I just setup a Maven/Jetty/Jmeter combo to do some simple regression
profiling of the code (per CAY-524). I was able to get some data
comparing 1.1.4, M12 and HEAD performance:
http://dev.objectstyle.org/~andrus/profile/
CAY-524 has some initial writeup on how to run the profiler. I'll put
more docs on Wiki in the future.
Preliminary conclusions:
* 1.2 and 1.1 are comparable in performance. Some things became
better, some became worse, but nothing sticks out as really bad.
* 1.2 uses a different JDBC strategy than 1.1 (Statement.execute()
instead of Statement.executeUpdate() + executeQuery()), so the
profiles look different on different databases, as this is driver
dependent. An extreme case - HSQLD "file:" URLs (not shown above)
result in 4x slowdown in 1.2, while after switching to "mem:" URL,
the differences between releases become insignificant.
* Still we can probably do better, so I will continue working on
profiling the individual scenarios (per CAY-525).
Also if anybody finds a scenario that behaves unusually slowly
compared to 1.1 or in general (such as CAY-438), please report them
via Jira.
Andrus
