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  <div class="section" id="openmpi">
<span id="openmpi"></span><h1>OpenMPI<a class="headerlink" href="#openmpi" title="Permalink to this headline">¶</a></h1>
<div class="section" id="prepare-an-openmpi-cluster">
<span id="prepare-an-openmpi-cluster"></span><h2>Prepare an OpenMPI cluster<a class="headerlink" href="#prepare-an-openmpi-cluster" title="Permalink to this headline">¶</a></h2>
<p>Run the following command to start a 3-node MPI cluster and one &#8220;head&#8221; node.</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="nb">cd</span> paddle/scripts/cluster_train_v2/openmpi/docker_cluster
kubectl create -f head.yaml
kubectl create -f mpi-nodes.yaml
</pre></div>
</div>
<p>Then you can log in to every OpenMPI node using ssh without input any passwords.</p>
</div>
<div class="section" id="launching-cluster-job">
<span id="launching-cluster-job"></span><h2>Launching Cluster Job<a class="headerlink" href="#launching-cluster-job" title="Permalink to this headline">¶</a></h2>
<p>Follow the steps to launch a PaddlePaddle training job in OpenMPI cluster:\</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span><span class="c1"># find out node IP addresses</span>
kubectl get po -o wide
<span class="c1"># generate a &quot;machines&quot; file containing node IP addresses</span>
kubectl get po -o wide <span class="p">|</span> grep nodes <span class="p">|</span> awk <span class="s1">&#39;{print $6}&#39;</span> &gt; machines
<span class="c1"># copy necessary files onto &quot;head&quot; node</span>
scp -i ssh/id_rsa.mpi.pub machines prepare.py train.py start_mpi_train.sh tutorial@<span class="o">[</span>headIP<span class="o">]</span>:~
<span class="c1"># login to head node using ssh</span>
ssh -i ssh/id_rsa.mpi.pub tutorial@<span class="o">[</span>headIP<span class="o">]</span>
<span class="c1"># --------------- in head node ---------------</span>
<span class="c1"># prepare training data</span>
python prepare.py
<span class="c1"># copy training data and dict file to MPI nodes</span>
cat machines <span class="p">|</span> xargs -i scp word_dict.pickle train.py start_mpi_train.sh machines <span class="o">{}</span>:/home/tutorial
<span class="c1"># creat a directory for storing log files</span>
mpirun -hostfile machines -n <span class="m">3</span> mkdir /home/tutorial/logs
<span class="c1"># copy training data to every node</span>
scp train.txt-00000 test.txt-00000 <span class="o">[</span>node1IP<span class="o">]</span>:/home/tutorial
scp train.txt-00001 test.txt-00001 <span class="o">[</span>node2IP<span class="o">]</span>:/home/tutorial
scp train.txt-00002 test.txt-00002 <span class="o">[</span>node3IP<span class="o">]</span>:/home/tutorial
<span class="c1"># start the job</span>
mpirun -hostfile machines -n <span class="m">3</span>  /home/tutorial/start_mpi_train.sh
</pre></div>
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