#PBS -q defq
    #PBS -l walltime=00:05:00
    #PBS -l cput=00:20:00
    #PBS -l nodes=4
    echo "========= begin =========="
    cd $PBS_O_WORKDIR 2>&1
    if test -x myprog ; then
   		mpiexec ./myprog 2>&1
    else
    echo "executable not found in "`pwd`
    fi
    echo "=========  end ==========="
    echo "done"