I’m not sure why this would be happening. These error outputs go through the
“show_help” functionality, and we specifically target it at stderr:
/* create an output stream for us */
OBJ_CONSTRUCT(&lds, opal_output_stream_t);
lds.lds_want_stderr = true;
orte_help_output = opal_output_open(&lds);
Jeff: is it possible the opal_output system is ignoring the request and pushing
it to stdout??
Ralph
> On Sep 5, 2018, at 4:11 AM, emre brookes <[email protected]> wrote:
>
> Thanks Gilles,
>
> My goal is to separate openmpi errors from the stdout of the MPI program
> itself so that errors can be identified externally (in particular in an
> external framework running MPI jobs from various developers).
>
> My not so "well written MPI program" was doing this:
> MPI_Finalize();
> exit( errorcode );
> Which I assume you are telling me was bad practice & will replace with
> MPI_Abort( MPI_COMM_WORLD, errorcode );
> MPI_Finalize();
> exit( errorcode );
> I was previously a bit put off of MPI_Abort due to the vagueness of the man
> page:
>> _Description_
>> This routine makes a "best attempt" to abort all tasks in the group of comm.
>> This function does not require that the invoking environment take any action
>> with the error code. However, a UNIX or POSIX environment should handle this
>> as a return errorcode from the main program or an abort (errorcode).
> & I didn't really have an MPI issue to "Abort", but had used this for a user
> input or parameter issue.
> Nevertheless, I accept your best practice recommendation.
>
> It was not only the originally reported message, other messages went to
> stdout.
> Initially used the Ubuntu 16 LTS "$ apt install openmpi-bin libopenmpi-dev"
> which got me version (1.10.2),
> but this morning compiled and tested 2.1.5, with the same behavior, e.g.:
>
> $ /src/ompi-2.1.5/bin/mpicxx test_using_mpi_abort.cpp
> $ /src/ompi-2.1.5/bin/mpirun -np 2 a.out > stdout
> [domain-name-embargoed:26078] 1 more process has sent help message
> help-mpi-api.txt / mpi-abort
> [domain-name-embargoed:26078] Set MCA parameter "orte_base_help_aggregate" to
> 0 to see all help / error messages
> $ cat stdout
> hello from 0
> hello from 1
> --------------------------------------------------------------------------
> MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
> with errorcode -1.
>
> NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
> You may or may not see output from other processes, depending on
> exactly when Open MPI kills them.
> --------------------------------------------------------------------------
> $
>
> Tested 3.1.2, where this has been *somewhat* fixed:
>
> $ /src/ompi-3.1.2/bin/mpicxx test_using_mpi_abort.cpp
> $ /src/ompi-3.1.2/bin/mpirun -np 2 a.out > stdout
> --------------------------------------------------------------------------
> MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
> with errorcode -1.
>
> NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
> You may or may not see output from other processes, depending on
> exactly when Open MPI kills them.
> --------------------------------------------------------------------------
> [domain-name-embargoed:19784] 1 more process has sent help message
> help-mpi-api.txt / mpi-abort
> [domain-name-embargoed:19784] Set MCA parameter "orte_base_help_aggregate" to
> 0 to see all help / error messages
> $ cat stdout
> hello from 1
> hello from 0
> $
>
> But the originally reported error still goes to stdout:
>
> $ /src/ompi-3.1.2/bin/mpicxx test_without_mpi_abort.cpp
> $ /src/ompi-3.1.2/bin/mpirun -np 2 a.out > stdout
> --------------------------------------------------------------------------
> 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: [[22380,1],0]
> Exit code: 255
> --------------------------------------------------------------------------
> $ cat stdout
> hello from 0
> hello from 1
> -------------------------------------------------------
> Primary job terminated normally, but 1 process returned
> a non-zero exit code. Per user-direction, the job has been aborted.
> -------------------------------------------------------
> $
>
> Summary:
> 1.10.2, 2.1.5 both send most openmpi generated messages to stdout.
> 3.1.2 sends at least one type of openmpi generated messages to stdout.
> I'll continue with my "wrapper" strategy for now, as it seems safest and
> most broadly deployable [e.g. on compute resources where I need to use admin
> installed versions of MPI],
> but it would be nice for openmpi to ensure all generated messages end up in
> stderr.
>
> -Emre
>
> Gilles Gouaillardet wrote:
>> Open MPI should likely write this message on stderr, I will have a look at
>> that.
>>
>>
>> That being said, and though I have no intention to dodge the question, this
>> case should not happen.
>>
>> A well written (MPI) program should either exit(0) or have main() return 0,
>> so this scenario
>>
>> (e.g. all MPI tasks call MPI_Finalize() and then at least one MPI task exit
>> with a non zero error code)
>>
>> should not happen.
>>
>>
>> If your program might fail, it should call MPI_Abort() with a non zero error
>> code *before* calling MPI_Finalize().
>>
>> note this error can occur if your main() subroutine does not return any
>> value (e.g. it returns an undefined value, that might be non zero)
>>
>>
>> Cheers,
>>
>>
>> Gilles
>>
>>
>> On 9/5/2018 6:08 AM, emre brookes wrote:
>>> Background:
>>> ---
>>> Running on ubuntu 16.04 with apt install openmpi-bin libopenmpi-dev
>>> $ mpirun --version
>>> mpirun (Open MPI) 1.10.2
>>>
>>> I did search thru the docs a bit (ok, maybe I missed something obvious, my
>>> apologies if so)
>>> ---
>>> Question:
>>>
>>> Is there some setting to turn off the extra messages generated by openmpi ?
>>>
>>> e.g.
>>> $ mpirun -np 2 my_job > my_job.stdout
>>> adds this message to my_job.stdout
>>> -------------------------------------------------------
>>> Primary job terminated normally, but 1 process returned
>>> a non-zero exit code.. Per user-direction, the job has been aborted.
>>> -------------------------------------------------------
>>> which strangely goes to stdout and not stderr.
>>> I would intuitively expect error or notice messages to go to stderr.
>>> Is there a way to redirect these messages to stderr or some specified file?
>>>
>>> I need to separate this from the collected stdout of the job processes
>>> themselves.
>>>
>>> Somewhat kludgy options that come to mind:
>>>
>>> 1. I can use --output-filename outfile, which does separate the "openmpi"
>>> messages,
>>> but this creates a file for each process and I'd rather keep them as
>>> produced in one file,
>>> but without any messages from openmpi, which I'd like to keep separately.
>>>
>>> 2. Or I could write a script to filter the output and separate. A bit risky
>>> as someone could conceivably put something that looks like a openmpi
>>> message pattern in the mpi executable output.
>>>
>>> 3. hack the source code of openmpi.
>>>
>>> Any suggestions as to a more elegant or standard way of dealing with this?
>>>
>>> TIA,
>>> Emre.
>>>
>
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