[openstack-dev] [Nova][Scheduler] Policy Based Scheduler and Solver Scheduler

Khanh-Toan Tran khanh-toan.tran at cloudwatt.com
Thu Jan 30 09:14:34 UTC 2014

There is an unexpected line break in the middle of the link, so I post it


> -----Message d'origine-----
> De : Khanh-Toan Tran [mailto:khanh-toan.tran at cloudwatt.com]
> Envoyé : mercredi 29 janvier 2014 13:25
> À : 'OpenStack Development Mailing List (not for usage questions)'
> Objet : [openstack-dev] [Nova][Scheduler] Policy Based Scheduler and
> Scheduler
> Dear all,
> As promised in the Scheduler/Gantt meeting, here is our analysis on the
> connection between Policy Based Scheduler and Solver Scheduler:
> https://docs.google.com/document/d/1RfP7jRsw1mXMjd7in72ARjK0fTrsQv1bq
> olOri
> This document briefs the mechanism of the two schedulers and the
possibility of
> cooperation. It is my personal point of view only.
> In a nutshell, Policy Based Scheduler allows admin to define policies
for different
> physical resources (an aggregate, an availability-zone, or all
> infrastructure) or different (classes of) users. Admin can modify
> (add/remove/modify) any policy in runtime, and the modification effect
is only
> in the target (e.g. the aggregate, the users) that the policy is defined
to. Solver
> Scheduler solves the placement of groups of instances simultaneously by
> all the known information into a integer linear system and uses Integer
> solver to solve the latter. Thus relation between VMs and between VMs-
> computes are all accounted for.
> If working together, Policy Based Scheduler can supply the filters and
> following the policies rules defined for different computes.
> These filters and weighers can be converted into constraints & cost
function for
> Solver Scheduler to solve. More detailed will be found in the doc.
> I look forward for comments and hope that we can work it out.
> Best regards,
> Khanh-Toan TRAN
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev

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