Scoreboard cache refresh fails

Hi

We have this one giant practice session contest running all the time, and we want the scoreboard to work here. So the scoreboard.php when called uses more than 128M memory, and I increased the limit in /etc/php5/apache2/php.ini to 512M, so now that works to render the scoreboard. However, when I do scoreboard cache refresh, we still run out of memory, so I assume it uses a different php.ini? Where can I edit this file?

Thank you Parth Mittal