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

[OpenStack Infra]

Reviewed:  https://review.openstack.org/460441
Committed: https://git.openstack.org/cgit/openstack/charm-nova-cloud-controller/commit/?id=b699e56699ac174a75af1bd257dfa35132231e3f
Submitter: Jenkins
Branch:    master

commit b699e56699ac174a75af1bd257dfa35132231e3f
Author: James Page <james.page at ubuntu.com>
Date:   Thu Apr 27 09:28:27 2017 +0100

    Make worker-multiplier sane in container environments
    
    Resync charm-helpers to pickup the capped worker-multiplier
    changes when deploying in containers.
    
    Drop the default value for worker-multiplier of 2.0; this
    is now handled from within the codebase rather than via a
    default configuration value, reflecting the differing
    behaviours between container and non-container deployments.
    
    Change-Id: Iec5fa21b0e1b377bcb22ad5193c84aa0ae525f16
    Closes-Bug: 1665270


** Changed in: charm-nova-cloud-controller
       Status: Triaged => Fix Committed

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

Title:
  Lower number of workers by default

Status in OpenStack cinder charm:
  Fix Committed
Status in OpenStack glance charm:
  Fix Committed
Status in OpenStack heat charm:
  Fix Committed
Status in Charm Helpers:
  Fix Released
Status in OpenStack keystone charm:
  Fix Committed
Status in OpenStack neutron-api charm:
  Triaged
Status in OpenStack neutron-gateway charm:
  Triaged
Status in OpenStack nova-cloud-controller charm:
  Fix Committed
Status in cinder package in Juju Charms Collection:
  Invalid
Status in glance package in Juju Charms Collection:
  Invalid
Status in heat package in Juju Charms Collection:
  Invalid
Status in keystone package in Juju Charms Collection:
  Invalid
Status in neutron-api package in Juju Charms Collection:
  Invalid
Status in neutron-gateway package in Juju Charms Collection:
  Invalid
Status in nova-cloud-controller package in Juju Charms Collection:
  Invalid

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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