Sample Code
OSX Driver and Kext Samples/ Dispatch_Compared/ Dispatch_Compared/ ReadMe.txt/
### Dispatch_Compared ### =========================================================================== USAGE: Dispatch_Compared [<n_benchmarks> [<n_folds> [<n_iterations>]]] All arguments are optional, though the earlier arguments must be specified to use the later ones. n_benchmarks - argument passed to dispatch_benchmark; more runs reduces fluctuations n_folds - how many times to run the work_function, to increase computation vs. overhead n_iterations - maximum # of times to iterate each API =========================================================================== DESCRIPTION: This sample code uses dispatch_benchmark to time the performance of a relatively compute-intensive loop using different APIs: - simple for loop - GCD: dispatch_apply - GCD: serial queue (private) - GCD: parallel queue (global) - GCD: multiple queues - POSIX threads Please note that this is NOT a "macro" benchmark that compares the real-world performance of different implementations. Rather, it is a *micro* benchmark that simply shows the overhead of invoking each API that number of times. Also note that a complete run with the default arguments can take several hours. =========================================================================== BUILD REQUIREMENTS: Mac OS X v10.6 or later =========================================================================== RUNTIME REQUIREMENTS: Mac OS X v10.6 or later =========================================================================== PACKAGING LIST: ReadMe.txt - This document main.c - Primary source code file Sample_Results.txt - Sample output plus discussion of results =========================================================================== CHANGES FROM PREVIOUS VERSIONS: Version 1.0 - First version. =========================================================================== Copyright (C) 2009 Apple Inc. All rights reserved.
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