Called at the beginning of a SHMEM program to identify the number of processes desired.
#include <shmem.h> void start_pes(int npes);
The start_pes routine identifies the number of processes for a program. This statement must be the first statement in a program that uses IBM SHMEM communication routines.
The value of npes must be less than or equal to the value specified by MP_PROCS environment variable.
For current implementation, any npes value other than 0 is ignored. Users can only do the initialization once by invoking either shmem_init or start_pes in the beginning of their programs
#include <shmem.h>
#include <stdio.h>
int main (int argc, char* argv[])
{
int total_tasks = -1;
int my_task = -1;
start_pes(0);
total_tasks = _num_pes();
if (total_tasks <= 0) {
printf("FAILED\n");
return 0;
} else {
printf("number of pes is %d\n", total_tasks);
}
my_task = _my_pe();
if (my_task < 0){
printf("FAILED\n");
return 0;
} else {
printf("my pe id is %d\n", my_task);
}
printf("PASSED\n");
return 0;
}
Subroutines: num_pes, my_pe