig"
@ -379,7 +380,62 @@ func driverOptions(config *Config) []nwconfig.Option {
}
func (daemon *Daemon) stats(c *container.Container) (*types.StatsJSON, error) {
return nil, nil
if !c.IsRunning() {
return nil, errNotRunning{c.ID}
}
// Obtain the stats from HCS via libcontainerd
stats, err := daemon.containerd.Stats(c.ID)
if err != nil {
return nil, err
}
// Start with an empty structure
s := &types.StatsJSON{}
// Populate the CPU/processor statistics
s.CPUStats = types.CPUStats{
CPUUsage: types.CPUUsage{
TotalUsage: stats.Processor.TotalRuntime100ns,
UsageInKernelmode: stats.Processor.RuntimeKernel100ns,
UsageInUsermode: stats.Processor.RuntimeKernel100ns,
},
}
// Populate the memory statistics
s.MemoryStats = types.MemoryStats{
Commit: stats.Memory.UsageCommitBytes,
CommitPeak: stats.Memory.UsageCommitPeakBytes,
PrivateWorkingSet: stats.Memory.UsagePrivateWorkingSetBytes,
}
// Populate the storage statistics
s.StorageStats = types.StorageStats{
ReadCountNormalized: stats.Storage.ReadCountNormalized,
ReadSizeBytes: stats.Storage.ReadSizeBytes,
WriteCountNormalized: stats.Storage.WriteCountNormalized,
WriteSizeBytes: stats.Storage.WriteSizeBytes,
}
// Populate the network statistics
s.Networks = make(map[string]types.NetworkStats)
for _, nstats := range stats.Network {
s.Networks[nstats.EndpointId] = types.NetworkStats{
RxBytes: nstats.BytesReceived,
RxPackets: nstats.PacketsReceived,
RxDropped: nstats.DroppedPacketsIncoming,
TxBytes: nstats.BytesSent,
TxPackets: nstats.PacketsSent,
TxDropped: nstats.DroppedPacketsOutgoing,
}
}
// Set the timestamp
s.Stats.Read = stats.Timestamp
s.Stats.NumProcs = platform.NumProcs()
return s, nil
}
// setDefaultIsolation determine the default isolation mode for the

62
daemon/stats.go
View File

@ -3,8 +3,8 @@ package daemon
import (
"encoding/json"
"errors"
"fmt"
"runtime"
"time"
"golang.org/x/net/context"
@ -19,9 +19,6 @@ import (
// ContainerStats writes information about the container to the stream
// given in the config object.
func (daemon *Daemon) ContainerStats(ctx context.Context, prefixOrName string, config *backend.ContainerStatsConfig) error {
if runtime.GOOS == "windows" {
return errors.New("Windows does not support stats")
}
// Remote API version (used for backwards compatibility)
apiVersion := config.Version
@ -44,10 +41,13 @@ func (daemon *Daemon) ContainerStats(ctx context.Context, prefixOrName string, c
}
var preCPUStats types.CPUStats
var preRead time.Time
getStatJSON := func(v interface{}) *types.StatsJSON {
ss := v.(types.StatsJSON)
ss.PreCPUStats = preCPUStats
ss.PreRead = preRead
preCPUStats = ss.CPUStats
preRead = ss.Read
return &ss
}
@ -67,6 +67,9 @@ func (daemon *Daemon) ContainerStats(ctx context.Context, prefixOrName string, c
var statsJSON interface{}
statsJSONPost120 := getStatJSON(v)
if versions.LessThan(apiVersion, "1.21") {
if runtime.GOOS == "windows" {
return errors.New("API versions pre v1.21 do not support stats on Windows")
}
var (
rxBytes uint64
rxPackets uint64
@ -138,7 +141,8 @@ func (daemon *Daemon) GetContainerStats(container *container.Container) (*types.
return nil, err
}
if !container.Config.NetworkDisabled {
// We already have the network stats on Windows directly from HCS.
if !container.Config.NetworkDisabled && runtime.GOOS != "windows" {
if stats.Networks, err = daemon.getNetworkStats(container); err != nil {
return nil, err
}
@ -146,51 +150,3 @@ func (daemon *Daemon) GetContainerStats(container *container.Container) (*types.
return stats, nil
}
// Resolve Network SandboxID in case the container reuse another container's network stack
func (daemon *Daemon) getNetworkSandboxID(c *container.Container) (string, error) {
curr := c
for curr.HostConfig.NetworkMode.IsContainer() {
containerID := curr.HostConfig.NetworkMode.ConnectedContainer()
connected, err := daemon.GetContainer(containerID)
if err != nil {
return "", fmt.Errorf("Could not get container for %s", containerID)
}
curr = connected
}
return curr.NetworkSettings.SandboxID, nil
}
func (daemon *Daemon) getNetworkStats(c *container.Container) (map[string]types.NetworkStats, error) {
sandboxID, err := daemon.getNetworkSandboxID(c)
if err != nil {
return nil, err
}
sb, err := daemon.netController.SandboxByID(sandboxID)
if err != nil {
return nil, err
}
lnstats, err := sb.Statistics()
if err != nil {
return nil, err
}
stats := make(map[string]types.NetworkStats)
// Convert libnetwork nw stats into engine-api stats
for ifName, ifStats := range lnstats {
stats[ifName] = types.NetworkStats{
RxBytes: ifStats.RxBytes,
RxPackets: ifStats.RxPackets,
RxErrors: ifStats.RxErrors,
RxDropped: ifStats.RxDropped,
TxBytes: ifStats.TxBytes,
TxPackets: ifStats.TxPackets,
TxErrors: ifStats.TxErrors,
TxDropped: ifStats.TxDropped,
}
}
return stats, nil
}

132
daemon/stats_collector.go Normal file
View File

@ -0,0 +1,132 @@
// +build !solaris
package daemon
import (
"bufio"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/container"
"github.com/docker/docker/pkg/pubsub"
)
type statsSupervisor interface {
// GetContainerStats collects all the stats related to a container
GetContainerStats(container *container.Container) (*types.StatsJSON, error)
}
// newStatsCollector returns a new statsCollector that collections
// stats for a registered container at the specified interval.
// The collector allows non-running containers to be added
// and will start processing stats when they are started.
func (daemon *Daemon) newStatsCollector(interval time.Duration) *statsCollector {
s := &statsCollector{
interval: interval,
supervisor: daemon,
publishers: make(map[*container.Container]*pubsub.Publisher),
bufReader: bufio.NewReaderSize(nil, 128),
}
platformNewStatsCollector(s)
go s.run()
return s
}
// statsCollector manages and provides container resource stats
type statsCollector struct {
m sync.Mutex
supervisor statsSupervisor
interval time.Duration
publishers map[*container.Container]*pubsub.Publisher
bufReader *bufio.Reader
// The following fields are not set on Windows currently.
clockTicksPerSecond uint64
machineMemory uint64
}
// collect registers the container with the collector and adds it to
// the event loop for collection on the specified interval returning
// a channel for the subscriber to receive on.
func (s *statsCollector) collect(c *container.Container) chan interface{} {
s.m.Lock()
defer s.m.Unlock()
publisher, exists := s.publishers[c]
if !exists {
publisher = pubsub.NewPublisher(100*time.Millisecond, 1024)
s.publishers[c] = publisher
}
return publisher.Subscribe()
}
// stopCollection closes the channels for all subscribers and removes
// the container from metrics collection.
func (s *statsCollector) stopCollection(c *container.Container) {
s.m.Lock()
if publisher, exists := s.publishers[c]; exists {
publisher.Close()
delete(s.publishers, c)
}
s.m.Unlock()
}
// unsubscribe removes a specific subscriber from receiving updates for a container's stats.
func (s *statsCollector) unsubscribe(c *container.Container, ch chan interface{}) {
s.m.Lock()
publisher := s.publishers[c]
if publisher != nil {
publisher.Evict(ch)
if publisher.Len() == 0 {
delete(s.publishers, c)
}
}
s.m.Unlock()
}
func (s *statsCollector) run() {
type publishersPair struct {
container *container.Container
publisher *pubsub.Publisher
}
// we cannot determine the capacity here.
// it will grow enough in first iteration
var pairs []publishersPair
for range time.Tick(s.interval) {
// it does not make sense in the first iteration,
// but saves allocations in further iterations
pairs = pairs[:0]
s.m.Lock()
for container, publisher := range s.publishers {
// copy pointers here to release the lock ASAP
pairs = append(pairs, publishersPair{container, publisher})
}
s.m.Unlock()
if len(pairs) == 0 {
continue
}
systemUsage, err := s.getSystemCPUUsage()
if err != nil {
logrus.Errorf("collecting system cpu usage: %v", err)
continue
}
for _, pair := range pairs {
stats, err := s.supervisor.GetContainerStats(pair.container)
if err != nil {
if _, ok := err.(errNotRunning); !ok {
logrus.Errorf("collecting stats for %s: %v", pair.container.ID, err)
}
continue
}
// FIXME: move to containerd on Linux (not Windows)
stats.CPUStats.SystemUsage = systemUsage
pair.publisher.Publish(*stats)
}
}
}

126
daemon/stats_collector_unix.go
View File

@ -3,141 +3,23 @@
package daemon
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"sync"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types"
"github.com/docker/docker/container"
"github.com/docker/docker/pkg/pubsub"
sysinfo "github.com/docker/docker/pkg/system"
"github.com/opencontainers/runc/libcontainer/system"
)
type statsSupervisor interface {
// GetContainerStats collects all the stats related to a container
GetContainerStats(container *container.Container) (*types.StatsJSON, error)
}
// newStatsCollector returns a new statsCollector that collections
// network and cgroup stats for a registered container at the specified
// interval. The collector allows non-running containers to be added
// and will start processing stats when they are started.
func (daemon *Daemon) newStatsCollector(interval time.Duration) *statsCollector {
s := &statsCollector{
interval: interval,
supervisor: daemon,
publishers: make(map[*container.Container]*pubsub.Publisher),
clockTicksPerSecond: uint64(system.GetClockTicks()),
bufReader: bufio.NewReaderSize(nil, 128),
}
// platformNewStatsCollector performs platform specific initialisation of the
// statsCollector structure.
func platformNewStatsCollector(s *statsCollector) {
s.clockTicksPerSecond = uint64(system.GetClockTicks())
meminfo, err := sysinfo.ReadMemInfo()
if err == nil && meminfo.MemTotal > 0 {
s.machineMemory = uint64(meminfo.MemTotal)
}
go s.run()
return s
}
// statsCollector manages and provides container resource stats
type statsCollector struct {
m sync.Mutex
supervisor statsSupervisor
interval time.Duration
clockTicksPerSecond uint64
publishers map[*container.Container]*pubsub.Publisher
bufReader *bufio.Reader
machineMemory uint64
}
// collect registers the container with the collector and adds it to
// the event loop for collection on the specified interval returning
// a channel for the subscriber to receive on.
func (s *statsCollector) collect(c *container.Container) chan interface{} {
s.m.Lock()
defer s.m.Unlock()
publisher, exists := s.publishers[c]
if !exists {
publisher = pubsub.NewPublisher(100*time.Millisecond, 1024)
s.publishers[c] = publisher
}
return publisher.Subscribe()
}
// stopCollection closes the channels for all subscribers and removes
// the container from metrics collection.
func (s *statsCollector) stopCollection(c *container.Container) {
s.m.Lock()
if publisher, exists := s.publishers[c]; exists {
publisher.Close()
delete(s.publishers, c)
}
s.m.Unlock()
}
// unsubscribe removes a specific subscriber from receiving updates for a container's stats.
func (s *statsCollector) unsubscribe(c *container.Container, ch chan interface{}) {
s.m.Lock()
publisher := s.publishers[c]
if publisher != nil {
publisher.Evict(ch)
if publisher.Len() == 0 {
delete(s.publishers, c)
}
}
s.m.Unlock()
}
func (s *statsCollector) run() {
type publishersPair struct {
container *container.Container
publisher *pubsub.Publisher
}
// we cannot determine the capacity here.
// it will grow enough in first iteration
var pairs []publishersPair
for range time.Tick(s.interval) {
// it does not make sense in the first iteration,
// but saves allocations in further iterations
pairs = pairs[:0]
s.m.Lock()
for container, publisher := range s.publishers {
// copy pointers here to release the lock ASAP
pairs = append(pairs, publishersPair{container, publisher})
}
s.m.Unlock()
if len(pairs) == 0 {
continue
}
systemUsage, err := s.getSystemCPUUsage()
if err != nil {
logrus.Errorf("collecting system cpu usage: %v", err)
continue
}
for _, pair := range pairs {
stats, err := s.supervisor.GetContainerStats(pair.container)
if err != nil {
if _, ok := err.(errNotRunning); !ok {
logrus.Errorf("collecting stats for %s: %v", pair.container.ID, err)
}
continue
}
// FIXME: move to containerd
stats.CPUStats.SystemUsage = systemUsage
pair.publisher.Publish(*stats)
}
}
}
const nanoSecondsPerSecond = 1e9

40
daemon/stats_collector_windows.go
View File

@ -1,35 +1,15 @@
// +build windows
package daemon
import (
"time"
"github.com/docker/docker/container"
)
// newStatsCollector returns a new statsCollector for collection stats
// for a registered container at the specified interval. The collector allows
// non-running containers to be added and will start processing stats when
// they are started.
func (daemon *Daemon) newStatsCollector(interval time.Duration) *statsCollector {
return &statsCollector{}
// platformNewStatsCollector performs platform specific initialisation of the
// statsCollector structure. This is a no-op on Windows.
func platformNewStatsCollector(s *statsCollector) {
}
// statsCollector manages and provides container resource stats
type statsCollector struct {
}
// collect registers the container with the collector and adds it to
// the event loop for collection on the specified interval returning
// a channel for the subscriber to receive on.
func (s *statsCollector) collect(c *container.Container) chan interface{} {
return nil
}
// stopCollection closes the channels for all subscribers and removes
// the container from metrics collection.
func (s *statsCollector) stopCollection(c *container.Container) {
}
// unsubscribe removes a specific subscriber from receiving updates for a container's stats.
func (s *statsCollector) unsubscribe(c *container.Container, ch chan interface{}) {
// getSystemCPUUsage returns the host system's cpu usage in
// nanoseconds. An error is returned if the format of the underlying
// file does not match. This is a no-op on Windows.
func (s *statsCollector) getSystemCPUUsage() (uint64, error) {
return 0, nil
}

58
daemon/stats_unix.go Normal file
View File

@ -0,0 +1,58 @@
// +build !windows
package daemon
import (
"fmt"
"github.com/docker/docker/api/types"
"github.com/docker/docker/container"
)
// Resolve Network SandboxID in case the container reuse another container's network stack
func (daemon *Daemon) getNetworkSandboxID(c *container.Container) (string, error) {
curr := c
for curr.HostConfig.NetworkMode.IsContainer() {
containerID := curr.HostConfig.NetworkMode.ConnectedContainer()
connected, err := daemon.GetContainer(containerID)
if err != nil {
return "", fmt.Errorf("Could not get container for %s", containerID)
}
curr = connected
}
return curr.NetworkSettings.SandboxID, nil
}
func (daemon *Daemon) getNetworkStats(c *container.Container) (map[string]types.NetworkStats, error) {
sandboxID, err := daemon.getNetworkSandboxID(c)
if err != nil {
return nil, err
}
sb, err := daemon.netController.SandboxByID(sandboxID)
if err != nil {
return nil, err
}
lnstats, err := sb.Statistics()
if err != nil {
return nil, err
}
stats := make(map[string]types.NetworkStats)
// Convert libnetwork nw stats into engine-api stats
for ifName, ifStats := range lnstats {
stats[ifName] = types.NetworkStats{
RxBytes: ifStats.RxBytes,
RxPackets: ifStats.RxPackets,
RxErrors: ifStats.RxErrors,
RxDropped: ifStats.RxDropped,
TxBytes: ifStats.TxBytes,
TxPackets: ifStats.TxPackets,
TxErrors: ifStats.TxErrors,
TxDropped: ifStats.TxDropped,
}
}
return stats, nil
}

11
daemon/stats_windows.go Normal file
View File

@ -0,0 +1,11 @@
package daemon
import (
"github.com/docker/docker/api/types"
"github.com/docker/docker/container"
)
// Windows network stats are obtained directly through HCS, hence this is a no-op.
func (daemon *Daemon) getNetworkStats(c *container.Container) (map[string]types.NetworkStats, error) {
return make(map[string]types.NetworkStats), nil
}

25
docs/reference/commandline/stats.md
View File

@ -27,7 +27,7 @@ If you want more detailed information about a container's resource usage, use th
## Examples
Running `docker stats` on all running containers
Running `docker stats` on all running containers against a Linux daemon.
$ docker stats
CONTAINER CPU % MEM USAGE / LIMIT MEM % NET I/O BLOCK I/O
@ -35,9 +35,30 @@ Running `docker stats` on all running containers
9c76f7834ae2 0.07% 2.746 MiB / 64 MiB 4.29% 1.266 KB / 648 B 12.4 MB / 0 B
d1ea048f04e4 0.03% 4.583 MiB / 64 MiB 6.30% 2.854 KB / 648 B 27.7 MB / 0 B
Running `docker stats` on multiple containers by name and id.
Running `docker stats` on multiple containers by name and id against a Linux daemon.
$ docker stats fervent_panini 5acfcb1b4fd1
CONTAINER CPU % MEM USAGE/LIMIT MEM % NET I/O
5acfcb1b4fd1 0.00% 115.2 MiB/1.045 GiB 11.03% 1.422 kB/648 B
fervent_panini 0.02% 11.08 MiB/1.045 GiB 1.06% 648 B/648 B
Running `docker stats` on all running containers against a Windows daemon.
PS E:\> docker stats
CONTAINER CPU % PRIV WORKING SET NET I/O BLOCK I/O
09d3bb5b1604 6.61% 38.21 MiB 17.1 kB / 7.73 kB 10.7 MB / 3.57 MB
9db7aa4d986d 9.19% 38.26 MiB 15.2 kB / 7.65 kB 10.6 MB / 3.3 MB
3f214c61ad1d 0.00% 28.64 MiB 64 kB / 6.84 kB 4.42 MB / 6.93 MB
Running `docker stats` on multiple containers by name and id against a Windows daemon.
PS E:\> docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
3f214c61ad1d nanoserver "cmd" 2 minutes ago Up 2 minutes big_minsky
9db7aa4d986d windowsservercore "cmd" 2 minutes ago Up 2 minutes mad_wilson
09d3bb5b1604 windowsservercore "cmd" 2 minutes ago Up 2 minutes affectionate_easley
PS E:\> docker stats 3f214c61ad1d mad_wilson
CONTAINER CPU % PRIV WORKING SET NET I/O BLOCK I/O
3f214c61ad1d 0.00% 46.25 MiB 76.3 kB / 7.92 kB 10.3 MB / 14.7 MB
mad_wilson 9.59% 40.09 MiB 27.6 kB / 8.81 kB 17 MB / 20.1 MB

24
integration-cli/docker_api_containers_test.go
View File

@ -175,12 +175,10 @@ func (s *DockerSuite) TestContainerApiGetChanges(c *check.C) {
}
func (s *DockerSuite) TestGetContainerStats(c *check.C) {
// Problematic on Windows as Windows does not support stats
testRequires(c, DaemonIsLinux)
var (
name = "statscontainer"
)
dockerCmd(c, "run", "-d", "--name", name, "busybox", "top")
runSleepingContainer(c, "--name", name)
type b struct {
status int
@ -214,9 +212,7 @@ func (s *DockerSuite) TestGetContainerStats(c *check.C) {
}
func (s *DockerSuite) TestGetContainerStatsRmRunning(c *check.C) {
// Problematic on Windows as Windows does not support stats
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "busybox", "top")
out, _ := runSleepingContainer(c)
id := strings.TrimSpace(out)
buf := &integration.ChannelBuffer{make(chan []byte, 1)}
@ -251,10 +247,8 @@ func (s *DockerSuite) TestGetContainerStatsRmRunning(c *check.C) {
// previous test was just checking one stat entry so it didn't fail (stats with
// stream false always return one stat)
func (s *DockerSuite) TestGetContainerStatsStream(c *check.C) {
// Problematic on Windows as Windows does not support stats
testRequires(c, DaemonIsLinux)
name := "statscontainer"
dockerCmd(c, "run", "-d", "--name", name, "busybox", "top")
runSleepingContainer(c, "--name", name)
type b struct {
status int
@ -289,10 +283,8 @@ func (s *DockerSuite) TestGetContainerStatsStream(c *check.C) {
}
func (s *DockerSuite) TestGetContainerStatsNoStream(c *check.C) {
// Problematic on Windows as Windows does not support stats
testRequires(c, DaemonIsLinux)
name := "statscontainer"
dockerCmd(c, "run", "-d", "--name", name, "busybox", "top")
runSleepingContainer(c, "--name", name)
type b struct {
status int
@ -319,16 +311,14 @@ func (s *DockerSuite) TestGetContainerStatsNoStream(c *check.C) {
c.Assert(sr.status, checker.Equals, http.StatusOK)
s := string(sr.body)
// count occurrences of "read" of types.Stats
c.Assert(strings.Count(s, "read"), checker.Equals, 1, check.Commentf("Expected only one stat streamed, got %d", strings.Count(s, "read")))
// count occurrences of `"read"` of types.Stats
c.Assert(strings.Count(s, `"read"`), checker.Equals, 1, check.Commentf("Expected only one stat streamed, got %d", strings.Count(s, `"read"`)))
}
}
func (s *DockerSuite) TestGetStoppedContainerStats(c *check.C) {
// Problematic on Windows as Windows does not support stats
testRequires(c, DaemonIsLinux)
name := "statscontainer"
dockerCmd(c, "create", "--name", name, "busybox", "top")
dockerCmd(c, "create", "--name", name, "busybox", "ps")
type stats struct {
status int

43
integration-cli/docker_api_stats_test.go
View File

@ -20,7 +20,6 @@ import (
var expectedNetworkInterfaceStats = strings.Split("rx_bytes rx_dropped rx_errors rx_packets tx_bytes tx_dropped tx_errors tx_packets", " ")
func (s *DockerSuite) TestApiStatsNoStreamGetCpu(c *check.C) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "while true;do echo 'Hello'; usleep 100000; done")
id := strings.TrimSpace(out)
@ -37,15 +36,30 @@ func (s *DockerSuite) TestApiStatsNoStreamGetCpu(c *check.C) {
body.Close()
var cpuPercent = 0.0
cpuDelta := float64(v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage)
systemDelta := float64(v.CPUStats.SystemUsage - v.PreCPUStats.SystemUsage)
cpuPercent = (cpuDelta / systemDelta) * float64(len(v.CPUStats.CPUUsage.PercpuUsage)) * 100.0
if daemonPlatform != "windows" {
cpuDelta := float64(v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage)
systemDelta := float64(v.CPUStats.SystemUsage - v.PreCPUStats.SystemUsage)
cpuPercent = (cpuDelta / systemDelta) * float64(len(v.CPUStats.CPUUsage.PercpuUsage)) * 100.0
} else {
// Max number of 100ns intervals between the previous time read and now
possIntervals := uint64(v.Read.Sub(v.PreRead).Nanoseconds()) // Start with number of ns intervals
possIntervals /= 100 // Convert to number of 100ns intervals
possIntervals *= uint64(v.NumProcs) // Multiple by the number of processors
// Intervals used
intervalsUsed := v.CPUStats.CPUUsage.TotalUsage - v.PreCPUStats.CPUUsage.TotalUsage
// Percentage avoiding divide-by-zero
if possIntervals > 0 {
cpuPercent = float64(intervalsUsed) / float64(possIntervals) * 100.0
}
}
c.Assert(cpuPercent, check.Not(checker.Equals), 0.0, check.Commentf("docker stats with no-stream get cpu usage failed: was %v", cpuPercent))
}
func (s *DockerSuite) TestApiStatsStoppedContainerInGoroutines(c *check.C) {
testRequires(c, DaemonIsLinux)
out, _ := dockerCmd(c, "run", "-d", "busybox", "/bin/sh", "-c", "echo 1")
id := strings.TrimSpace(out)
@ -82,14 +96,17 @@ func (s *DockerSuite) TestApiStatsStoppedContainerInGoroutines(c *check.C) {
func (s *DockerSuite) TestApiStatsNetworkStats(c *check.C) {
testRequires(c, SameHostDaemon)
testRequires(c, DaemonIsLinux)
out, _ := runSleepingContainer(c)
id := strings.TrimSpace(out)
c.Assert(waitRun(id), checker.IsNil)
// Retrieve the container address
contIP := findContainerIP(c, id, "bridge")
net := "bridge"
if daemonPlatform == "windows" {
net = "nat"
}
contIP := findContainerIP(c, id, net)
numPings := 1
var preRxPackets uint64
@ -130,9 +147,14 @@ func (s *DockerSuite) TestApiStatsNetworkStats(c *check.C) {
postTxPackets += v.TxPackets
}
// Verify the stats contain at least the expected number of packets (account for ARP)
expRxPkts := 1 + preRxPackets + uint64(numPings)
expTxPkts := 1 + preTxPackets + uint64(numPings)
// Verify the stats contain at least the expected number of packets
// On Linux, account for ARP.
expRxPkts := preRxPackets + uint64(numPings)
expTxPkts := preTxPackets + uint64(numPings)
if daemonPlatform != "windows" {
expRxPkts++
expTxPkts++
}
c.Assert(postTxPackets, checker.GreaterOrEqualThan, expTxPkts,
check.Commentf("Reported less TxPackets than expected. Expected >= %d. Found %d. %s", expTxPkts, postTxPackets, pingouts))
c.Assert(postRxPackets, checker.GreaterOrEqualThan, expRxPkts,
@ -141,7 +163,6 @@ func (s *DockerSuite) TestApiStatsNetworkStats(c *check.C) {
func (s *DockerSuite) TestApiStatsNetworkStatsVersioning(c *check.C) {
testRequires(c, SameHostDaemon)
testRequires(c, DaemonIsLinux)
out, _ := runSleepingContainer(c)
id := strings.TrimSpace(out)

14
libcontainerd/client_windows.go
View File

@ -369,7 +369,19 @@ func (clnt *client) Resume(containerID string) error {
// Stats handles stats requests for containers
func (clnt *client) Stats(containerID string) (*Stats, error) {
return nil, errors.New("Windows: Stats not implemented")
// Get the libcontainerd container object
clnt.lock(containerID)
defer clnt.unlock(containerID)
container, err := clnt.getContainer(containerID)
if err != nil {
return nil, err
}
s, err := container.hcsContainer.Statistics()
if err != nil {
return nil, err
}
st := Stats(s)
return &st, nil
}
// Restore is the handler for restoring a container

4
libcontainerd/types_windows.go
View File

@ -26,8 +26,8 @@ type StateInfo struct {
UpdatePending bool // Indicates that there are some update operations pending that should be completed by a servicing container.
}
// Stats contains a stats properties from containerd.
type Stats struct{}
// Stats contains statics from HCS
type Stats hcsshim.Statistics
// Resources defines updatable container resource values.
type Resources struct{}

6
pkg/platform/architecture_windows.go
View File

@ -50,3 +50,9 @@ func runtimeArchitecture() (string, error) {
return "", fmt.Errorf("Unknown processor architecture")
}
}
// NumProcs returns the number of processors on the system
func NumProcs() uint32 {
syscall.Syscall(procGetSystemInfo.Addr(), 1, uintptr(unsafe.Pointer(&sysinfo)), 0, 0)
return sysinfo.dwNumberOfProcessors
}