[condor-users] How to configure more Condor VMs than actual CPUs?

[Angel de Vicente <angelv@xxxxxxxxx>]

Hi,

I'm reading the document on the Bologna Batch Service
(http://www.cs.wisc.edu/~pfc/bologna_batch_system.html) and I have come accross
something that is really interesting for us, but that I do not know how to set
up.

Regarding their policy #6 "A short-running Bologna Batch Job must not be force
to wait for the completion of a long-running Bologna Batch Job before starting",
they say:

"To avoid this, we configured more total Condor VMs on Bologna Batch Servers
than there are actual CPUs.

For example, on a dual-CPU server we configured six Condor VMs, [...] and on a
single-CPU server we configured two Condor VMs [...]"

How can you do that? In a single CPU machine I've tried two things and obtained
two types of errors:


1) Just setting NUM_VIRTUAL_MACHINES = 2 

5/21 12:41:32 ERROR: Can't allocate 2nd virtual machine of type 0
        Requesting: Cpus: 1, Memory: 500, Swap: 100.00%, Disk: 100.00%
        Available:  Cpus: 0, Memory: 0, Swap: 0.00%, Disk: 0.00%
5/21 12:41:32 ERROR "Ran out of system resources" at line 361 in file ResMgr.C




2) Defining VIRTUAL_MACHINE_TYPE_1 = 50%
            NUM_VIRTUAL_MACHINES_TYPE_1 = 2


5/21 12:53:08 ERROR: Can't allocate 2nd virtual machine of type 1
        Requesting: Cpus: 1, Memory: 250, Swap: 50.00%, Disk: 50.00%
        Available:  Cpus: 0, Memory: 250, Swap: 50.00%, Disk: 50.00%
5/21 12:53:08 ERROR "Ran out of system resources" at line 361 in file ResMgr.C



Any help?

Thanks,
Angel de Vicente
-- 
----------------------------------
http://www.iac.es/galeria/angelv/

PostDoc Software Support
Instituto de Astrofisica de Canarias

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