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! This file created from f77/pt2pt/isendf.f with f77tof90
!
! Copyright (C) by Argonne National Laboratory
! See COPYRIGHT in top-level directory
!
! This program is based on the allpair.f test from the MPICH-1 test
! (test/pt2pt/allpair.f), which in turn was inspired by a bug report from
! fsset@corelli.lerc.nasa.gov (Scott Townsend)
program isend
use mpi
integer ierr, errs, comm
logical mtestGetIntraComm
logical verbose
common /flags/ verbose
errs = 0
verbose = .false.
! verbose = .true.
call MTest_Init( ierr )
do while ( mtestGetIntraComm( comm, 2, .false. ) )
call test_pair_isend( comm, errs )
call mtestFreeComm( comm )
enddo
!
call MTest_Finalize( errs )
!
end
!
subroutine test_pair_isend( comm, errs )
use mpi
integer comm, errs
integer rank, size, ierr, next, prev, tag, count
integer TEST_SIZE
parameter (TEST_SIZE=2000)
integer status(MPI_STATUS_SIZE), requests(2)
integer statuses(MPI_STATUS_SIZE,2)
real send_buf(TEST_SIZE), recv_buf(TEST_SIZE)
logical verbose
common /flags/ verbose
!
if (verbose) then
print *, ' isend and irecv'
endif
!
!
call mpi_comm_rank( comm, rank, ierr )
call mpi_comm_size( comm, size, ierr )
next = rank + 1
if (next .ge. size) next = 0
!
prev = rank - 1
if (prev .lt. 0) prev = size - 1
!
tag = 2123
count = TEST_SIZE / 5
!
call clear_test_data(recv_buf,TEST_SIZE)
!
if (rank .eq. 0) then
!
call MPI_Irecv(recv_buf, TEST_SIZE, MPI_REAL, &
& MPI_ANY_SOURCE, MPI_ANY_TAG, comm, &
& requests(1), ierr)
!
call init_test_data(send_buf,TEST_SIZE)
!
call MPI_Isend(send_buf, count, MPI_REAL, next, tag, &
& comm, requests(2), ierr)
!
call MPI_Waitall(2, requests, statuses, ierr)
!
call rq_check( requests, 2, 'isend and irecv' )
!
call msg_check( recv_buf, next, tag, count, statuses(1,1), &
& TEST_SIZE, 'isend and irecv', errs )
!
else if (prev .eq. 0) then
!
call MPI_Recv(recv_buf, TEST_SIZE, MPI_REAL, &
& MPI_ANY_SOURCE, MPI_ANY_TAG, comm, &
& status, ierr)
!
call msg_check( recv_buf, prev, tag, count, status, TEST_SIZE, &
& 'isend and irecv', errs )
!
call MPI_Isend(recv_buf, count, MPI_REAL, prev, tag, &
& comm, requests(1), ierr)
!
call MPI_Wait(requests(1), status, ierr)
!
call rq_check( requests(1), 1, 'isend and irecv' )
!
end if
!
end
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