[THIN] Re: Citrix Performance - Processor Scheduling and Memory Usage
- From: Webster <webster@xxxxxxxxxxxxxxx>
- To: "thin@xxxxxxxxxxxxx" <thin@xxxxxxxxxxxxx>
- Date: Thu, 21 Jul 2011 11:15:48 +0000
David Solomon in his windows Internals class says to set it to Programs and he
says Mark R. says the same thing. If you think about it, Exchange, SQL, etc
runs lots of services and XenApp runs Programs (lots of them for lots of
users). I will go with what David S. and Mark R. say.
Thanks
Carl Webster
Consultant and Citrix Technology Professional
http://www.CarlWebster.com<http://www.carlwebster.com/> (check out the changes
coming to my website)
________________________________
From: thin-bounce@xxxxxxxxxxxxx [thin-bounce@xxxxxxxxxxxxx] on behalf of Andrew
Wood [andrew.wood@xxxxxxxxxxxxxxxx]
Sent: Thursday, July 21, 2011 4:38 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Citrix Performance - Processor Scheduling and Memory Usage
The thing to remember about optimal Citrix performance is that – there is no
one universal setting that will work for all environments every time: each
environment can be different – test it first. And, think through
effort-to-performance: you could spend weeks messing around with performance
stats and end up getting an extra 2% performance – but really, would your
punters notice? Still, gave me a chance to dust off this document from IBM on
Windows 2003 tuning. http://www.redbooks.ibm.com/redpapers/pdfs/redp3943.pdf
Anyhoo – there’s a useful document from Citrix:
Top 10 Items Found by Citrix Consulting on Assessments
(http://support.citrix.com/servlet/KbServlet/download/18928-102-19722/Top%2010%20Items%20Found%20by%20Citrix%20Consulting%20on%20Assessments%20v2.pdf)
Which in turn leads you to the Citrix Advanced Concepts guide(s):
http://support.citrix.com/article/ctx114746
In terms of that specific memory optimisation – I’ve always gone with setting
it to system cache (not programs) and “background tasks” (not programs)* -
which goes against some the generally excellent advice outlined here
http://www.citrixtools.net/Resources/Articles/articleType/ArticleView/articleID/36/Terminal-Server-XenApp-Tuning-Tips.aspx
Memory
The reg entry is LargeSystemCache
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory
Management LargeSystemCache = REG_DWORD: 1
This setting allocates additional memory to the File System Cache. From Windows
Server 2003, Microsoft moved the registry from Paged Pool RAM and into the File
System Cache. Running out of File System Cache will prevent users’ ntuser.dat
files (profiles) from loading.
http://smallvoid.com/article/winnt-system-cache.html
With the suggestion of having a looksee at
http://support.microsoft.com/kb/920739
Processor Usage
To be fair, if it was just terminal services/rds on its own, the better setting
would be “programs” – this is because this it sets the timeslice quantum to be
nice and short – everyone getting a better crack of the whip. But in XenApp you
can turn on funky CPU utilization management (other 3rd party CPU management
tools are available) in which case you should set it to background services
(otherwise you either get errors or the CPU utilization management doesn’t work
as effectively)
And here’s a nice article all about that -
http://www.jhouseconsulting.com/2008/05/13/processor-scheduling-20
hth
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of
Angela Smith
Sent: 21 July 2011 01:23
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Citrix Performance - Processor Scheduling and Memory Usage
I was hoping there would be a clear answer to this.. I remember years ago
reading about it and everyone had it set differently.. Hopefully someone can
provide "best practice" advice on what it should be set to for optimal Citrix
performance.
________________________________
From: rich@xxxxxxxxxxxxxxxxxx
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Citrix Performance - Processor Scheduling and Memory Usage
Date: Wed, 20 Jul 2011 16:40:58 -0400
Funny, I just a Citrix engineer tell me to set it to System Cache!
________________________________
From: Mark.Landin@xxxxxxxxxxxxxxxx
To: thin@xxxxxxxxxxxxx
Date: Wed, 20 Jul 2011 15:38:25 -0500
Subject: [THIN] Re: Citrix Performance - Processor Scheduling and Memory Usage
Memory Usage should be set to Applications (or whatever is NOT “System Cache”).
________________________________
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of
Angela Smith
Sent: Wednesday, July 20, 2011 5:21 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Citrix Performance - Processor Scheduling and Memory Usage
Hi
What is the correct setting for Citrix Performance. A default Windows 2003 R2
Server install defaults to:
Processor Scheduling
Programs
Memory Usage
System Cache
Is this OK or should I change it?
Thanks
Ang
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