Re: [Condor-users] Can Condor create more than one VM on single processor machines?

[<Greg.Hitchen@xxxxxxxx>]

Title: Re: [Condor-users] Can Condor create more than one VM on single processor 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
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Postal address:                                         mob:    0407 952 748
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