It introduces a new scheduler host manager driver to apply an eventually consistent update model to scheduler host states. It excludes the involvement of database during decision making like caching scheduler. But the scheduler caches are always almost up-to-date because they receive incremental updates directly from compute nodes, and the schedulers know whether or not their decisions are successful compute nodes. The throughput of this prototype implementation is boosted to at least 510% compared with the legacy implementation in the same 1000-node simulation.
To run and test this prototype, clone this repo in devstack and set scheduler_host_manager=shared_host_manager in "nova.conf". Do not forget to update "nova/nova.egg-info/entry_points.txt" according to the modified "setup.cfg". Also note: Multiple scheduler instances can only run on separate machines, and this prototype supports filter schedulers and caching schedulers running at the same time.
To understand its whole design, the detailed specification is in https://review.openstack.org/#/c/306844/
A generic tool is implemented to evaluate the performance of filter scheduler, caching scheduler and this prototype in various configuations and in real OpenStack environment: https://github.com/cyx1231st/nova-scheduler-bench
A very detailed performance analysis is made based on this tool to compare the performance with existing implementations. It is http://lists.openstack.org/pipermail/openstack-dev/2016-June/098202.html
Another benchmarking tool is implemented to verify the general idea of this design by modeling the implementation: https://github.com/cyx1231st/placement-bench
The detailed analysis about why it should have great improvement lies in http://lists.openstack.org/pipermail/openstack-dev/2016-March/087889.html
OpenStack Nova provides a cloud computing fabric controller, supporting a wide variety of virtualization technologies, including KVM, Xen, LXC, VMware, and more. In addition to its native API, it includes compatibility with the commonly encountered Amazon EC2 and S3 APIs.
OpenStack Nova is distributed under the terms of the Apache License, Version 2.0. The full terms and conditions of this license are detailed in the LICENSE file.
Nova primarily consists of a set of Python daemons, though it requires and integrates with a number of native system components for databases, messaging and virtualization capabilities.
To keep updated with new developments in the OpenStack project follow @openstack on Twitter.
To learn how to deploy OpenStack Nova, consult the documentation available online at:
For information about the different compute (hypervisor) drivers supported by Nova, read this page on the wiki:
In the unfortunate event that bugs are discovered, they should be reported to the appropriate bug tracker. If you obtained the software from a 3rd party operating system vendor, it is often wise to use their own bug tracker for reporting problems. In all other cases use the master OpenStack bug tracker, available at:
Developers wishing to work on the OpenStack Nova project should always base their work on the latest Nova code, available from the master GIT repository at:
Developers should also join the discussion on the mailing list, at:
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Any new code must follow the development guidelines detailed in the HACKING.rst file, and pass all unit tests. Further developer focused documentation is available at:
For information on how to contribute to Nova, please see the contents of the CONTRIBUTING.rst file.
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