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Background ========== Sometimes it is necessary to reduce the number of processors on a system for testing, particularly performance testing. Instead of countless iterations of testing, shutdown, opening the hardware to remove a CPU, then putting it all back together, here's a procedure that makes the Windows NT operating system disable the use of multiple processors. Procedure ========= From the Registry select the following: HKEY_LOCAL_MACHINE on Local Machine SYSTEM\CurrentControlSet\Control\SessionManager At this point, find the RegisteredProcessors entry. The default hexidecimal value displayed represents the maximum number of processors the operating system will support. On some SMP systems, this value can be as large as 0x20 (32 decimal) even though hardware configurations today only accommodate a maximum of four processors. Double click on the RegisteredProcessors entry to bring up the DWORD editor. Then change the value to reflect the number of processors you want enabled in the system. For example, changing 0x20 to 1 will enable only one processor in the system. You must reboot in order for the system to recognize this configuration change. After rebooting, you can confirm the number of processors currently enabled from the Control Panel. Select the System icon and then the Environment tab. The environment variable NUMBER_OF_PROCESSORS will reflect your change. This procedure works on all multiprocessor Windows NT systems. source : http://www.partner.digital.com/www-swdev/pages/Home/TECH/faqs/wnt/processor.html | |||||
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