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Leopard 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 Processor Cores on a Multi-Core System (HTML) (日本語 HTML)
QA1141: Describes how to disable processor cores on a multi-core system for testing purposes.
2008-09-16
Setting environment variables for user processes (HTML)
QA1067: Tells how to set environment variables for user processes.
2001-10-25