telegraf/plugins/system/ps/cpu/cpu_linux.go

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2015-04-04 00:22:31 +00:00
// +build linux
package cpu
import (
"errors"
"os/exec"
"strconv"
"strings"
common "github.com/influxdb/telegraf/plugins/system/ps/common"
2015-04-04 00:22:31 +00:00
)
func CPUTimes(percpu bool) ([]CPUTimesStat, error) {
filename := "/proc/stat"
var lines = []string{}
if percpu {
var startIdx uint = 1
for {
linen, _ := common.ReadLinesOffsetN(filename, startIdx, 1)
line := linen[0]
if !strings.HasPrefix(line, "cpu") {
break
}
lines = append(lines, line)
startIdx += 1
}
} else {
lines, _ = common.ReadLinesOffsetN(filename, 0, 1)
}
ret := make([]CPUTimesStat, 0, len(lines))
for _, line := range lines {
ct, err := parseStatLine(line)
if err != nil {
continue
}
ret = append(ret, *ct)
}
return ret, nil
}
func CPUInfo() ([]CPUInfoStat, error) {
filename := "/proc/cpuinfo"
lines, _ := common.ReadLines(filename)
var ret []CPUInfoStat
var c CPUInfoStat
for _, line := range lines {
fields := strings.Split(line, ":")
if len(fields) < 2 {
if c.VendorID != "" {
ret = append(ret, c)
}
continue
}
key := strings.TrimSpace(fields[0])
value := strings.TrimSpace(fields[1])
switch key {
case "processor":
c = CPUInfoStat{}
t, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return ret, err
}
c.CPU = int32(t)
case "vendor_id":
c.VendorID = value
case "cpu family":
c.Family = value
case "model":
c.Model = value
case "model name":
c.ModelName = value
case "stepping":
t, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return ret, err
}
c.Stepping = int32(t)
case "cpu MHz":
t, err := strconv.ParseFloat(value, 64)
if err != nil {
return ret, err
}
c.Mhz = t
case "cache size":
t, err := strconv.ParseInt(strings.Replace(value, " KB", "", 1), 10, 64)
if err != nil {
return ret, err
}
c.CacheSize = int32(t)
case "physical id":
c.PhysicalID = value
case "core id":
c.CoreID = value
case "cpu cores":
t, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return ret, err
}
c.Cores = int32(t)
case "flags":
c.Flags = strings.Split(value, ",")
}
}
return ret, nil
}
var CLK_TCK = 100
func init() {
out, err := exec.Command("getconf", "CLK_TCK").CombinedOutput()
if err == nil {
i, err := strconv.Atoi(strings.TrimSpace(string(out)))
if err == nil {
CLK_TCK = i
}
}
}
func parseStatLine(line string) (*CPUTimesStat, error) {
fields := strings.Fields(line)
if strings.HasPrefix(fields[0], "cpu") == false {
// return CPUTimesStat{}, e
return nil, errors.New("not contain cpu")
}
cpu := fields[0]
if cpu == "cpu" {
cpu = "cpu-total"
}
user, err := strconv.ParseFloat(fields[1], 64)
if err != nil {
return nil, err
}
nice, err := strconv.ParseFloat(fields[2], 64)
if err != nil {
return nil, err
}
system, err := strconv.ParseFloat(fields[3], 64)
if err != nil {
return nil, err
}
idle, err := strconv.ParseFloat(fields[4], 64)
if err != nil {
return nil, err
}
iowait, err := strconv.ParseFloat(fields[5], 64)
if err != nil {
return nil, err
}
irq, err := strconv.ParseFloat(fields[6], 64)
if err != nil {
return nil, err
}
softirq, err := strconv.ParseFloat(fields[7], 64)
if err != nil {
return nil, err
}
stolen, err := strconv.ParseFloat(fields[8], 64)
if err != nil {
return nil, err
}
cpu_tick := float64(CLK_TCK)
ct := &CPUTimesStat{
CPU: cpu,
User: float64(user) / cpu_tick,
Nice: float64(nice) / cpu_tick,
System: float64(system) / cpu_tick,
Idle: float64(idle) / cpu_tick,
Iowait: float64(iowait) / cpu_tick,
Irq: float64(irq) / cpu_tick,
Softirq: float64(softirq) / cpu_tick,
Stolen: float64(stolen) / cpu_tick,
}
if len(fields) > 9 { // Linux >= 2.6.11
steal, err := strconv.ParseFloat(fields[9], 64)
if err != nil {
return nil, err
}
ct.Steal = float64(steal)
}
if len(fields) > 10 { // Linux >= 2.6.24
guest, err := strconv.ParseFloat(fields[10], 64)
if err != nil {
return nil, err
}
ct.Guest = float64(guest)
}
if len(fields) > 11 { // Linux >= 3.2.0
guestNice, err := strconv.ParseFloat(fields[11], 64)
if err != nil {
return nil, err
}
ct.GuestNice = float64(guestNice)
}
return ct, nil
}