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Internet Information Services (IIS) 6 Resource Kit by The Microsoft IIS Team

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Preventing Processor Bottlenecks

Servers running IIS 6.0 rely on the speed and efficiency of their processors. IIS 6.0 code is multithreaded for efficient scaling on uniprocessor and multiprocessor computers, and is largely self-tuning. Even so, processor bottlenecks can occur on very active servers.

A processor bottleneck occurs when one or more processes consume the majority of the processor time. This forces threads that are ready to be executed to wait in a queue for processor time. Processor bottlenecks can occur on multiprocessor computers even when only a single processor is fully loaded, if the work in the queue cannot be — or is not — distributed to the other processors. Because a processor bottleneck is not centered in other components, ...

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