17.56 18.47 14.99 30/40312 353731

#include <sys/resource.h>/*	@parm who的可能取值如下：		RUSAGE_SELF              Return resource usage statistics for the calling process,              which is the sum of resources used by all threads in the              process.
    RUSAGE_CHILDREN              Return resource usage statistics for all children of the              calling process that have terminated and been waited for.              These statistics will include the resources used by              grandchildren, and further removed descendants, if all of              the intervening descendants waited on their terminated              children.		    RUSAGE_THREAD (since Linux 2.6.26)              Return resource usage statistics for the calling thread.*/int getrusage(int who, struct rusage *usage);

struct  rusage {    struct timeval ru_utime;    /* user time used  用户态下程序运行时间*/    struct timeval ru_stime;    /* system time used  内核态下程序运行时间*/    long    ru_maxrss;      /* maximum resident set size 应用程序实际使用的内存，不包含SWAP，不包含共享的内存*/    long    ru_ixrss;       /* integral shared memory size  共享内存的大小*/    long    ru_idrss;       /* integral unshared data size  不共享的数据区的大小*/    long    ru_isrss;       /* integral unshared stack size 不共享的栈区的大小*/    long    ru_minflt;      /* page reclaims  页面回收数*/    long    ru_majflt;      /* page faults    页面错误数*/    long    ru_nswap;       /* swaps    交换页面的个数*/    long    ru_inblock;     /* block input operations   块输入操作数*/    long    ru_oublock;     /* block output operations  块输出操作数*/    long    ru_msgsnd;      /* messages sent  发送的消息*/    long    ru_msgrcv;      /* messages received  接受的消息*/    long    ru_nsignals;    /* signals received  接收的信号数*/    long    ru_nvcsw;       /* voluntary context switches  自愿上下文切换数*/    long    ru_nivcsw;      /* involuntary context switches 非自愿上下文切换数*/};