Devon,
send() is a libc function that is used internally by Open MPI, and it uses
your user function instead of the libc ne.
simply rename your function mysend() or something else that is not used by
libc, and your issue will likely be fixed
Cheers,
Gilles
On Tuesday, May 10, 2016, Devon Hollowood <devonhollow...@gmail.com> wrote:
> Hello,
>
> I am having trouble understanding why I am getting an error when running
> the program produced by the attached C file. In this file, there are three
> short functions: send(), bounce() and main(). send() and bounce() both use
> MPI_Send() and MPI_Recv(), but critically, neither one is called from
> main(), so as I understand it, neither function should ever be run. main()
> is just:
>
> int main(int argc, char *argv[]) {
>> int rank;
>>
>> MPI_Init(&argc, &argv);
>> MPI_Comm_rank(MPI_COMM_WORLD, &rank);
>>
>> MPI_Finalize();
>> }
>>
>
> Despite the fact that the program should never enter send() or bounce(),
> when I compile with
>
> mpicc mpi-issue.c -o mpi-issue
>>
>
> and run with
>
> mpirun -n 2 --verbose ./mpi-issue
>>
>
> I get the following:
>
> *** An error occurred in MPI_Send
>> *** on a NULL communicator
>> *** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
>> *** and potentially your MPI job)
>> [dhcp-visitor-enr-117-111.slac.stanford.edu:99119] Local abort before
>> MPI_INIT completed successfully; not able to aggregate error messages, and
>> not able to guarantee that all other processes were killed!
>> -------------------------------------------------------
>> Primary job terminated normally, but 1 process returned
>> a non-zero exit code.. Per user-direction, the job has been aborted.
>> -------------------------------------------------------
>> --------------------------------------------------------------------------
>> mpirun detected that one or more processes exited with non-zero status,
>> thus causing
>> the job to be terminated. The first process to do so was:
>>
>> Process name: [[2829,1],0]
>> Exit code: 1
>> --------------------------------------------------------------------------
>>
>>
>
> How is it possible to be getting an error in MPI_Send(), if MPI_Send()
> never gets run?
>
> I am running open-mpi 1.10.2, installed via the Homebrew open-mpi package,
> and this is running on my Macbook, which is running OSX Yosemite. I have
> attached the results of ompi_info --all as ompi_info.txt.bz2
>
> Any help would be appreciated! Sorry if this is a newb question and I am
> missing something obvious--I tried my best to search for this issue but I
> couldn't find anything.
>
> -Devon
>
