But does the standard say you need to have autoconf available to use MPI? This is a good solution but has issues. Ricky A. Kendall Group Leader, Scientific Computing Oak Ridge Leadership Computing Facility (OLCF) Oak Ridge National Laboratory Phone: (865) 576-6905 Cell: (865) 356-3461 Email: kendallra _at_ ornl.gov AIM and Yahoo: rickyakendall Gmail: rickyk -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of William Gropp Sent: Wednesday, January 20, 2010 11:18 AM To: Main MPI Forum mailing list Cc: Markus Geimer Subject: Re: [Mpi-forum] Compile-time check for MPI_Init or MPI_Init thread In this exact situation (building tests for any MPI implementation, including tests of thread safety, I use the autoconf macros to check for the functions that I need. Bill On Jan 20, 2010, at 3:15 AM, Marc-Andre Hermanns wrote:

Hi all,

we are currently puzzled about how to check whether to call MPI_Init or MPI_Init_thread in one of our programs.

Our performance analyzer scout can be built in different versions: MPI, OpenMP, and hybrid MPI/OpenMP. As the code-base is shared, we have #define statements to separate individual portions of the code. To decide whether to call MPI_Init or MPI_Init_thread at compile time we check the #define set by MPI. However, POE on our Power6 Cluster correctly reports MPI 1, as it does not support spawning and is therefore not MPI 2 compliant, yet MPI_Init_thread would be available, and must be used for the hybrid version.

My initial idea is to take 'nm' at configure-time of our tool. Check whether MPI_Init_thread is in the library, and set my own #define.

Is there a more elegant solution? How are users supposed to portably detect it?

Is it something we can/should fix?

Best regards, Marc-Andre -- Marc-Andre Hermanns Juelich Supercomputing Centre Institute for Advanced Simulation Forschungszentrum Juelich GmbH D-52425 Juelich Germany

Phone : +49-2461-61-2054 Fax : +49-2461-61-6656 eMail : [email protected] WWW : http://www.fz-juelich.de/jsc/

JSC is the coordinator of the John von Neumann Institute for Computing and member of the Gauss Centre for Supercomputing

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William Gropp Deputy Director for Research Institute for Advanced Computing Applications and Technologies Paul and Cynthia Saylor Professor of Computer Science University of Illinois Urbana-Champaign _______________________________________________ mpi-forum mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum