yahoo-eng-team team mailing list archive

[Andrei Tira <1979662@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Horizon is very slow in the morning after the 6:35 reload for the log
rotation.

We have a deployment with juju and MAAS of OpenStack Train with 3 units of horizon and we noticed that in the first hour after the apache log rotates it is very slow, this means:
Instances tab 41 sec (normally around 10 sec)
Networks tab 27 sec (normally around 4 sec)
Routers tab 23 sec (normally around 3 sec)
Volumes tab 33 sec (normally around 9 sec)

We did some profiling with OSprofiler on the horizon pages and saw that
the differences are at these functions:

Instances tab:
openstack_dashboard.api.nova.server_list_paged	horizon
openstack_dashboard.api.nova.extension_supported	horizon

The rest of the tabs:
openstack_dashboard.api.nova.extension_supported	horizon

Initially, we thought that this is from the number of workers and we
changed them from 56 to 8 but this did not change anything. In the logs,
there are no error messages or anything that would help us debug this
issue.

We don't know exactly from where these stems but we suspect that it has
something to do with the WSGI module

** Affects: horizon
     Importance: Undecided
         Status: New

** Attachment added: "Screenshots from the profiles we took"
   https://bugs.launchpad.net/bugs/1979662/+attachment/5599254/+files/Instances_tab.PNG

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https://bugs.launchpad.net/bugs/1979662

Title:
  Horizon is very slow in the first hour after the 6:35 morning log
  reload

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  Horizon is very slow in the morning after the 6:35 reload for the log
  rotation.

  We have a deployment with juju and MAAS of OpenStack Train with 3 units of horizon and we noticed that in the first hour after the apache log rotates it is very slow, this means:
  Instances tab 41 sec (normally around 10 sec)
  Networks tab 27 sec (normally around 4 sec)
  Routers tab 23 sec (normally around 3 sec)
  Volumes tab 33 sec (normally around 9 sec)

  We did some profiling with OSprofiler on the horizon pages and saw
  that the differences are at these functions:

  Instances tab:
  openstack_dashboard.api.nova.server_list_paged	horizon
  openstack_dashboard.api.nova.extension_supported	horizon

  The rest of the tabs:
  openstack_dashboard.api.nova.extension_supported	horizon

  Initially, we thought that this is from the number of workers and we
  changed them from 56 to 8 but this did not change anything. In the
  logs, there are no error messages or anything that would help us debug
  this issue.

  We don't know exactly from where these stems but we suspect that it
  has something to do with the WSGI module

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