Microsoft KB Archive/100329

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INFO: CPU Quota Limits Not Enforced

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Q100329

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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

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SUMMARY
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.

MORE INFORMATION
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