Memory usage by class files

[Colin McKinnon]

Hi all,

I am currently working on a project which involves using a lot of code on
each page. I'm currently refactoring with a view to performance and have
discovered that when my app starts to include the class definitions it
needs, the memory gets eaten up *very* rapidly - indeed, typically, the
memory usage is TEN TIMES the size the class file occupied on the disk -
note this memory usage is only as a result of require_once() not objects
are instantiated, no code within the files has been run at this point.

(there are some hard stats below)

Has anybody else noticed this? Thought it a bit excessive? Found a more
efficient way of building the code (should I consider 'compiling' the
include files into a single one?). Unfortunately all the code is needed so
while the larger files do have more than one class definition there doesn't
seem to be much to be saved by using the autoloader.

TIA,

file mem used by require size on disk ratio
form.inc.php 704912 81766 8.62
widgets.inc.php 738800 57368 12.88
linked.inc.php 80920 7286 11.11
rawwidget.inc.p hp 74864 7497 9.99
iterator.inc.ph p 123536 11451 10.79

C.

[Manuel Lemos]

Re: Memory usage by class files

Hello,

on 03/30/2007 08:21 PM Colin McKinnon said the following:

Hi all,
>
I am currently working on a project which involves using a lot of code on
each page. I'm currently refactoring with a view to performance and have
discovered that when my app starts to include the class definitions it
needs, the memory gets eaten up *very* rapidly - indeed, typically, the
memory usage is TEN TIMES the size the class file occupied on the disk -
note this memory usage is only as a result of require_once() not objects
are instantiated, no code within the files has been run at this point.
>
(there are some hard stats below)
>
Has anybody else noticed this? Thought it a bit excessive? Found a more
efficient way of building the code (should I consider 'compiling' the
include files into a single one?). Unfortunately all the code is needed so
while the larger files do have more than one class definition there doesn't
seem to be much to be saved by using the autoloader.
>
TIA,
>
file mem used by require size on disk ratio
form.inc.php 704912 81766 8.62
widgets.inc.php 738800 57368 12.88
linked.inc.php 80920 7286 11.11
rawwidget.inc.p hp 74864 7497 9.99
iterator.inc.ph p 123536 11451 10.79

That is normal. PHP gets compiled into Zend Opcodes before executing.
That is mostly what compiled PHP takes in RAM. It has nothing to do with
classes.

--

Regards,
Manuel Lemos

Metastorage - Data object relational mapping layer generator

http://www.metastorage.net/

PHP Classes - Free ready to use OOP components written in PHP

http://www.phpclasses.org/

[Colin McKinnon]

Re: Memory usage by class files

Manuel Lemos wrote:

Hello,
>
on 03/30/2007 08:21 PM Colin McKinnon said the following:

>the memory gets eaten up *very* rapidly

That is normal. PHP gets compiled into Zend Opcodes before executing.
That is mostly what compiled PHP takes in RAM. It has nothing to do with
classes.
>

Thanks Manuel. I was worried it might just be me!

C.