mirror of https://github.com/etcd-io/dbtester.git
96 lines
2.0 KiB
Go
96 lines
2.0 KiB
Go
package proc
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/gyuho/linux-inspect/pkg/fileutil"
|
|
)
|
|
|
|
type loadAvgColumnIndex int
|
|
|
|
const (
|
|
load_avg_idx_load_avg_1_minute loadAvgColumnIndex = iota
|
|
load_avg_idx_load_avg_5_minute
|
|
load_avg_idx_load_avg_15_minute
|
|
load_avg_idx_kernel_scheduling_entities_with_slash
|
|
load_avg_idx_pid
|
|
)
|
|
|
|
// GetLoadAvg reads '/proc/loadavg'.
|
|
// Expected output is '0.37 0.47 0.39 1/839 31397'.
|
|
func GetLoadAvg() (LoadAvg, error) {
|
|
txt, err := readLoadAvg()
|
|
if err != nil {
|
|
return LoadAvg{}, err
|
|
}
|
|
return getLoadAvg(txt)
|
|
}
|
|
|
|
func readLoadAvg() (string, error) {
|
|
f, err := fileutil.OpenToRead("/proc/loadavg")
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
defer f.Close()
|
|
|
|
bts, err := ioutil.ReadAll(f)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return strings.TrimSpace(string(bts)), nil
|
|
}
|
|
|
|
func getLoadAvg(txt string) (LoadAvg, error) {
|
|
ds := strings.Fields(txt)
|
|
if len(ds) < 5 {
|
|
return LoadAvg{}, fmt.Errorf("not enough columns at %v", ds)
|
|
}
|
|
|
|
lavg := LoadAvg{}
|
|
|
|
avg1, err := strconv.ParseFloat(ds[load_avg_idx_load_avg_1_minute], 64)
|
|
if err != nil {
|
|
return LoadAvg{}, err
|
|
}
|
|
lavg.LoadAvg1Minute = avg1
|
|
|
|
avg5, err := strconv.ParseFloat(ds[load_avg_idx_load_avg_5_minute], 64)
|
|
if err != nil {
|
|
return LoadAvg{}, err
|
|
}
|
|
lavg.LoadAvg5Minute = avg5
|
|
|
|
avg15, err := strconv.ParseFloat(ds[load_avg_idx_load_avg_15_minute], 64)
|
|
if err != nil {
|
|
return LoadAvg{}, err
|
|
}
|
|
lavg.LoadAvg15Minute = avg15
|
|
|
|
slashed := strings.Split(ds[load_avg_idx_kernel_scheduling_entities_with_slash], "/")
|
|
if len(slashed) != 2 {
|
|
return LoadAvg{}, fmt.Errorf("expected '/' string in kernel scheduling entities field, got %v", slashed)
|
|
}
|
|
s1, err := strconv.ParseInt(slashed[0], 10, 64)
|
|
if err != nil {
|
|
return LoadAvg{}, err
|
|
}
|
|
lavg.RunnableKernelSchedulingEntities = s1
|
|
|
|
s2, err := strconv.ParseInt(slashed[1], 10, 64)
|
|
if err != nil {
|
|
return LoadAvg{}, err
|
|
}
|
|
lavg.CurrentKernelSchedulingEntities = s2
|
|
|
|
pid, err := strconv.ParseInt(ds[load_avg_idx_pid], 10, 64)
|
|
if err != nil {
|
|
return LoadAvg{}, err
|
|
}
|
|
lavg.Pid = pid
|
|
|
|
return lavg, nil
|
|
}
|