如何限制Windows上进程的CPU使用率？

Question

I need to control my application's CPU usage to a certain limit. My application will run on Win XP, Vista, Win7 and Windows 8.

I tried implementing to get the current process's CPU usage and using the Sleep() method.(I used the APIs GetProcessTimes& GetSystemTimes)

pseudo code:

    for(;;)
    {
         //Get the current process's CPU Usage
         int cpuUsage  = CalculateCPUUsage();
         if(cpuUsage > 50)
             Sleep(10)
         else
        {
           //Project implementation code
        }    
    }

Question:

Can I write an application to monitor a process's CPU Usage and whenever the CPU reaches the allowed limit, stop the process and continue it.

Thanks in advance for your help.

Answer 1

You can limit the CPU usage of your process or any other process by adding the process of interest to a Job object, and placing limits on the Job object.

One of the resource limits which can be configured for Job objects is CPU usage:

• JOBOBJECT_BASIC_LIMIT_INFORMATION available since Windows XP and 2003
• JOBOBJECT_CPU_RATE_CONTROL_INFORMATION new in Windows 8 and Server 2012.

If you have to use the pre-Windows 8 approach, pay careful attention to the note:

To register for notification when this limit is exceeded without terminating processes, use the SetInformationJobObject function with the JobObjectNotificationLimitInformation information class

Answer 2

如果您只是想给该进程一个较低的优先级以便更好地使用其他线程，则可以使用SetThreadPriority设置其优先级，例如：

SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);