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c++ Programming Glossary: num_threads

Why openmp program only runs in one thread

http://stackoverflow.com/questions/10203902/why-openmp-program-only-runs-in-one-thread

Num of CPU d n omp_get_num_procs #pragma omp parallel for num_threads 4 for int i 0 i 100 i test I compiled with g fopenmp . It can.. omp parallel for num_thread 4 The correct clause is num_threads 4 not num_thread 4 . Incorrect openmp pragmas are ignored and..

race-condition in pthread_once()?

http://stackoverflow.com/questions/10843304/race-condition-in-pthread-once

main int argc char argv if argc 2 std cerr usage argv 0 num_threads std endl return 1 int num_threads atoi argv 1 std list foo threads.. 2 std cerr usage argv 0 num_threads std endl return 1 int num_threads atoi argv 1 std list foo threads std atomic int count 0 count.. thread std cout creating threads std endl for int i 0 i num_threads i threads.push_back new foo count std cout stopping threads..

OpenMP: for schedule

http://stackoverflow.com/questions/10850155/openmp-for-schedule

malloc 8 4096 #pragma omp parallel for schedule static 1 num_threads 8 for int i 0 i 8 i memset a i 4096 0 4096 4096 bytes in this.. loop like this #pragma omp parallel for schedule static 1 num_threads 8 for i 0 i 8 i memset a i 4096 1 4096 Each thread will access.. #include omp.h int main void int i #pragma omp parallel num_threads 8 #pragma omp for schedule dynamic 1 for i 0 i 8 i printf 1..

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 using OpenMP.. control the number of threads in the program using omp_set_num_threads but it does not work. #include iostream #include omp.h #include.. myrank MPI_Comm_size MPI_COMM_WORLD groupsize omp_set_num_threads 4 sum 0 #pragma omp for reduction sum for int i 0 i n i sum..

Does multithreading emphasize memory fragmentation?

http://stackoverflow.com/questions/5875989/does-multithreading-emphasize-memory-fragmentation

MAX_CHUNK_SIZE use up to x MB chunks #pragma omp parallel num_threads NUM_THREADS #pragma omp for for int i 0 i NUM_ITERS i uint64_t..

Are pointers private in OpenMP parallel sections?

http://stackoverflow.com/questions/7735332/are-pointers-private-in-openmp-parallel-sections

ptr new int size_per_thread threads #pragma omp parallel num_threads threads int id omp_get_thread_num int my_ptr ptr size_per_thread..

how to achieve 4 FLOPs per cycle

http://stackoverflow.com/questions/8389648/how-to-achieve-4-flops-per-cycle

double double start omp_get_wtime #pragma omp parallel num_threads tds double ret test_dp_mac_SSE 1.1 2.1 iterations sum omp_get_thread_num.. double double start omp_get_wtime #pragma omp parallel num_threads tds double ret test_dp_mac_AVX 1.1 2.1 iterations sum omp_get_thread_num..

How do I parallelize a for loop through a C++ std::list using OpenMP?

http://stackoverflow.com/questions/8691459/how-do-i-parallelize-a-for-loop-through-a-c-stdlist-using-openmp

like this #pragma omp parallel int thread_count omp_get_num_threads int thread_num omp_get_thread_num size_t chunk_size list.size.. section. So you'd probably have to manually set the num_threads or use omp_get_max_threads and handle the case that the number..

A very simple thread pool using pthreads in C++

http://stackoverflow.com/questions/3561095/a-very-simple-thread-pool-using-pthreads-in-c

to use and 2 tasks to accomplish. n exit 1 unsigned long NUM_THREADS atoi argv 1 unsigned long comp_TODO atoi argv 2 std cout Program.. long comp_TODO atoi argv 2 std cout Program will have NUM_THREADS threads working on comp_TODO things n for unsigned long i 0.. the various threads we'll create for unsigned long i 0 i NUM_THREADS i start the threads pthread_t tId new pthread_t threadIdList.push_back..

Does multithreading emphasize memory fragmentation?

http://stackoverflow.com/questions/5875989/does-multithreading-emphasize-memory-fragmentation

int NUM_ALLOCATIONS 5000 alloc's per thread const int NUM_THREADS 4 how many threads const int NUM_ITERS NUM_THREADS how many.. int NUM_THREADS 4 how many threads const int NUM_ITERS NUM_THREADS how many overall repetions const bool USE_NEW true use new or.. use up to x MB chunks #pragma omp parallel num_threads NUM_THREADS #pragma omp for for int i 0 i NUM_ITERS i uint64_t long totalAllocBytes..