Balazs Gibizer
3c23390cc8
This changes the thread pool usage of the ComputeManager to go through the concurrency mode aware util functions. The concurrent live migration pool had a seemingly unlimited option when configured with value 0, but in reality GreenThreadPool has a default worker size of 1000. In reality it is almost never right to have more than one live migration running concurrently. Also with native threading having 1000 worker is just too costly. So we decided to deprecate the value 0 and changed the implementation of unlimited to mean 5 threads in native threading mode. We kept the 1000 greenthread in eventlet mode for backward compatibility. The _sync_power_states periodic task also spawn tasks for each instance to be synced. As it uses a shared data structure across these tasks and the caller a lock is needed to avoid race conditions. Also the default pool size is 1000 for these tasks in our configuration. That would use a lot of memory on a busy host in native threading mode. So we changed the default value from 1000 to 5. Change-Id: I9567d5fabdf086b5d0493103d9f6bde4f66af387 Signed-off-by: Balazs Gibizer <gibi@redhat.com>
============== OpenStack Nova ============== OpenStack Nova provides a cloud computing fabric controller, supporting a wide variety of compute technologies, including: libvirt (KVM, Xen, LXC and more), VMware and OpenStack Ironic. Use the following resources to learn more. API --- To learn how to use Nova's API, consult the documentation available online at: - `Compute API Guide <https://docs.openstack.org/api-guide/compute/>`__ - `Compute API Reference <https://docs.openstack.org/api-ref/compute/>`__ For more information on OpenStack APIs, SDKs and CLIs in general, refer to: - `OpenStack for App Developers <https://www.openstack.org/appdev/>`__ - `Development resources for OpenStack clouds <https://developer.openstack.org/>`__ Operators --------- To learn how to deploy and configure OpenStack Nova, consult the documentation available online at: - `OpenStack Nova <https://docs.openstack.org/nova/>`__ 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: - `Bug Tracker <https://bugs.launchpad.net/nova>`__ Developers ---------- For information on how to contribute to Nova, please see the contents of the CONTRIBUTING.rst. Any new code must follow the development guidelines detailed in the HACKING.rst file, and pass all unit tests. To understand better the processes that the team is using, please refer to the `Process document <https://docs.openstack.org/nova/latest/contributor/process.html>`__. Further developer focused documentation is available at: - `Official Nova Documentation <https://docs.openstack.org/nova/>`__ - `Official Client Documentation <https://docs.openstack.org/python-novaclient/>`__ Other Information ----------------- During each `Summit`_ and `Project Team Gathering`_, we agree on what the whole community wants to focus on for the upcoming release. The plans for nova can be found at: - `Nova Specs <http://specs.openstack.org/openstack/nova-specs/>`__ .. _Summit: https://www.openstack.org/summit/ .. _Project Team Gathering: https://www.openstack.org/ptg/