test_AllReduce_sum Subroutine

      subroutine test_AllReduce_sum

      !Test with Integer arguments
      !===========================
      !------------------------------------------------------------------------
      !EX_UTest
      write(failMsg, *) "Did not return ESMF_SUCCESS"
      write(name, *) "VM All Reduce ESMF_REDUCE_SUM Test"
      call ESMF_VMAllReduce(vm, sendData=array1, recvData=array3, count=nsize, &
                            reduceflag=ESMF_REDUCE_SUM, rc=rc)
      call ESMF_Test((rc.eq.ESMF_SUCCESS), name, failMsg, result, ESMF_SRCLINE)

      !------------------------------------------------------------------------
      !EX_UTest
      isum=0
      do j=1,npets
      end do
      do i=1,nsize
        array3_soln(i) = sum( array2(i,:) )
        print *, localPet,'array3(',i,')=',array3(i), &
                          'array3_soln(',i,')=',array3_soln(i)
        isum=isum + abs( array3(i) - array3_soln(i) )
      end do
      write(failMsg, *) "Returned wrong results"
      write(name, *) "Verify All Reduce ESMF_REDUCE_SUM Results Test"
      call ESMF_Test((isum.eq.0), name, failMsg, result, ESMF_SRCLINE)

      !------------------------------------------------------------------------
      ! Scalar version
      ! ==============
      ! EX_UTest
      write(failMsg, *) "Did not return ESMF_SUCCESS"
      write(name, *) "VM All Reduce scalar ESMF_REDUCE_SUM Test"
      i = npets
      j = -1
      call ESMF_VMAllReduce (vm, sendData=i, recvData=j,  &
                             reduceflag=ESMF_REDUCE_SUM, rc=rc)
      call ESMF_Test((rc.eq.ESMF_SUCCESS), name, failMsg, result, ESMF_SRCLINE)

      !------------------------------------------------------------------------
      !EX_UTest
      write(failMsg, *) "Returned wrong results"
      write(name, *) "Verify All Reduce scalar ESMF_REDUCE_SUM Results Test"
      call ESMF_Test(j == npets*npets, name, failMsg, result, ESMF_SRCLINE)


      !Test with ESMF_KIND_R8  arguments
      !=================================
      !------------------------------------------------------------------------
      !EX_UTest
      write(failMsg, *) "Did not return ESMF_SUCCESS"
      write(name, *) "VM All Reduce ESMF_REDUCE_SUM Test"
      call ESMF_VMAllReduce(vm, sendData=farray1, recvData=farray3, &
                            count=nsize, reduceflag=ESMF_REDUCE_SUM, rc=rc)
      call ESMF_Test((rc.eq.ESMF_SUCCESS), name, failMsg, result, ESMF_SRCLINE)

      !------------------------------------------------------------------------
      !EX_UTest
      fsum=0.0
      do i=1,nsize
        farray3_soln(i) = sum( farray2(i,:) )
        print *, localPet,'farray3(',i,')=',farray3(i), &
                          'farray3_soln(',i,')=',farray3_soln(i)
        fsum=fsum + abs( farray3(i) - farray3_soln(i) )
      end do
      write(failMsg, *) "Returned wrong results"
      write(name, *) "Verify All Reduce ESMF_REDUCE_SUM Results Test"
      call ESMF_Test(.not. abs (fsum) > 0.0, name, failMsg, result, ESMF_SRCLINE)

      !Test with ESMF_KIND_R4  arguments
      !=================================
      !------------------------------------------------------------------------
      !EX_UTest
      write(failMsg, *) "Did not return ESMF_SUCCESS"
      write(name, *) "VM All Reduce ESMF_REDUCE_SUM Test"
      call ESMF_VMAllReduce(vm, sendData=f4array1, recvData=f4array3, &
                            count=nsize, reduceflag=ESMF_REDUCE_SUM, rc=rc)
      call ESMF_Test((rc.eq.ESMF_SUCCESS), name, failMsg, result, ESMF_SRCLINE)

      !------------------------------------------------------------------------
      !EX_UTest
      fsum4=0.0
      do i=1,nsize
        f4array3_soln(i) = sum( f4array2(i,:) )
        print *, localPet,'f4array3(',i,')=',f4array3(i), &
                          'f4array3_soln(',i,')=',f4array3_soln(i)
        fsum4=fsum4 + abs( f4array3(i) - f4array3_soln(i) )
      end do
      write(failMsg, *) "Returned wrong results"
      write(name, *) "Verify All Reduce ESMF_REDUCE_SUM Results Test"
      call ESMF_Test(.not. abs (fsum4) > 0.0, name, failMsg, result, ESMF_SRCLINE)

      end subroutine test_AllReduce_sum