Volker, i was unable to reproduce this issue on linux
can you please post your full configure command line, your gnu compiler version and the full test program ? also, how many mpi tasks are you running ? Cheers, Gilles On Wed, Jul 26, 2017 at 4:25 PM, Volker Blum <volker.b...@duke.edu> wrote: > Hi, > > I tried openmpi-3.0.0rc1.tar.gz using Intel Fortran 2017 and gcc on a current > MacOS system. For this version, it seems to me that MPI_IN_PLACE returns > incorrect results (while other MPI implementations, including some past > OpenMPI versions, work fine). > > This can be seen with a simple Fortran example code, shown below. In the > test, the values of all entries of an array “test_data” should be 1.0d0 if > the behavior were as intended. However, the version of OpenMPI I have returns > 0.d0 instead. > > I’ve seen this behavior on some other compute platforms too, in the past, so > it wasn’t new to me. Still, I thought that this time, I’d ask. Any thoughts? > > Thank you, > Best wishes > Volker > > ! size of test data array > integer :: n_data > > ! array that contains test data for MPI_IN_PLACE > real*8, allocatable :: test_data(:) > > integer :: mpierr > > n_data = 10 > > allocate(test_data(n_data),stat=mpierr) > > ! seed test data array for allreduce call below > if (myid.eq.0) then > test_data(:) = 1.d0 > else > test_data(:) = 0.d0 > end if > > ! Sum the test_data array over all MPI tasks > call MPI_ALLREDUCE(MPI_IN_PLACE, & > test_data(:), & > n_data, & > MPI_DOUBLE_PRECISION, & > MPI_SUM, & > mpi_comm_global, & > mpierr ) > > ! The value of all entries of test_data should now be 1.d0 on all MPI > tasks. > ! If that is not the case, then the MPI_IN_PLACE flag may be broken. > > > > > > > Volker Blum > Associate Professor > Ab Initio Materials Simulations > Duke University, MEMS Department > 144 Hudson Hall, Box 90300, Duke University, Durham, NC 27708, USA > > volker.b...@duke.edu > https://aims.pratt.duke.edu > +1 (919) 660 5279 > Twitter: Aimsduke > > Office: 1111 Hudson Hall > > > > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/users _______________________________________________ users mailing list users@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/users
