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[melanie witt <2012979@xxxxxxxxxxxxxxxxxx>]

This is unfortunately a known issue and is not an issue in Nova but
rather is an issue related to the python-openstackclient.

There are a couple of CLI options that can be passed to improve
performance:

  * --no-name-lookup (which you already found)

or

  * --name-lookup-one-by-one (this will lookup only related images as
you mention)


I have long thought the second option should be the default behavior but in the past there was some pushback about changing it. It might be worth checking again whether the python-openstackclient project might be open to accepting such a change now. They use the following bug tracker:

  https://storyboard.openstack.org/#!/project/openstack/python-
openstackclient


I'm going to mark this as Invalid for Nova and then add Horizon because maybe they could update their internal call to use one of the above options when they call openstackclient to improve the UX.

[1] https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/server.html#cmdoption-openstack-server-list-n
[2] https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/server.html#cmdoption-openstack-server-list-name-lookup-one-by-one

** Changed in: nova
       Status: New => Invalid

** Also affects: horizon
   Importance: Undecided
       Status: New

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/2012979

Title:
  Server list in both dashboard and command line takes a long time with
  many images

Status in OpenStack Dashboard (Horizon):
  New
Status in OpenStack Compute (nova):
  Invalid

Bug description:
  First, please pardon me if this has already been dealt with in newer
  releases. Our OpenStack is Train.

  Our environment has thousands of images including snapshots.

  When listing instances, both by command line and in the dashboard, the
  instance list takes quite a while and apparently goes through all
  images in the background. Please see the attached text file for an
  example, a project with five instances taking over 21 seconds to list
  the instances.

  In contrast, using '-n' in the command will list those same instances
  in less than a second. Of course, the dashboard has no such option.

  If feasible, can Nova only pull the images related to the instances
  rather than pulling every single image in the Glance repository?

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