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POCalling cm.cublas_shutdown() in CUDAMat always raises exceptions
 

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  1. POCalling cm.cublas_shutdown() in CUDAMat always raises exceptions
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    <p>I tried running the example scripts <code>examples/nn_cudamat.py</code> and <code>examples/rbm_cudamat.py.py</code> included with the latest version of CUDAMat which wraps CUDA's cublas library and provides a Python matrix class for gpu computing.</p> <p>Both examples run fine but finish with multiple exceptions like this example:</p> <pre><code>Exception cudamat.CUDAMatException: CUDAMatException('CUBLAS error.',) in &lt;bound method CUDAMatrix.__del__ of &lt;cudamat.CUDAMatrix object at 0xf27290&gt;&gt; ignored </code></pre> <p>There were no failures running the nose tests after installation.</p> <p>I am not sure what exactly is causing the error but it seems to occur anytime <code>cm.cublas_shutdown()</code> is called at the end of a script where a <code>cm.CUDAMatrix</code> object was created.</p> <p>For example:</p> <pre><code>import numpy as np import cudamat as cm cm.cublas_init() cm.cublas_shutdown() </code></pre> <p>exits fine but:</p> <pre><code>import numpy as np import cudamat as cm cm.cublas_init() a = cm.CUDAMatrix(np.random.rand(5, 5)) print a.asarray() cm.cublas_shutdown() </code></pre> <p>runs fine but gives the exception at the end.</p> <p>CUDAMatrix.<strong>del</strong> frees the device memory corresponding the the matrix like this:</p> <pre><code>extern int free_device_memory(cudamat* mat) { if (mat-&gt;owns_data &amp;&amp; mat-&gt;on_device) { cublasStatus stat; stat = cublasFree(mat-&gt;data_device); mat-&gt;on_device = 0; if (stat != CUBLAS_STATUS_SUCCESS || check_cublas_error()) return CUBLAS_ERROR; } return 0; } </code></pre> <p>and cm.cublas_shutdown() does the following:</p> <pre><code>extern int cublas_shutdown() { cublasShutdown(); cudaThreadExit(); return 0; } </code></pre> <p>Someone else has the same problem and made an <a href="http://code.google.com/p/cudamat/issues/detail?id=12" rel="nofollow">issue</a> on the CUDAMat page a while back but there hasn't been any solution.</p> <p>So why is this happening?</p> <p>Some info:<br> Latest version of CUDAMat (docs say 0.3)<br> Python 2.6.6<br> [GCC 4.4.6 20120305 (Red Hat 4.4.6-4)] on linux2<br> Cuda Toolkit 5.0 </p>
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    1. UStalonmies
    1. USryguy
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    1. COI am getting the same error here! Have you solved your problem?
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      1. POCalling cm.cublas_shutdown() in CUDAMat always raises exceptions
      1. USMohammad Abdelaziz
    2. COI think it is caused by Python's garbage collection trying to free the CUDA memory by calling the .__del__ method of the CUDAMatrix class AFTER the cublas context has been shutdown. When I manually delete each CUDAMatrix object, `del matrix` for example, before the cublas.shutdown call, then there is no error message.
      singulars
      1. POCalling cm.cublas_shutdown() in CUDAMat always raises exceptions
      1. USryguy
    3. COMy problem was simpler. The cudamat was not loaded right, so I just replaced the cudamat code with the original code and everything worked fine.
      singulars
      1. POCalling cm.cublas_shutdown() in CUDAMat always raises exceptions
      1. USMohammad Abdelaziz
 

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