[mpich-discuss] MPI comm attributes not working?

[Balaji, Pavan]

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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