https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065491#M4562 <P>The simple code below fails when run (with mpiexec.exe) on a 64-bit Win. 7 workstation (with dual 6-core processors). The culprit is the WRITE(*,*) command (when a large number of such commands are issued, as in the example below). Writing to a file works well.</P> <PRE class="brush:fortran;">PROGRAM MAIN USE MPI IMPLICIT NONE INTEGER :: RANK,ERROR,I COMPLEX(KIND=8) :: A(8000) CALL MPI_INIT(ERROR) CALL MPI_COMM_RANK(MPI_COMM_WORLD,RANK,ERROR) IF (RANK==0) THEN DO I=1,8000 WRITE(*,*) I,A(I) END DO END IF CALL MPI_FINALIZE(ERROR) END PROGRAM MAIN</PRE> <P>The errors look like this:</P> <PRE class="brush:plain;">[mpiexec@xxx] ..\hydra\ui\utils\uiu.c (406): assert (!closed) failed [mpiexec@xxx] ..\hydra\pm\pmiserv\pmiserv_cb.c (973): error in the UI defined callback [mpiexec@xxx] ..\hydra\tools\demux\demux_select.c (103): callback returned error status [mpiexec@xxx] ..\hydra\pm\pmiserv\pmiserv_pmci.c (501): error waiting for event [mpiexec@xxx] ..\hydra\ui\mpich\mpiexec.c (1110): process manager error waiting for completion</PRE> <P>This fails with 16 Update 3 as well as the 17 Beta. A smaller array will not lead to this error.</P> Tue, 17 May 2016 21:58:25 GMT OP1 2016-05-17T21:58:25Z https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065491#M4562 <P>The simple code below fails when run (with mpiexec.exe) on a 64-bit Win. 7 workstation (with dual 6-core processors). The culprit is the WRITE(*,*) command (when a large number of such commands are issued, as in the example below). Writing to a file works well.</P> <PRE class="brush:fortran;">PROGRAM MAIN USE MPI IMPLICIT NONE INTEGER :: RANK,ERROR,I COMPLEX(KIND=8) :: A(8000) CALL MPI_INIT(ERROR) CALL MPI_COMM_RANK(MPI_COMM_WORLD,RANK,ERROR) IF (RANK==0) THEN DO I=1,8000 WRITE(*,*) I,A(I) END DO END IF CALL MPI_FINALIZE(ERROR) END PROGRAM MAIN</PRE> <P>The errors look like this:</P> <PRE class="brush:plain;">[mpiexec@xxx] ..\hydra\ui\utils\uiu.c (406): assert (!closed) failed [mpiexec@xxx] ..\hydra\pm\pmiserv\pmiserv_cb.c (973): error in the UI defined callback [mpiexec@xxx] ..\hydra\tools\demux\demux_select.c (103): callback returned error status [mpiexec@xxx] ..\hydra\pm\pmiserv\pmiserv_pmci.c (501): error waiting for event [mpiexec@xxx] ..\hydra\ui\mpich\mpiexec.c (1110): process manager error waiting for completion</PRE> <P>This fails with 16 Update 3 as well as the 17 Beta. A smaller array will not lead to this error.</P> Tue, 17 May 2016 21:58:25 GMT https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065491#M4562 OP1 2016-05-17T21:58:25Z https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065492#M4563 <P>This doesn't sound like a Fortran issue, as I don't see any Fortran errors in the log. Whose MPI are you using? If it is trying to merge the standard output streams, it may be overwhelmed by the volume.</P> Wed, 18 May 2016 00:46:20 GMT https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065492#M4563 Steven_L_Intel1 2016-05-18T00:46:20Z https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065493#M4564 <P>Steve - I am using Intel MPI (shipped with the cluster edition of Intel Parallel Studio).</P> Wed, 18 May 2016 12:58:00 GMT https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065493#M4564 OP1 2016-05-18T12:58:00Z https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065494#M4565 <P>Ok. I am going to move this to the Clustering Technologies forum where MPI experts can respond. I don't see any evidence that it is a Fortran problem.</P> Wed, 18 May 2016 13:43:36 GMT https://community.intel.com/t5/Intel-MPI-Library/Bug-with-WRITE-and-MPI-process/m-p/1065494#M4565 Steven_L_Intel1 2016-05-18T13:43:36Z