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memory leak in python extension; mysqlclient & numpy

John Hunter jdhunter at nitace.bsd.uchicago.edu
Wed Oct 9 14:19:16 EDT 2002 
>>>>> "John" == John Hunter <jdhunter at ace.bsd.uchicago.edu> writes:

    John> I am writing a python extension to load some data from a
    John> mysql database directly into some numpy arrays.  There is a
    John> memory leak, which I see when running top while repeatedly
    John> calling the function get_quotes included below.  Can anyone
    John> offer some advice about where this leak is occurring?

OK, found the leak.  The problem is that I need Py_DECREF my arrays
after building them into the tuple for return, as in 

  PyArrayObject *p,*v,*t;
  PyObject *tup;

[ snip ]

  p = (PyArrayObject *)PyArray_FromDims(1,dimensions,PyArray_FLOAT);
  v = (PyArrayObject *)PyArray_FromDims(1,dimensions,PyArray_INT);
  t = (PyArrayObject *)PyArray_FromDims(1,dimensions,PyArray_LONG);

[ snip ]

  tup =  Py_BuildValue("(OOO)", p,v,t);
  Py_DECREF(p);
  Py_DECREF(t);
  Py_DECREF(v);
  return tup;

Live and learn....

JDH
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