FS#2154 See if the memory usage of the parser can be improved

Backend

• 

  2011-02-01 Michitux

  The PHP garbage collector has some problems with circular dependencies in versions prior to 5.3, so we should try if removing them helps.
  
  Christopher Smith suggested the following:
  
  Its convoluted code, but after a quick glance, a fix maybe to add a new line clearing $Handler in the finalise() method.
  
  722      function finalise() {
  +          unset($this->Handler);
  723      }
  
  and something similar at the end of finalise() in all the other classes which implement the Call Writer interface (not that we have an interface defined :-) )
  
  This needs to be tested.
• 

  2011-02-06 ChrisS

  Testing showed a small but not insigificant improvemment.  A page that would have a max memory usage of 20MB, improved to 16MB with unset() added to the finalise() methods.
• Related tasks:
  • FS#1357 Improve memory footprint in the parser/handler/render chain