[torqueusers] Disabling cpusets.

[Roy Dragseth]

On Thursday, November 03, 2011 23:09:28 Gareth.Williams at csiro.au wrote:
> > -----Original Message-----
> > From: Roy Dragseth [mailto:roy.dragseth at cc.uit.no]
> > Sent: Thursday, 3 November 2011 7:59 PM
> > To: torqueusers at supercluster.org
> > Subject: [torqueusers] Disabling cpusets.
> > 
> > Hi.
> > 
> > Is it possible to have cpusets compiled in, but disable it at runtime?
> > 
> > I did some code spelunking and couldn't find any way to turn it off.
> > Did I
> > overlook anything?
> > 
> > r.
> 
> Hi Roy,
> 
> You could (probably) manipulate the cpuset in the (privileged) job
> prologue.  This is relatively easy in the case where a job uses a single
> node but would be trickier for multi-node jobs.
> 

Thanks for all the replies.

My testing shows that if cpusets is enabled in torque and /dev/cpuset is not 
mounted on the node the job will go into an endless restart loop.  This is for 
torque 3.0.2.

Looking at the code it should be fairly easy to test if /dev/cpuset is mounted 
and disable the cpuset stuff in torque if it isn't.

The reason I'm asking is that I'm the maintainer of the torque-roll for the 
Rocks Cluster Distro and some of the users have requested if I could enable 
the cpusets in torque.  This is easy to do, but I'm worried that this could 
suddenly break a lot of stuff for other users not interested in this.  So 
having cpusets enabled in torque with the possibility to turn it off would be a 
nice thing to have.

Would anyone object to a patch for this?

r.