285 lines
6.4 KiB
Go
285 lines
6.4 KiB
Go
// +build linux
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package cpu
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import (
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"context"
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"errors"
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"fmt"
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"os/exec"
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"strconv"
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"strings"
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"github.com/shirou/gopsutil/internal/common"
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)
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var CPUTick = float64(100)
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func init() {
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getconf, err := exec.LookPath("/usr/bin/getconf")
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if err != nil {
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return
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}
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out, err := invoke.CommandWithContext(context.Background(), getconf, "CLK_TCK")
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// ignore errors
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if err == nil {
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i, err := strconv.ParseFloat(strings.TrimSpace(string(out)), 64)
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if err == nil {
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CPUTick = i
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}
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}
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}
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func Times(percpu bool) ([]TimesStat, error) {
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return TimesWithContext(context.Background(), percpu)
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}
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func TimesWithContext(ctx context.Context, percpu bool) ([]TimesStat, error) {
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filename := common.HostProc("stat")
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var lines = []string{}
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if percpu {
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statlines, err := common.ReadLines(filename)
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if err != nil || len(statlines) < 2 {
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return []TimesStat{}, nil
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}
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for _, line := range statlines[1:] {
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if !strings.HasPrefix(line, "cpu") {
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break
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}
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lines = append(lines, line)
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}
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} else {
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lines, _ = common.ReadLinesOffsetN(filename, 0, 1)
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}
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ret := make([]TimesStat, 0, len(lines))
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for _, line := range lines {
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ct, err := parseStatLine(line)
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if err != nil {
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continue
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}
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ret = append(ret, *ct)
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}
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return ret, nil
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}
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func sysCPUPath(cpu int32, relPath string) string {
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return common.HostSys(fmt.Sprintf("devices/system/cpu/cpu%d", cpu), relPath)
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}
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func finishCPUInfo(c *InfoStat) error {
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var lines []string
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var err error
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var value float64
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if len(c.CoreID) == 0 {
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lines, err = common.ReadLines(sysCPUPath(c.CPU, "topology/core_id"))
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if err == nil {
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c.CoreID = lines[0]
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}
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}
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// override the value of c.Mhz with cpufreq/cpuinfo_max_freq regardless
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// of the value from /proc/cpuinfo because we want to report the maximum
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// clock-speed of the CPU for c.Mhz, matching the behaviour of Windows
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lines, err = common.ReadLines(sysCPUPath(c.CPU, "cpufreq/cpuinfo_max_freq"))
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// if we encounter errors below such as there are no cpuinfo_max_freq file,
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// we just ignore. so let Mhz is 0.
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if err != nil {
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return nil
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}
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value, err = strconv.ParseFloat(lines[0], 64)
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if err != nil {
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return nil
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}
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c.Mhz = value / 1000.0 // value is in kHz
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if c.Mhz > 9999 {
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c.Mhz = c.Mhz / 1000.0 // value in Hz
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}
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return nil
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}
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// CPUInfo on linux will return 1 item per physical thread.
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//
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// CPUs have three levels of counting: sockets, cores, threads.
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// Cores with HyperThreading count as having 2 threads per core.
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// Sockets often come with many physical CPU cores.
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// For example a single socket board with two cores each with HT will
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// return 4 CPUInfoStat structs on Linux and the "Cores" field set to 1.
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func Info() ([]InfoStat, error) {
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return InfoWithContext(context.Background())
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}
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func InfoWithContext(ctx context.Context) ([]InfoStat, error) {
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filename := common.HostProc("cpuinfo")
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lines, _ := common.ReadLines(filename)
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var ret []InfoStat
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var processorName string
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c := InfoStat{CPU: -1, Cores: 1}
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for _, line := range lines {
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fields := strings.Split(line, ":")
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if len(fields) < 2 {
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continue
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}
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key := strings.TrimSpace(fields[0])
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value := strings.TrimSpace(fields[1])
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switch key {
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case "Processor":
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processorName = value
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case "processor":
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if c.CPU >= 0 {
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err := finishCPUInfo(&c)
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if err != nil {
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return ret, err
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}
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ret = append(ret, c)
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}
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c = InfoStat{Cores: 1, ModelName: processorName}
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t, err := strconv.ParseInt(value, 10, 64)
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if err != nil {
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return ret, err
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}
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c.CPU = int32(t)
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case "vendorId", "vendor_id":
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c.VendorID = value
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case "cpu family":
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c.Family = value
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case "model":
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c.Model = value
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case "model name", "cpu":
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c.ModelName = value
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if strings.Contains(value, "POWER8") ||
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strings.Contains(value, "POWER7") {
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c.Model = strings.Split(value, " ")[0]
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c.Family = "POWER"
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c.VendorID = "IBM"
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}
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case "stepping", "revision":
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val := value
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if key == "revision" {
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val = strings.Split(value, ".")[0]
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}
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t, err := strconv.ParseInt(val, 10, 64)
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if err != nil {
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return ret, err
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}
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c.Stepping = int32(t)
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case "cpu MHz", "clock":
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// treat this as the fallback value, thus we ignore error
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if t, err := strconv.ParseFloat(strings.Replace(value, "MHz", "", 1), 64); err == nil {
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c.Mhz = t
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}
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case "cache size":
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t, err := strconv.ParseInt(strings.Replace(value, " KB", "", 1), 10, 64)
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if err != nil {
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return ret, err
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}
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c.CacheSize = int32(t)
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case "physical id":
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c.PhysicalID = value
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case "core id":
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c.CoreID = value
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case "flags", "Features":
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c.Flags = strings.FieldsFunc(value, func(r rune) bool {
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return r == ',' || r == ' '
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})
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case "microcode":
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c.Microcode = value
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}
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}
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if c.CPU >= 0 {
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err := finishCPUInfo(&c)
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if err != nil {
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return ret, err
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}
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ret = append(ret, c)
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}
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return ret, nil
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}
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func parseStatLine(line string) (*TimesStat, error) {
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fields := strings.Fields(line)
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if len(fields) == 0 {
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return nil, errors.New("stat does not contain cpu info")
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}
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if strings.HasPrefix(fields[0], "cpu") == false {
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return nil, errors.New("not contain cpu")
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}
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cpu := fields[0]
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if cpu == "cpu" {
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cpu = "cpu-total"
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}
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user, err := strconv.ParseFloat(fields[1], 64)
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if err != nil {
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return nil, err
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}
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nice, err := strconv.ParseFloat(fields[2], 64)
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if err != nil {
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return nil, err
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}
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system, err := strconv.ParseFloat(fields[3], 64)
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if err != nil {
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return nil, err
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}
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idle, err := strconv.ParseFloat(fields[4], 64)
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if err != nil {
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return nil, err
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}
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iowait, err := strconv.ParseFloat(fields[5], 64)
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if err != nil {
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return nil, err
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}
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irq, err := strconv.ParseFloat(fields[6], 64)
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if err != nil {
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return nil, err
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}
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softirq, err := strconv.ParseFloat(fields[7], 64)
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if err != nil {
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return nil, err
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}
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ct := &TimesStat{
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CPU: cpu,
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User: user / CPUTick,
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Nice: nice / CPUTick,
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System: system / CPUTick,
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Idle: idle / CPUTick,
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Iowait: iowait / CPUTick,
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Irq: irq / CPUTick,
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Softirq: softirq / CPUTick,
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}
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if len(fields) > 8 { // Linux >= 2.6.11
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steal, err := strconv.ParseFloat(fields[8], 64)
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if err != nil {
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return nil, err
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}
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ct.Steal = steal / CPUTick
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}
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if len(fields) > 9 { // Linux >= 2.6.24
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guest, err := strconv.ParseFloat(fields[9], 64)
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if err != nil {
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return nil, err
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}
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ct.Guest = guest / CPUTick
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}
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if len(fields) > 10 { // Linux >= 3.2.0
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guestNice, err := strconv.ParseFloat(fields[10], 64)
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if err != nil {
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return nil, err
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}
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ct.GuestNice = guestNice / CPUTick
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}
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return ct, nil
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}
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