[Expat-bugs] [ expat-Bugs-1566826 ] More "Frees" than "Allocs"

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Bugs item #1566826, was opened at 2006-09-28 03:07
Message generated for change (Comment added) made by kwaclaw
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: More "Frees" than "Allocs"

Initial Comment:
I used the Expat 2.0 in our project and it seems to 
work fine. I did a kind of component test using the 
parser including testing the expat sources. As i wrote 
own memory allocation functions (called ONLY by expat 
sources) i saw that the free function is called more 
often than the alloc function. Nevertheless all memory 
areas allocated with alloc will be freed again.

Email: chris_1270 at web.de

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>Comment By: Karl Waclawek (kwaclaw)
Date: 2006-09-29 09:13

Message:
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As far as I remember, the memory consumption does not
increase a lot for larger files, but there is a certain
amount of memory allocated initially. Short of re-designing
Expat this cannot ve avoided.

However, you can probably reduce it by re-building Expat
with some symbols undefined, like XML_CONTEXT_BYTES or
XML_DTD (if not needed). There is also XML_MIN_SIZE to try.

Just search expat-discuss - there have been such discussions
in the past.


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Comment By: Nobody/Anonymous (nobody)
Date: 2006-09-29 03:57

Message:
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Sorry it was an error on my side in the functions which 
realized the counting of free and allocs. SO it seems to 
work fine. Sorry for your effort.

But i have got another question regarding the memory 
demand. So it seems that also for small XML documents a lot 
of heap is needed (e.g. for a document with 1000 Bytes 
about 4000 Bytes memory is allocated). Because i want to 
use the parser in an embedded device its a lot of memory 
for my project (perhaps too much!). Perhaps you have an 
idea that the parser needs less memory!?? 

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Comment By: Karl Waclawek (kwaclaw)
Date: 2006-09-28 09:17

Message:
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Should that not trigger some sort of error?
Any ideas which free calls are superfluous?

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