Preconditions (*)

1. OpenMage 20.0.10

Steps to reproduce (*)

1. Create 11 catalog rules which apply discounts to products where category is one of 1,2,....N and at least 10 clauses where manufacturer is 1..N to apply a discount percentage
2. Use a medium sized catalog of about 40K products
3. Try to apply all rules

e.g.

Expected result (*)

1. Rules are applied

Actual result (*)

1. Memory exhausted. In my case it required 16GB of RAM to actually execute the \Mage_Adminhtml_Promo_CatalogController::applyRulesAction

e.g. to simulate in a CLI script

<?php
require_once('app/Mage.php');
umask(0);
Mage::app('admin');

ini_set('memory_limit', '1G');
Mage::getModel('catalogrule/rule')->applyAll();

Will yield

PHP Fatal error: Allowed memory size of 1073741824 bytes exhausted (tried to allocate 75497472 bytes) in /var/www/vhosts/example.com/httpdocs/app/code/community/Varien/Profiler.php on line 169

And it will crash until I put 16G in the limit.