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PLInstrument provides a reproducible instrumentation library, modeled on xUnit. The library is intended to facilitate the instrumentation of performance critical code, and provide comparable results over the lifetime of the code base. The library was developed primarily for the purpose of measuring code runtime on the iPhone, where CPU resources are significantly constrained. Example// If for some reason you wanted to measure the runtime of
// CGAffineTransform
- (PLInstrumentResult *) instrumentMirrorTransform {
PLIAbsoluteTime start, finish;
int iterations = 25000;
start = PLICurrentTime();
for (int i = 0 ; i < iterations; i++) {
CGAffineTransform mirrorTransform;
mirrorTransform = CGAffineTransformMakeTranslation(0.0, 200.0f);
mirrorTransform = CGAffineTransformScale(mirrorTransform, 1.0, -1.0);
}
finish = PLICurrentTime();
return [PLInstrumentResult resultWithStartTime: start endTime: finish iterations: iterations];
}Results: Instrumentation suite 'PLCoreGraphicsDemoInstruments' started at
2008-12-20 18:51:46 -0800
Instrumentation case -[PLCoreGraphicsDemoInstruments instrumentMirrorTransform]
completed (0.710000 μs/iteration) at 2008-12-20 18:51:46 -0800
Instrumentation suite 'PLCoreGraphicsDemoInstruments' finished at
2008-12-20 18:51:53 -0800DownloadDocumentation
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