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C
C Demonstrates use of shared and non-shared streams
C Each process has two streams. One stream is common to all the
C processes. The other stream is different on each processor.
C
C Uncomment the following line to get the interface with pointer checking
C #define CHECK_POINTERS
program twostreamsf_mpi
implicit none
#include <mpif.h>
#include "sprng_f.h"
integer streamnum,commNum, nstreams, seed
SPRNG_POINTER stream, commonStream
real*8 rn
integer i
integer myid, nprocs, ierror
integer 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 !This stream is different on each proces
commNum = nprocs !This stream is common to all processes
nstreams = nprocs +1 !extra stream is common to all processes
seed = 985456376
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 This stream is different on each process
stream = init_sprng(gtype,streamnum,nstreams,seed,SPRNG_DEFAULT)
write(6, 44) myid
44 format("Process", i2, ": Print information about new stream")
junk = print_sprng(stream)
C This stream is identical on each process
commonStream = init_sprng(gtype,commNum,nstreams,
& seed,SPRNG_DEFAULT)
write (6, 55) myid
55 format ("Process", i2,
& ": This stream is identical on all processes")
junk = print_sprng(commonStream)
do 100 i = 1, 2
rn = sprng(stream)
write(6, 66) myid, i, rn
100 continue
do 200 i = 1, 2
rn = sprng(commonStream)
write(6, 77) myid, i, rn
200 continue
66 format("Process", i2,
& ", random number (distinct stream)",i2,": ", f8.6)
77 format("Process", i2, ", random number (shared stream)",
& i2,": ", f8.6)
junk = free_sprng(stream)
junk = free_sprng(commonStream)
call MPI_FINALIZE(ierror)
end
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