Server unresponsive - Any ideas?
 

Lately, many users were complaining about the site being slow (I also experienced such issues myself).

We installed microstats and found out that the problem is that those times that the page takes a long time to load, its because of PHP, and not mySQL (for instance: Page generated in 29,596240 seconds (99,26% PHP - 0,74% MySQL) with 25 queries).

If it was mySQL, it would be easier to troubleshoot it and find out which queries are slow. But how do I proceed now, that PHP is the problem?

Note: It doesn't happen every time a page is loaded, but some of the times.

Can you give us more information e.g, shared server, VPS, dedicated. Processor type/power, RAM. What Web Server software, e.g Apache/nginx etc.

I'm sorry, you're right, I should have provided more information.
The server is a dedicated server at rackspace.

• Memory: 6 GB DDR RAM
• Hard Drive: 250GB SATA
• Hard Drive: 250GB SATA
• Whitebox Server: Dual Socket Dual Core AMD Opteron 2214HE
• Linux OS: Red Hat Enterprise Linux 5 - 64 bit

The web server software is Apache.

--------------- Added [DATE]1224964644[/DATE] at [TIME]1224964644[/TIME] ---------------

By the way, when I disabled hooks (for myself only) it was still slow sometimes, even though the page generation time (provided by debug mode) was much less. :confused:

Have you already posted in the Server Configuration forum over at vb.com to get your server optimized?

No, should I?

Update your php maybe? Have you check your server error logs? Installed any mods lately?

I would recommend it. They have helped me get each of my servers running well (we've moved servers or changed configurations a few times over the years).

PHP is quite up to date (version 5.2.x). I haven't installed any mods lately (but I'm constantly adding some of my own). Nothing weird in the server error logs.

@Lynne: Thanks, I'll give it a try!

Hmmm - maybe some PHP issues.

Can you copy the board to a test environment enabling the PHP error reporting in case there's something wrong ?

What's your RAM usage? Try doing a grep command :)