Fortran OpenMP: creating threads only once -


i working in fortran. purpose parallelize openmp program of kind:

do t=1, t_fin  (sequential)    sequence of loops (not sequential) end

where cycle sequential (temporal). have tried create threads @ beginning of each sequential cycle iteration, makes code slower be. therefore, question if possible create threads once before starting cycle. practically:

!$omp parallel  !$omp sections !$omp critical t=1, t_fin     sequence of omp end !$omp end critical !$omp end parallel

i have tried in way, works if 1 thread. suppose depends on fact there external critical section includes omp do. however, execute internal omp do more 1 thread. there way obtain this?

if understand question correctly, want avoid creating threads in each iteration of outer loop. can achieved taking omp parallel directive outside loop, , leave other statements inside loop. see 2 parallelization schemes.

you either parallelize inner loops: 

!$omp parallel t=1, t_fin  (sequential)    !$omp    first loop    !$omp end     !$omp    second loop    !$omp end     !... end !$omp end parallel

or, use sections run loops in parallel (if independent of each other): 

!$omp parallel t=1, t_fin  (sequential)    !$omp sections     !$omp section     first loop    !$omp end section     !$omp section    second loop    !$omp end section     !...    !$omp end sections end !$omp end parallel

in both versions, threads created outside loop.


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