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

["Ian Chesal" <ICHESAL@xxxxxxxxxx>]

I've also tried to disable hyperthread counting on our Dell servers by setting COUNT_HYPERTHREADED_CPUS=false and I can confirm that it DOES NOT work. I ended up disabling hyperthreading in the bios.

This is with the 6.7.x series. No clue if this works or not with 6.6.x builds.

- Ian

________________________________________
From: condor-users-bounces@xxxxxxxxxxx [mailto:condor-users-bounces@xxxxxxxxxxx] On Behalf Of Greg.Hitchen@xxxxxxxx
Sent: July 7, 2005 3:01 AM
To: condor-users@xxxxxxxxxxx
Subject: Re: [Condor-users] Can Condor create more than one VM on singleprocessor machines?


Normally my PC shows 2 VMs with half the total RAM. This is a PIV running WinXP and condor 6.6.10 
I've tried options 2), 3) and 4) and get: 
2) works and reports one machine with all RAM 
3) works and reports one vm1@ with half RAM 
4) doesn't seem to work, no change, i.e. still 2 VMs with half RAM each 
Any ideas why 4) isn't working? 
Cheers 
Greg 
*************************** From Matt Hope ***************************************************************** 
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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Greg Hitchen                                            greg.hitchen@xxxxxxxx 
CSIRO Exploration and Mining                            phone:+61 8 6436 8663 
Australian Resources Research Centre (ARRC)     fax:   ; +61 8 6436 8555 
Postal address:                                         mob:    0407 952 748 
PO Box 1130, Bentley WA 6102, Australia 
Street Address: 
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