[Bug 1665270] Re: Lower number of workers by default

[Felipe Reyes]

Another option could be allow this config option to be more than just a
multiplier, so you could set a fixed number of threads for instance.

Possible values:

- FLOAT, behaves as it does today
- INTw , fixed number of workers
- INTw,FLOAT,INTw , this would be <minimum number of workers>,<multiplier for the cpus>,<maximum number of workers>, with this we'll have the chance to say "I want a minimum of 4 workers, but if there are 'lots' of core go ahead an used them without going over 12 workers". In the context of bundles and non homogeneous hardware would be helpful.

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https://bugs.launchpad.net/bugs/1665270

Title:
  Lower number of workers by default

Status in Charm Helpers:
  New
Status in cinder package in Juju Charms Collection:
  New
Status in glance package in Juju Charms Collection:
  New
Status in heat package in Juju Charms Collection:
  New
Status in keystone package in Juju Charms Collection:
  New
Status in neutron-api package in Juju Charms Collection:
  New
Status in neutron-gateway package in Juju Charms Collection:
  New
Status in nova-cloud-controller package in Juju Charms Collection:
  New

Bug description:
  On containerized setups with multiple cpus and hyperthreading on the
  metals the containers can see a large number of cores. With the
  default worker multiplier settings this eg. results in 112 workers
  plus a leader processes on one of our installs. With HA we have then
  3x113 processes serving in total, which is a bit of a waste (3x16G of
  RSS for one service, as an example)

  While this can be tuned down I'd suggest to cap the number of workers
  when the worker-multiplier setting is on default to make this more
  sensible out of the box

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