Stab in the dark: after calling the Clear() method on object "tom" in method CreateTom, use "del tom" or "tom = None" to try and lose any remnant COM references before pythoncom.CoUninitialize() is called.
-------------------------> "These thoughts are mine alone!" <--------- Andrew MacIntyre Operations Branch tel: +61 2 6219 5356 Communications Infrastructure Division fax: +61 2 6253 3277 Australian Communications & Media Authority email: andrew.macint...@acma.gov.au<mailto:andrew.macint...@acma.gov.au> http://www.acma.gov.au/ From: python-win32 [mailto:python-win32-bounces+andrew.macintyre=acma.gov...@python.org] On Behalf Of Michael Watson Sent: Saturday, 4 May 2013 8:05 AM To: python-win32@python.org Subject: [python-win32] Memory Leak in Threaded COM Object I am creating a COM client within a thread and performing several operations with this client. Each thread is spawned from a server that uses Python's socketserver module which has built-in threading support. When I am loading and using this COM object there is an expected spike in memory usage by python.exe. With 10 concurrent threads there is a peak in memory usage of about 500Mb. However when the operations are finished and the COM object is apparently released, there are 50Mb of additional memory used by the process than before. If I then spawn 10 additional threads using the same server there are 13Mb additional used by python.exe after those COM objects are closed. Eventually every 10 additional concurrent threads adds approximately 6Mb after they are done. When I end the entire python.exe process, all the memory is released. I have simplified the following code to mimic how the socketserver uses threadding and the problem is the exact same. import win32com.client import threading import pythoncom def CreateTom(): pythoncom.CoInitialize() tom = win32com.client.Dispatch("TOM.Document") tom.Dataset.Load("FileName") tom.Clear() pythoncom.CoUninitialize() for i in range(50): t = threading.Thread(target = CreateTom) t.daemon = False t.start() I understand that I will unlikely get any support here around the specific COM library (it is an IBM product used in Market Research known as the TablesObjectModel). However I want to know if there is anything, ANYTHING, additional that I can do to release this memory. I have read about Apartments in COM but it sounds like pythoncom.CoInitialize should take care of this for me. Any help would be appreciated. NOTICE: This email message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message.
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