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<h1>Troubleshooting</h1>
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<h2> Contents </h2>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#automatic-recovery">Automatic Recovery</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#recovery-failure-causes">Recovery Failure Causes</a></li>
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#verify-recovery-checkpoint-creation">Verify Recovery Checkpoint Creation</a></li>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#memory-issues">Memory Issues</a><ul class="nav section-nav flex-column">
<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#torch-cuda-cudaoutofmemoryerror">torch.cuda.CudaOutOfMemoryError</a><ul class="nav section-nav flex-column">
<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#during-initialization">During Initialization</a></li>
<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#during-sglang-generation">During SGLang Generation</a></li>
<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#during-actor-inf-or-actor-train">During <code class="docutils literal notranslate"><span class="pre">actor_inf</span></code> or <code class="docutils literal notranslate"><span class="pre">actor_train</span></code></a></li>
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<li class="toc-h3 nav-item toc-entry"><a class="reference internal nav-link" href="#cuda-error-out-of-memory">CUDA Error: Out of Memory</a></li>
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<section class="tex2jax_ignore mathjax_ignore" id="troubleshooting">
<h1>Troubleshooting<a class="headerlink" href="#troubleshooting" title="Link to this heading">#</a></h1>
<p>If the following content does not address your issue, feel free to raise a GitHub Issue.</p>
<section id="automatic-recovery">
<h2>Automatic Recovery<a class="headerlink" href="#automatic-recovery" title="Link to this heading">#</a></h2>
<p>When setting <code class="docutils literal notranslate"><span class="pre">recover_mode=auto</span></code> and the experiment configuration remains unchanged, AReaL will attempt to discover previous checkpoints and recover the experiment from them.</p>
<section id="recovery-failure-causes">
<h3>Recovery Failure Causes<a class="headerlink" href="#recovery-failure-causes" title="Link to this heading">#</a></h3>
<p>If automatic recovery fails, check the following possibilities:</p>
<p><strong>Configuration Changes:</strong></p>
<ul class="simple">
<li><p>The <code class="docutils literal notranslate"><span class="pre">experiment_name</span></code> and <code class="docutils literal notranslate"><span class="pre">trial_name</span></code> in the training script differ from the previous run</p></li>
<li><p>Changes in batch size (<code class="docutils literal notranslate"><span class="pre">dataset.train_bs_n_seqs</span></code> parameter)</p></li>
<li><p>Changes in group size (<code class="docutils literal notranslate"><span class="pre">group_size</span></code> parameter)</p></li>
<li><p>Changes in number of nodes (<code class="docutils literal notranslate"><span class="pre">n_nodes</span></code> parameter)</p></li>
</ul>
<p><strong>Missing Recovery Checkpoints:</strong>
Recovery checkpoints are generated under two conditions by default:</p>
<ul class="simple">
<li><p>After completion of the second step</p></li>
<li><p>When a step completes and more than 600 seconds have passed since the last recovery checkpoint (controlled by <code class="docutils literal notranslate"><span class="pre">exp_ctrl.ckpt_freq_secs=600</span></code>)</p></li>
</ul>
</section>
<section id="verify-recovery-checkpoint-creation">
<h3>Verify Recovery Checkpoint Creation<a class="headerlink" href="#verify-recovery-checkpoint-creation" title="Link to this heading">#</a></h3>
<p>You can confirm if a recovery checkpoint was generated by searching for the following message in the logs:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="o">(</span>master_worker/0<span class="w"> </span><span class="nv">pid</span><span class="o">=</span><span class="m">96390</span>,<span class="w"> </span><span class="nv">ip</span><span class="o">=</span>xxx.xxx.xxx.xxx<span class="o">)</span><span class="w"> </span><span class="m">20250222</span>-11:52:02.760<span class="w"> </span>master<span class="w"> </span>worker<span class="w"> </span>INFO:<span class="w"> </span>Dumped<span class="w"> </span>recover<span class="w"> </span>info<span class="w"> </span>to<span class="w"> </span>file.
</pre></div>
</div>
</section>
</section>
<section id="memory-issues">
<h2>Memory Issues<a class="headerlink" href="#memory-issues" title="Link to this heading">#</a></h2>
<section id="torch-cuda-cudaoutofmemoryerror">
<h3>torch.cuda.CudaOutOfMemoryError<a class="headerlink" href="#torch-cuda-cudaoutofmemoryerror" title="Link to this heading">#</a></h3>
<p>The key to resolving this issue is identifying the phase where the error occurs:</p>
<section id="during-initialization">
<h4>During Initialization<a class="headerlink" href="#during-initialization" title="Link to this heading">#</a></h4>
<ul class="simple">
<li><p>Check for idle processes on the GPU</p></li>
<li><p><strong>Distributed scenarios</strong>: Restart the Ray cluster</p></li>
<li><p><strong>Single-machine scenarios</strong>: Use <code class="docutils literal notranslate"><span class="pre">pkill</span></code> to terminate processes</p></li>
</ul>
</section>
<section id="during-sglang-generation">
<h4>During SGLang Generation<a class="headerlink" href="#during-sglang-generation" title="Link to this heading">#</a></h4>
<ul class="simple">
<li><p>Decrease the <code class="docutils literal notranslate"><span class="pre">actor.sglang.mem_fraction_static</span></code> parameter</p></li>
<li><p>Increase the tensor parallelism degree</p></li>
</ul>
</section>
<section id="during-actor-inf-or-actor-train">
<h4>During <code class="docutils literal notranslate"><span class="pre">actor_inf</span></code> or <code class="docutils literal notranslate"><span class="pre">actor_train</span></code><a class="headerlink" href="#during-actor-inf-or-actor-train" title="Link to this heading">#</a></h4>
<ul class="simple">
<li><p><strong>Adjust microbatch size</strong>: Set parameters like <code class="docutils literal notranslate"><span class="pre">actor_train.mb_spec.max_tokens_per_mb=20480</span></code>. This parameter limits tokens per forward/backward pass and can be set as low as the maximum sequence length (including prompt)</p></li>
<li><p><strong>Modify parallelism strategy</strong>: Adjust <code class="docutils literal notranslate"><span class="pre">allocation_mode</span></code> by:</p>
<ul>
<li><p>Reducing data parallelism</p></li>
<li><p>Increasing tensor or pipeline parallelism</p></li>
<li><p>Preferring pipeline parallelism over tensor parallelism</p></li>
</ul>
</li>
</ul>
</section>
</section>
<section id="cuda-error-out-of-memory">
<h3>CUDA Error: Out of Memory<a class="headerlink" href="#cuda-error-out-of-memory" title="Link to this heading">#</a></h3>
<p>This issue may occur during data transfer. Try increasing <code class="docutils literal notranslate"><span class="pre">mem_per_xx_worker</span></code> in the CLI arguments.</p>
</section>
</section>
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<li class="toc-h2 nav-item toc-entry"><a class="reference internal nav-link" href="#automatic-recovery">Automatic Recovery</a><ul class="nav section-nav flex-column">
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<li class="toc-h4 nav-item toc-entry"><a class="reference internal nav-link" href="#during-actor-inf-or-actor-train">During <code class="docutils literal notranslate"><span class="pre">actor_inf</span></code> or <code class="docutils literal notranslate"><span class="pre">actor_train</span></code></a></li>
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