[torqueusers] Torque 3.0.3 and chroot environment

Kunal Rao kunalgrao at gmail.com
Thu Jun 7 10:50:34 MDT 2012

Hi David,

Thanks for your quick response and for pointing to the multi-mom feature.
The idea is similar i.e. make a small cluster look bigger with being as
realistic as possible.

I read through that page and seems like it will do what I want. I had a
follow up question on that :

- Does each mom read from /proc and report to the head node (pbs_server) ?
In that case the total cpus , memory, load etc. will be reported same from
each of them. Can that be isolated and different for each of them to mimic
  actual large cluster i.e. each having different number of cpus, memory,
load etc.


On Thu, Jun 7, 2012 at 12:16 PM, David Beer <dbeer at adaptivecomputing.com>wrote:

> Kunal,
> I have done a chroot environment with TORQUE - it worked fine. I was doing
> this for testing with sleep jobs, and the chroot was because I didn't want
> it to interact with anything else on the machine. I'm not sure what you're
> attempting to accomplish, but you may want to consider looking into the
> multi-mom feature (available starting in 3.0.0) that we also use a lot for
> testing. I have actually abandoned my chroot environment in favor of using
> the multi-moms.
> http://www.adaptivecomputing.com/resources/docs/torque/3-0-3/1.8multimom.php
> David
> On Thu, Jun 7, 2012 at 10:05 AM, Kunal Rao <kunalgrao at gmail.com> wrote:
>> Hi All,
>> Has anyone tried chroot environment for Torque 3.0.3 or later version ?
>> I'm thinking of having multiple chroot environment on the same system, each
>> representing a compute node and build a cluster.
>> So, even though there are say only 2 physical machines ( 1 server and 1
>> compute node), we should be able to make a cluster of say 4 nodes. Assuming
>> that the 1 physical compute node can have 3 chroot environment,
>> each having its own virtual IP and communicating with the master as 3
>> independent compute nodes. Head node / server will see as if there are 4
>> nodes and the scheduler will aallocate jobs accordingly.
>> Is this feasible and can work without any source code modifications to
>> pbs server  / pbs mom ?
>> Thanks,
>> Kunal
>> _______________________________________________
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>> torqueusers at supercluster.org
>> http://www.supercluster.org/mailman/listinfo/torqueusers
> --
> David Beer | Software Engineer
> Adaptive Computing
> _______________________________________________
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