apc

Hi all.

I use a CentOS server to deploy a Drupal site. I use ~50 drupal projects (> 100 modules) for this site. When I enable APC, the Web server often auto-restart.

My server's information:
+ CentOS
+ Apache 2.2.3
+ PHP 5.3.8
+ APC 3.1.9

• If I disable APC, the error doesn't occur. The site work correctly.
• In my local PC, I use ubuntu with Apache 2.2.14, PHP 5.3.2, APC 3.1.9 => The site work correctly without this error.

=> Could you help me?

I would like to know your thoughts on Drupal and its performance, and especially how to improve it.

We currently use a system based on Drupal 6.22 Project Mercury (Pressflow, Varnish, APC ...) specially designed for heavy traffic. And we have installed more 50 modules like (Views, CCK, Panel, VBO, Rules, Workflow, UberCart, Solr…)

But our production server is a virtual environment with 4 CPUs and 8 GB of Ram, which is really huge for a single site. During our peak traffic, we have over 1,800 visits and more than 50 connected users for one day.

Using the APC module for D7 - I've done a very quick performance test, just to give an idea of what you might expect when serving cached pages (anonymous users) - I hope this is useful to someone:

We are in the process of getting ready to release a game in the next few months, most of all the back-end is handled by drupal and some custom plugins, but we are now looking to move towards the cloud and making sure drupal and the db can handle the traffic.

I have started down the road of googling all over the and of course ran into project mercury / panthon / press flow etc..

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p>I have a site running Pressflow (Drupal 6), Varnish, Memcached, and APC with the Cache Router module. I'm unsure why but APC is restarting every 10-20 minutes. If I review the stats page (see the attached image) the uptime will increase to somewhere between 10 and 20 minutes. As I click the "refresh data" button I'll see a second cache set shown with an uptime of 0 or 1 minute, and each click of refresh data will toggle between uptime of 15 minutes and uptime of 1 minute. Eventually the 15 minute uptime disappears and I only see the 1 minute uptime...

So now we've evolved and moved forward in the development of the Special Olympics site, and some of you will remember my questions about how to choose a web hosting service. Although we chose Webfaction, we may need to move to a dedicated server and VPS, but in truth, I am VERY confused about how to KNOW what our site performance needs, and memory needs, truly are. PLEASE offer advice if you can.

Comparação de várias backends e módulos de cache no Drupal.
Inclui um odt e pdf anexados.

Benchmarking tests for a heavy drupal 6 demo site

Characteristics:

• Linode VPS, 1GB RAM, single server setup
• Debian GNU/Linux 5.0 64-bit
• Kernel 2.6.35.4-x86_64-linode16, x86_64
• Apache 2.2.9
• PHP 5.2.6, running as FastCGI
• APC 3.0.19
• Memcached 1.2.2
• MySQL 5.0.51
• Drupal 6.20
• Authenticated User Page Caching (authcache) 1.0-rc2
• Cache Router (cachrouter) 1.0-rc1
• Cache Router Statistics (cacherouter_stats) 1.0-beta3
• Memcache API and Integration (memcache) 1.0-beta3
• JavaScript Aggregator (javascript_aggregator) 1.5
• CSS Gzip (css_gzip) 1.3
• heavy drupal site (182 modules, 95 projects)

First, many thanks for the invaluable tuning discussions/resources here and on 2bits. They've been most helpful.

Lately I've been testing a change from:
mpm_prefork
suEXEC
suPHP
zend Optimizer

to the recommended:
mpm_worker
suEXEC
mod_fcgid (2.3.6)
APC (3.1.7)

I mainly followed the excellent instructions and relative values used here: http://2bits.com/articles/apache-fcgid-acceptable-performance-and-better...

Hey Folks;

I've been doing a lot of performance tweaking with some of the sites I run (specifically http://latam.kaspersky.com). We have been running Varnish for some time and I recently managed to convince the powers-that-be that APC is perfectly safe and we're nuts for not running it.

I have a dedicated server currently hosting more than a dozen sites running from a single install of drupal (MultiSite).

I have installed APC on the server to attempt to alleviate this include overhead. My current configuration looks like

[apc]
apc.enabled = 1
apc.include_once_override = 1
apc.shm_size = 32M
apc.stat = 0
apc.ttl = 0

The issue is when I install the packaged apc.php to one of the site's document root, I only ever see something like below

http://screencast.com/t/NTY2NmM4MmI