search for: omp_set_num_threads

...that package I want to use OpenMP, as in the following code example: // header file #include <omp.h> using namespace Rcpp ; RcppExport SEXP testOpenMP( SEXP nThreads ) ; // cpp file SEXP testOpenMP( SEXP nThreads ) { BEGIN_RCPP NumericVector numberThreads = NumericVector( nThreads ); omp_set_num_threads( numberThreads(0) ); #pragma omp parallel { // Code inside this region runs in parallel. printf("Hello!\n"); } END_RCPP } As I am an absolute newbie with writing C++ extensions and have not much understanding of the Makevars file, I am unsure what to write into it. Curre...

...ame="hello_") use, intrinsic :: iso_c_binding, only : c_double, c_int integer(c_int), intent(in) :: ncores integer :: iam ! Specify number of threads to use: !$call omp_set_num_threads(ncores) !$omp parallel private(iam) iam=omp_get_thread_num() !$omp critical write(*,*) 'Hello from', iam !$omp end critical !$omp end parallel end subroutine hello end module hello_openmp *and this is my R function:* #'@export #'@useDynLib helloOpenMP, .registration...

...modified my R script as follows: #' OpenMP Hello World #' #' @param nthreads The number of threads that you want to use #' @example #' hello(nthreads=2) #' @export #' @useDynLib helloOpenMP, .registration = TRUE hello <- function(nthreads=4) { (OpenMPController::omp_set_num_threads(nthreads)) .Fortran("hello") return('Each thread will say hi to you!') } > hello(nthreads = 2) Hello from 0 Hello from 1 [1] "Each thread will say hi to you!" Alas, on Windows the same command just returns "Each thread will say hi to...

...rflow: https://stackoverflow.com/questions/58886111/r-why-is-matrix-product-slower-when-matrix-has-very-small-values Somebody could reproduce the behavior but I did not get any useful explanations yet. Many thanks for hints! Florian ## disable openMP library(RhpcBLASctl); blas_set_num_threads(1); omp_set_num_threads(1) A <- exp(-as.matrix(dist(expand.grid(1:60, 1:60)))) summary(c(A)) # Min. 1st Qu. Median Mean 3rd Qu. Max. # 0.000000 0.000000 0.000000 0.001738 0.000000 1.000000 B <- exp(-as.matrix(dist(expand.grid(1:60, 1:60)))*10) summary(c(B)) # Min. 1st Qu. Median Mean...

...m 0 Hello from 9 Hello from 8 Hello from 2 Hello from 6 Hello from 10 Hello from 11 Hello from 5 Hello from 7 Hello from 4 $ncores [1] 2 What am I missing? My Fortran subroutine uses !$call omp_set_num_threads(ncores) to set the number of threads. Why is this not working? How can I fix it? Thanks a lot for the help Ignacio On Fri, Feb 1, 2019 at 4:51 PM Ignacio Martinez <ignacio82 at gmail.com> wrote: > Hi everybody, > > I'm trying to develop an R package with Fortran and OpenMP....

...rtran 4.6, an error message appears. In other compilers the error does not occur. A small example. ## Code in Fortran        subroutine hello()        implicit none        integer :: nthreads, tid        integer :: omp_get_num_threads, omp_get_thread_num        integer :: omp_get_max_threads, omp_set_num_threads        print *, 'Máximo de threads', omp_get_max_threads()        !$omp parallel         tid = omp_get_thread_num()        print *, 'Hello World from thread = ', tid        print *, 'Number of threads =', omp_get_thread_num()        !$omp end parallel        end subroutine...

Can you send the IR you are using? Volkan On Thu, Oct 8, 2015 at 6:28 AM Erdem Derebaşoğlu < erdemderebasoglu at hotmail.com> wrote: > Thanks. I enabled my pass. I have one resolved issue though: > MachineMemOperand::getAddrSpace() always returns zero. How can I use it to > distinguish private memory accesses? > > Erdem > > ------------------------------ > From:

Hi everybody! Could somebody help me with the following? I'm trying to run a simple Hello World code in openmp using .C function. The C code i have is: #include <omp.h> #include <stdio.h> #include <R.h> void hello_omp(int *n) { int th_id, nthreads; omp_set_num_threads(*n); #pragma omp parallel private(th_id) { th_id = omp_get_thread_num(); Rprintf("Hello World from thread %d\n", th_id); #pragma omp barrier if ( th_id == 0 ) { nthreads = omp_get_num_threads(); Rprintf("There are %d threads\n",nthreads);...

Please pardon my ignorance, but doesn't OpenBLAS still not always play nicely with multi-threaded OpenMP? (for example, don't race conditions sometimes crop up)? If so, it might be nice to have the ability to temporarily disable multi-threaded OpenMP (effectively: omp_set_num_threads(1)) for the duration of operations using OpenBLAS. Regards Ben > Julia using OpenBLAS is *very* reassuring. > > I agree that having it included as an options(...) feature should be OK. > > On Sun, Dec 17, 2017, 3:22 PM Juan Telleria <jtelleriar at gmail.com <https://stat.ethz...

...; wrote: >> >> Please pardon my ignorance, but doesn't OpenBLAS still not always play nicely with multi-threaded OpenMP? (for example, don't race conditions sometimes crop up)? If so, it might be nice to have the ability to temporarily disable multi-threaded OpenMP (effectively: omp_set_num_threads(1)) for the duration of operations using OpenBLAS. >> >> Regards >> Ben >> >>> Julia using OpenBLAS is *very* reassuring. >>> >>> I agree that having it included as an options(...) feature should be OK. >>> >>> On Sun, Dec 17, 201...

...of the standard is supported in full, including combined directives (like '# ... Read more...<http://blog.llvm.org/2015/05/openmp-support_22.html> In case of static compilation, I always get 1 thread. In case of jit, I get this error: LLVM ERROR: Program used external function 'omp_set_num_threads' which could not be resolved! However, my code works just fine with g++. Any help is appreciated. Regards, Marwa Yusuf Teaching Assistant - Computer Engineering Department Faculty of Engineering - Benha University E-JUST PhD Student Computer Science & Engineering Dept. -------------- ne...

...ions/58886111/r-why-is-matrix-product-slower-when-matrix-has-very-small-values > Somebody could reproduce the behavior but I did not get any useful > explanations yet. > > Many thanks for hints! > Florian > > ## disable openMP > library(RhpcBLASctl); blas_set_num_threads(1); omp_set_num_threads(1) > > A <- exp(-as.matrix(dist(expand.grid(1:60, 1:60)))) > summary(c(A)) > # Min. 1st Qu. Median Mean 3rd Qu. Max. > # 0.000000 0.000000 0.000000 0.001738 0.000000 1.000000 > > B <- exp(-as.matrix(dist(expand.grid(1:60, 1:60)))*10) > summary(c(B)) &gt...

...file omp_set_nested /usr/local/packages/SUNWspro-9/SUNWspro/lib/v8plus/libfsu .so __mt_get_thread_num_ /usr/local/packages/SUNWspro-9/SUNWspro/lib/v8plus/libfai 2.so __mt_MasterFunction_ /usr/local/packages/SUNWspro-9/SUNWspro/lib/v8plus/libfai .so omp_set_num_threads /usr/local/packages/SUNWspro-9/SUNWspro/lib/v8plus/libfsu .so __omp_in_parallel_ /usr/local/packages/SUNWspro-9/SUNWspro/lib/v8plus/libfai 2.so omp_set_dynamic /usr/local/packages/SUNWspro-9/SUNWspro/lib/v8plus/libfsu .so __omp_get_num_threads_...

...rtran 4.6, an error message appears. In other compilers the error does not occur. A small example. ## Code in Fortran        subroutine hello()        implicit none        integer :: nthreads, tid        integer :: omp_get_num_threads, omp_get_thread_num        integer :: omp_get_max_threads, omp_set_num_threads        print *, 'Máximo de threads', omp_get_max_threads()        !$omp parallel         tid = omp_get_thread_num()        print *, 'Hello World from thread = ', tid        print *, 'Number of threads =', omp_get_thread_num()        !$omp end parallel        end subroutine...

...;>> >>>> Please pardon my ignorance, but doesn't OpenBLAS still not always play nicely with multi-threaded OpenMP? (for example, don't race conditions sometimes crop up)? If so, it might be nice to have the ability to temporarily disable multi-threaded OpenMP (effectively: omp_set_num_threads(1)) for the duration of operations using OpenBLAS. >>>> >>>> Regards >>>> Ben >>>> >>>>> Julia using OpenBLAS is *very* reassuring. >>>>> >>>>> I agree that having it included as an options(...) feature sho...

....com> wrote: > > Please pardon my ignorance, but doesn't OpenBLAS still not always play nicely with multi-threaded OpenMP? (for example, don't race conditions sometimes crop up)? If so, it might be nice to have the ability to temporarily disable multi-threaded OpenMP (effectively: omp_set_num_threads(1)) for the duration of operations using OpenBLAS. > > Regards > Ben > >> Julia using OpenBLAS is *very* reassuring. >> >> I agree that having it included as an options(...) feature should be OK. >> >> On Sun, Dec 17, 2017, 3:22 PM Juan Telleria <jte...

...>>> >>> Please pardon my ignorance, but doesn't OpenBLAS still not always play nicely with multi-threaded OpenMP? (for example, don't race conditions sometimes crop up)? If so, it might be nice to have the ability to temporarily disable multi-threaded OpenMP (effectively: omp_set_num_threads(1)) for the duration of operations using OpenBLAS. >>> >>> Regards >>> Ben >>> >>>> Julia using OpenBLAS is *very* reassuring. >>>> >>>> I agree that having it included as an options(...) feature should be OK. >>>&g...

...;t OpenBLAS still not always play >>>> nicely with multi-threaded OpenMP? (for example, don't race conditions >>>> sometimes crop up)? If so, it might be nice to have the ability to >>>> temporarily disable multi-threaded OpenMP (effectively: >>>> omp_set_num_threads(1)) for the duration of operations using OpenBLAS. >>>> >>>> Regards >>>> Ben >>>> >>>> Julia using OpenBLAS is *very* reassuring. >>>>> >>>>> I agree that having it included as an options(...) feature should...

...> >>>>> Please pardon my ignorance, but doesn't OpenBLAS still not always play nicely with multi-threaded OpenMP? (for example, don't race conditions sometimes crop up)? If so, it might be nice to have the ability to temporarily disable multi-threaded OpenMP (effectively: omp_set_num_threads(1)) for the duration of operations using OpenBLAS. >>>>> >>>>> Regards >>>>> Ben >>>>> >>>>>> Julia using OpenBLAS is *very* reassuring. >>>>>> >>>>>> I agree that having it included...

...ded > OpenMP? (for example, don't race conditions > sometimes crop up)? If so, it might be nice to > have the ability to temporarily disable > multi-threaded OpenMP (effectively: > omp_set_num_threads(1)) for the duration of > operations using OpenBLAS. > > Regards > Ben > > Julia using OpenBLAS is *very* reassuring. > > I agree that having it included as an >...