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/***************************************************************************/
/* ____Demonstrates the use of make_seed with MPI____ */
/* 'make_sprng_seed' is called to produce a new seed each time the program */
/* is run. The same seed is produced on each process. */
/***************************************************************************/
#include <stdio.h>
#include <mpi.h> /* MPI header file */
/* Uncomment the following line to get the interface with pointer checking */
/*#define CHECK_POINTERS */
#define USE_MPI /* SPRNG makes MPI calls */
#include "sprng.h" /* SPRNG header file */
main(int argc, char *argv[])
{
int streamnum, nstreams, seed, *stream, i, myid, nprocs;
double rn;
int gtype; /*--- */
/*************************** MPI calls ***********************************/
MPI_Init(&argc, &argv); /* Initialize MPI */
MPI_Comm_rank(MPI_COMM_WORLD, &myid); /* find process id */
MPI_Comm_size(MPI_COMM_WORLD, &nprocs); /* find number of processes */
/************************** Initialization *******************************/
streamnum = myid;
nstreams = nprocs; /* one stream per processor */
seed = make_sprng_seed(); /* make new seed each time program is run */
/*--- node 0 is reading in a generator type */
if(myid == 0)
{
#include "gen_types_menu.h"
printf("Type in a generator type (integers: 0,1,2,3,4,5): ");
scanf("%d", >ype);
}
MPI_Bcast(>ype,1,MPI_INT,0,MPI_COMM_WORLD );
/* Seed should be the same on all processes */
printf("Process %d: seed = %16d\n", myid, seed);
stream = init_sprng(gtype,streamnum,nstreams,seed,SPRNG_DEFAULT); /*initialize stream*/
printf("\n\nProcess %d: Print information about stream:\n",myid);
print_sprng(stream);
/************************ print random numbers ***************************/
for (i=0;i<3;i++)
{
rn = sprng(stream); /* generate double precision random number */
printf("process %d, random number %d: %f\n", myid, i+1, rn);
}
free_sprng(stream); /* free memory used to store stream state */
MPI_Finalize(); /* Terminate MPI */
}
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