Re: [condor-users] Dynamically Changing Virtual Machine Settings

[Mark Silberstein <marks@xxxxxxxxxxxxxxxxxxxxxxx>]

The answer is no. The  VM abstraction for SMPs is problematic.

What you can do, though, you can write your own script, which does the
following:
1. Monitors the Condor queue for the presence of such jobs ( condor_q -g
-l )
2. If found, reconfigures and restarts the Condor on some node to
enforce it showing single vm ( the number of reconfigured nodes depends
on your policy )
3. When the job leaves the queue, restores the settings.
It is not hard to write such thing in perl and put it to be run by cron.
Hope this helps
Mark


On Thu, 2003-11-20 at 00:02, Jess Cannata wrote:
> I run a seven-node dual-processor Beowulf cluster running Condor 6.4 on 
> Linux. Each machine has1.5 GB of RAM.
> 
> The default virtual machine settings divides the physical RAM equally 
> between the two processors (755 MB, see below). This is fine for most 
> jobs. Unfortunately, I have a Parallel VASP job that will only run if 
> one of the two processors can access the full 1.5 GB of RAM. Is there 
> any way that I can dynamically/temporarily adjust the virtual machine 
> settings in order to allocate the full 1.5 GB of RAM to one of the 
> processors? I don't want the changes to be permamanent, nor do I want to 
> have to modify Condor's config files each time. Is it possible to 
> include these changes in a job submission file?
> 
> I've gone through the manual numerous times and I've searched the list. 
> How have other dual processor running Condor users dealt with this?
> 
> Thanks.
> 
> Jess
> 
> Here's a portion of my condor_status report:
> 
> vm1@xxxxxxxxx LINUX       INTEL  Unclaimed  Idle       0.000   755  
> 0+00:14:56
> vm2@xxxxxxxxx LINUX       INTEL  Unclaimed  Idle       0.000   755  
> 0+00:05:05
> vm1@xxxxxxxxx LINUX       INTEL  Unclaimed  Idle       0.040   755  
> 0+00:15:34
> vm2@xxxxxxxxx LINUX       INTEL  Unclaimed  Idle       0.000   755  
> 0+00:15:35
> 
> 
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