Open Stack

On Tue, 22 Jan 2013 09:37:38 -0500
David Kranz <david.kranz at qrclab.com> wrote:

> On 1/22/2013 6:44 AM, Christopher Yeoh wrote:
> > On Mon, 21 Jan 2013 15:48:52 -0500
> > David Kranz <david.kranz at qrclab.com> wrote:
> >

> >> more than 1/2 the speedup that should be
> >> available theoretically. This was on a real machine with 24 "cpus"
> >> running devstack. I believe most of the problem is due to
> >> https://bugs.launchpad.net/nova/+bug/1016633 which limits the
> >> speedup of parallel instance creation on a single server to half
> >> what it could be.
> > FWIW I see this too. Running the tempest tests with testr --parallel
> > with 4 cpus I get about a 2x speed up. However with tests for most
> > people taking around 30-90 minutes to run serially its quite
> > valuable for developers wanting to run them regularly.
> >
> I was not sneering at 2x speedup! But that is a limitation we
> currently face and I wanted to make sure every one knew it.

yes, I just meant to confirm that I too had seen the same
performance problem. And thank you for explaining the cause of it - I
had no idea and it was on my list of things to investigate :-)

Regards,

Chris
-- 
cyeoh at au.ibm.com