[Building Sakai] Forums, Blog Wow and Wiki uselessly slow

[Berg, Alan]

Hi all,

I am suspicious of XX:MaxPermSize=256m. If we do that on qa1-nl, then sometimes we run out of perm space. How about MaxPermSize=512m
Further we find that our Sun/Solaris T2000 servers are very strong for Java applications because the CPU's are optimised for integer work and lots of threads. However, we are also moving  services slowly to Vmware for consolidation reasons.

Our uPortal environment is on VMware, the minor gotcha is that we run Linux on top and that each thread costs 2MB extra of native memory.

Alan

Alan Berg
Interim QA Director - The Sakai Foundation

Senior Developer / Quality Assurance
Group Education and Research Services
Central Computer Services
University of Amsterdam

http://home.uva.nl/a.m.berg




-----Original Message-----
From: sakai-dev-bounces at collab.sakaiproject.org on behalf of Gerwood Stewart
Sent: Thu 3/25/2010 23:05
To: sakai-dev at collab.sakaiproject.org
Subject: Re: [Building Sakai] Forums, Blog Wow and Wiki uselessly slow
 
Thanks for the reply Matt

We already running on x86. Though you did remind me that we are running on VMWare ESX.

We are running Oracle 10g RAC and the DBAs believe that it's not struggling. They have identified slow queries that could contribute and we've added indexes where possible, but it still seems somewhat illogical to be running that slow in those tools, general navigation is quite quick as well.

These are our Java opts (that I think apply), this is per node:
-ms3072m -mx3072m -XX:NewSize=128m -XX:MaxNewSize=128m -XX:SurvivorRatio=4 -XX:TargetSurvivorRatio=90 -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+CMSIncrementalPacing -XX:+CMSParallelRemarkEnabled -XX:+UseParNewGC -XX:PermSize=256m -XX:MaxPermSize=256m -XX:+UseTLAB -XX:+CMSClassUnloadingEnabled -XX:+CMSClassUnloadingEnabled -XX:CodeCacheMinimumFreeSpace=2M -XX:ReservedCodeCacheSize=64M -XX:MaxTenuringThreshold=10

Gerwood

From: mizematr at notes.udayton.edu [mailto:mizematr at notes.udayton.edu]
Sent: Friday, 26 March 2010 12:00 AM
To: Stephen Marquard
Cc: Gerwood Stewart; sakai-dev at collab.sakaiproject.org; sakai-dev-bounces at collab.sakaiproject.org
Subject: Re: [Building Sakai] Forums, Blog Wow and Wiki uselessly slow


Gerwood,

We recently overcame a slowness across the board issue that was related to the hardware.  Our application server was running on a Sun UltraSparc T-Series architecture, which must not be compatible with Java threads.  We ran some benchmarks on various architectures and they showed using x86 was the best way to go.  We made the switch about three weeks ago and saw a 40-60% performance increase across the board.
---------------------------------------------------------------------------
Matt Mize, Systems Administrator
- Pay no attention to the man in the back office....
Matt.Mize at notes.udayton.edu
(937) 229-1024

UDit Department, University of Dayton
300 College Park, Dayton, OH, 45469-1302

"Stephen Marquard" <stephen.marquard at uct.ac.za>
Sent by: sakai-dev-bounces at collab.sakaiproject.org

03/25/10 01:44 AM

To

"sakai-dev at collab.sakaiproject.org" <sakai-dev at collab.sakaiproject.org>, "Gerwood Stewart" <gstewar8 at une.edu.au>

cc

Subject

Re: [Building Sakai] Forums, Blog Wow and Wiki uselessly slow







Hi Gerwood,

That sounds odd. Forums has some slowdown with large numbers of posts in a topic, but we've never seen any speed issues at all with blogwow or wiki.

I would look at database performance firstly (perhaps missing indexes?) and secondly at your JVM memory options (available memory, GC times, etc.).

Regards
Stephen

>>> Gerwood Stewart <gstewar8 at une.edu.au> 3/25/2010 6:01 AM >>>
We are having a lot of issues with the speed (and thus usability) of the Forums, Blog Wow and Wiki tools.

It's bad enough that I don't believe most institutions using Sakai would be seeing similar results.

Does anyone know of what issues we might be encountering?

We are running on RHE boxes with an Oracle 10g backend.

Help would be greatly appreciated.

Thanks
Gerwood Stewart




______________________________________________________________________________________________

UNIVERSITY OF CAPE TOWN

This e-mail is subject to the UCT ICT policies and e-mail disclaimer published on our website at http://www.uct.ac.za/about/policies/emaildisclaimer/ or obtainable from +27 21 650 4500. This e-mail is intended only for the person(s) to whom it is addressed. If the e-mail has reached you in error, please notify the author. If you are not the intended recipient of the e-mail you may not use, disclose, copy, redirect or print the content. If this e-mail is not related to the business of UCT it is sent by the sender in the sender's individual capacity.

_____________________________________________________________________________________________________

_______________________________________________
sakai-dev mailing list
sakai-dev at collab.sakaiproject.org
<http://www.uct.ac.za/about/policies/emaildisclaimer/>http://collab.sakaiproject.org/mailman/listinfo/sakai-dev

TO UNSUBSCRIBE: send email to sakai-dev-unsubscribe at collab.sakaiproject.org with a subject of "unsubscribe"
<http://collab.sakaiproject.org/mailman/listinfo/sakai-dev>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://collab.sakaiproject.org/pipermail/sakai-dev/attachments/20100326/1221b777/attachment.html