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Leopard Reference Library: Performance
Apple provides tools, technologies, and programming interfaces to measure, evaluate, and optimize performance. Developers can use these tools to improve the performance of hardware devices and software.

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Affinity API Release Notes for Mac OS X v10.5 (HTML)
Explains how to influence which CPU core runs a group of threads (for performance optimization).
Release Notes 2007-10-31
BSDLLCTest (HTML) (DMG) (ZIP)
Program sample demonstrates how to send and receive raw LLC Ethernet packets.
Sample Code 2003-06-12
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.
Technical Q&As 2008-09-16
dist_fft (HTML) (DMG) (ZIP)
Gigaelement FFTs on Apple G5 clusters
Sample Code 2004-08-23
I/O Kit Fundamentals (HTML) (PDF)
The basics of developing device drivers. Includes descriptions of I/O Kit families.
Guides 2007-05-17
Memory Usage Performance Guidelines (HTML) (PDF)
Guidelines for improving the performance of memory-related code.
Guides 2006-06-28
Optimization Strategies for Mac OS X (HTML)
TN1174: Achieving the best possible performance in your applications.
Technical Notes 1999-09-01
OTScheduleDeferredTask When Task Running (HTML) (日本語 HTML)
NW52: Describes what happens when you use OTScheduleDefferedTask to schedule a task that is running.
Technical Q&As 1997-10-13
The "packages" node in the device tree (HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
Technical Q&As 2006-02-22
Sleep vs. Doze on Mac OS X (HTML)
QA1309: Discusses and demonstrates sleep versus doze detection on Machintosh Mac OS X
Technical Q&As 2003-10-09
Thermal considerations for Mac Pro FB-DIMMs (HTML)
TN2156: Design considerations and specifications for the AMB and Heat spreader for the Mac Pro
Technical Notes 2006-11-10
VelEng FFT (HTML) (DMG) (ZIP)
G4 Velocity Engine implementation of Fast Fourier Transform (FFT) and associated convolution/correlation routines.
Sample Code 2003-01-14