Maybe you could find and answer here:
http://drupal.org/node/81037
Some people have the same problem, i was this trouble in the past and i fix it
increasing the memory_limit in php.ini file
Anyway read the posts in the url that i wrote.
> To: php-general@lists.php.net; jcbo...@yahoo.com
> Date: Wed, 7 Jan 2009 15:21:50 +0000
> From: nrix...@gmail.com
> CC: php-general@lists.php.net
> Subject: [PHP] Re: Freeing memory for DOMDocument
>
> Christoph Boget wrote:
> > I'm running through a large dataset and am generating/manipulating XML
> > documents for each record. What's happening is that after a while, I
> > get a fatal error saying:
> >
> > Fatal error: Allowed memory size of 167772160 bytes exhausted (tried
> > to allocate 32650313 bytes)
> >
> > Each XML file I generate (an manipulate) can range from just a few
> > megs to upwards of 35 megs. Judging from the error above, it looks
> > like the memory for the DOMDocument objects I instantiate is not
> > getting freed; it just continues to stay in memory until the memory is
> > completely exhausted. The method (in my object) I am using to
> > instantiate a new DOMDocument is as follows:
> >
> > protected function createCleanDomDocument()
> > {
> > /*
> > if(( isset( $this->oDomXPath )) && ( !is_null( $this->oDomXPath )))
> > {
> > unset( $this->oDomXPath );
> > }
> >
> > if(( isset( $this->oDomDocument )) && ( !is_null( $this->oDomDocument
> > )))
> > {
> > unset( $this->oDomDocument );
> > }
> > */
> > $this->oDomDocument = new DOMDocument( '1.0', 'iso-8859-1' );
> > $this->oDomXPath = new DOMXpath( $this->oDomDocument );
> > }
> >
> > which is used in both the constructor of my object and in a few other
> > places. I would think that when the new DOMDocument is instantiated,
> > the memory used for the old value would get freed. As you can see,
> > I've even tried to unset the variables but that doesn't seem to help
> > matters much, either.
> >
> > Does anyone know how (or even if) I can explicitly free the memory
> > used for the DOMDocument? Any help/advice would be greatly
> > appreciated!
> >
> > thnx,
> > Christoph
>
> I've had exactly the same problem and couldn't find a way around it;
> even after unsetting every variable in my scripts inside a for/while
> loop; in the end I opted for a CLI script which opened worker threads
> then killed/restarted them when memory usage was X.
>
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