[mpich-discuss] MPI comm attributes not working?

[Balaji, Pavan]

Hmm.  I would think the mpich output is correct: the attributed should only be deleted once.  But I could be wrong.

 -- Pavan

> On Apr 5, 2016, at 8:10 AM, Jeff Hammond <jeff.science at gmail.com> wrote:
> 
> My concern is the number of times the string "ibcast_delete" appears in the output (2 vs 1)...
> 
> Jeff
> 
> On Mon, Apr 4, 2016 at 10:02 PM, Balaji, Pavan <balaji at anl.gov> wrote:
> 
> You are printing a number that's generated by the MPI implementation.  It's value will be different for different MPI implementations.
> 
>  -- Pavan
> 
>> On Apr 4, 2016, at 11:56 PM, Jeff Hammond <jeff.science at gmail.com> wrote:
>> 
>> I am trying to understand how communicator attributes work, so I found http://stackoverflow.com/questions/25198353/callbacks-provided-in-mpi-comm-create-keyval-are-not-called, which contains a nice example (the code in http://stackoverflow.com/a/25205611/2189128).
>> 
>> However, the posted output of this code is:
>> 
>> $ mpirun -np 1 ./comm-attr
>> In ibcast_copy: keyval = 10
>> In ibcast_delete: keyval = 10
>> In ibcast_delete: keyval = 10
>> 
>> Whereas I observe:
>> 
>> $ mpirun -np 1 ./a.out
>> In ibcast_copy: keyval = -1539309568
>> In ibcast_delete: keyval = -1539309568
>> 
>> Can anyone help me understand what the correct output of this program is?  If it is not what I am seeing, is this a bug in MPICH or am I doing something wrong?
>> 
>> I am using MPICH git from November 2015, so I will git pull && ./autogen.sh && $CONFIGUREMAKEINSTALL and try again just to be sure.
>> 
>> Thanks,
>> 
>> Jeff
>> 
>> $ mpirun --version
>> HYDRA build details:
>>    Version:                                 3.2
>>    Release Date:                            unreleased development copy
>>    CC:                              icc
>>    CXX:                             icpc
>>    F77:                             ifort
>>    F90:                             ifort
>>    Configure options:                       '--disable-option-checking' '--prefix=/opt/mpich/dev/intel/default' 'CC=icc' 'CXX=icpc' 'FC=ifort' 'F77=ifort' '--enable-cxx' '--enable-fortran' '--enable-threads=runtime' '--enable-g=dbg' '--with-pm=hydra' '--enable-wrapper-rpath' '--enable-static' '--enable-shared' '--cache-file=/dev/null' '--srcdir=../../../../src/pm/hydra' 'CFLAGS= -g -O2' 'LDFLAGS=' 'LIBS=-lpthread ' 'CPPFLAGS= -I/Users/jrhammon/Work/MPI/MPICH/git/build/src/mpl/include -I/Users/jrhammon/Work/MPI/MPICH/git/src/mpl/include -I/Users/jrhammon/Work/MPI/MPICH/git/src/openpa/src -I/Users/jrhammon/Work/MPI/MPICH/git/build/src/openpa/src -D_REENTRANT -I/Users/jrhammon/Work/MPI/MPICH/git/build/src/mpi/romio/include'
>>    Process Manager:                         pmi
>>    Launchers available:                     ssh rsh fork slurm ll lsf sge manual persist
>>    Topology libraries available:            hwloc
>>    Resource management kernels available:   user slurm ll lsf sge pbs cobalt
>>    Checkpointing libraries available:
>>    Demux engines available:                 poll select
>> 
>> 
>> --
>> Jeff Hammond
>> jeff.science at gmail.com
>> http://jeffhammond.github.io/
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> 
> -- 
> Jeff Hammond
> jeff.science at gmail.com
> http://jeffhammond.github.io/
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