Open Stack

On Mon, 21 Jan 2013 15:48:52 -0500
David Kranz <david.kranz at qrclab.com> wrote:

> Attila, thanks for your comments. They are a lot to digest! I did
> have a particular comment about the performance issue and parallelism.
> I ran parallel nose jobs manually for the compute/servers and 
> compute/images tests and got only a little 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.

Chris
-- 
cyeoh at au.ibm.com