>From the search results, you'd see several links http://forums.zend.com. I'd say that's the best place to ask ;) From: Adi Mutu [mailto:adi_mutu06@xxxxxxxxx] Sent: Sunday, January 23, 2011 11:07 PM To: Tommy Pham Cc: php-general@xxxxxxxxxxxxx; Daniel Brown Subject: Re: Zend memory manager Of course I have tried, but nothing ....... The results or only aboyt emalloc/pemalloc familly. Nothing lower level about how these 2 functions are implemented or about the mm_heap struct of mm_block.....