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cpu.go
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cpu.go
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package cpu
import (
"fmt"
"sync/atomic"
"time"
)
const (
interval time.Duration = time.Millisecond * 500
)
var (
stats CPU
usage uint64
)
// CPU is cpu stat usage.
type CPU interface {
Usage() (u uint64, e error)
Info() Info
}
func init() {
var (
err error
)
stats, err = newCgroupCPU()
if err != nil {
// fmt.Printf("cgroup cpu init failed(%v),switch to psutil cpu\n", err)
stats, err = newPsutilCPU(interval)
if err != nil {
panic(fmt.Sprintf("cgroup cpu init failed!err:=%v", err))
}
}
go func() {
ticker := time.NewTicker(interval)
defer ticker.Stop()
for {
<-ticker.C
u, err := stats.Usage()
if err == nil && u != 0 {
atomic.StoreUint64(&usage, u)
}
}
}()
}
// Stat cpu stat.
type Stat struct {
Usage uint64 // cpu use ratio.
}
// Info cpu info.
type Info struct {
Frequency uint64
Quota float64
}
// ReadStat read cpu stat.
func ReadStat(stat *Stat) {
stat.Usage = atomic.LoadUint64(&usage)
}
// GetInfo get cpu info.
func GetInfo() Info {
return stats.Info()
}