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From Jeff Peng <>
Subject Re: Ways to scale a mod_perl site
Date Thu, 17 Sep 2009 05:57:35 GMT
How many servers?
We have run the systems with about 500 million PV each day, with many squid boxes + 200 apache
webservers + 200 mysql hosts.
The applications were written with FastCGI.

-----Original Message-----

From: Igor Chudov 

Sent: Sep 16, 2009 11:49 AM

To: Mod_Perl 

Subject: Ways to scale a mod_perl site

My server serves about 77k pageviews and a little over a million objects requests
per day (with half of it being served in just 4 hours). I peak out at 35 requests per second

I use mod_perl, mysql, and perlbal with everything running on one server. 

The server has a solid state disk to hold mysql data. 

I believe that it can handle 3x-5x more traffic all by itself. However, I am thinking of ways
to scale up a mod_perl installation. 

1) Use a load balancer like perlbal (I am already doing that)
2) Separate a MySQL database server from webservers. 
3) Being enabled by item 2, add more webservers and balancers
4) Create a separate database for cookie data (Apache::Session objects) ??? -- not sure if
good idea --

(next level)

5) Use a separate database handle for readonly database requests (SELECT), as opposed to INSERTS
and UPDATEs. Use replication to access multiple slave servers for read only data, and only
access the master for INSERT and UPDATE and DELETE. 

Any thoughts?

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