Honestly,
We need a scaling algorythm to calculate CPU power, RAM, HD
performance,
and HD size requirements per number of workstations just running X on the
clients and StarOffice/Netscape on the server.
Any mathematicians out there? This one is likely not so complex.
Unfortunately, I am very bad at math.
let c = Mhz of Athlon CPU of Server
let p = initial Mhz used including first client instance
let q = Mhz used by one client instance
let m = MB of RAM on Server
let r = rpms of disks on disk array
let s = number of disks striped on array
let n = number of X clients
let i = initial MB of RAM usage of RAM including first user instance
let u = MB of RAM usage by one user instance
let d = Mhz of CPU degredation per MB of swap disk space required
Therefore:
let D = (r*s) general performance of disk R/W access
let M = m-i+((n-1)*u) total memory usage in MB
let C = c-p+((n-1)*q) Total CPU usage discounting swap file effect
if M < m then C = C - (M*d)
In the end, C gives us how much CPU is left on the server.
Of course, I did not calculate system bus performance or memory
performance.
And some of these values will have to be averages. Obviously, getting
those
numbers will take a scientific experiment requiring lab facilities--but it
would be fun. Are there any other noticeable errors in the algorythm
above?
If we have these numbers, it would be simple enough to make a web-based
calculation utility for estimation of hardware requirements. The system
hardware would be subjective, being based on the system used as a server
in
the experiment and it also would not take into effect other overhead used
in
the case of Beowolf clusters, but nonetheless it would give a practical,
working level of knowledge for future deployment planning purposes. We
readilly know the rough differences of performance characteristics between
CPU types and memory types. Perhaps only system bus performance could
make a
difference unpredictable enough that it should be added into the
algorythm.
--Matthew
On Mon, 21 Jan 2002, Julius Szelagiewicz wrote:
> Juan Carlos,
> how is the load with 60? how much memory do you have in the
> server, how many processors, how fast? the real load now will tell you how
> much more memory / power you'll need for additional 140. good rule is to
> max out on memory in the server and to put multiple servers when you run
> out of steam. good luck, julius
>
> On Mon, 21 Jan 2002, Juan Carlos Zarta Escobar wrote:
>
> > Hello again
> >
> > There is my history
> >
> > In my company we start with 15 ws working with ltsp, this ammount its now
> > 60 workstation, but now the company need to work about 200 ws, each one
> > launchin netscape 4.7x in KDE2, Im not sure about the capacity of LTSP
> > you can help me please I want an answer for my company befor two weeks,
> > there is my actual network
> >
> >
> > ------------------- ---------------------
> > | applications | | LTSP |
> > | server | | Server |
> > | ip 192.168.0.41 | | ip 192.168.0.254 |
> > -------------------- ---------------------
> > | |
> > | |
> > ===========================================
> > |
> > |
> > |
> > ---------------------------------
> > | ws 01 -200 |
> > | ip 192.168.0.1 / 253 (not 41) |
> > ---------------------------------
> >
> > How can i do this ?? how many servers with LTSP i need ?? please help me
> > ,
> >
> > PD THANKS FOR YOUR HELP AND EXCUSE MY ENGLISH !!
> >
> > _____________________________________________________________________
> > Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
> > https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
> > For additional LTSP help, try #ltsp channel on irc.openprojects.net
> >
>
>
> _____________________________________________________________________
> Ltsp-discuss mailing list. To un-subscribe, or change prefs, goto:
> https://lists.sourceforge.net/lists/listinfo/ltsp-discuss
> For additional LTSP help, try #ltsp channel on irc.openprojects.net
>
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