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From C├ęsar Camilo Lugo Marcos <>
Subject Concurrency
Date Mon, 30 May 2016 18:45:14 GMT

We have sarted performing some stress tests to our Apache ISIS
application. We have found this behavior:

- If we run 1 concurrent user, average response times to the main object
reads through the wicket viewer are from 1 to 1.5 seconds.
- If we run 2 concurrent users, same transactions go to average response
times up to 16 to 27 seconds.
- If we run 10 concurrent users, the transactions start to slow down
significantly until the app server freezes and we have to restart it.

As you can see, this is a very significant increase in response time for
such a slight change in user load (from 1 user to 2 users). So we are
guessing we should look into the concurrency control.

In the documentation I have found that the only way to influence the way
Apache ISIS manages transactions and concurrency checking is by using
the semantics configuration of the ACTION annotation. 


I just wanted to confirm if this is the place to look into, or are there
any other places where we should be looking into too, to solve the
performance issue.

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