[THIN] Re: Full desktop for 900 users
- From: "Bernd Harzog" <Bernd.Harzog@xxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Wed, 27 Nov 2002 10:23:45 -0500
Let me point out some not so well known quirks of Task Manager. The
first is that if you add VM size as a column in Task Manager, that what
VM size actually reports is just page file usage (and not page file plus
RAM which is the true definition of VM). If you want to know the true
amount of Virtual Memory that a process is using you have to add the
values in the Mem Usage column to the values in the VM size column. If
you think that doing this is painful for each of the processes running
on the terminal server (and you are right that it is), and you want to
automate the process, send me an email. We have a utility that captures
those values and drops them into an Excel compatible spreadsheet. If you
want it, I will email it to you for free.
The second quirk extends not just to Task Manager but to many of the
underlying Perfmon metrics as well. This quirk is that the CPU
utilization numbers that are reported (in for example the CPU column in
Task Manager) do not include the time that the OS spends on Kernel Mode
operations. This is why you can sometimes have an unresponsive computer
(a desktop or a terminal server) and see low CPU utilization numbers.
What is happening in this case is that the OS is off in Kernel Mode
(doing something like reading and writing the page file), and that since
Kernel Model operations block user mode operations, nothing else can
happen while the computer is in this state.
Cheers,
Bernd Harzog
CEO
RTO Software
678-455-5506 x701
bernd@xxxxxxxxxxx
www.rtosoft.com
-----Original Message-----
From: Ron Oglesby [mailto:roglesby@xxxxxxxxxxxx]=20
Sent: Wednesday, November 27, 2002 9:31 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Full desktop for 900 users
Taskmgr mem usage doesn't tell the whole story. While the image may
report that much mem there is some sharing going on between sessions.
Depending on how many power users you were looking at etc. I would look
at 25-30 of the boxes.
That will give you some wiggle room for reboots and maintenance.
Ron Oglesby
Senior Technical Architect
=3D20
RapidApp
Office 312.372.7188
Mobile 312.961.2380
email roglesby@xxxxxxxxxxxx
=3D20
-----Original Message-----
From: Rowlandson, John [mailto:John.Rowlandson@xxxxxxxxxxxxx]=3D20
Sent: Wednesday, November 27, 2002 1:47 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Full desktop for 900 users
If you were building a farm for 900 concurrent users with a published
desktop as the primary method of access how many servers would you spec?
Dell 1655m dual p3 1.2 2gb ram , mirrored 73gb disk, dual 10/100/1000
nics.
I've done some sniffing on my current users
Applications and memory usage per user
Imanage 20-25mb
Word 2k 30-50mb
Excel 2k 15-30mb
Oracle Forms 20mb
Outlook 25-35mb
IE 15-20mb
Sundries (wfshell, explorer, winlogon, csrss) 10-15mb
Now if you add all this up you get 135-195mb per user.....
So if I did the maths of 150mb per user =3D3D3D not many people per box =
=3D
and
=3D3D
a
lot of blades...
I've started by saying 20 servers but am more inclined to look at 30?
Comments from the crowd?
john
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