Public bug reported: Description =========== Periodic task update_available_resource takes 20 seconds for 100 instances on local storage:
https://github.com/openstack/nova/blob/stable/pike/nova/compute/resource_tracker.py#L694 Steps to reproduce ================== 1. /etc/nova/nova.conf: [DEFAULT] preallocate_images=space [libvirt] images_type=raw 2. Launch 100 instances on the host 3. See, that every update_available_resource() takes 20 seconds This performance regression was introduced in this commit: https://github.com/openstack/nova/commit/d88b75e81eabfbd463007f6a4f27e6966a466530 and following commit doubles the time: https://github.com/openstack/nova/commit/938c0a745325fa73d098c6d5ddd20b2a599f9624 Expected result =============== update_available_resource() takes less than 5 seconds Actual result ============= update_available_resource() lasts for 20-30 seconds Environment =========== 1. Exact version of OpenStack you are running: OpenStack Pike nova 16.1.4, commit b58c7f0 2. Which hypervisor did you use? Libvirt + KVM/QEMU 2. Which storage type did you use? local storage, raw ** Affects: nova Importance: Undecided Status: New ** Summary changed: - Performance regression in libvirt get_available_resource(nodename) + Performance regression in libvirt get_available_resource() -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1785827 Title: Performance regression in libvirt get_available_resource() Status in OpenStack Compute (nova): New Bug description: Description =========== Periodic task update_available_resource takes 20 seconds for 100 instances on local storage: https://github.com/openstack/nova/blob/stable/pike/nova/compute/resource_tracker.py#L694 Steps to reproduce ================== 1. /etc/nova/nova.conf: [DEFAULT] preallocate_images=space [libvirt] images_type=raw 2. Launch 100 instances on the host 3. See, that every update_available_resource() takes 20 seconds This performance regression was introduced in this commit: https://github.com/openstack/nova/commit/d88b75e81eabfbd463007f6a4f27e6966a466530 and following commit doubles the time: https://github.com/openstack/nova/commit/938c0a745325fa73d098c6d5ddd20b2a599f9624 Expected result =============== update_available_resource() takes less than 5 seconds Actual result ============= update_available_resource() lasts for 20-30 seconds Environment =========== 1. Exact version of OpenStack you are running: OpenStack Pike nova 16.1.4, commit b58c7f0 2. Which hypervisor did you use? Libvirt + KVM/QEMU 2. Which storage type did you use? local storage, raw To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1785827/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
