linux进程设置优先级 example (linux 1~99 实时)

WUCANADA 2012-07-13

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linux进程设置优先级 example (linux 1~99 实时)

2009-06-17 17:59

linux2.6优先级为0-139，其中100-139为普通进程，0-99为实时进程。

/*pri.c*/

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sched.h>
#include <sys/time.h>
#include <sys/resource.h>
int main(int argc,char *argv[])
{
        unsigned int i=0,j=0,k=0,h;
        nice(-1);
        int pid[1];
        struct sched_param p[1];
        printf("max_pri is:%d,min_pri:%d\n ",sched_get_priority_max(2),sched_get_priority_min(2));
        struct sched_param para;
        para.sched_priority =23;
        sched_setscheduler(0,SCHED_FIFO,&para);
        printf("Parent pid is %d policy is %d, prio: %d\n",getpid(),sched_getscheduler(0),para.sched_priority);

while(1);
}

按照以下步骤：

gcc -o pri pri.c

./pri &

[root@FPC10 zhisxu]# ./pri
max_pri is:99,min_pri:1
Parent pid is 9461 policy is 1, prio: 23
[root@FPC10 ~]# top
top - 12:51:57 up 13 days, 3:18, 6 users, load average: 1.54, 0.57, 0.25
Tasks: 116 total,   3 running, 113 sleeping,   0 stopped,   0 zombie
Cpu(s): 87.5%us, 7.3%sy, 0.0%ni, 5.0%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%st
Mem:   2031980k total,   901064k used, 1130916k free,   272964k buffers
Swap: 2031608k total,        0k used, 2031608k free,   499884k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
9461 root -24 -1 1500 328 276 R 100 0.0 1:39.03 pri

好像应该也可以用下面这种方法实现： pid=getpid();

sched_setscheduler(pid, SCHED_FIFO, &param);