openmpi

Alex Margolin ce97fc7674 OSHMEM: Fixed race condition problem in example code. The problem was with oshmem ring code, which cycles a constant amout of data through all the processes. When the program would expect the memory to change it did not explicitly warrent a recv() call, thus counting on the memory region to hold the new value when in fact it could be set before or after the check, causing slower BTLs to pass and faster ones to fail. The fix changes the logic to anticipate the next message rather then the current one, which would be a mistake. Patch applied to both C and fortran90 version of the example code. reviewd by miked cmr=v1.7.5:reviewer=ompi-rm1.7 This commit was SVN r30760.		2014-02-18 13:00:53 +00:00
..
dtrace	Updated README to use the OMPI_COMM_WORLD_RANK instead of the old vpid env-var.	2008-08-05 11:31:45 +00:00
connectivity_c.c	Add simple test that sends a message between all the ranks in the job.	2007-02-28 21:38:02 +00:00
hello_c.c	Add the new MPI-3 function MPI_GET_LIBRARY_VERSION.	2012-02-02 23:57:09 +00:00
hello_cxx.cc	Update C++ examples to say that Open MPI no longer builds the MPI C++	2013-01-28 22:22:26 +00:00
hello_mpifh.f	== Highlights ==	2012-04-18 15:57:29 +00:00
hello_oshmem_c.c	1. Default target (e.g. 'make all') now build all avaliable examples depends on configuration.	2013-11-12 13:02:07 +00:00
hello_oshmemfh.f90	Remove num_pes,my_pe declarations from shmem.fh.	2014-02-11 01:36:26 +00:00
hello_usempi.f90	== Highlights ==	2012-04-18 15:57:29 +00:00
hello_usempif08.f90	== Highlights ==	2012-04-18 15:57:29 +00:00
Hello.java	New examples for the updated MPI Java bindings	2013-09-26 22:48:02 +00:00
Makefile	Only check for the MPI / OSHMEM bindings if we can find ompi_info /	2014-01-09 17:48:55 +00:00
Makefile.include	1. Default target (e.g. 'make all') now build all avaliable examples depends on configuration.	2013-11-12 13:02:07 +00:00
README	1. Default target (e.g. 'make all') now build all avaliable examples depends on configuration.	2013-11-12 13:02:07 +00:00
ring_c.c	- Convert MPI_Init(NULL, NULL) to MPI_Init(&argc, &argv) because	2006-08-08 13:01:17 +00:00
ring_cxx.cc	Update C++ examples to say that Open MPI no longer builds the MPI C++	2013-01-28 22:22:26 +00:00
ring_mpifh.f	== Highlights ==	2012-04-18 15:57:29 +00:00
ring_oshmem_c.c	OSHMEM: Fixed race condition problem in example code.	2014-02-18 13:00:53 +00:00
ring_oshmemfh.f90	OSHMEM: Fixed race condition problem in example code.	2014-02-18 13:00:53 +00:00
ring_usempi.f90	== Highlights ==	2012-04-18 15:57:29 +00:00
ring_usempif08.f90	== Highlights ==	2012-04-18 15:57:29 +00:00
Ring.java	New examples for the updated MPI Java bindings	2013-09-26 22:48:02 +00:00

README

Copyright (c) 2004-2006 The Trustees of Indiana University and Indiana
                        University Research and Technology
                        Corporation.  All rights reserved.
Copyright (c) 2006-2012 Cisco Systems, Inc.  All rights reserved.
Copyright (c) 2007-2009 Sun Microsystems, Inc.  All rights reserved.
Copyright (c) 2010      Oracle and/or its affiliates.  All rights reserved.
Copyright (c) 2013      Mellanox Technologies, Inc.  All rights reserved.

$COPYRIGHT$

The files in this directory are sample MPI applications provided both
as a trivial primer to MPI as well as simple tests to ensure that your
Open MPI installation is working properly.

If you are looking for a comprehensive MPI tutorial, these samples are
not enough.  Excellent MPI tutorials are available here:

        http://www.citutor.org/login.php

Get a free account and login; you can then browse to the list of
available courses.  Look for the ones with "MPI" in the title.

There are two MPI examples in this directory, each using one of six
different MPI interfaces:

- Hello world
  C:                   hello_c.c
  C++:                 hello_cxx.cc
  Fortran mpif.h:      hello_mpifh.f
  Fortran use mpi:     hello_usempi.f90
  Fortran use mpi_f08: hello_usempif08.f90
  Java:                Hello.java
  C shmem.h:           hello_oshmem_c.c
  Fortran shmem.fh:    hello_oshmemfh.f90

- Send a trivial message around in a ring
  C:                   ring_c.c
  C++:                 ring_cxx.cc
  Fortran mpif.h:      ring_mpifh.f
  Fortran use mpi:     ring_usempi.f90
  Fortran use mpi_f08: ring_usempif08.f90
  Java:                Ring.java
  C shmem.h:           ring_oshmem_c.c
  Fortran shmem.fh:    ring_oshmemfh.f90

Additionally, there's one further example application, but this one
only uses the MPI C bindings:

- Test the connectivity between all processes
  C:   connectivity_c.c

The Makefile in this directory will build as many of the examples as
you have language support (e.g., if you do not have the Fortran "use
mpi" bindings compiled as part of Open MPI, the those examples will be
skipped).

The Makefile assumes that the wrapper compilers mpicc, mpic++, and
mpifort are in your path.

Although the Makefile is tailored for Open MPI (e.g., it checks the
"ompi_info" command to see if you have support for C++, mpif.h, use
mpi, and use mpi_f08 F90), all of the example programs are pure MPI,
and therefore not specific to Open MPI.  Hence, you can use a
different MPI implementation to compile and run these programs if you
wish.

Make today an Open MPI day!