[K12OSN] bottleneck question

[Liam Marshall]

Les Mikesell wrote:

>On Wed, 2004-09-08 at 13:54, Liam Marshall wrote:
>  
>
>>It is the first day of school, so of course I have discovered a
>>problem.  Running K12LTSP server and 31 thin clients.  All are able to
>>connect, but after attempting to all surf with Mozilla at the same time
>>it slowed down seriously
>>    
>>
>
>If it only happens with Mozilla, it may be internet bandwidth instead
>of a local problem.  Or if there are a lot of animated graphics it
>could be server bandwidth toward the clients.
>
>  
>
It happens in Mozilla, games, and any of the openoffice apps.  At one 
point, with everyone going into Writer, free memory was down to less 
than 5% of the total.  Once everyone finally gets into Writer, then the 
cpu total usage goes down to 40 to 50 % but the used memory  stays very high

>>ran top on server, which has hyperthreading single cpu 3.06 MHz and 2 GB
>>RAM.  cpu usage total says 152% with roughly 70% on cpu01 and 80 % on
>>cpu00
>>
>>memory free down to 400 MB.
>>
>>There is not much I can do immediately about the cpu.  I can increase
>>the memory to 4GB if I new that would help
>>    
>>
>
>You can't tell much from the 'free' memory because additional memory
>will be used as buffers.
>
>  
>
>>will it, or will the cpu usage still be really high, which according to
>>top is the killer?
>>    
>>
>
>If you are using a substantial amount of swap (see top) or it is
>very active (do a 'vmstat 5' and watch when the system is busy)
>then adding memory will help a lot.  If normal activity doesn't
>use swap, adding RAM will still help but won't make a big difference.
>  
>

How much is alot?  After everyone was in the app texteditor, cpu usage 
was 39% , free memory was 130 MB out of 2 GB, and vmstat 5 revealed  
over 60 Mb used in cache, I think

>---
>  Les Mikesell
>   les at futuresource.com
>
>
>
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>  
>