[Openstack] Fwd: Mitaka: dashboard performance

Eugen Block eblock at nde.ag
Mon May 30 15:59:33 UTC 2016

Hi *,

we're running Openstack on top of Leap 42.1. Since switching to  
Mitaka, we're experiencing severe delays when accessing the dashboard  
- i.e. switching between "Compute - Overview" and "Compute -  
Instances" takes 15+ seconds, even after multiple invocations.

I've had a look at the requests, the Apache logs and our control  
node's stats and noticed that it's a single call that's taking all the  
time... I see no indications of any error, it seems that once WSGI is  
invoked, that call simply takes its time. Intermediate curl requests  
are logged, so I see it's doing its work. Looking at "vmstat" I can  
see that it's user space taking all the load (Apache / mod_wsgi drives  
its CPU to 100%, while other CPUs are idle - and no i/o wait, no  
system space etc.).

Current test, switching to "Overview" took 13.09 secs loading  
http://control1/project/. Switching back to "Instances" took 14.7 secs  
for http://control1/project/instances/. Ain't no fun using the  
dashboard that way... and we did not see this with previous releases.

Do others see the same slowness or is it likely some (system or  
Openstack) configuration issue on our side?

Just for reference, we're running the following version of Horizon:

--- cut here ---
control1:/etc/apache2/conf.d # rpm -qi  
Name        : openstack-dashboard
Version     : 9.0.1~a0~dev12
Release     : 2.1
Architecture: noarch
Install Date: Tue May 10 12:39:04 2016
Group       : Development/Languages/Python
Size        : 51400386
License     : Apache-2.0
Signature   : RSA/SHA256, Mon May  9 11:07:15 2016, Key ID 893a90dad85f9316
Source RPM  : openstack-dashboard-9.0.1~a0~dev12-2.1.src.rpm
Build Date  : Mon May  9 11:06:31 2016
Build Host  : build81
Relocations : (not relocatable)
Vendor      : obs://build.opensuse.org/Cloud:OpenStack
URL         : http://wiki.openstack.org/OpenStackDashboard
--- cut here ---


Eugen Block                             voice   : +49-40-559 51 75
NDE Netzdesign und -entwicklung AG      fax     : +49-40-559 51 77
Postfach 61 03 15
D-22423 Hamburg                         e-mail  : eblock at nde.ag

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