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

"Ian Chesal" <ICHESAL@xxxxxxxxxx> wrote:
>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.

Hi Ian -

Was this test also on windows?

I think this option works on Linux, but apparently not on Win32.


>- 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? 
>*************************** From Matt Hope ***************************************************************** 
>those machines have HyperThreading enabled. 
>suggestion - 
>1) get it switched off in the BIOS. 
>2) set NUM_CPUS = 1 
>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 
>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: 
>26 Dick Perry Avenue, Kensington WA 6151 
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