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/*****************************************************************************\
* test1.94.server.c - Test of MPICH2 task spawn logic
*****************************************************************************
* This file is part of Slurm, a resource management program.
* For details, see <https://slurm.schedmd.com/>.
* Please also read the included file: DISCLAIMER.
*
* Slurm is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* Slurm is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along
* with Slurm; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
\*****************************************************************************/
#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
int world_size, universe_size = 0, *universe_sizep, rank, flag, rc;
MPI_Comm everyone; /* intercommunicator */
if (argc < 2) {
printf("FAILURE: Usage %s <client_program>\n", argv[0]);
exit(1);
}
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &world_size);
if (world_size != 1) {
printf("FAILURE: Started %d server processes\n", world_size);
exit(1);
}
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
//printf("server rank:%d\n",rank);
/* NOTE: Ideally MPI_UNIVERSE_SIZE would be the size of the job
* allocation. Presently it is the size of the job step allocation.
* In any case, additional tasks can be spawned */
MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE,
&universe_sizep, &flag);
if (flag) {
universe_size = *universe_sizep;
//printf("MPI_UNIVERSE_SIZE is %d\n", universe_size);
}
if (universe_size < 2)
universe_size = 5;
rc = MPI_Comm_spawn(argv[1], MPI_ARGV_NULL, universe_size-1,
MPI_INFO_NULL, 0, MPI_COMM_SELF, &everyone,
MPI_ERRCODES_IGNORE);
if (rc != MPI_SUCCESS) {
printf("FAILURE: MPI_Comm_spawn(): %d\n", rc);
exit(1);
}
MPI_Finalize();
exit(0);
}
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