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

["Kewley, J \(John\)" <j.kewley@xxxxxxxx>]

Surely Condor will still assume there are 2 processors sharing the memory.
If you have 1Gb memory, it will "split" this between the 2, and although I think
your jobs could probably run on VM1 and go over that, jobs with a memory requirement
of > 1/2 Mb would not get matched.

JK

> -----Original Message-----
> From: condor-users-bounces@xxxxxxxxxxx
> [mailto:condor-users-bounces@xxxxxxxxxxx]On Behalf Of Miguel Dilaj
> Sent: 06 July 2005 17:30
> To: 'Condor-Users Mail List'
> Subject: RE: [Condor-users] Can Condor create more than one VM
> onsingleprocessor machines?
> 
> 
> 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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