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c++ Programming Glossary: ghzWhy is processing a sorted array faster than an unsorted array? http://stackoverflow.com/questions/11227809/why-is-processing-a-sorted-array-faster-than-an-unsorted-array the input values of data . Benchmarks Core i7 920 @ 3.5 GHz C Visual Studio 2010 x64 Release Branch Random seconds 11.777..
Why is my program slow when looping over exactly 8192 elements? http://stackoverflow.com/questions/12264970/why-is-my-program-slow-when-looping-over-exactly-8192-elements slow downs on large powers of two. Core i7 920 @ 3.5 GHz Original code 8191 1.499 seconds 8192 2.122 seconds 8193 1.582..
Very poor boost::lexical_cast performance http://stackoverflow.com/questions/1250795/very-poor-boostlexical-cast-performance lexical_cast performance Windows XP SP3. Core 2 Duo 2.0 GHz. I'm finding the boost lexical_cast performance to be extremely..
Finding out the CPU clock frequency (per core, per processor) http://stackoverflow.com/questions/8351944/finding-out-the-cpu-clock-frequency-per-core-per-processor Core i7 2600K rdtsc will always show the frequency at 3.4 GHz . But in reality it idles at 1.6 GHz and clocks up to 4.6 GHz.. the frequency at 3.4 GHz . But in reality it idles at 1.6 GHz and clocks up to 4.6 GHz under load via the overclocked Turbo.. . But in reality it idles at 1.6 GHz and clocks up to 4.6 GHz under load via the overclocked Turbo Boost multiplier at 46x..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle produces the following output on an Intel Core i5 750 2.66 GHz addmul 0.270 s 3.707 Gflops res 1.326463 i.e. just about 1.4.. 010 sum 2.22652 The machine is a Core i7 2600K @ 4.4 GHz. Theoretical SSE peak is 4 flops 4.4 GHz 17.6 GFlops . This.. i7 2600K @ 4.4 GHz. Theoretical SSE peak is 4 flops 4.4 GHz 17.6 GFlops . This code achieves 17.3 GFlops not bad. Output..
Why is one loop so much slower than two loops? http://stackoverflow.com/questions/8547778/why-is-one-loop-so-much-slower-than-two-loops architecture machine 2 x Intel Xeon X5482 Harpertown @ 3.2 GHz #define ALLOCATE_SEPERATE #define ONE_LOOP 00600020 006D0020..
Why does changing 0.1f to 0 slow down performance by 10x? http://stackoverflow.com/questions/9314534/why-does-changing-0-1f-to-0-slow-down-performance-by-10x we just round to zero instead. Timings Core i7 920 @ 3.5 GHz Don't flush denormals to zero. 0.1f 0.564067 0 26.7669 Flush..
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