George is correct.  Try this:

[5:21] svbu-mpi:~/mpi % cat tag-ub.f90
program mpitag
     use mpi
     implicit none
     integer :: err
     integer (KIND=MPI_ADDRESS_KIND) :: my_tag_ub
     logical flag

     call MPI_INIT(err)
     call MPI_COMM_GET_ATTR(MPI_COMM_WORLD, MPI_TAG_UB, my_tag_ub, flag, err)
     if (flag .eq. .true.) then
        print *, "Got tag ub:", my_tag_ub
     else
        print *, "Couldn't find tag ub!"
     endif
     call MPI_FINALIZE(err)
end program mpitag
[5:21] svbu-mpi:~/mpi % mpif90 tag-ub.f90
[5:22] svbu-mpi:~/mpi % ./a.out
Got tag ub:            2147483647
[5:22] svbu-mpi:~/mpi %



On Mar 13, 2012, at 7:50 PM, George Bosilca wrote:

MPI_TAG_UB is not a constant, it is a predefined attribute. As such it should be accessed using the attribute accessors (MPI_COMM_GET_ATTR page 229 in the MPI 2.2 standard).

 george.

On Mar 13, 2012, at 13:51 , Timothy Stitt wrote:

Hi Jeff,

I went through the procedure of compiling and running, then copied the procedure verbatim from the command line (see below).

********

[tstitt@memtfe] /pscratch/tstitt > more mpitag.f90

program mpitag

 use mpi

 implicit none

 integer :: err

 call MPI_INIT(err)

 print *,MPI_TAG_UB

 call MPI_FINALIZE(err)

end program mpitag

[tstitt@memtfe] /pscratch/tstitt > mpif90 --version

ifort (IFORT) 12.0.2 20110112

Copyright (C) 1985-2011 Intel Corporation.  All rights reserved.

[tstitt@memtfe] /pscratch/tstitt > mpiexec --version

mpiexec (OpenRTE) 1.4.3

Report bugs to http://www.open-mpi.org/community/help/

[tstitt@memtfe] /pscratch/tstitt > mpif90 -o mpitag mpitag.f90

[tstitt@memtfe] /pscratch/tstitt > mpiexec -n 2 ./mpitag

          0

          0

**********

Let me know if you need any further information.

Thanks,

Tim.

On Mar 13, 2012, at 1:39 PM, Jeffrey Squyres wrote:

Tim --

I am unable to replicate this problem with a 1.4 build with icc.

Can you share your test code?

On Mar 10, 2012, at 7:30 PM, Timothy Stitt wrote:

Hi all,

I was experimenting with MPI_TAG_UB in my code recently and found that its value is set to 0 in my v1.4.3 and v1.4.5 builds (these are the only builds I have available to test).

Oddly it only happens with my builds compiled with the Intel compiler. The PGI builds do produce a non-zero value. Has anyone else experienced this?

Regards,

Tim.

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P.O. Box 539, Notre Dame, IN 46556 | Phone:  574-631-5287 | Email: tstitt@nd.edu

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jsquyres@cisco.com
For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/


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