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C
C Demonstrates the use of make_seed with MPI
C'make_sprng_seed' is called to produce a new seed each time the program
C is run. The same seed is produced on each process.
C
C Uncomment the following line to get the interface with pointer checking
C #define CHECK_POINTERS
program seedf_mpi
implicit none
#define USE_MPI 1
#include <mpif.h>
#include "sprng_f.h"
integer streamnum, nstreams, seed, i
SPRNG_POINTER stream
real*8 rn
integer myid, nprocs, ierror, junk
C---
integer gtype
C---
call MPI_INIT(ierror)
call MPI_COMM_SIZE(MPI_COMM_WORLD, nprocs, ierror)
call MPI_COMM_RANK(MPI_COMM_WORLD, myid, ierror)
streamnum = myid
nstreams = nprocs
seed = make_sprng_seed() !produce a new seed each time program is run
C--- node 0 is reading in a generator type
if (myid .eq. 0) then
#include "genf_types_menu.h"
print *,'Type in a generator type (integers: 0,1,2,3,4,5): '
read *, gtype
endif
call MPI_BCAST(gtype,1, MPI_INTEGER,0,MPI_COMM_WORLD,ierror)
C---
C Seed should be the same on all processes
write(6, 911) myid, seed
911 format("Process", i2, ": seed = ", i16)
stream = init_sprng(gtype,streamnum,nstreams,seed,SPRNG_DEFAULT)
write(6, 922) myid
922 format("Process", i2,
& ": Print information about stream:")
junk = print_sprng(stream)
do 100 i = 1, 3
rn = sprng(stream)
write(6, 933) myid, i, rn
100 continue
933 format("process", i2, ", random number", i2, ": ", f8.6)
junk = free_sprng(stream)
call MPI_FINALIZE(ierror)
end
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