第 24 章 在 HPC 环境中使用 Podman

流程

1. 安装 Open MPI:

   # dnf install openmpi

2. 要激活环境模块，请输入：

   $ . /etc/profile.d/modules.sh

3. 加载 mpi/openmpi-x86_64 模块：

   $ module load mpi/openmpi-x86_64

   另外，要自动载入 MPI/openmpi-x86_64 模块，请将此行添加到 .bashrc 文件中：

   $ echo "module load mpi/openmpi-x86_64" >> .bashrc

4. 要将 mpirun 与 podman 相结合，请使用以下定义创建一个容器：

   $ cat Containerfile
   FROM registry.access.redhat.com/ubi9/ubi
   
   RUN dnf -y install openmpi-devel wget && \
       dnf clean all
   
   RUN wget https://raw.githubusercontent.com/open-mpi/ompi/master/test/simple/ring.c && \
       /usr/lib64/openmpi/bin/mpicc ring.c -o /home/ring && \
       rm -f ring.c

5. 构建容器：

   $ podman build --tag=mpi-ring .

6. 启动容器。在有 4 个 CPU 的系统上,这个命令会启动 4 个容器：

   $ mpirun \
      --mca orte_tmpdir_base /tmp/podman-mpirun \
      podman run --env-host \
       -v /tmp/podman-mpirun:/tmp/podman-mpirun \
       --userns=keep-id \
       --net=host --pid=host --ipc=host \
       mpi-ring /home/ring
   Rank 2 has cleared MPI_Init
   Rank 2 has completed ring
   Rank 2 has completed MPI_Barrier
   Rank 3 has cleared MPI_Init
   Rank 3 has completed ring
   Rank 3 has completed MPI_Barrier
   Rank 1 has cleared MPI_Init
   Rank 1 has completed ring
   Rank 1 has completed MPI_Barrier
   Rank 0 has cleared MPI_Init
   Rank 0 has completed ring
   Rank 0 has completed MPI_Barrier

   mpirun 会启动 4 个 Podman 容器，每个容器都运行一个 ring 二进制的实例。所有 4 个进程都通过 MPI 进行沟通。