[Building Sakai] Samigo on 2.9.2 veery low ..eventually grinding site to a halt

[Stephen Marquard]

Hi David

There may be several different reasons for running out of thread and db pools, but one immediate improvement would be to change the settings so as not to do immediate submission to the Gradebook, which will reduce database contention on submission. You can then change the assessment settings later to submit the grades to Gradebook.

If you have large numbers of students taking assessments, it's a good idea to load-test your cluster in advance with JMeter or similar.

Regards
Stephen

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Stephen Marquard, Learning Technologies Co-ordinator
Centre for Innovation in Learning and Teaching (CILT, formerly CET and HAESDU)
University of Cape Town
http://www.cet.uct.ac.za<http://www.cet.uct.ac.za/>
stephen.marquard at uct.ac.za<mailto:stephen.marquard at uct.ac.za>
Phone: +27-21-650-5037 Cell: +27-83-500-5290

From: sakai-dev-bounces at collab.sakaiproject.org [mailto:sakai-dev-bounces at collab.sakaiproject.org] On Behalf Of David Wafula Wanyonyi
Sent: 30 April 2014 11:46 AM
To: dev sakai
Subject: [Building Sakai] Samigo on 2.9.2 veery low ..eventually grinding site to a halt

Dear all,
Since last night we are experiencing very poor performance of Samigo on 2.9.2. Over 900 students were trying to submit and this exhausts all the Thread and DB pools, affectively freezing the servers. The assessment in question has a Grading setting for  immediate submission of grades to gradebook.
Has anyone experienced this ?
Regards,
david.
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