[Openstack] HPC with Openstack?

Soren Hansen soren at linux2go.dk
Sun Dec 4 12:46:00 UTC 2011

2011/12/4 Lorin Hochstein <lorin at isi.edu>:
> Some of the LXC-related issues we've run into:
> - The CPU affinity issue on LXC you mention. Running LXC with OpenStack, you
> don't get proper "space sharing" out of the box, each instance actually sees
> all of the available CPUs. It's possible to restrict this, but that
> functionality doesn't seem to be exposed through libvirt, so it would have
> to be implemented in nova.

> - LXC doesn't currently support volume attachment through libvirt. We were
> able to implement a workaround by invoking "lxc-attach" inside of OpenStack
> instead  (e.g., see
> <https://github.com/usc-isi/nova/blob/hpc-testing/nova/virt/libvirt/connection.py#L482>.
> But to be able to use lxc-attach, we had to upgrade the Linux kernel in
> RHEL6.1 from 2.6.32 to 2.6.38. This kernel isn't supported by SGI, which
> means that we aren't able to load the SGI numa-related kernel modules.

Why not address these couple of issues in libvirt itself?

Soren Hansen        | http://linux2go.dk/
Ubuntu Developer    | http://www.ubuntu.com/
OpenStack Developer | http://www.openstack.org/

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