Edit report at https://bugs.php.net/bug.php?id=63380&edit=1
ID: 63380
Updated by: tstarl...@php.net
Reported by: tstarl...@php.net
Summary: Allocation via libxml does not use PHP's per-request
allocator
Status: Assigned
Type: Bug
Package: XML related
Operating System: Linux
PHP Version: master-Git-2012-10-29 (Git)
Assigned To: rrichards
Block user comment: N
Private report: N
New Comment:
https://github.com/php/php-src/pull/223
Previous Comments:
------------------------------------------------------------------------
[2012-10-29 03:25:17] tstarl...@php.net
Description:
------------
Allocation via libxml does not use PHP's per-request allocator. So any memory
used by libxml will not be accounted against memory_get_usage() or memory_limit.
At Wikimedia we use libxml DOM trees to store wikitext parse trees, because
they are more compact in memory than the equivalent pure-PHP data structures.
When these parse trees are cached, the memory requirements can become
excessive, and the memory is typically not returned to the system after request
termination. Using xmlMemSetup() to set hook functions which use PHP's
per-request allocation functions will allow us to more effectively monitor and
limit the use of libxml in production.
I've developed a patch and will submit it to GitHub as a pull request.
Test script:
---------------
$doc = new DOMDocument;
for ( $i = 0; $i < 1000000 ; $i++ ) {
$doc->appendChild($doc->createElement('foo'));
}
print memory_get_usage()."\n";
Expected result:
----------------
312331440 (with debug and ZTS)
Actual result:
--------------
694256
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=63380&edit=1
