RE: [Condor-users] Can Condor create more than one VM on singleprocessor machines?

["Miguel Dilaj" <mdilaj@xxxxxxxxxxxxx>]

Hi all,

Well... To be honest I don't think we have MANY SMP boxes. We need to power
of using many machines, but I don't particularly care about each CPU.
I think that my requirements will become:

     Requirements = ( (OpSys == "WINNT50") || (OpSys == "WINNT51") ) &&
(VirtualMachineID == 1)

and that should be enough.
Thanks for all the answers!

Miguel


-----Original Message-----
From: condor-users-bounces@xxxxxxxxxxx
[mailto:condor-users-bounces@xxxxxxxxxxx] On Behalf Of Matt Hope
Sent: 06 July 2005 17:19
To: Condor-Users Mail List
Subject: Re: [Condor-users] Can Condor create more than one VM on
singleprocessor machines?


On 7/6/05, Miguel Dilaj <mdilaj@xxxxxxxxxxxxx> wrote:
> 
> 
> Hi all,
> 
> I spotted vm1 and vm2 in a couple boxes, and according to IT there're 
> no dual-processor boxes there (but they can be mistaken).

Guess:

those machines have HyperThreading enabled.

suggestion - 
1) get it switched off in the BIOS.
2) set NUM_CPUS = 1 
3) set NUM_VIRTUAL_MACHINES = 1
4) set COUNT_HYPERTHREAD_CPUS = false

I suggest 4 as the cleanest while still let HT stay on but 1 as the safeest
(If you don't know about the HT state on a cluster you likely don't want it)

If instead you are luckyeenough to have some dual core machines then enjoy
having the additional cpu power witbhout the power tradeoffs. If network or
disk bandwidth is more important use option 3 to only have one vm per
machine

Matt

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