Question

我想限制应用程序的CPU使用率，因为我使用的是Job Objects。基本思想是使用JOB_OBJECT_LIMIT_JOB_TIME和JobObjectNotificationLimitInformation类在100毫秒的CPU时间后获取通知，然后采取适当的操作。我使用的基本代码如下：

jobinfo.jobHandle = CreateJobObject(NULL, jobname);

ZeroMemory(&notificationLimit, sizeof(notificationLimit));
notificationLimit.LimitFlags = JOB_OBJECT_LIMIT_JOB_TIME;
/* miliseconds in 100-ns intervals. here we want notification after 100ms */
notificationLimit.PerJobUserTimeLimit.QuadPart = 100 * 10000;
SetInformationJobObject(jobinfo.jobHandle,JobObjectNotificationLimitInformation,
        &notificationLimit, sizeof(notificationLimit)))

jobinfo.portHandle = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, 1);

portInfo.CompletionKey = jobinfo.jobHandle;
portInfo.CompletionPort = jobinfo.portHandle;
SetInformationJobObject(jobinfo.jobHandle, JobObjectAssociateCompletionPortInformation,
        &portInfo, sizeof(portInfo))

AssignProcessToJobObject(jobinfo.jobHandle, hProc)

在单独的线程中，我使用GetQueuedCompletionStatus（）和QueryInformationJobObject（）来接收通知。在线程中接收通知的代码如下：

  for(;;)
  {
  DWORD dwNoOfBytes = 0;
  ULONG_PTR ulKey = 0;
  OVERLAPPED* pov = NULL;
  /* Wait for a completion notification.*/

  error = GetQueuedCompletionStatus(
                hPort,         /* Completion port handle */
                &dwNoOfBytes,  /* Bytes transferred */
                &ulKey,
                &pov,          /* OVERLAPPED structure */
                INFINITE       /* Notification time-out interval */
                );
  if (!error)
         printf("error");

  if(pov == NULL)
  {
      error = GetLastError();
      //continue;
  }

  /*
   * Associate actions to job based on notification message
       * and provide a way to exit the loop. Here we can do the handling
   * for the case if flag to disable CPU timer is set.
       */
       if (dwNoOfBytes == JOB_OBJECT_MSG_NOTIFICATION_LIMIT)
   {
    JOBOBJECT_LIMIT_VIOLATION_INFORMATION limitViolation;
    JOBOBJECT_NOTIFICATION_LIMIT_INFORMATION notificationLimit;

    ZeroMemory(&limitViolation, sizeof(limitViolation));
    error = QueryInformationJobObject(hJob,                                         
                                      JobObjectLimitViolationInformation,                                              
                                      &limitViolation, sizeof(limitViolation),
                  NULL);
    if(!error)
    {
        error = GetLastError();
        printf("QueryInformationJobObject failed with errorcode %d", error);
    }
    else if (dwNoOfBytes != JOB_OBJECT_MSG_NEW_PROCESS)
        print("unexpected message received from completion port");
}

在这里，我看到几个问题：一个。尽管API是，但GetQueuedCompletionStatus中的lpOverlapped始终为NULL 成功的，根据规格，这不应该是NULL。可能是什么原因呢？湾即使有，也会以JOB_OBJECT_MSG_NOTIFICATION_LIMIT的消息通知消息没有CPU使用率。 C。通知不会以指定的间隔到达，即100ms。

使用JOBOBJECT_NOTIFICATION_LIMIT_INFORMATION限制Windows上的CPU使用率

0 个答案: