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:
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlcw8msACgkQ9CaO5/Lv0PDhdwCfZQg66WfTk++WjLTsEBYMrnrD QVEAnipEMAPXxPhYRlz5/zYzJ8iueHYd =hyjH -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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