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c++ Programming Glossary: i7Why 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 valid for all the input values of data . Benchmarks Core i7 920 @ 3.5 GHz C Visual Studio 2010 x64 Release Branch Random..
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 longer get random slow downs on large powers of two. Core i7 920 @ 3.5 GHz Original code 8191 1.499 seconds 8192 2.122 seconds..
Performance degradation due to default initialisation of elements in standard containers http://stackoverflow.com/questions/15952412/performance-degradation-due-to-default-initialisation-of-elements-in-standard-co and a equivalent cheating method using my macbook's intel i7 chip with 4 cores 8 hyperthreads timing std vector vector n..
Why does gcc generate 15-20% faster code if I optimize for SIZE instead of speed? http://stackoverflow.com/questions/19470873/why-does-gcc-generate-15-20-faster-code-if-i-optimize-for-size-instead-of-speed Intel Core i3 3217U gcc 4.8.1 0.708s 0.944s O2 Intel Core i7 4770K gcc 4.8.1 0.296s 0.288s Os Intel Atom 330 gcc 4.8.1.. Intel Xeon E5405 gcc 4.8.1 0.603s 0.803s Intel Core i7 4770K gcc 4.8.1 0.296s 0.288s Update on Ivy Bridge based Core..
How to speed up my sparse matrix solver? http://stackoverflow.com/questions/2388196/how-to-speed-up-my-sparse-matrix-solver this can be run about 3500 times per second on an Intel i7 920. This means that the inner loop body runs 3500 128 128 57..
How can I compare the performance of log() and fp division in C++? http://stackoverflow.com/questions/2858483/how-can-i-compare-the-performance-of-log-and-fp-division-in-c particular platform darwin x86 for current hardware i5 i7 ~24 cycles for divide 1 ~35 cycles for log 2 . However because..
Asking for help to troubleshoot a c++ Eight queens puzzle code http://stackoverflow.com/questions/3816437/asking-for-help-to-troubleshoot-a-c-eight-queens-puzzle-code 8 i4 for int i5 0 i5 8 i5 for int i6 0 i6 8 i6 for int i7 0 i7 8 i7 board i0 0 1 board i1 1 1 board i2 2 1 board i3.. for int i5 0 i5 8 i5 for int i6 0 i6 8 i6 for int i7 0 i7 8 i7 board i0 0 1 board i1 1 1 board i2 2 1 board i3 3 1.. int i5 0 i5 8 i5 for int i6 0 i6 8 i6 for int i7 0 i7 8 i7 board i0 0 1 board i1 1 1 board i2 2 1 board i3 3 1 board..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali C 2010 x86 cl Ox EHsc Windows 7 Ultimate 64 bit Intel Core i7 8 GB RAM ostringstream 73.4 milliseconds 71.6 ms stringbuf 21.7..
How can I create directory tree in C++/Linux? http://stackoverflow.com/questions/675039/how-can-i-create-directory-tree-in-c-linux reproduced the problem on a MacBook Pro 2.3GHz Intel Core i7 running Mac OS X 10.7.4 and suggests that the problem is fixed..
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 speeds with SetFSB or something . For example on my Core i7 2600K rdtsc will always show the frequency at 3.4 GHz . But..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle which is fairly long achieves close to optimal on my Core i7 2600K. The key thing to note here is the massive amount of manual.. FLOPs 1.7294e 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.. less power and produce less heat. More Results Intel Core i7 920 @ 3.5 GHz Windows 7 Ultimate x64 Visual Studio 2010 SP1..
Performance 32 bit vs. 64 bit arithmetic http://stackoverflow.com/questions/8948918/performance-32-bit-vs-64-bit-arithmetic 64 bit OS Edit On current CPUs such Intel Core2 Duo i5 i7 etc. c c linux cpu share improve this question It depends..
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 zero values we just round to zero instead. Timings Core i7 920 @ 3.5 GHz Don't flush denormals to zero. 0.1f 0.564067 0..
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