linux下通过go语言获得系统进程cpu使用情况的方法

package main
import (
    "bytes"
    "log"
    "os/exec"
    "strconv"
    "strings"
)
type Process struct {
    pid int
    cpu float64
}
func main() {
    cmd := exec.Command("ps","aux")
    var out bytes.Buffer
    cmd.Stdout = &out
    err := cmd.Run()
    if err != nil {
        log.Fatal(err)
    }
    processes := make([]*Process,0)
    for {
        line,err := out.ReadString('n')
        if err!=nil {
            break;
        }
        tokens := strings.Split(line," ")
        ft := make([]string,0)
        for _,t := range(tokens) {
            if t!="" && t!="t" {
                ft = append(ft,t)
            }
        }
        log.Println(len(ft),ft)
        pid,err := strconv.Atoi(ft[1])
        if err!=nil {
            continue
        }
        cpu,err := strconv.ParseFloat(ft[2],64)
        if err!=nil {
            log.Fatal(err)
        }
        processes = append(processes,&Process{pid,cpu})
    }
    for _,p := range(processes) {
        log.Println("Process ",p.pid," takes ",p.cpu," % of the CPU")
    }
}