RunPod•2w ago

omp.h unable to access all processors.

Hi! I'm running a pod with 8 vCPUs, but it seems like omp.h can only access 1 of them while thread can access all of them. For example,

c++
#include <omp.h>
#include <thread>
#include <iostream>
using namespace std;

int main(){
  cout << omp_get_max_threads() << endl;
  cout << thread::hardware_concurrency() << endl;
}

c++
#include <omp.h>
#include <thread>
#include <iostream>
using namespace std;

int main(){
  cout << omp_get_max_threads() << endl;
  cout << thread::hardware_concurrency() << endl;
}

will print out 1 9

8 Replies

nerdylive•2w ago

Set the Environment Variable: Before running your program, set OMP_NUM_THREADS to match the number of logical cores:

export OMP_NUM_THREADS=9

export OMP_NUM_THREADS=9

or try

    omp_set_num_threads(omp_get_num_procs()); // Set OpenMP

    omp_set_num_threads(omp_get_num_procs()); // Set OpenMP

||dank-memer||OP•2w ago

c++
omp_get_num_procs()

c++
omp_get_num_procs()

also returns 1 for me i was just wondering if the restriction on nproc could be somehow affecting omp

nerdylive•2w ago

try to open a ticket for asking this im not sure about the program you're using

||dank-memer||OP•2w ago

ok thanks!

Madiator2011 (Work)•2w ago

looks like cpu pod limitations

||dank-memer||OP•2w ago

is there a way to multithread with omp on a cpu pod then? I cant seem to utilize more than one core at a time

Madiator2011 (Work)•2w ago

I suspect might be not. I was able to get it work on gpu though

||dank-memer||OP•2w ago

ah thats unfortunate thanks tho

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omp.h unable to access all processors.

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