How to fix the 'Unable to allocate memory for pool' PHP error

Problem

When you try to view a page running PHP, you receive the following error message:

Unable to allocate memory for pool

Resolution

To resolve this problem, our Guru Crew must adjust APC (Alternative PHP Cache) configuration settings for your account. Please open a support ticket on the Hostvento Hosting Customer Portal at https://hostvento.com. In the ticket, please provide the complete text of the error message you receive, as well as a reference to this Knowledge Base article.