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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
+;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages mpi)
+  #:use-module (guix packages)
+  #:use-module ((guix licenses)
+                #:hide (expat))
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages gcc)
+  #:use-module (gnu packages linux)
+  #:use-module (gnu packages pciutils)
+  #:use-module (gnu packages xorg)
+  #:use-module (gnu packages gtk)
+  #:use-module (gnu packages xml)
+  #:use-module (gnu packages ncurses)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages valgrind)
+  #:use-module (srfi srfi-1))
+
+(define-public hwloc
+  (package
+    (name "hwloc")
+    (version "1.9")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://www.open-mpi.org/software/hwloc/v"
+                                  version "/downloads/hwloc-"
+                                  version ".tar.bz2"))
+              (sha256
+               (base32
+                "0zjgiili2a8v63s8ly3a8qp8ibxv1jw3zbgm7diic3w1qgqiza14"))))
+    (build-system gnu-build-system)
+    (arguments
+     ;; Enable libpci support, which effectively makes hwloc GPLv2+.
+     '(#:configure-flags '("--enable-libpci")))
+    (inputs
+     `(("libx11" ,libx11)
+       ("cairo" ,cairo)
+       ("ncurses" ,ncurses)
+       ("expat" ,expat)))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (propagated-inputs
+     ;; 'hwloc.pc' refers to libpci and libnuma, hence the propagation.
+     `(("numactl" ,numactl)
+       ("pciutils" ,pciutils)))
+    (home-page "http://www.open-mpi.org/projects/hwloc/")
+    (synopsis "Abstraction of hardware architectures")
+    (description
+     "hwloc provides a portable abstraction (across OS,
+versions, architectures, ...) of the hierarchical topology of modern
+architectures, including NUMA memory nodes, sockets, shared caches, cores and
+simultaneous multithreading.  It also gathers various attributes such as cache
+and memory information.  It primarily aims at helping high-performance
+computing applications with gathering information about the hardware so as to
+exploit it accordingly and efficiently.
+
+hwloc may display the topology in multiple convenient formats.  It also offers
+a powerful programming interface to gather information about the hardware,
+bind processes, and much more.")
+
+    ;; But see above about linking against libpci.
+    (license bsd-3)))
+
+(define-public openmpi
+  (package
+    (name "openmpi")
+    (version "1.8.1")
+    (source
+     (origin
+      (method url-fetch)
+      (uri (string-append "http://www.open-mpi.org/software/ompi/v"
+                          (string-join (take (string-split version #\.) 2)
+                                       ".")
+                          "/downloads/openmpi-" version ".tar.bz2"))
+      (sha256
+       (base32
+        "13z1q69f3qwmmhpglarfjminfy2yw4rfqr9jydjk5507q3mjf50p"))))
+    (build-system gnu-build-system)
+    (inputs
+     `(("hwloc" ,hwloc)
+       ("gfortran" ,gfortran-4.8)
+       ("valgrind" ,valgrind)))
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (arguments
+     `(#:configure-flags `("--enable-static"
+                           "--enable-oshmem"
+                           ;; Thread support causes some applications to hang
+                           ;; "--enable-event-thread-support"
+                           ;; "--enable-opal-multi-threads"
+                           ;; "--enable-orte-progress-threads"
+                           ;; "--enable-mpi-thread-multiple"
+                           "--enable-mpi-ext=all"
+                           "--with-devel-headers"
+                           "--enable-debug"
+                           "--enable-memchecker"
+                           ,(string-append "--with-valgrind="
+                                           (assoc-ref %build-inputs "valgrind"))
+                           ,(string-append "--with-hwloc="
+                                           (assoc-ref %build-inputs "hwloc")))))
+    (home-page "http://www.open-mpi.org")
+    (synopsis "MPI-2 implementation")
+    (description
+     "The Open MPI Project is an MPI-2 implementation that is developed and
+maintained by a consortium of academic, research, and industry partners.  Open
+MPI is therefore able to combine the expertise, technologies, and resources
+from all across the High Performance Computing community in order to build the
+best MPI library available.  Open MPI offers advantages for system and
+software vendors, application developers and computer science researchers.")
+    ;; See file://LICENSE
+    (license bsd-2)))