[THIN] Re: Hyperthreading

  • From: "BRUTON, Malcolm, FM" <Malcolm.BRUTON@xxxxxxxx>
  • To: "'thin@xxxxxxxxxxxxx'" <thin@xxxxxxxxxxxxx>
  • Date: Fri, 1 Oct 2004 10:30:00 +0100

So after all the discussions and the reading all the docs seem to say that
it will work with Windows 2000.  Do most people turn if off for win2K or
leave it on?  Do people think it is a good practice to disable for Win2K
systems?  What about for win2003?  Turn it on???

Thanks
Malcolm

-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Nick Smith
Sent: 01 October 2004 09:06
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Hyperthreading

I have similar, but I'm inclined to think that it's just Sage, as I've
had the same happen on a non-HT processor. Sage is a pig, I hate it more
and more.
Nick 

-----Original Message-----
From: Dogers [mailto:dogers@xxxxxxxxx] 
Sent: 30 September 2004 23:33
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Hyperthreading

On Thu, 30 Sep 2004 12:18:07 -0400, Bernd Harzog
<bernd.harzog@xxxxxxxxxxx> wrote:

> Well what we discovered is that when a process is running on one of
the virtual CPU's (2 or 3) and goes rogue, it shuts down the whole
server. So, if something uses 25% of CPU (all of CPU 2 or 3) doing this
on a virtual CPU on Windows 2000 somehow clogs up the entire system. So,
our recommendations were; 1) don't use hyperthreading on Windows 2000,
and if you insist upon turning it on, don't use Affinity to assign any
processes to the virtual CPU's (only assign processes to the physical
ones).
> 
> I would be interested in knowing if anyone else has seen anything like
this. If you have, and you could share with the list that would be most
useful.

YES! This sounds exactly like what we get, but only on win2003!
Specifically in Sage Line 50 - it has functions which chew up 25% of a
CPU (cant remember right now which one though..!) and the whole server
comes to its knees for all users until the functions are stopped. I want
to try and disable HT to test and see if its that thats actually doing
it, but its our sole server, so is a little difficult :(

Andrew
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