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

巴特西

linux cpu信息

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