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c++ Programming Glossary: openmphttp://stackoverflow.com/questions/10587598/simd-prefix-sum-on-intel-cpu both passes in parallel using multiple threads e.g. with OpenMP . The second pass you can also use SIMD since a constant value.. 2 n m w I posted the code for the general case which uses OpenMP for the threading and intrinsics for the SSE code and discuss..
http://stackoverflow.com/questions/10850155/openmp-for-schedule for schedule I'working with OpenMP C and I have some questions.. for schedule I'working with OpenMP C and I have some questions 1 What is #pragma omp for schedule.. fashion. The nice thing with static scheduling is that OpenMP run time guarantees that if you have two separate loops with..
OpenMP set_num_threads() is not working http://stackoverflow.com/questions/11095309/openmp-set-num-threads-is-not-working set_num_threads is not working I am writing a parallel program.. is not working I am writing a parallel program using OpenMP in C . I want to control the number of threads in the program.. omp_set_num_threads still doesn't guarantee that the OpenMP runtime will use exactly the specified number of threads. omp_set_num_threads..
C++ OpenMP Parallel For Loop - Alternatives to std::vector [closed] http://stackoverflow.com/questions/18669296/c-openmp-parallel-for-loop-alternatives-to-stdvector OpenMP Parallel For Loop Alternatives to std vector closed Based on.. Alternatives to std vector closed Based on this thread OpenMP and STL vector which data structures are good alternatives for..
How to speed up my sparse matrix solver? http://stackoverflow.com/questions/2388196/how-to-speed-up-my-sparse-matrix-solver this from the beginning. Parallelizing over 4 cores using OpenMP pragmas. I have to change to the Jacobi algorithm to avoid reads..
App does not run with VS 2008 SP1 DLLs, previous version works with RTM versions http://stackoverflow.com/questions/59635/app-does-not-run-with-vs-2008-sp1-dlls-previous-version-works-with-rtm-versions will bind to the latest version of all VC libs CRT MFC ATL OpenMP . Then check what the embedded manifest says. Download XM Resource..
How to Enforce C++ compiler to use specific CRT version? http://stackoverflow.com/questions/730134/how-to-enforce-c-compiler-to-use-specific-crt-version does not link against other Side by Side components MFC OpenMP etc. . If your application is non trivial I'd be surprised if..
http://stackoverflow.com/questions/8325566/openmp-and-cpu-affinity and CPU affinity Will sched_setaffinity or pthread_attr_setaffinity_np.. work to set thread affinity under OpenMP Related CPU Affinity c c posix openmp share improve this.. set in ~half of specOMP results. There are some additional OpenMP performance tuning settings in results too. E.g. For intel compiler..
http://stackoverflow.com/questions/10850155/openmp-for-schedule command do. And please a explained example. Thanks. c openmp share improve this question Others have since answered most.. 2 iter 0d tid 0d n i omp_get_thread_num return 0 icc openmp o dyn.x dyn.c OMP_NUM_THREADS 8 . dyn.x sort 1 iter 0 tid 2..
http://stackoverflow.com/questions/10939158/openmp-performance to get the parallelism going... c c multithreading openmp share improve this question It's hard to know for sure what..
OpenMP set_num_threads() is not working http://stackoverflow.com/questions/11095309/openmp-set-num-threads-is-not-working the number of threads c multithreading numbers set openmp share improve this question Besides calling omp_get_num_threads..
Compilation fails with OpenMP on Mac OS X Lion (memcpy and SSE intrinsics) http://stackoverflow.com/questions/12932107/compilation-fails-with-openmp-on-mac-os-x-lion-memcpy-and-sse-intrinsics Developer SDKs MacOSX10.7.sdk mmacosx version min 10.7 fopenmp Undefined symbols for architecture x86_64 ___builtin_ia32_shufpd.. status The code compiles just fine when not using the fopenmp flag to gcc . Now I googled around and found a solution for.. the D_FORTIFY_SOURCE 0 flag eventually do c c xcode osx openmp share improve this question This is a bug in the way Apple's..
How does the omp ordered clause work? http://stackoverflow.com/questions/13224155/how-does-the-omp-ordered-clause-work static schedule affect performance c parallel processing openmp share improve this question The ordered clause works like..
May compiler optimizations be inhibited by multi-threading? http://stackoverflow.com/questions/16807766/may-compiler-optimizations-be-inhibited-by-multi-threading at the time the question was posed. c c multithreading openmp compiler optimization share improve this question I think.. here. Before however here's gcc 4.8's documentation on fopenmp fopenmp Enable handling of OpenMP directives #pragma omp in.. Before however here's gcc 4.8's documentation on fopenmp fopenmp Enable handling of OpenMP directives #pragma omp in C C and..
C++ OpenMP Parallel For Loop - Alternatives to std::vector [closed] http://stackoverflow.com/questions/18669296/c-openmp-parallel-for-loop-alternatives-to-stdvector and the vector might require resizing during the loop. c openmp std share improve this question The question you link was.. and it is much better integrated with C C 11 features than openmp then you don't need to use openmp to create a parallel_for Here.. C C 11 features than openmp then you don't need to use openmp to create a parallel_for Here is a nice example of parallel_for..
In multithreaded C/C++, does malloc/new lock the heap when allocating memory http://stackoverflow.com/questions/4524437/in-multithreaded-c-c-does-malloc-new-lock-the-heap-when-allocating-memory know for Windows and Mac as well. c multithreading malloc openmp share improve this question There could be improvements..
OpenMP: Huge performance differences between Visual C++ 2008 and 2010 http://stackoverflow.com/questions/4738045/openmp-huge-performance-differences-between-visual-c-2008-and-2010 on the same machinje c performance visual studio 2010 openmp share improve this question In 2010 OpenMP each worker thread..
Does multithreading emphasize memory fragmentation? http://stackoverflow.com/questions/5875989/does-multithreading-emphasize-memory-fragmentation randomly sized memory chunks with 4 or more threads using openmp's parallel for construct the program seems to start leaking.. ends. All this work is done for each thread generated by openmp. This memory allocation scheme allows us to expect a memory.. with gcc 4.3 4.4 and 4.6 trunk . c multithreading memory openmp fragmentation share improve this question Ok picked up the..
http://stackoverflow.com/questions/8325566/openmp-and-cpu-affinity affinity under OpenMP Related CPU Affinity c c posix openmp share improve this question Yes named calls will work to.. loop for known number of threads . As I know almost every openmp allows to set affinity via environment. The name of environment.. For sun compiler export SUNW_MP_PROCBIND TRUE For gcc pre openmp 3.1 export GOMP_CPU_AFFINITY 0 63 where 63 is maximum CPU number..
how to achieve 4 FLOPs per cycle http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle 5.6 Gflops out of 10.66 Gflops 2.1 flops cycle cl O2 openmp removed 10.1 Gflops out of 10.66 Gflops 3.8 flops cycle It all.. @ 3.2 GHz Ubuntu Linux 10 x64 GCC 4.5.2 x64 O2 msse3 fopenmp Threads 1 Seconds 78.3357 FP Ops 960000000000 FLOPs 1.22549e..
C++11 Thread safety of Random number generators http://stackoverflow.com/questions/8813592/c11-thread-safety-of-random-number-generators zeroToOne engine using libdispatch. c thread safety c 11 openmp grand central dispatch share improve this question The C..
http://stackoverflow.com/questions/10939158/openmp-performance far I installed GNU GCC 4.7 via Macports and compiled with openMP on my Macbook for the first time Apple's GCC 4.2.1 throws up..
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 threading to fill in the container. The naive code using openMP in this example for simplicity which excludes clang for the..
http://stackoverflow.com/questions/2396430/how-to-use-lock-in-openmp to use lock in openMP I have two piece of C code running on 2 different cores. Both.. cores. Both of them wirte to the same file. How to use openMP and make sure there is no crash c locking openmp critical section.. functions https computing.llnl.gov tutorials openMP #OMP_SET_LOCK . Basically omp_lock_t writelock OMP_INIT_LOCK..
OpenMP: conditional use of #pragma http://stackoverflow.com/questions/7413331/openmp-conditional-use-of-pragma using the normal way was better. In fact I'd like to use openMP only if a condition is satisfied my code is #pragma omp parallel..
http://stackoverflow.com/questions/8325566/openmp-and-cpu-affinity www.spec.org omp2001 results omp2001.html page to find openMP implementation and the will search for specific environment..
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