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[Ian Watson <2117701@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Currently nova's compute/manager.py will perform a periodic update for
every instance in its update_available_resource method.

The current implementation has several inefficiencies that can be
squashed leading to less API calls/messages and a faster loop iteration.

The general issue is we are iterating over nodes regardless of whether
we need too or not. We only need to iterate over all the nodes if we a
reshape is required and the current node if the provider_tree was
updated.

https://github.com/openstack/nova/blob/master/nova/compute/resource_tracker.py#L1390

Instead we should make use of the driver_reshape variable 
https://github.com/openstack/nova/blob/master/nova/compute/resource_tracker.py#L1329

in addition to whether the provider_tree has changed to decide whether
to iterate over the node.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2117701

Title:
  Nova speed up for periodic update_available_resource

Status in OpenStack Compute (nova):
  New

Bug description:
  Currently nova's compute/manager.py will perform a periodic update for
  every instance in its update_available_resource method.

  The current implementation has several inefficiencies that can be
  squashed leading to less API calls/messages and a faster loop
  iteration.

  The general issue is we are iterating over nodes regardless of whether
  we need too or not. We only need to iterate over all the nodes if we a
  reshape is required and the current node if the provider_tree was
  updated.

  https://github.com/openstack/nova/blob/master/nova/compute/resource_tracker.py#L1390

  Instead we should make use of the driver_reshape variable 
  https://github.com/openstack/nova/blob/master/nova/compute/resource_tracker.py#L1329

  in addition to whether the provider_tree has changed to decide whether
  to iterate over the node.

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