linux cpu信息

/*
who参数
RUSAGE_SELF：只返回当前程序的CPU时间占用信息
RUSAGE_CHILDREN：还包括子进程的CPU时间占用信息
*/int getrusage(int who, struct rusage *usage);

举例

#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>int main()
{
struct rusage r_usage;getrusage(RUSAGE_SELF, &r_usage);printf("CPU usage: User = %ld.%06ld, System = %ld.%06ld\n",
r_usage.ru_utime.tv_sec, r_usage.ru_utime.tv_usec,
r_usage.ru_stime.tv_sec, r_usage.ru_stime.tv_usec);return 0;
}

CPU usage: User = 0.000000, System = 0.000000

优先级

缺省优先级是0，合法优先级范围是-20到+20。数值越低代表有较高的优先次序，执行会较频繁

/*
who参数
PRIO_PROCESS 为进程识别码
PRIO_PGRP 为进程的组识别码
PRIO_USER 为用户识别码
*/
int getpriority(int which, int who);
int setpriority(int which, int who, int prio);

举例

#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>int main()
{
int priority;priority = getpriority(PRIO_PROCESS, getpid());
printf("Current priority = %d\n", priority);return 0;
}

Current priority = 0