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Subject: [OMPI devel] mpi/java question
From: Steve Angelovich (SAngelovich_at_[hidden])
Date: 2013-02-19 19:22:35


All,

We ran into a problem using openmpi from java with a Java data type of long when doing bcast and reduce operations.

*** An error occurred in MPI_Allreduce: the reduction operation MPI_MIN is not defined on the MPI_LONG_INT datatype
*** reported by process [211105480705,0]
*** on communicator MPI COMMUNICATOR 4 DUP FROM 0
*** MPI_ERR_OP: invalid reduce operation
*** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
*** and potentially your MPI job)
3 more processes have sent help message help-mpi-errors.txt / mpi_errors_are_fatal
Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages

Looking at ompi/mpi/java/c/mpi_Datatype.c it looks like an MPI_LONG_INT type is being used. It seems this should be an MPI_LONG_LONG. If I change this data type I'm able to do bcast and reduce operations via the java interface. Does this look like a bug or am I missing something else?

--- openmpi-1.7rc6/ompi/mpi/java/c/mpi_Datatype.c 2013-02-19 15:44:13.299046000 -0600
+++ openmpi-1.9a1r28069/ompi/mpi/java/c/mpi_Datatype.c 2013-02-17 20:00:14.000000000 -0600
@@ -60,7 +60,7 @@

MPI_Datatype Dts[] = { MPI_DATATYPE_NULL, MPI_BYTE, MPI_SHORT,
                         MPI_SHORT, MPI_BYTE, MPI_INT,
- MPI_LONG_LONG, MPI_FLOAT, MPI_DOUBLE,
+ MPI_LONG_INT, MPI_FLOAT, MPI_DOUBLE,
                         MPI_PACKED, MPI_LB, MPI_UB,
                         MPI_BYTE };

Thanks,
Steve

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