我按如下所示安装了openmpi-4.0.0（https://www.open-mpi.org/software/ompi/v4.0/）
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<div id="root"></div>然后在包中输入示例文件夹，并使用命令：
./configure --prefix="/usr/local/openmpi"
make
sudo make install
export PATH=$PATH:/usr/local/openmpi/bin
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/openmpi/lib/
source ~/.bashrc
sudo ldconfig
它显示：
make
mpirun -n 4 ./hello_usempi
问题似乎只有一个处理器被激活。请注意，我的计算机上同时安装了openmpi-4.0.0和Ifort。任何人都可以帮我一下，谢谢。
我在此处添加命令Hello, world, I am 0 of 1: Open MPI v2.1.1, package: Open MPI buildd@lcy01-amd64-009 Distribution, ident: 2.1.1, repo rev: v2.1.0-100-ga2fdb5b, May 10, 2017
Hello, world, I am 0 of 1: Open MPI v2.1.1, package: Open MPI buildd@lcy01-amd64-009 Distribution, ident: 2.1.1, repo rev: v2.1.0-100-ga2fdb5b, May 10, 2017
Hello, world, I am 0 of 1: Open MPI v2.1.1, package: Open MPI buildd@lcy01-amd64-009 Distribution, ident: 2.1.1, repo rev: v2.1.0-100-ga2fdb5b, May 10, 2017
Hello, world, I am 0 of 1: Open MPI v2.1.1, package: Open MPI buildd@lcy01-amd64-009 Distribution, ident: 2.1.1, repo rev: v2.1.0-100-ga2fdb5b, May 10, 2017
和mpif90 -v的消息
mpirun -v
mpif90 -v Using built-in specs.
COLLECT_GCC=/usr/bin/gfortran
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-27ubuntu1~18.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs --enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr --with-gcc-major-version-only --program-suffix=-7 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie --with-system-zlib --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
mpirun -v代码在这里（Open MPI https://www.open-mpi.org/software/ompi/v4.0/的版权）
[mpiexec@tony-ThinkPad-P50] set_default_values (../../ui/mpich/utils.c:3178): no executable provided
[mpiexec@tony-ThinkPad-P50] HYD_uii_mpx_get_parameters (../../ui/mpich/utils.c:3620): setting default values failed
[mpiexec@tony-ThinkPad-P50] main (../../ui/mpich/mpiexec.c:438): error parsing parameters
makefile的内容很长，我认为在此处发布不方便，它仍在OpenMPI-4.0.0的安装包中。再次谢谢你。