[K12OSN] Relative performance characteristics

["Terrell Prudé Jr."]

That is indeed interesting.  And with this setup, you're not seeing a
bunch of swapping to disk?

--TP
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Nadav Kavalerchik wrote:
> KDE + Opera / Konqueror + OpenOffice (some times Firefox 2)
>  we have issues with Firefox rendering hebrew sites correctly :-(   
>
> when KOffice supports the RTL languages better (hebrew) , i think
> we'll switch to that too.
> they all share the same QT libs, thus using less memory,in general.
>
> when measuring ram with the FL_TeacherTool ( which is not reflecting
> the memory use correctly)
> we get (per user) 100MB for plain KDE desktop + 30MB for Opera + 50MB
> Open Office (+60 Firefox 2)
> but actually the more users are logged in it uses less per user
> because the app's CODE is in memory and it only allocate DATA space
> (the TeacherTool reports all the memory owned by the user)
>
> ( and games, edu apps, drawing, java science... )
>
> + 500MB goes to squid (web proxy) which make a big difference !!!
>
> Nadav :-)
> (Bless Eric)
>
> On 1/9/07, *"Terrell Prudé Jr."* < microman at cmosnetworks.com
> <mailto:microman at cmosnetworks.com>> wrote:
>
>     With that amount of DRAM, I'd be interested to know which desktop
>     you have your users on, and which apps they use.  Also, do they
>     all use the same desktop?
>
>     --TP
>
>
>     Nadav Kavalerchik wrote:
>>     we use (intel 830 model - pentium 4 ) 3.2 GHz with 2 GB RAM to
>>     serve 25 clients
>>
>>     On 1/8/07, *"Terrell Prudé Jr."* < microman at cmosnetworks.com
>>     <mailto:microman at cmosnetworks.com>> wrote:
>>
>>         Sounds like your issue is DRAM.  Depending on the apps
>>         running (e. g. TuxType), it could also be server bandwidth,
>>         but from what you describe, it sounds like you're starting to
>>         swap to disk once you hit 60 clients.  That will definitely
>>         slow any kind of terminal server, including LTSP servers, to
>>         a crawl.  You might not have any DRAM hogs, but if you've got
>>         a bunch of instances of an app running, all using a certain
>>         amount of DRAM, that adds up.  For that reason, I normally
>>         didn't push my servers, which generally have 4GB DRAM, past
>>         30 clients.  Since you're only at 65% CPU usage, it really
>>         doesn't sound like that's your problem.  Also, make sure that
>>         you are indeed checking that *all* of your server's CPUs are
>>         seeing only 65% usage.  By default, top shows only an average
>>         between all of them.
>>
>>         --TP
>>         _______________________________
>>         Do you GNU!?
>>         Microsoft Free since 2003 <http://www.gnu.org/>--the ultimate
>>         antivirus protection!
>>
>>
>>         Immanuel Derks wrote:
>>>         Hi all,
>>>
>>>         Just wondering at the moment how people feel about the difference in
>>>         performance characteristics between the latest Xeon core duo breed
>>>         processors and the old fashioned dual Xeon server layouts for LTSP.
>>>
>>>
>>>
>>>         We have multiple IBM X235/x236 with double Xeon 3GHz processors
>>>         outfitted for a failover LTPS configuration at our school (80-100
>>>         clients) and are wondering whether we can simplify the configuration by
>>>
>>>         making use of a single server with double Xeon dual core processors (say
>>>
>>>         an X3650 that comes with 2 dual-core Xeon 2.33/2.66 or 3.0GHz)
>>>
>>>         Can anybody testify a configuration with similar loads who made such a
>>>
>>>         swap? I know dual core processors don't have a similar performance as 2
>>>
>>>         separate xeons at the same speed, but one might wonder with all the
>>>         threaded apps en memory use in LTSP, that it could stack up to it...
>>>
>>>
>>>         I must say I feel a bit skeptical sometimes at the performances quotas
>>>
>>>         that I sometimes see here on the list, since we noticed (even on our
>>>         glass backbone) that x236 servers with 3GHz processors and 8GB ram
>>>
>>>         fitted are really dropping performance to a slow when 60 people login (2
>>>
>>>         classes) and start working on office and firefox stuff at the same time.
>>>         That's why we needed 2 similar servers and we are doing fine now.
>>>
>>>         As soon as the CPU loads get over the 65% peak loads, we get a real drop
>>>
>>>         in performance, but no iowait or memory hogs or anything....
>>>         (we basically run standard RedHat 4 edu edition)
>>>
>>>         Kind regards,
>>>
>>>
>>>         Immanuel Derks
>>>
>>>               
>>
>
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