I've attached a copy of the JMeter test plan I've used to test copying collections. You'll need a file specifying some users to make use of it (see 'Mahara users CSV' element in the test plan).
Adding a sleep to execute_sql() didn't make any difference from me (either with jmeter or a 4 user browser test) but I probably have a much smaller test db than you which might be making enough of a difference. Did the deadlock messages from 'show engine innodb status' give anything useful? Looking at the page/collection page logic, one thing it does is delete all rows in view_rows_columns before reinserting for a given view. If nothing exists in view_rows_columns for that view, the deletes would cause gap locks at the end of table. Which could then cause the following inserts to view_rows_columns to fail in the deadlock state we've seen. ** Attachment added: "JMeter test plan for copy collection" https://bugs.launchpad.net/mahara/+bug/1514608/+attachment/4517293/+files/copy_collection_test.jmx -- You received this bug notification because you are a member of Mahara Contributors, which is subscribed to Mahara. Matching subscriptions: Subscription for all Mahara Contributors -- please ask on #mahara-dev or mahara.org forum before editing or unsubscribing it! https://bugs.launchpad.net/bugs/1514608 Title: MySQL deadlock issues with simultaneous users Status in Mahara: In Progress Bug description: The patch in Bug 1492919 resolved the deadlock issues for some users, but others are still reporting that they are getting deadlocks. This seems to be an issue unique to MySQL, and it can happen with as few as 2 or 3 concurrent users. It has been reported across all stable versions. Strangely, it seems to be a relatively recent issue (i.e. we never heard this with Mahara 1.8 or 1.7, etc), so this suggests it was triggered by something that changed fairly recently. One possible candidate is our switch to the mysqli driver (before that Mahara wasn't doing transactions at all, in mysql). See also: * https://mahara.org/interaction/forum/topic.php?id=7309 * https://mahara.org/interaction/forum/topic.php?id=7432 To manage notifications about this bug go to: https://bugs.launchpad.net/mahara/+bug/1514608/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~mahara-contributors Post to : [email protected] Unsubscribe : https://launchpad.net/~mahara-contributors More help : https://help.launchpad.net/ListHelp
