[Deploying Sakai] Server slowdown

Matthew Buckett matthew.buckett at oucs.ox.ac.uk
Wed Apr 28 01:50:16 PDT 2010

On 27 April 2010 22:31, Grossman,John E <john.grossman at mdanderson.org> wrote:
> One of our Sakai production servers slowed to a near standstill with about
> 90 users logged in and taking final exams. We are running Sakai 2.6.0 on a
> 4-processor 64-bit Windows machine with 8 GB of RAM with 5 GB allocated to
> the JVM. The chain of errors started with those in the attached zip file.
> Eventually no one could log in and it would take 10-15 minutes for a user
> interface action such as a button click to take effect. Processor
> utilization on the server was 0-2% during this episode and there was about
> 200 MB of available memory according to the Memory tool in the admin
> workspace. Would appreciate any suggestions.

I think the errors in your attached file could well be related to this
issue in JIRA:


I don't have any good ideas as to why the server became slow, if there
the CPU load is low and there isn't much disk activity locally I'd
look for exhaustion somewhere:

- Database connection pool.
- Tomcat worker threads.

Do you have the DB on a separate machine?
Do you have more than one tomcat worker node?
Is so what's doing your frontend load balancing?

  Matthew Buckett
  VLE Developer, LTG, Oxford University Computing Services

More information about the production mailing list