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

This article discusses the "Unable to allocate memory for pool" error message in PHP.


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

Unable to allocate memory for pool


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 A2 Hosting Customer Portal at In the ticket, please provide the complete text of the error message you receive, as well as a reference to this Knowledge Base article.


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For more information about APC, please visit

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