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Advantages of multiple memcache bins?

Posted by kidsleep on October 2, 2009 at 4:19pm

I work for a company that has several drupal (5.x) sites that get ~1million page views per month. We run memcache (for other non-drupal purposes) and I recently installed the memcache module on a few of the drupal sites. I notice that we have 2 memcache servers each with only 1 bin of 16 gigs each. My understanding is that it's more efficient to run smaller, more specialized bins so I'm trying to get the sys ops people to bust up the memcache servers into smaller bins. Is this correct?

Strange occasional "the site not available" error

Posted by ajayg on October 3, 2009 at 6:21am

I am getting a strange "The site is currently not available due to technical problems" error but only occasionaly on a test server. There is no traffic on the server other than I manually testing. The strange thing is

Error happens only at first access of the domain after a long time
The immediate refresh works fine and sites shows again.
It shows up for several minutes (possibly hours) fine.
After some time (I am trying to nail this down) if you try again it suddenly shown the same error message.

Possible Performance module combos to use on site

Posted by manuj_78 on October 3, 2009 at 9:15pm

Hi,
I am trying to figure out combination of performance modules that can be used on a site (VPS server) without any possible side-effects

So far it seems Boost, javascript_aggregator can be used together on the site.

Can below modules also be be used alongside the above modules?
cache_router
authcache,
fastpath_fscache,
pathcache
blockcache_alter

What about advcache? Can it be used alongside any of the above modules?
http://drupal.org/project/prev_next

Also, which is better to use in terms of caching for a VPS

Database, file, PHP opcode, memory?

DB Impact

Posted by navaneeth_r on October 5, 2009 at 1:53pm

Hi,
On analyzing the process list in our heavy traffic site, we found numerous "lock/Unlock {cache} table " sleep queries.
Is it neccessary to lock cache tables whenever we update/insert cache.
In drupal 6 version of cache_set() the db_lock_table()/ db_unlock_table() has been removed.
Can we do this changes in drupal5?.
Will this affect sites default cache mechanism and performance?.

Mercury Update: Beta Coming Soon!

Posted by joshk on October 7, 2009 at 8:51pm

Just wanted to let everyone know we're hard at work on a Beta release of Project Mercury. Currently we are tuning Varnish further, working to package Apache Solr on board as the search backend, and testing the whole system for bugs. We will likely issue one more alpha release (0.6) before we get to a Beta, but I want to have that launch by the end of the month if possible.

The high level road map:

Package Solr
Improve default Varnish config
Thoroughly document "putting your site on mercury"
Resolve lingering bugs (e.g. cron.php issues)

Once we hit Beta we'll be pushing for wider adoption, which means pursuing alternate non-Amazon hosting options. Currently we're looking at alternate cloud providers, VPS partnerships, and other packaging options like VM images, etc. So stay tuned, and let us know what else you'd like to see us look at including early in the Beta cycle!

4 Processors, 16GB memory, my.cnf?

Posted by mmilano on October 8, 2009 at 10:34pm

Does anyone have a my.cnf example I could use as a starting point for a dedicated DB server with 4 processors and 16 GB of memory? The only other dedicated servers with these stats I have access to are running postgres.

Project Mercury Alpha 6: Now With Solr!

Posted by joshk on October 9, 2009 at 9:50pm

I'm happy to announce the 0.6 Alpha release of the Mercury AMI, now including ApacheSolr as the search backend! This is the last piece of major infrastructure we want to integrate into the stack for scalability purposes. You can now move from a single-server install based on Mercury to a best-practice vertically scaled architecture with separate hardware to run front-end cache, application, back-end cache, search and database!

The quickest way to find it is by searching Amazon EC for "Pantheon" or "Mercury". The manifest path for the latest release (in 32bit and 64 bit flavors) is:

chapter3-storage/PANTHEON-pressflow-mercury-alpha-6.manifest.xml
chapter3-storage/PANTHEON-pressflow-mercury64-alpha-6.2.manifest.xml (back!)

If you'd like to "roll your own" we've updated the wiki instructions page with a new set of instructions for getting Solr up and running as part of the process. Feel free to improve that documentation, as it's definitely a community process.

This will likely be one of the last releases before we move the project into the Beta phase, at which point we'll be focusing on fine tuning and stability as well as portabilty onto non EC2 systems moreso than new features. If you have ideas for additional things you'd like to see integrated in the stack, please chime in. We're also going to be documenting real-world "how to" use-cases — e.g. "how do I put my existing site on Mercury" in user-friendly detail — so stay tuned for that.

As always, let us know what you think of the release, what you'd like to see in future iterations, and how your experience is in using the stack. There's plenty more to come.

Anyone have a D6 WAMP Stack + APC (or other Op-Code Cache) Setup That Works?

Posted by ISPTraderChris on October 9, 2009 at 11:00pm

I've had some tough luck trying to get APC (or any Op-Code Cacher) running on my WAMP stack with any sort of success. Ideally, I'd like to be running APC (most stable?) but in lieu of that I'd go with XCache or eAccellerator. Currently, when I enable APC, I am able to see that it is running via the APC.php script, but accessing my Drupal Site gives me a Fatal Error:

"Fatal error: Call to undefined function db_set_active() in C:\Documents and Settings\Administrator\Sites\acquia-drupal-site\acquia-drupal\includes\bootstrap.inc on line 1016"

Memcache cluster with Cacherouter

Posted by james_agnew on October 10, 2009 at 10:46am

Hello

We have four load-balanced Apache servers (Ap1, Ap2, Ap3, Ap4) all pointing to a single MySQL server master server, which has a single Slave. We are running Pressflow 6.14.

What I'd really appreciate some advice on please is how best to configure Memcache and which module (cacherouter or memcache) I should use.

My thought was to create indentical bins on all 4 servers, something like this (Ap1,2,3,4 etc would be replaced by IP addresses):

<?php

$conf['cache_inc'] = './sites/all/modules/contrib/cacherouter/cacherouter.inc';
$conf['cacherouter'] = array(

Captcha doesnot work with Page cache

Posted by navaneeth_r on October 12, 2009 at 12:58pm

Drupal version: 5.3
Captcha module version: 5.x-3.1

The current version of Captcha doesnot work with Page cache enabled. This could be a big disadvantage in a large site with many pages. To resolve the same and cache the page content we could apply the below patch.

Refer patch at http://drupal.org/node/602226.

We could furthur enhance and work towards removing session for anonymous user entirely and cache the captcha along with the page cache, refersh it only when used. Any suggestions.

Thanks

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