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High PHP processes causing Server to run out of memory

tanyawright — Wed, 04 Mar 2015 02:46:54 +0000

I recently migrated my site (about a month ago) but for the last week i have been having a lot of trouble with the server running out of memory and becoming unresponsive. I have been told by my host that it is running out of memory because of a high number of php processes. I am using Reganto Premium theme and my plugins are;

AdRotate

Contact Form 7

Custom Post Type UI

Disable XML-RPC

Duplicate Post

Easy Post Display

Events Manager

Facebook Comments by Fat Panda

Heartbeat Control

Imsanity

WPBakery Visual Composer

My Custom CSS

P3 (Plugin Performance Profiler)

Plugin Organizer

Pointelle Slider

Redirection

Remove query strings from static resources

Revision Control

Simple Image Sizes

Social Media Tabs

UberMenu 3 – The Ultimate WordPress Mega Menu

UK Cookie Consent

Use Google Libraries

WordPress SEO

WP Post Template

WP-Optimize

WP-Polls

Custom Maintenance Mode

Reveal IDs

Some i disable and enable as and when i need them.
I am not by no means the most experienced so what could be causing these high numbers of php processes?

Thanks

HTTP/PHP Processes Killing Server

Laguna Ocean — Wed, 28 Nov 2012 21:07:57 +0000

I have recently moved my WP website from a subdomain to the top domain of my vps. Everything was working just fine on the subdomain, but right after i have uploaded database and files to the public_html folder i have noticed multiple php processes “eating” 100% of the process.
I started to investigate and tried few things, like dropping database and re-uploading it, erasing all plugins (from db as well), erasing all files, but nothing worked as on subdomain (i did changed all the paths in the db file accordingly).
I had to google for the problem, after seeing some of these php processes were looking like this:

write(4, “\275\3SELECT t.*, tt.* FROM wpone”…, 193) = 193
read(4, “\1\1\n=\2\3def\voneshopp_db\1t\rwpon”…, 16384) = 743
access(“/home/user/public_html/wp-content/themes/compare/footer.php”, F_OK) = 0
time(NULL) = 1354130656
lstat64(“/home/user/public_html/wp-content/themes/compare/footer.php”, {st_mode=S_IFREG|0644, st_size=1450, …}) = 0
lstat64(“/home/user/public_html/wp-content/themes/compare”, {st_mode=S_IFDIR|0755, st_size=4096, …}) = 0
lstat64(“/home/user/public_html/wp-content/themes”, {st_mode=S_IFDIR|0755, st_size=4096, …}) = 0

And found like a solution to replace wp-includes/http.php with a modified version. By doing that i actually reduced my vps load from 15 to 0.25, some of the php processes were still there but they were not consuming that much cpu.

Obviously, the http.php version i’ve uploaded was incorrect, i ended up with Fatal error: Cannot redeclare class WP_Http in /home/user/public_html/wp-includes/class-http.php on line 34

I had to place back the original WP 3.4.2 http.php file.
Does anyone have any clue about the cause of the problem i’ve encountered after i’ve moved the WP site from subdomain to a main domain (basically from one folder to another) ?

Any suggestions, ideas on how can this be fixed is highly appreciated.
Thank you.
Laguna

500 Error Deleting Excess DB tables Created by Excessive Plugin Use

Johanhorak — Sat, 04 Feb 2012 06:39:35 +0000

I my site get’s killed once a day due to what Hostgastor describes as:

I’m showing here that you’re queries need to be optimized. Below is an example of one of your queries that was getting killed due to the amount of time it was taking to execute, you’ll notice it’s a huge query:
[ 1328286601 ] [ johanhor_johanmu ] [ 2162627 ] [ 27 ] [ johanhor_johanmu ] [ Query ] [ KILLED ] [ ] [ SELECT t.*, tt.*, tr.object_id FROM wp_56_terms AS t INNER JOIN wp_56_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_56_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN (‘category’, ‘post_tag’, ‘post_format’) AND tr.object_id IN (8222, 8221, 8219, 8216, 8217, 8218, 8220, 8215, 8214, 8213, 8209, 8208, 8207, 8206, 8203, 8202, 8201, 8199, 8198, 8197, 8196, 8194, 8193, …………………………….(this continue for a page long).

This one query is being executed, and killed as it’s taking too long to execute which in turn caused your site to receive the 500 error due to so many hanging PHP processes waiting on these types of queries to complete. Once you optimize your queries you shouldn’t receive these errors anymore. Here is a great resource on how to optimize your queries: https://hackmysql.com/nontech

I have read through the above and am clueless.

I then came across this https://revellian.com/2008/07/14/how-to-clean-wp-options-slow-mysql-queries/

And checked all my database tables under my multi install wordpress site. I have more than 1000 DB tables (I assume; due to excessive plugin use; plugins that i have killed to a few).

I thought why not kill the excessive DBs. But I have no idea what to leave and what to kill.

I hope you van help. Thanks Johan.

How many PHP processes ?

Mon, 28 Mar 2011 18:59:04 +0000

Hi,

I know this question depends on a lot of things, but I got a site with about 500 visitors and around 800 pageviews, nothing crazy. I do have W3 Total Cache installed and using Amazon S3 as CDN. But today my host told me my site used around 65-70 PHP processes, so they disabled my site for a while.

I have been looking at the CPU usage (shared hosting) all day, it does spike sometimes (700-1000 %) but it also happens when there’s no visitors or my site.

So is 65-70 PHP processes way to many for a site my size or is it my host that got too many accounts on the server I’m on ?

500 Internal Server Errors with DreamHost

John — Wed, 21 Jul 2010 09:37:41 +0000

FWIW DreamHost’s shared server hosting has more or less become useless to me due to 500 Server errors…

“But regardless, the problem is that you are using too much memory, and that your PHP processes are hitting our process watcher which is why it’s showing the 500 error.”

So basically the amount of storage space and bandwidth is immaterial. The problem, for me anyway, with DreamHost shared hosting and WordPress is the amount of memory allotted- and they don’t give you that information- they won’t tell me how much memory I’m using or how much I’m allowed.
This is a single WP install on a unique user with little to no traffic and Super Cache installed.
It’s happening on all my WP sites but where I have more active plugins it’s worse.
I was looking forward to WP 3 and multi-sites. I don’t feel confident in even trying a multi-site install on DreamHost.
This only started happening around April 2010 when I was moved to a new server. I was previously happy at DH. Wouldn’t recommend it to anyone running WP now.