C在Linux和Windows上获得cpu使用率 [英] C get cpu usage on linux and windows

问题描述

我在linux和windows上使用以下程序来获取当前进程的cpu利用率。

Linux：

I am using below programs on linux and windows to get cpu utilization of current processes.

Linux:

int main()
{
      int ret;
      char *buf;
      int i=0;
      int who= RUSAGE_SELF;
      struct rusage usage;
      struct rusage *p=&usage;

      ret=getrusage(who,p);
      printf("user time used: %16lf  %16lf\n",p->ru_utime.tv_sec,p->ru_utime.tv_usec);
    printf("system time used: %16lf  %16lf\n",p->ru_stime.tv_sec,p->ru_stime.tv_usec);

      system("ls");
      printf("user time used: %16lf  %16lf\n",p->ru_utime.tv_sec,p->ru_utime.tv_usec);
    printf("system time used: %16lf  %16lf\n", p->ru_stime.tv_sec,p->ru_stime.tv_usec);    

    return 0;
}

linux输出：

user time used: 0.000000 -1.999568
system time used: 0.000000 -1.999568
a.out check.c
user time used: 0.000000 -1.999568
system time used: 0.000000 -1.999568

这是否意味着系统（ls）命令没有执行任何cpu周期？我如何获得任何命令或程序使用的确切cpu周期？

Does this mean that the system("ls") command did not take any cpu cycles to execute? How do i get the exact cpu cycles used by any command or program?

我在Windows上遇到类似的问题。对于以下代码。

Windows：

I am facing similar problems on windows. for the below code.

Windows:

int main()
{
    int i=0;
    HANDLE hProcess = GetCurrentProcess();
    FILETIME ftCreation, ftExit, ftKernel, ftUser;
    SYSTEMTIME stKernel;
    SYSTEMTIME stUser;

    GetProcessTimes(hProcess, &ftCreation, &ftExit, &ftKernel, &ftUser);
    FileTimeToSystemTime(&ftKernel, &stKernel);
    FileTimeToSystemTime(&ftUser, &stUser);

    printf("\nTime in kernel mode = %uh %um %us %ums", stKernel.wHour,stKernel.wMinute, stKernel.wSecond, stKernel.wMilliseconds);
    printf("\nTime in user mode = %uh %um %us %ums \n", stUser.wHour,stUser.wMinute, stUser.wSecond, stUser.wMilliseconds);

    system("dir");

    GetProcessTimes(hProcess, &ftCreation, &ftExit, &ftKernel, &ftUser);
    FileTimeToSystemTime(&ftKernel, &stKernel);
    FileTimeToSystemTime(&ftUser, &stUser);

    printf("\nTime in kernel mode = %uh %um %us %ums", stKernel.wHour,stKernel.wMinute, stKernel.wSecond, stKernel.wMilliseconds);
    printf("\nTime in user mode = %uh %um %us %ums \n", stUser.wHour,stUser.wMinute, stUser.wSecond, stUser.wMilliseconds);
    system("PAUSE");
    return 0;
}

以上程序在Windows上输出 dev c ++：

Above program output on windows dev c++:

Time in kernel mode: 0h 0m 0s 15ms
Time in user mode: 0h 0m 0s 15ms
<directory listing>
Time in kernel mode: 0h 0m 0s 15ms
Time in user mode: 0h 0m 0s 15ms

您能否告诉我们如何才能获得上述程序的正确CPU使用率？还有办法了解IO使用情况或读写磁盘/内存的字符数吗？
提前致谢。

Can you please let me know how can we get correct cpu usage for the above programs? Also is there a way to get to know IO usage or number of characters read and write to disk/memory? Thanks in advance.

推荐答案

在Linux版本中，您要求 RUSAGE_SELF ，这是父进程的所有线程，而不是子进程的 RUSAGE_CHILDREN 。对于Linux下的IO使用，你需要2.6.20之后的内核，并查看 / proc / [pid] / io 。

In the Linux version you've asked for RUSAGE_SELF, which is all threads of the parent process, rather than RUSAGE_CHILDREN for child processes. For IO usage under Linux you'll need a kernel after 2.6.20, and look in /proc/[pid]/io.

我认为你在Windows上遇到了类似的问题。您需要使用 CreateProcess 而不是 system ，以便您可以获取子进程的句柄并记录其时间。对于Windows上的IO使用，我认为你需要使用WMI，这是一个很大的主题。

I think you have a similar problem on Windows. You'll need to use CreateProcess rather than system, so that you can get a handle to the child process and record its times. For IO usage on windows I think you'll need to use WMI, which is a large subject.

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