[mpich-discuss] Get universe size no longer supported?

[Jeff Hammond]

If you need MPI_UNIVERSE_SIZE to be defined, you can set it explicitly
via "mpiexec -usize MPI_UNIVERSE_SIZE".

There very well could be a bug in MPICH right now, but there is at
least a solution at hand and the MPI standard is not violated.

Jeff

On Mon, Feb 18, 2013 at 6:44 AM, Reuti <reuti at staff.uni-marburg.de> wrote:
> Am 18.02.2013 um 13:37 schrieb Jeff Hammond:
>
>> I've informed the appropriate people about the Trac issue.
>
> Thanks.
>
>
>> I recall that MPI stipulates only that MPI_UNIVERSE_SIZE exist; it
>> need not be defined.
>>
>> I think that MPICH might set MPI_UNIVERSE_SIZE in the process manager.
>> What PM are you using?
>
> I started with a plain `mpiexec -np 4 ./program`, hence it should use Hydra as it's a symbolic link to mpiexec.hydra.
>
> -- Reuti
>
>
>> Jeff
>>
>> On Mon, Feb 18, 2013 at 5:52 AM, Reuti <Reuti at staff.uni-marburg.de> wrote:
>>> Hi,
>>>
>>> a call:
>>>
>>> error=MPI_Comm_get_attr(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, &universe_sizep, &flag);
>>>
>>> worked in MPICH2 1.4.1p1. But the "flag" returned unsupported in 1.5 and 3.0.2. Was this info removed from being retrieved?
>>>
>>> -- Reuti
>>>
>>> PS: I found http://trac.mpich.org/projects/mpich/ticket/1426 mentioning MPI_UNIVERSE_SIZE but it throws an error:
>>>
>>> TracError: The Trac Environment needs to be upgraded.
>>>
>>> Run "trac-admin /www/trac.mpich.org/projects/mpich upgrade"
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>>
>>
>>
>> --
>> Jeff Hammond
>> Argonne Leadership Computing Facility
>> University of Chicago Computation Institute
>> jhammond at alcf.anl.gov / (630) 252-5381
>> http://www.linkedin.com/in/jeffhammond
>> https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond
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>
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-- 
Jeff Hammond
Argonne Leadership Computing Facility
University of Chicago Computation Institute
jhammond at alcf.anl.gov / (630) 252-5381
http://www.linkedin.com/in/jeffhammond
https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond