[openstack-dev] [horizon] Fetch resources in parallel

Ivan Kolodyazhny e0ne at e0ne.info
Tue Oct 31 21:06:55 UTC 2017

Just forgot to mention one other option: we can use celery [6] too but I
didn't do any performance testing with it. This solution will be more

[6] http://www.celeryproject.org/

Ivan Kolodyazhny,

On Tue, Oct 31, 2017 at 7:15 PM, Ivan Kolodyazhny <e0ne at e0ne.info> wrote:

> Hi team,
> We all know that unfortunately Horizon's performance not good enough in
> some cases. That's why we try to fix it on both sides: client-side and
> server-side.
> I would like to talk mostly about server-side now. On some views, we use
> 'futurist' library [1] to fetch resources from API's in parallel. I've
> filed a blueprint for this effort [2]. You can find some work in progress
> patches in the Gerrit.
> For now, we use futurist.ThreadPoolExecutor in Horizon to fetch resources
> from APIs. It requires some specific Apache configuration changes to allow
> WSGI app to create threads. It means, our code execution depends on Apache
> mod_wsgi configuration.
> To avoid this, we can use futurist.GreenThreadPoolExecutor. It
> uses eventlet green threads which can be used to speed-up I/O operations
> like 'call external API'.
> I did very simple performance testing [3] with proposed patch [4] for
> volumes views. My tests are not ideal but you can see how it's going with
> green thread. I propose to switch to the futurist.GreenThreadPoolExecutor
> and add 'eventlet.monkey_patch()' call to the wsgi app for Horizon. It will
> speed up parallel API calls and make Horizon independent on Apache or other
> web server configuration.
> I added this topic to the next weekly meeting agenda [5] so we can discuss
> it there too.
> [1] https://github.com/openstack/futurist/
> [2] https://blueprints.launchpad.net/horizon/+spec/
> fetch-resources-in-parallel
> [3] https://docs.google.com/spreadsheets/d/14zDpdkPUfGDR_
> ZycaGUoT64kHsGi1gL9JOha8n5PVeg/edit?usp=sharing
> [4] https://review.openstack.org/#/c/426493/
> [5] https://wiki.openstack.org/wiki/Meetings/Horizon#
> Agenda_for_Next_Meeting
> Regards,
> Ivan Kolodyazhny,
> http://blog.e0ne.info/
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