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.
>>> _______________________________________________
>>> users mailing list
>>> us...@open-mpi.org
>>> http://www.open-mpi.org/mailman/listinfo.cgi/users
>> 
>> 
>> -- 
>> Jeff Squyres
>> jsquy...@cisco.com
>> For corporate legal information go to: 
>> http://www.cisco.com/web/about/doing_business/legal/cri/
>> 
>> 
>> _______________________________________________
>> users mailing list
>> us...@open-mpi.org
>> http://www.open-mpi.org/mailman/listinfo.cgi/users
> 
> Tim Stitt PhD (User Support Manager).
> Center for Research Computing | University of Notre Dame | 
> P.O. Box 539, Notre Dame, IN 46556 | Phone:  574-631-5287 | Email: 
> tst...@nd.edu 
> 
> _______________________________________________
> users mailing list
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