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假如你有很多VM， 你想快速利用VM来完成一些任务， 比如并行执行一些命令。网上有很多解决方案， 或者自己也可以写一些工具来完成, 但是有一个工具非常强大，而且是开源的。 下面简单介绍下mpirun.
installation
yum -y install openmpi-devel
# add path to ~/.bashrc for all nodes
export PATH=$PATH:/usr/lib64/openmpi/bin
同一个vm执行多个进程
mpirun --allow-run-as-root -np 3 --display-map echo rock
Data for JOB [2092,1] offset 0
======================== JOB MAP ========================
Data for node: drmcyc-fur5-1-01 Num slots: 12 Max slots: 0 Num procs: 3
Process OMPI jobid: [2092,1] App: 0 Process rank: 0
Process OMPI jobid: [2092,1] App: 0 Process rank: 1
Process OMPI jobid: [2092,1] App: 0 Process rank: 2
=============================================================
rock
rock
rock
不同vm执行单个进程
mpirun --allow-run-as-root -np 2 --display-map -host drmcyc-fur5-1-00 --host drmcyc-fur5-1-01 echo rock
Data for JOB [32409,1] offset 0
======================== JOB MAP ========================
Data for node: drmcyc-fur5-1-00 Num slots: 1 Max slots: 0 Num procs: 1
Process OMPI jobid: [32409,1] App: 0 Process rank: 0
Data for node: drmcyc-fur5-1-01 Num slots: 1 Max slots: 0 Num procs: 1
Process OMPI jobid: [32409,1] App: 0 Process rank: 1
=============================================================
rock
rock
不同vm执行多个进程
mpirun --allow-run-as-root -np 4 --display-map -host drmcyc-fur5-1-00,drmcyc-fur5-1-00,drmcyc-fur5-1-01,drmcyc-fur5-1-01 echo rock
Data for JOB [31300,1] offset 0
======================== JOB MAP ========================
Data for node: drmcyc-fur5-1-00 Num slots: 2 Max slots: 0 Num procs: 2
Process OMPI jobid: [31300,1] App: 0 Process rank: 0
Process OMPI jobid: [31300,1] App: 0 Process rank: 1
Data for node: drmcyc-fur5-1-01 Num slots: 2 Max slots: 0 Num procs: 2
Process OMPI jobid: [31300,1] App: 0 Process rank: 2
Process OMPI jobid: [31300,1] App: 0 Process rank: 3
=============================================================
rock
rock
rock
rock
host配置文件
cat tmp/hosts
10.207.65.19 slots=2 max_slots=20
10.207.69.19 slots=3 max_slots=20
mpirun --allow-run-as-root -np 4 --display-map --hostfile tmp/hosts echo rock
Data for JOB [25634,1] offset 0
======================== JOB MAP ========================
Data for node: 10.207.65.19 Num slots: 2 Max slots: 20 Num procs: 2
Process OMPI jobid: [25634,1] App: 0 Process rank: 0
Process OMPI jobid: [25634,1] App: 0 Process rank: 1
Data for node: drmcyc-fur5-1-01 Num slots: 3 Max slots: 20 Num procs: 2
Process OMPI jobid: [25634,1] App: 0 Process rank: 2
Process OMPI jobid: [25634,1] App: 0 Process rank: 3
=============================================================
rock
rock
rock
rock
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