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POpython memory leak using wxPython
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  1. POpython memory leak using wxPython
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    copied!<p>I recently realised, that my program have a memory leak, it's small, but either, I think it shouldn't be there at all.</p> <p>Part which causes memory leak actually creates a new <code>wx.Panel</code> and add's it to interface using <code>wx.WindowSplitter</code> and then removes panel and un splits window.</p> <pre><code>self.getAction(self, event): if self.lastEdit[0] != None: if self.lastEdit[4] == STATEMENT: dialog = EditStatement(self.API.editorSplitter, self.API, self.lastEdit, self.statementUpdateClbk) elif self.lastEdit[4] == CONDITION: dialog = EditCondition(self.API.editorSplitter, self.API, self.lastEdit, self.conditionUpdateClbk) # Show or hide split window self.splitEditor(dialog) def splitEditor(self, editPanel): self.API.editorSplitter.Unsplit() if self.lastPanel != None: self.lastPanel.DissociateHandle() self.lastPanel.DestroyChildren() self.lastPanel.Destroy() self.lastPanel = editPanel if editPanel != None: self.API.editorSplitter.SplitVertically(self.API.tabManager, editPanel, -305) </code></pre> <p>Note that <code>EditStatement</code> un <code>EditCondition</code> is <code>wx.Panel</code> clases mentioned before. Calling <code>getAction()</code> in cycle randomly increases memory usage, the weirdest thing is, that at some iterations there is no change, at some iterations used memory even falls a bit, but at most iterations used memory grows. Here is some output of debug, made using <code>gc</code> module wrapper.</p> <p>Used code to test:</p> <pre><code>def cycler(self): while True: self.getAction(None) #Show window wx.YieldIfNeeded() self.mem() # prints memory information self.splitEditor(None) #Hide window wx.YieldIfNeeded() self.mem() # prints memory information </code></pre> <p>Output is as follows: </p> <blockquote> <pre><code>Window action - Action Object Count Create Window - Added StaticText 10 Create Window - Changed dict +1 Create Window - Added GridBagSizer 1 Create Window - Changed list +2 Create Window - Added CheckBox 4 Create Window - Changed ComboBox +6 Create Window - Added EditStatement 1 Create Window - Changed BoxSizer +1 Create Window - Changed instancemethod +15 Create Window - Count = 25453 Create Window - Memory(rss): 42528 Destroy Window - Changed dict -1 Destroy Window - Changed list -2 Destroy Window - Changed ComboBox -6 Destroy Window - Changed BoxSizer -1 Destroy Window - Changed instancemethod -15 Destroy Window - Deleted StaticText 10 Destroy Window - Deleted GridBagSizer 1 Destroy Window - Deleted CheckBox 4 Destroy Window - Deleted EditStatement 1 Destroy Window - Count = 25412 Destroy Window - Memory(rss): 42528 Create Window - Added StaticText 10 Create Window - Changed dict +1 Create Window - Added GridBagSizer 1 Create Window - Changed list +2 Create Window - Added CheckBox 4 Create Window - Changed ComboBox +6 Create Window - Added EditStatement 1 Create Window - Changed BoxSizer +1 Create Window - Changed instancemethod +15 Create Window - Count = 25453 Create Window - Memory(rss): 42536 Destroy Window - Changed dict -1 Destroy Window - Changed list -2 Destroy Window - Changed ComboBox -6 Destroy Window - Changed BoxSizer -1 Destroy Window - Changed instancemethod -15 Destroy Window - Deleted StaticText 10 Destroy Window - Deleted GridBagSizer 1 Destroy Window - Deleted CheckBox 4 Destroy Window - Deleted EditStatement 1 Destroy Window - Count = 25412 Destroy Window - Memory(rss): 42540 Create Window - Added StaticText 10 Create Window - Changed dict +1 Create Window - Added GridBagSizer 1 Create Window - Changed list +2 Create Window - Added CheckBox 4 Create Window - Changed ComboBox +6 Create Window - Added EditStatement 1 Create Window - Changed BoxSizer +1 Create Window - Changed instancemethod +15 Create Window - Count = 25453 Create Window - Memory(rss): 42552 Destroy Window - Changed dict -1 Destroy Window - Changed list -2 Destroy Window - Changed ComboBox -6 Destroy Window - Changed BoxSizer -1 Destroy Window - Changed instancemethod -15 Destroy Window - Deleted StaticText 10 Destroy Window - Deleted GridBagSizer 1 Destroy Window - Deleted CheckBox 4 Destroy Window - Deleted EditStatement 1 Destroy Window - Count = 25412 Destroy Window - Memory(rss): 42556 Create Window - Added StaticText 10 Create Window - Changed dict +1 Create Window - Added GridBagSizer 1 Create Window - Changed list +2 Create Window - Added CheckBox 4 Create Window - Changed ComboBox +6 Create Window - Added EditStatement 1 Create Window - Changed BoxSizer +1 Create Window - Changed instancemethod +15 Create Window - Count = 25453 Create Window - Memory(rss): 42576 </code></pre> </blockquote> <p>As You can see, used memory is increasing, but object count doesn't change after creation and deletion, I just don't understand what possibly can create such a memory leak. Any Ideas would be appreciated. In 45 minutes memory usage had grown from <code>~ 20 MB</code> to <code>~ 500 MB</code>. </p> <p>P.S. If anyone is interested, source code of created Panels can be found at: <a href="https://code.google.com/p/mansos/source/browse/trunk/tools/IDE/src/edit_statement.py" rel="nofollow">EditStatement</a> <a href="https://code.google.com/p/mansos/source/browse/trunk/tools/IDE/src/edit_condition.py" rel="nofollow">EditCondition</a></p> <p>P.S.S. I'm not sure, but I tend to think it's wx.Python bug, something with <code>wx.SplitterWindow</code></p>
 

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