[Python-bugs-list] [ python-Bugs-589149 ] Memory leakage in SAX with exception

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Bugs item #589149, was opened at 2002-07-31 17:02
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Category: XML
Group: Python 2.1.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Paolo Andreetto (pandreetto)
Assigned to: Nobody/Anonymous (nobody)
Summary: Memory leakage in SAX with exception

Initial Comment:
Trying the following test:

#!/usr/bin/python

import sys,string,StringIO,traceback,time,gc
import xml.sax,xml.sax.handler
gc.set_debug(gc.DEBUG_SAVEALL)

class SimpleHandler(xml.sax.handler.ContentHandler):
    def __init__(self):
        pass

    def startElement(self,name,attrs):
        print 'start ',name

    def endElement(self,name):
        print 'end ',name

    def characters(self,content):
        print content

class SimpleErrorHandler(xml.sax.handler.ErrorHandler):
    def __init__(self):
        pass
        
    def fatalError(self,e):
        print e

myHandler=SimpleHandler()
myErrHandler=SimpleErrorHandler()
data='<test>something</>'
while 1:
    gc.collect()
    print len(gc.garbage)
    
    try:
        #xml.sax.parseString(data,myHandler,myErrHandler)
        xml.sax.parseString(data,myHandler)
    except Exception, e:
        sinfo=sys.exc_info()
	traceback.print_tb(sinfo[2],None)
    time.sleep(1)

it seems that lots of object remain uncollectable.
Using the SimpleErrorHandler the behaviour of gc is
good but a memory leakage still remain (4Kb every 30
seconds).
Tests run on i386 with debian/Linux (sid), python 2.1.3
(Build of July 29th).

Thanks

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>Comment By: Paolo Andreetto (pandreetto)
Date: 2002-08-05 10:25

Message:
Logged In: YES 
user_id=551296

This is correct, it's my fault, but removing the
gc.set_dubug instruction the situation doesn't change. The
script is just a simple test, my trouble comes from a memory
leakage into SOAPpy module which uses another SAX-based
XML-parser.
If you think the problem doesn't depends on the python core,
please close this bug.
Thanks

----------------------------------------------------------------------

Comment By: Martin v. Löwis (loewis)
Date: 2002-08-05 04:06

Message:
Logged In: YES 
user_id=21627

Your analysis of this result is wrong. Instead, the result
shows that all objects *are* collectible, and that there is
merely cyclic garbage in case of a parser error - this
garbage *will* be collected, unless you explicitly ask the
GC to save it (which you do in your example).

----------------------------------------------------------------------

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