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Technical Q&As: Performance
The performance of Darwin applications can be measured, evaluated, and optimized using Apple's developer tools, technologies, and programming interfaces. Developers can fine-tune their applications for high performance using tools such as the Shark code-profiling application, features such as multiprocessing, and APIs such as the one for the vDSP library.

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Disabling a Processor on a Multiprocessor System (HTML) ()
QA1141: Describes how to disable a processor on a multiprocessor system for testing purposes.
2002-05-22
Setting environment variables for user processes (HTML)
QA1067: Tells how to set environment variables for user processes.
2001-10-25