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POPython: Memory leak debugging
 

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    <p>I have a small multithreaded script running in django and over time its starts using more and more memory. Leaving it for a full day eats about 6GB of RAM and I start to swap.</p> <p>Following <a href="http://www.lshift.net/blog/2008/11/14/tracing-python-memory-leaks" rel="noreferrer">http://www.lshift.net/blog/2008/11/14/tracing-python-memory-leaks</a> I see this as the most common types (with only 800M of memory used):</p> <pre><code>(Pdb) objgraph.show_most_common_types(limit=20) dict 43065 tuple 28274 function 7335 list 6157 NavigableString 3479 instance 2454 cell 1256 weakref 974 wrapper_descriptor 836 builtin_function_or_method 766 type 742 getset_descriptor 562 module 423 method_descriptor 373 classobj 256 instancemethod 255 member_descriptor 218 property 185 Comment 183 __proxy__ 155 </code></pre> <p>which doesn't show anything weird. What should I do now to help debug the memory problems?</p> <p><em>Update:</em> Trying some things people are recommending. I ran the program overnight, and when I work up, 50% * 8G == 4G of RAM used. </p> <pre><code>(Pdb) from pympler import muppy (Pdb) muppy.print_summary() types | # objects | total size ========================================== | =========== | ============ unicode | 210997 | 97.64 MB list | 1547 | 88.29 MB dict | 41630 | 13.21 MB set | 50 | 8.02 MB str | 109360 | 7.11 MB tuple | 27898 | 2.29 MB code | 6907 | 1.16 MB type | 760 | 653.12 KB weakref | 1014 | 87.14 KB int | 3552 | 83.25 KB function (__wrapper__) | 702 | 82.27 KB wrapper_descriptor | 998 | 77.97 KB cell | 1357 | 74.21 KB &lt;class 'pympler.asizeof.asizeof._Claskey | 1113 | 69.56 KB function (__init__) | 574 | 67.27 KB </code></pre> <p>That doesn't sum to 4G, nor really give me any big data structured to go fix. The unicode is from a set() of "done" nodes, and the list's look like just random <code>weakref</code>s. </p> <p>I didn't use guppy since it required a C extension and I didn't have root so it was going to be a pain to build.</p> <p>None of the objectI was using have a <code>__del__</code> method, and looking through the libraries, it doesn't look like django nor the python-mysqldb do either. Any other ideas?</p>
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    1. CO"running in Django"? Do you mean that you're using the Django web server for doing additional non-web-service background processing? Have you considered splitting this non-web-serving stuff into a separate process?
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    2. COIt is a cron job that imports the Django settgings.py and uses many of the Django ORM features. So, it isn't spawned by a webserver, but still uses many of the features (which might have been pertinent)
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