Created
February 12, 2015 21:59
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Getting Linux CPU usage in GO
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package main | |
import ( | |
"fmt" | |
"io/ioutil" | |
"strconv" | |
"strings" | |
"time" | |
) | |
func getCPUSample() (idle, total uint64) { | |
contents, err := ioutil.ReadFile("/proc/stat") | |
if err != nil { | |
return | |
} | |
lines := strings.Split(string(contents), "\n") | |
for _, line := range(lines) { | |
fields := strings.Fields(line) | |
if fields[0] == "cpu" { | |
numFields := len(fields) | |
for i := 1; i < numFields; i++ { | |
val, err := strconv.ParseUint(fields[i], 10, 64) | |
if err != nil { | |
fmt.Println("Error: ", i, fields[i], err) | |
} | |
total += val // tally up all the numbers to get total ticks | |
if i == 4 { // idle is the 5th field in the cpu line | |
idle = val | |
} | |
} | |
return | |
} | |
} | |
return | |
} | |
func main() { | |
idle0, total0 := getCPUSample() | |
time.Sleep(3 * time.Second) | |
idle1, total1 := getCPUSample() | |
idleTicks := float64(idle1 - idle0) | |
totalTicks := float64(total1 - total0) | |
cpuUsage := 100 * (totalTicks - idleTicks) / totalTicks | |
fmt.Printf("CPU usage is %f%% [busy: %f, total: %f]\n", cpuUsage, totalTicks-idleTicks, totalTicks) | |
} |
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