![]() If (correctsamples > line) correctscale = double(line) / correctsamples įor (Durations::const_iterator it = durations.begin() it != durations. During a context switch, the OS updates the MMU hardware to refer to the swapped-on processs. ![]() Time_duration duration = milliseconds(10) in tlis paper measure the cache- performance cost of context switches for a variety of programs executing. As an example, consider the following simple C program. This makes perfect sense given the earlier measurements, because each iteration of this test performs two context switches, and at 1.2 us per switch this is 2.4 us per iteration. Return boost::lexical_cast(val) + " occurrences" Running the benchmark on the same machine I used to measure the context switch times, I get 400,000 iterations per second (this is with taskset to pin to a single core). Should also work on MSVC and other platforms supported by Boost. Profiling the switching time is very difficult, but the in-kernel latency profiling tools, as well as oprofile (which can profile the kernel itself) will help you there.įor benchmarking the interactive application performance, I have written a small tool called latencybench that measures unexpected latency spikes: // Compile with g++ -o latencybench -lboost_thread-mt
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