Microsoft KB Archive/100329

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INFO: CPU Quota Limits Not Enforced


The information in this article applies to:

  • Microsoft Win32 Application Programming Interface (API), used with:
    • the operating system: Microsoft Windows NT, versions 3.1, 3.5, 3.51, 4.0
    • the operating system: Microsoft Windows 2000


On page 88 of "Inside Windows NT," Table 4-1 indicates that a process object contains a quota limit for the maximum amount of processor time that the process can use.

This limit is not enforced in Windows NT versions 3.1, 3.5x , or 4.0.


The key to understanding Windows NT thread scheduling and resultant application behavior is knowing the central algorithm used. This algorithm is very simple, and is the same one a number of other operating systems use. It is "run the highest priority thread ready." A list of ready threads or processes exists; it is often called the "dispatch queue" or "eligible queue." The queue entries are in order based on their individual priority. A hardware-driven real-time clock or interval timer will periodically interrupt, passing control to a device driver that calls the process or thread scheduler. The thread scheduler will take the highest priority entry from the queue and dispatch it to run.

Additional query words: 3.10 3.50

Keywords : kbKernBase kbOSWin2000 kbThread kbDSupport kbGrpDSKernBase
Issue type : kbinfo
Technology : kbAudDeveloper kbWin32sSearch kbWin32API

Last Reviewed: October 27, 2000
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