Mercurial > p > roundup > code
view test/test_sqlite.py @ 6565:2c2dbfc332ba
Try to handle multiple connections better.
The session database is a hot spot. When multiple requests (e.g. 20)
come in at the same time session database contention can get great.
The original code didn't retry session database access when the open
failed. This resulted in errors at the client.
The second pass delayed 0.01 seconds and retried. It was better but we
still had multiple second stalls. I think the first request got in,
everybody else backed up and then retried at the same time. Again they
stepped on each other. With logging I would see many counters go all
the way to low single digits or to -1 indicating falure.
This pass uses randomint to generate delays from 0-.125 seconds in 5ms
increments. This performs better in testing. I rarely saw a counter
less than 13 (2 failed retries). Current logging starts after 6
failures and counts down until success or failure.
| author | John Rouillard <rouilj@ieee.org> |
|---|---|
| date | Thu, 16 Dec 2021 20:02:00 -0500 |
| parents | fcbeff272828 |
| children | 39189dd94f2c |
line wrap: on
line source
# # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/) # This module is free software, and you may redistribute it and/or modify # under the same terms as Python, so long as this copyright message and # disclaimer are retained in their original form. # # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE # POSSIBILITY OF SUCH DAMAGE. # # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS" # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE, # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. import unittest, os, shutil, time from roundup.backends import get_backend, have_backend from .db_test_base import DBTest, ROTest, SchemaTest, ClassicInitTest, config from .db_test_base import ConcurrentDBTest, FilterCacheTest from .db_test_base import SpecialActionTest from .rest_common import TestCase as RestTestCase class sqliteOpener: if have_backend('sqlite'): module = get_backend('sqlite') def nuke_database(self): shutil.rmtree(config.DATABASE) class sqliteDBTest(sqliteOpener, DBTest, unittest.TestCase): pass class sqliteROTest(sqliteOpener, ROTest, unittest.TestCase): pass class sqliteSchemaTest(sqliteOpener, SchemaTest, unittest.TestCase): pass class sqliteClassicInitTest(ClassicInitTest, unittest.TestCase): backend = 'sqlite' class sqliteConcurrencyTest(ConcurrentDBTest, unittest.TestCase): backend = 'sqlite' class sqliteFilterCacheTest(sqliteOpener, FilterCacheTest, unittest.TestCase): backend = 'sqlite' class sqliteSpecialActionTestCase(sqliteOpener, SpecialActionTest, unittest.TestCase): backend = 'sqlite' from .session_common import SessionTest class sqliteSessionTest(sqliteOpener, SessionTest, unittest.TestCase): pass class sqliteRestTest (RestTestCase, unittest.TestCase): backend = 'sqlite'
