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Leopard Technical Q&As: Performance
Apple's suite of developer tools includes a number of optimization tools to help developers gather performace metrics, as well as identify and eliminate inefficiencies in their code. Code-profiling applications such as Shark show where an application is spending its time. Developers can use tools such as MallocDebug to help track down memory leaks and analyze memory use. Using these and other tools provided by Apple, developers can fine-tune their applications for high performance.
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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
Common QA and Roadmap for USB Software Development on Mac OS X (HTML)
QA1370: Roadmap for development of USB Software on Mac OS X and some Common Questions and Answers
 2006-02-28
Setting environment variables for user processes (HTML)
QA1067: Tells how to set environment variables for user processes.
 2001-10-25