mpi 和 mpich2 文件夹之间的区别?

问题描述

因此配置 MPI 标志我意识到在 /usr/include 目录中有两个文件夹具有相同的文件.所以有两个相关的问题:

so configuring the MPI flags I have realized that in the /usr/include directory there are two folders with the same files. So two related questions:

• 这对于 MPICH 安装是否正常?
• 它们之间有什么区别?

祝一切顺利，提前致谢

推荐答案

这取决于您的安装，但这是提供多个并行 MPI 安装的常用方法.

This can depend on your installation, but this is a common way for providing several parallel MPI installation.

我安装了 MPICH2 和 OpenMPI，/usr/include 中的这个文件夹:

I have both MPICH2 and OpenMPI installed, and this folders in /usr/include:

lrwxrwxrwx  1 root root     21 Apr  1 17:03 mpi -> /etc/alternatives/mpi/
drwxr-xr-x  3 root root   4096 Apr  1 17:03 mpich/
lrwxrwxrwx  1 root root     22 Nov 30 01:21 openmpi -> ../lib/openmpi/include/

和mpi文件夹是一个文件夹，应该作为#include来使用alternatives机制(我建议从this 和 这个，它可以在基于 Debian 的发行版以外的其他发行版上使用).

And mpi folder is a folder which should be used as #include to make use of alternatives mechanism (I recommend starting from this and this, it's available on other than Debian based distros).

如果您运行 update-alternatives --config mpi，您可以更改默认的 MPI 分发.

If you run update-alternatives --config mpi you can change the default MPI distribution.

例子，/etc/alternatives/mpi前后update-alternatives:

# before, pointing to MPICH2
lrwxrwxrwx 1 root root 18 Apr  1 17:14 /etc/alternatives/mpi -> /usr/include/mpich/
# and after, pointing to OpenMPI
lrwxrwxrwx 1 root root 24 Apr  1 17:07 /etc/alternatives/mpi -> /usr/lib/openmpi/include/

总结:

1. 使用 /usr/include/mpi/ 使您的代码尽可能具有可移植性.
2. 使用 update-alternatives 更改所需的 MPI 发行版.
3. 这是一种 alternatives 机制，可提供多种软件版本(和发行版)的简便方法.

1. Use /usr/include/mpi/ to make your code as much portable as possible.
2. Use update-alternatives to change the desired MPI distro.
3. This is a mechanism of alternatives to provide easy way of multiple version (and distributions) of software.

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