That worked perfectly. Thank you. I'm surprised that clang didn't emit a
warning about this!
-Devon
On Mon, May 9, 2016 at 3:42 PM, Gilles Gouaillardet <
gilles.gouaillar...@gmail.com> wrote:
> 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
>>
>
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