Bug #14263: Don't free each allocation in cgimode
| From: | samjam@php.net | Date: | Wed, 28 Nov 2001 09:00:09 +0000 |
| Subject: | Bug #14263: Don't free each allocation in cgimode | ||
| Groups: | php.dev | ||
| Request: | Send a blank email to php-dev+get-71888@lists.php.net to get a copy of this message | ||
From: samjam@php.net
Operating system: all
PHP version: 4.0.6
PHP Bug Type: Performance problem
Bug description: Don't free each allocation in cgimode
If compiled in standalone cgi mode, when the script exits, php only needs
to free resources, not other arrays or strings or items (unless we ever
support object destructors).
It can take a LONG time to free a hundred thousand or so elements in nested
arrays, 4 or 5 times longer than it takes to create then.
See these threads in phpdev mailing list:
Re: [PHP-DEV] maybe serious error in RC3 memory manager
RE: [PHP-DEV] CGI quick cleanup
Sample code:
Note how long it takes to exit after finishing.
#! /usr/bin/php -q
<?php
ini_Set("max_execution_time","0");
ini_Set("memory_limit","500M");
class thingy {
function thingy($c) {
if ($c>0) $this->ref=&new thingy($c-1);
}
}
$stash=array();
$max=500000;
$start=time();
for($i=0;$i<$max;$i++) {
$r=rand(0,300);
$stash[$r][]=&new thingy(rand(0,10));
echo "\rUse: ".floor($i/$max*100)."% ";
}
echo "\n";
$mid=time();
$max=count($stash);
$c=0;
foreach(array_keys($stash) as $key) {
unset($stash[$key]);
$c++;
echo "\rFree: ".floor($c/$max*100)."% ";
}
unset($stash);
echo "\n";
$done=time();
print "Use: ".($mid-$start)."\n";
print "Free: ".($done-$mid)."\n";
?>
--
Edit bug report at: http://bugs.php.net/?id=14263&edit=1