Improve Performance of n-odl DB operations
Bug #1791348 reported by
Sai Sindhur Malleni
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
networking-odl |
Fix Released
|
Undecided
|
Unassigned |
Bug Description
When running a performance and scale testing scenario to create 100 networks, subnets and one VM per subnet, we observe that the function
get_pending_
We can use baked queries(http://
description: | updated |
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Reviewed: https:/ /review. openstack. org/591363 /git.openstack. org/cgit/ openstack/ networking- odl/commit/ ?id=7fdbd351066 e7014052caa9cc3 af7f74b7952990
Committed: https:/
Submitter: Zuul
Branch: master
commit 7fdbd351066e701 4052caa9cc3af7f 74b7952990
Author: Sai Sindhur Malleni <email address hidden>
Date: Mon Aug 13 16:36:55 2018 +0530
Implement Baked Query
When running a performance and scale testing scenario to create pending_ or_processing_ ops is called 5636 times (total time of 0.426 seconds pending_ db_row_ with_lock docs.sqlalchemy .org/en/ latest/ orm/extensions/ baked.html
100 networks, subnets and one VM per subnet, we observe that the function
get_
and cumulative time of 135 seconds) and get_oldest_
is called 8450 times (total time 1.747 seconds and cumulative time 685 seconds).
This patch implements baked queries to reduce time spent in these functions.
The "baked" query system in SQLAlchemy caches the string
SQL statement for a particular Query-construction path. As
some profiling in Neutron have observed 30-40% time spent in
constructing Query objects due to the many small "fetch-one-object"
style of query, the "baked" system may potentially be able to
greatly reduce this in neutron and its drivers. Networkind-odl is
traditionally known to slow down things due to journaling and this
patch aims to improve that situation. Baked Query Docs:
http://
Profiling networking-odl, we see that the with baked queries or_processing_ ops reduced by 40.7% pending_ db_row_ with_lock reduced by 60.6%.
time spent in get_pending_
and time spent in get_oldest_
Closes-Bug: 1791348 facc1bfd2169e29 b42617c6ac1
Change-Id: Ieb5f14e100ea48