[Openstack-operators] nova-placement-api tuning

Jay Pipes jaypipes at gmail.com
Tue Apr 3 13:33:05 UTC 2018

On 04/03/2018 06:48 AM, Chris Dent wrote:
> On Mon, 2 Apr 2018, Alex Schultz wrote:
>> So this is/was valid. A few years back there was some perf tests done
>> with various combinations of process/threads and for Keystone it was
>> determined that threads should be 1 while you should adjust the
>> process count (hence the bug). Now I guess the question is for every
>> service what is the optimal configuration but I'm not sure there's
>> anyone who's looking at this in the upstream for all the services.  In
>> the puppet modules for consistency we applied a similar concept for
>> all the services when they are deployed under apache.  It can be tuned
>> as needed for each service but I don't think we have any great
>> examples of perf numbers. It's really a YMMV thing. We ship a basic
>> default that isn't crazy, but it's probably not optimal either.
> Do you happen to recall if the trouble with keystone and threaded
> web servers had anything to do with eventlet? Support for the
> eventlet-based server was removed from keystone in Newton.

IIRC, it had something to do with the way the keystoneauth middleware 
interacted with memcache... not sure if this is still valid any more 
though. Probably worth re-checking the performance.


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