Setting up apache server-status module is always a good idea - as you
can (try) and see the information about load/requests etc.
wp-cron.php is a wrapper script around a whole system of potentially
complex functions which maintain the database (garbage collect etc) it
depends on what modules you have enabled how this is effecting the rest
of the server.
If it is locking every word press script you may find that every apache
child eventually handles a word press request (99 after the cron job
locked wordpress) and so there are no free apache children to handle
requests for static content...
(e.g. with 5 children ... static requests return the child to allow it
to accept another request - but when a wordpress request happens that
locks that child out
: Request : Children :
: /static.html : 1.... :
: /static.html : 1.... :
: /wp-cron.php : 1.... :
: /static.html : #2... :
: /wp.php : #2... :
: /static.html : ##3.. :
: /static.html : ##3.. :
: /wp.php : ##3.. :
: /static.html : ###4. :
: /static.html : ###4. :
: /wp.php : ###4. :
: /static.html : ####5 :
: /static.html : ####5 :
: /wp.php : ####5 :
: /static.html : ##### : <- hangs no free child
On 5/9/2016 9:26 PM, Christopher Schultz wrote:
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D'arcy,
On 5/9/16 2:16 PM, D'Arcy J.M. Cain wrote:
This weekend at various times my server was brought down. I saw
one process using over 99% of the CPU. No pages could be served
while this was going on. I found the culprit. It was a Wordpress
site and the script was wp-cron.php. I stopped it by adding a line
to wp-config.php as
http://geektnt.com/how-to-solve-wp-cron-php-high-cpu-usage.html
and other sites suggested.
However, I am still confused how this one process was able to block
all other pages. I have MaxClients set to 100 and 15 other cores
that they can be run on. Why didn't my server continue to serve
requests?
What kind of response were you getting from your server when you
connected with another client? Timeout? 503? 500?
If you tried to hit another WordPress page, it probably ALSO called
wp-cron.php which tried to hit the db to check for outstanding tasks,
and that call probably got blocked by a db record or table lock.
I'm guessing this is really a question for the WordPress community.
- -chris
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