My program it is with MPI and OpenMP, and is a sample program take
much memory, I don't know the memory RAM consume for a mpi program and
I want to know if mpi consume a lot of memory when if used together
openmp or I doing something wrong, for take memory Ram of mi program I
used a file /proc/id_proc/stat, where id_proc if the id of my process.
This is my example program:
#include <stdio.h>
#include "mpi.h"
#include <omp.h>
#include <vector>
#include <algorithm>
int main(int argc, char** argv){
int my_rank; /* rank of process */
int p; /* number of processes */
MPI_Init_thread(&argc, &argv, MPI::THREAD_MULTIPLE,&argc);
/* find out process rank */
MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
/* find out number of processes */
MPI_Comm_size(MPI_COMM_WORLD, &p);
char cad[4];
MPI_Status status;
omp_set_num_threads(2);
#pragma omp parallel
{
int h = omp_get_thread_num();
if(h==0){
MPI_Send(&cad, 1, MPI::CHAR, my_rank,
11,MPI_COMM_WORLD);
}
else{
std::vector<bool> all(2,0);
MPI_Recv(&cad, 2, MPI::CHAR, MPI::ANY_SOURCE,
MPI::ANY_TAG,MPI_COMM_WORLD, &status);
}
}
/* shut down MPI */
MPI_Finalize();
return 0;
}
Compile:
mpic++ -fopenmp -fno-threadsafe-statics -o sample_program sample_program.c
Run
mpirun sample_program
and the memory consume: 190MB
Please I need help is very important to me get a low memory consume
