Re: [xml] Memory not going away..

[Daniel Veillard <veillard redhat com>]

On Tue, Mar 08, 2005 at 05:52:09PM -0500, David W. Bauer Jr. wrote:
> One thing that I should mention is that the memory is NOT being released.
> I know this for a fact becuase my application goes on (afer freeing the
> xmlDoc) and allocates until the 3GB limit is reached.
> 
> So, what I see is this:
> 
> 	read / parse the file
> 
> 		--> memory consumed goes to 2.9GB
> 
> 	free the xmlDoc
> 
> 		--> memory consumption reported is still the same
> 
> 	alloc .1 GB more data structures, then malloc fails due to
> 	process memory limit.
> 
> So, the xmlDoc is NOT being freed in any way.

  My experience:
    dba100000.xml in the XML directory is 20 MBytes
    parsed as a DOM tree it uses 100MB of memory
    xmllint --repeat --noout dba100000.xml
    stay at 105MB memory usage in top looping 
      parsing/freeing
    my desktop has 512MB and didn't even swap during the experiment.
    System is libxml2 from CVS on an RHEL4 AS system.

I cannot reproduce your problem, or your problem is with the memory allocator
of the linux system you used.

> The purpose of the test case was to determine if the system would report
> the memory being freed with _fewer_ calls to the memory library, which is
> a valid approach since it isolates only the problem being addressed.  If I
> were to read/free the doc, then attempt to allocate more memory, it fails
> since the doc is still in memory.

  The document is being freed. libxml2 call free() unless somewhere
somthing changed the behaviour of xmlFree() in your program.

> One major difference is that I am now getting info in the .memdump file,
> which I did not get in my test script:

[...]
>       MEMORY ALLOCATED : 32092, MAX was 212704970

  libxml2 gave back the 2.1 GB of memory to the libc, it just has 
32 KBytes left.

Daniel

-- 
Daniel Veillard      | Red Hat Desktop team http://redhat.com/
veillard redhat com  | libxml GNOME XML XSLT toolkit  http://xmlsoft.org/
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