#include <omp.h>
#include <stdio.h>
//sudo apt-get install libomp-dev
// compilation:gcc -fopenmp hello.c -o hello
// execution :OMP_NUM_THREADS=8 ./hello
//omp_set_num_threads(4)
//double start=omp_get_wtime(); double end=omp_get_wtime();
//printf("the execution time= %lf",end-strat);
// speedup= TS/TP;// efficacity= speedup/np;
int main(int argc, char * argv [])
{
    
#pragma omp parallel num_threads(4)
    {
        int np = omp_get_num_threads(); //size
        int id = omp_get_thread_num(); // rank
        printf("Bonjour %d / %d\n",id, np);
        
        #pragma omp master
        printf("Hello worod %d",id);
        
        
    }
}