#----------------------------------*-sh-*--------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
#    \\/     M anipulation  | Copyright (C) 2017 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM.
#
#     OpenFOAM 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.
#
#     OpenFOAM 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 OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
#
# File
#     etc/config.sh/mpi
#
# Description
#     Setup file for communications library (MPI) for OpenFOAM
#     Sourced from OpenFOAM-<VERSION>/etc/bashrc
#
#     For USERMPI, the user is responsible for supplying an appropriate
#     wmake/rules/General/mplibUSERMPI file and managing all settings
#
#------------------------------------------------------------------------------
unset MPI_ARCH_PATH MPI_HOME
export FOAM_MPI=dummy  # Fallback value

case "$WM_MPLIB" in
SYSTEMOPENMPI)
    # Use the system installed openmpi, get library directory via mpicc
    export FOAM_MPI=openmpi-system

    # Undefine OPAL_PREFIX if set to one of the paths on foamOldDirs
    if [ -z "$($foamClean "$OPAL_PREFIX" "$foamOldDirs")" ]
    then
        unset OPAL_PREFIX
    fi

    # Bit of a hack: strip off 'lib' and assume it is the prefix for openmpi
    # include files and libraries.
    libDir=$(mpicc --showme:link | sed -e 's/.*-L\([^ ]*\).*/\1/')

    export MPI_ARCH_PATH="${libDir%/*}"
    _foamAddLib     $libDir
    unset libDir
    ;;

OPENMPI)
    export FOAM_MPI=openmpi-1.10.4
    _foamEtc config.sh/openmpi                  # <- Adjustments (optional)

    export MPI_ARCH_PATH=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$FOAM_MPI

    # Tell OpenMPI where to find its install directory
    export OPAL_PREFIX=$MPI_ARCH_PATH

    if [ "$FOAM_VERBOSE" -a "$PS1" ]
    then
        echo "Using $WM_MPLIB" 1>&2
        echo "    FOAM_MPI    : $FOAM_MPI" 1>&2
        echo "    OPAL_PREFIX : $MPI_ARCH_PATH" 1>&2
    fi

    # Could be sourced from ThirdParty with incomplete environment
    if command -v _foamAddLib > /dev/null 2>&1  # normal sourcing
    then
        _foamAddPath    $MPI_ARCH_PATH/bin
        _foamAddLib     $MPI_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH
        _foamAddMan     $MPI_ARCH_PATH/share/man
    fi
    ;;

USERMPI)
    # Use an arbitrary, user-specified mpi implementation
    export FOAM_MPI=mpi-user
    _foamEtc config.sh/mpi-user                 # <- Adjustments
    ;;

SYSTEMMPI)
    export FOAM_MPI=mpi-system
    _foamEtc config.sh/mpi-system               # <- Adjustments (optional)

    if [ -z "$MPI_ROOT" ]
    then
        echo 1>&2
        echo "Warning in $WM_PROJECT_DIR/etc/config.sh/mpi:" 1>&2
        echo "    Please set the environment variable MPI_ROOT to point to" \
             " the base folder for the system MPI in use." 1>&2
        echo "    Example:" 1>&2
        echo 1>&2
        echo "        export MPI_ROOT=/opt/mpi" 1>&2
        echo 1>&2
    else
        export MPI_ARCH_PATH=$MPI_ROOT

        if [ -z "$MPI_ARCH_FLAGS" ]
        then
            echo 1>&2
            echo "Warning in $WM_PROJECT_DIR/etc/config.sh/mpi:" 1>&2
            echo "    MPI_ARCH_FLAGS is not set. Example:" 1>&2
            echo 1>&2
            echo "        export MPI_ARCH_FLAGS=\"-DOMPI_SKIP_MPICXX\"" 1>&2
            echo 1>&2
        fi

        if [ -z "$MPI_ARCH_INC" ]
        then
            echo 1>&2
            echo "Warning in $WM_PROJECT_DIR/etc/config.sh/mpi:" 1>&2
            echo "    MPI_ARCH_INC is not set. Example:" 1>&2
            echo 1>&2
            echo "        export MPI_ARCH_INC=\"-isystem \$MPI_ROOT/include\"" 1>&2
            echo 1>&2
        fi

        if [ -z "$MPI_ARCH_LIBS" ]
        then
            echo 1>&2
            echo "Warning in $WM_PROJECT_DIR/etc/config.sh/mpi:" 1>&2
            echo "    MPI_ARCH_LIBS is not set. Example:" 1>&2
            echo 1>&2
            echo "        export MPI_ARCH_LIBS=\"-L\$MPI_ROOT/lib -lmpi\"" 1>&2
            echo 1>&2
        fi
    fi
    ;;

MPICH)
    export FOAM_MPI=mpich-3.2
    export MPI_ARCH_PATH=$WM_THIRD_PARTY_DIR/platforms/$WM_ARCH$WM_COMPILER/$FOAM_MPI
    export MPI_HOME=$MPI_ARCH_PATH

    # Could be sourced from ThirdParty with incomplete environment
    if command -v _foamAddLib > /dev/null 2>&1  # normal sourcing
    then
        _foamAddPath    $MPI_ARCH_PATH/bin
        _foamAddLib     $MPI_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH
        _foamAddMan     $MPI_ARCH_PATH/share/man
    fi
    ;;

MPICH-GM)
    export FOAM_MPI=mpich-gm
    export MPI_ARCH_PATH=/opt/mpi
    export MPICH_PATH=$MPI_ARCH_PATH
    export GM_LIB_PATH=/opt/gm/lib$WM_COMPILER_LIB_ARCH

    _foamAddPath    $MPI_ARCH_PATH/bin
    _foamAddLib     $MPI_ARCH_PATH/lib$WM_COMPILER_LIB_ARCH
    _foamAddLib     $GM_LIB_PATH
    ;;

HPMPI)
    export FOAM_MPI=hpmpi
    export MPI_HOME=/opt/hpmpi
    export MPI_ARCH_PATH=$MPI_HOME

    _foamAddPath $MPI_ARCH_PATH/bin

    case $(uname -m) in
    i686)
        _foamAddLib $MPI_ARCH_PATH/lib/linux_ia32
        ;;

    x86_64)
        _foamAddLib $MPI_ARCH_PATH/lib/linux_amd64
        ;;
    ia64)
        _foamAddLib $MPI_ARCH_PATH/lib/linux_ia64
        ;;
    *)
        echo Unknown processor type $(uname -m) 1>&2
        ;;
    esac
    ;;

MPI)
    export FOAM_MPI=mpi
    export MPI_ARCH_PATH=/opt/mpi
    ;;

FJMPI)
    export FOAM_MPI=fjmpi
    export MPI_ARCH_PATH=/opt/FJSVmpi2

    _foamAddPath    $MPI_ARCH_PATH/bin
    _foamAddLib     $MPI_ARCH_PATH/lib/sparcv9
    _foamAddLib     /opt/FSUNf90/lib/sparcv9
    _foamAddLib     /opt/FJSVpnidt/lib
    ;;

QSMPI)
    export FOAM_MPI=qsmpi
    export MPI_ARCH_PATH=/usr/lib/mpi

    _foamAddPath    $MPI_ARCH_PATH/bin
    _foamAddLib     $MPI_ARCH_PATH/lib
    ;;

SGIMPI)
    # No trailing slash
    MPI_ROOT="${MPI_ROOT%/}" # Remove trailing slash

    export MPI_ARCH_PATH="${MPI_ROOT%/}" # Remove trailing slash
    export FOAM_MPI="${MPI_ARCH_PATH##*/}"

    [ -d "$MPI_ARCH_PATH" ] || {
        echo "Warning in $WM_PROJECT_DIR/etc/config.sh/mpi:" 1>&2
        echo "    Not a valid $WM_MPLIB installation directory." 1>&2
        echo "    Please set MPI_ROOT properly (usually via the mpt module)" 1>&2
        echo "    Currently using '$MPI_ARCH_PATH'" 1>&2
    }

    if [ "$FOAM_VERBOSE" -a "$PS1" ]
    then
        echo "Using $WM_MPLIB" 1>&2
        echo "    FOAM_MPI : $FOAM_MPI" 1>&2
        echo "    MPI_ROOT : $MPI_ARCH_PATH" 1>&2
    fi

    _foamAddPath    $MPI_ARCH_PATH/bin
    _foamAddLib     $MPI_ARCH_PATH/lib
    ;;

INTELMPI)
    if [ -n "$I_MPI_ROOT" ]
    then
        # I_MPI_ROOT: The Intel MPI Library installation directory

        MPI_ARCH_PATH="${I_MPI_ROOT%/}" # Remove trailing slash
        FOAM_MPI="${MPI_ARCH_PATH##*/}"

        # If subdirectory is version number only, prefix with 'impi-'
        case "$FOAM_MPI" in ([0-9]*) FOAM_MPI="impi-$FOAM_MPI";; esac

        if [ "$FOAM_VERBOSE" -a "$PS1" ]
        then
            echo "Using $WM_MPLIB" 1>&2
            echo "    FOAM_MPI   : $FOAM_MPI" 1>&2
            echo "    I_MPI_ROOT : $MPI_ARCH_PATH" 1>&2
        fi
    else
        # MPI_ROOT: General specification
        MPI_ARCH_PATH="${MPI_ROOT%/}" # Remove trailing slash
        FOAM_MPI="${MPI_ARCH_PATH##*/}"

        # If subdirectory is version number only, prefix with 'impi-'
        case "$FOAM_MPI" in ([0-9]*) FOAM_MPI="impi-$FOAM_MPI";; esac

        if [ "$FOAM_VERBOSE" -a "$PS1" ]
        then
            echo "Using $WM_MPLIB" 1>&2
            echo "    FOAM_MPI : $FOAM_MPI" 1>&2
            echo "    MPI_ROOT : $MPI_ARCH_PATH" 1>&2
        fi
    fi

    [ -d "$MPI_ARCH_PATH" ] || {
        echo "Warning in $WM_PROJECT_DIR/etc/config.sh/mpi:" 1>&2
        echo "    Not a valid $WM_MPLIB installation directory." 1>&2
        echo "    Please set I_MPI_ROOT or MPI_ROOT properly." 1>&2
        echo "    Currently using '$MPI_ARCH_PATH'" 1>&2
    }

    export FOAM_MPI MPI_ARCH_PATH

    _foamAddPath    $MPI_ARCH_PATH/bin64
    _foamAddLib     $MPI_ARCH_PATH/lib64
    ;;
esac


# Add (non-dummy) MPI implementation
# - dummy MPI already added to LD_LIBRARY_PATH and has no external libraries
if [ "$FOAM_MPI" != dummy ] && type _foamAddLib > /dev/null 2>&1
then
    if [ -n "$FOAM_EXT_LIBBIN" ]    # External libraries (allowed to be unset)
    then
        _foamAddLib $FOAM_EXT_LIBBIN/$FOAM_MPI
    fi
    _foamAddLib $FOAM_LIBBIN/$FOAM_MPI
fi

# Alternative to 'mpiBufferSize' controlDict entry
#export MPI_BUFFER_SIZE=20000000

#------------------------------------------------------------------------------