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I apologize in advance if this is wrong place to ask my question (mods: please move it to appropriate place)

I'm seeing following message in my wordpress logs:

PHP Warning: include(): Unable to allocate memory for pool.

and/or

PHP Warning: Unknown: Unable to allocate memory for pool. in Unknown on line 0

php -v:

# php -v
PHP 5.3.3 (cli) (built: Nov  7 2016 11:21:30) 
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
#

memory_limit and/or apc.shm_size set to 128M:

# grep ^memory_limit ./php.ini
memory_limit = 128M
# grep ^apc.shm_size ./php.d/apc.ini 
apc.shm_size=128M
#

I've tried setting memory_limit to -1 and/or 512M for test, yet same results (message above).

Please advise.

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  • WordPress enforces it's own memory limit on top of the php.ini's limit. It's possible that's the issue. Take a look at my answer here for more info and a potential solution. – DaveLak Jun 22 '18 at 17:00
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Does this topic help (it appears to be referencing the items you are looking at currently) https://stackoverflow.com/questions/3723316/what-is-causing-unable-to-allocate-memory-for-pool-in-php ?

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  • No, not really... I've tried to research for this issue prior asking my question and I find few similar to that posts, but that did not help resolve my issue( – alexus Jun 22 '18 at 20:16
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I had a similar problem. I caused it when tried increasing my memory limits by editing the. htaccess, wpconfig and wpsetup files. Undoing my changes didn't help so I just started over since it was a new setup. I would look at these files as a starting point.

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