I guess the question is whether a java "long" is equivalent to a C "long",
"long long", or "long int"...
Do you know? (I'm not much of a Java guy)
On Feb 19, 2013, at 7:22 PM, Steve Angelovich <sangelov...@lgc.com> wrote:
> 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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Jeff Squyres
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