[Building Sakai] Strange load testing results

[Steven Githens]

I find a lot of the time, my desktop machine is way faster, but often 
assumed it wasn't going over the network, and skipping a bunch of other 
real life infrastructure things.  Now that you mention, it would be a 
good thing to look into and quantify.

-s

Remi Saias wrote:
> Hello all,
>
> In the past weeks I have been performing some load tests on our 
> Sakai+OpenSyllabus server at HEC Montreal as we are planning to go 
> live for a pilot project in January.
>
> I used The Grinder which I found very efficient and easy to use, 
> considering that OpenSyllabus is strongly dependent on Ajax requests 
> and for this reason I could not use more classic tools relying on 
> defined pages with fixed URLs etc.
>
> I tested various configurations with a single scenario and was very 
> surprised to find out that our development laptops (regular laptops 
> with a CoreDuo under XP Pro) were running twice as fast as our linux 
> server which has 4 Xeon CPU at 2.8Ghz. In each case the database 
> server (mySQL 4 and 5, tested both) was running on the same machine.
>
> As I suspected something was incorrectly configured on the linux 
> server, I tried it at home on a less powerful linux box (Dual Core 
> 3Ghz vs Quad Xeon) and, surprise, I got a performance 4 times better. 
> I used the exact same set of sakai tools, sakai version and tomcat 
> version.
>
> I am still investigating this but I am starting to run out of ideas! I 
> have read confluence and added query caching (as per 
> http://confluence.sakaiproject.org/display/DOC/MySQL+Administration 
> <http://confluence.sakaiproject.org/display/DOC/MySQL+Administration>), 
> but it didn't change anything at all. I tried tweaking various mySQL 
> parameters without much impact!
>
> Does this ring a bell to someone!? I have not yet investigated the 
> server OS/hardware configuration (maybe the disk setup, raid or 
> such...) but I thought that it might be faster to simply ask! :-)
>
> BTW, Sakai 2.6.0 was 20% faster than 2.5.x in my tests.
>
> Thanks for any help!
> -- 
> Rémi Saïas
> Analyste en informatique - Technopédagogie
> Gestion des technologies de l'information - HEC Montréal
> Projet Sakai-OpenSyllabus: 514.340.6776 - Édifice Decelles: 4521 
>
>   
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