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c++ Programming Glossary: benchmarkLinux C++: how to profile time wasted due to cache misses? http://stackoverflow.com/questions/2486840/linux-c-how-to-profile-time-wasted-due-to-cache-misses wasted due to cache misses I know that I can use gprof to benchmark my code. However I have this problem I have a smart pointer..
Floating point vs integer calculations on modern hardware http://stackoverflow.com/questions/2550281/floating-point-vs-integer-calculations-on-modern-hardware something from main memory I know the correct answer is to benchmark on the target hardware what would be a good way to test this.. . Short of spending my entire day running hundreds of benchmarks making graphs etc. is there something I can do to get a reasonable..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali the C standard library iostream. It would be nice to see benchmarks on other systems and commentary on things common implementations.. It isn't being used polymorphically in this simple micro benchmark so that doesn't explain it. c performance iostream share..
C++ performance challenge: integer to std::string conversion http://stackoverflow.com/questions/4351371/c-performance-challenge-integer-to-stdstring-conversion Besides better algorithms I'd also like to get some benchmarks on several different platforms and compilers let's use MB s.. believe that the code for my algorithm I know the sprintf benchmark takes some shortcuts now fixed is well defined behavior by the..
Which is the fastest algorithm to find prime numbers? http://stackoverflow.com/questions/453793/which-is-the-fastest-algorithm-to-find-prime-numbers
http://stackoverflow.com/questions/45972/mmap-vs-reading-blocks question mmap is way faster. You might write a simple benchmark to prove it to yourself char data 0x1000 std ifstream in file.bin.. the victims Update I should also add the caveat that this benchmark would look quite different in Windows because Microsoft implemented..
Convert Python program to C/C++ code? http://stackoverflow.com/questions/4650243/convert-python-program-to-c-c-code good at . I thought about writing one simple algorithm and benchmark it against such a converted solution. If that alone is significantly..
How to get IOStream to perform better? http://stackoverflow.com/questions/5166263/how-to-get-iostream-to-perform-better the platform The code in full here for those interested in benchmarking #include fstream #include iostream #include iomanip #include.. cstdio #include sys time.h template typename Func double benchmark Func f size_t iterations f timeval a b gettimeofday a 0 for.. std ios_base sync_with_stdio false double ctime benchmark cread iterations double cpptime benchmark cppread iterations..
Is C# really slower than say C++? http://stackoverflow.com/questions/5326269/is-c-sharp-really-slower-than-say-c my two cents worth on that subject as well. Most of these benchmarks are a bit like teenagers deciding to race their cars and whoever.. in one crucial way though they guy who's publishing the benchmark gets to drive both cars. By some strange chance his car always.. your car as fast as it would go. It's easy to write a poor benchmark that produces results that mean next to nothing. Almost anybody..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle will be needed. These are beyond the scope of this benchmark. #include emmintrin.h #include omp.h #include iostream using.. rid of the normalization step. However since I wrote the benchmark to measure power consumption and temperature I had to make sure..
Fastest way to find the number of lines in a text (C++) http://stackoverflow.com/questions/843154/fastest-way-to-find-the-number-of-lines-in-a-text-c to be the best long term solution. Edit I just ran a small benchmark on this and using the buffered approach buffer size 1024K seems..
Why is reading lines from stdin much slower in C++ than Python? http://stackoverflow.com/questions/9371238/why-is-reading-lines-from-stdin-much-slower-in-c-than-python the performance implications. Thanks again Edit 7 Tiny benchmark addendum and recap Hello HN readers For completeness I thought.. code that wasn't related to the question. c python benchmarking readline getline share improve this question By default..
http://stackoverflow.com/questions/13343874/boost-spirit-qi-slow own. Here is my code for the region.tbl file of the TCPH Benchmark struct region int r_regionkey char r_name 25 char r_comment..
C++ use SSE instructions for comparing huge vectors of ints http://stackoverflow.com/questions/17791892/c-use-sse-instructions-for-comparing-huge-vectors-of-ints help since I know nothing about SSE. Thanks in advance Benchmark int nofTestCases 10000000 vector int nodeIds nofTestCases vector..
http://stackoverflow.com/questions/4340396/does-the-c-standard-mandate-poor-performance-for-iostreams-or-am-i-just-deali that are competitive with manual buffer management Benchmarks To get matters moving I've written a couple of short programs.. keep up when they are responsible for formatting as well Benchmark Timing All these are per iteration of the outer k loop. On ideone..
http://stackoverflow.com/questions/5693477/ccli-does-the-native-parts-written-in-pure-c-but-compiled-in-cli-are-as-fas war may begin. This is a link that goes to the Language Benchmark Game that clearly states the C C as a speed winners. I am asking..
Benchmark C++ vs Java, Unrealistic results http://stackoverflow.com/questions/7570484/benchmark-c-vs-java-unrealistic-results C vs Java Unrealistic results I did a simple test I know C..
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 countermeasures into my y cruncher Multi threaded Pi Benchmark . But for the most part I'm not entirely successful in implementing..
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 double end start CLOCKS_PER_SEC endl system pause return 0 Benchmark Results EDIT Results on an actual Core 2 architecture machine..
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