[NBLUG/talk] thought I'd ask here also - Anyone have any experience with LTSP?

[Omar Eljumaily]

I was wrong about hardware rendering.  That wouldn't be a bottleneck 
since it doesn't do GPU rendering.  Any software rendering bottleneck 
would likely show up in CPU and memory usage.

http://superuser.com/questions/836821/can-an-ltsp-server-use-a-gpu-for-client-rendering


On 1/23/2015 5:49 PM, gandalf at sonic.net wrote:
> Hmmm, top says it's been up 25 days.
>
> On 2015-01-23 17:46, Zack Gold wrote:
>> RX bytes:592148079085 (592.1 GB)  TX bytes:3887567471905 (3.8 TB)
>>
>> Holy smokes, Gandalf!
>> On Jan 23, 2015 7:37 PM, <gandalf at sonic.net> wrote:
>>
>>> As I understand it everything is run from the server and the
>>> x.window video is simply sent to the client. It's rather like
>>> running a bunch of remote sessions such as with VNC. It's designed
>>> for use on low budget devices and old systems, 400mhz or so. I'm
>>> sure if I could offload some of that from the sever to the client
>>> the issues would disappear.
>>>
>>> On 2015-01-23 16:17, Omar Eljumaily wrote:
>>> I thought about this a bit more.  I think that it could any of
>>> several different non-CPU, non-Memory resource issues including:
>>>
>>>  1. Display rendering if it's using hardware (graphics card) to
>>> render.
>>>  2. Disk IO
>>>  3. Network IO
>>>  4. Network bandwidth.
>>>  5. Others???
>>>
>>> On 1/23/2015 4:11 PM, Steve S. wrote:
>>>
>>> Just a sudden thought... might a NIC be mis-set to a slow speed,
>>> causing all sorts of funky backups, mis-queueing,
>>> context-switching,
>>> etc...?
>>>
>>> On Fri, Jan 23, 2015 at 4:00 PM, Jordan Erickson
>>> <jerickson at logicalnetworking.net> wrote:
>>>
>>> Can you give us a bit more detail as to your network/server setup?
>>> You
>>> say you're running 24cpus and 128gigs. Might be a logical
>>> explanation to
>>> house NFS on its own server.. What's your network speed? Thin (or
>>> fat)
>>> client specs? Distro?
>>>
>>> Cheers,
>>> Jordan
>>>
>>> On 01/23/2015 03:52 PM, gandalf at sonic.net wrote:
>>> It's actually a NFS to a separate server. I'm not sure why it
>>> was done
>>> that way. To me this would probably further congest the network
>>> while
>>> not being nearly as fast as a high performance direct disk
>>> interface.
>>>
>>> On 2015-01-23 15:00, Omar Eljumaily wrote:
>>> Not speaking from experience with LTSP server, but my guess
>>  would be
>>
>>>> that it is a disk io bottleneck.
>>
>>
>> http://stackoverflow.com/questions/21617500/understanding-load-average-vs-cpu-usage 
>>
>> [2]
>>
>>> [1]
>>>
>>> I believe that web browsers cache on disk most of their
>>  content and
>>
>>>> media before rendering it.  That's a lot of users hitting a
>>  single
>>
>>> disk drive or array.  Do you have a large RAID array?  SSD?
>>>
>>> Omar
>>>
>>> On 1/23/2015 2:19 PM, gandalf at sonic.net wrote:
>>>
>>> I'm seeing very high load averages with low CPU usage. The
>>  two main
>>
>>> culprits are chrome and firefox. I've got about a hundred
>>  users
>>
>>> sharing the LTSP server which has some rich resources (24cpus
>>  and
>>
>>> 128gigs).
>>>
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