Peter,
there are lies, damn lies and benchmarks.
First of all, thanks for the supplied test and sources.
Second, I've run the tests on my machine (1GHz AMD, .5GB RAM, Linux
Kernel 2.4.18, JVM 1.4.0_02). I know that any comparisons to your
systems are probably apples and oranges (you're on a Windows box,
right?), but I'm getting significantly different numbers.
JBoss version is Branch_3_0 as per CVS 15 minutes ago:
[Server] JBoss (MX MicroKernel) [3.0.5RC1 Date:200211081043] Started in
0m:41s:32ms
> 14:31:46,328 INFO [STDOUT] Initial Retrival, beans may or maynot be in
> cache.
> 14:31:46,375 INFO [STDOUT] finder took 47ms.
> 14:31:49,140 INFO [STDOUT] External ValueObject creation took 2765ms
> for 1000 objects.
> 14:31:49,859 INFO [STDOUT] Internal ValueObject creation took 719ms for
> 1000 objects.
> 14:31:49,859 INFO [STDOUT] Secondary Retrival, beans are in cache.
> 14:31:50,125 INFO [STDOUT] finder took 266ms.
> 14:31:52,765 INFO [STDOUT] External ValueObject creation took 2640ms
> for 1000 objects.
> 14:31:53,437 INFO [STDOUT] Internal ValueObject creation took 672ms for
> 1000 objects.
it's odd but it seems that you are not getting any significant
performance increase on the second run. my logfile states:
creating 1000 Blobs...
Creation complete, took 29046ms.
testing retrival speed...
Initial Retrival, beans may or maynot be in cache.
finder took 265ms.
External ValueObject creation took 4859ms for 1000 objects.
Internal ValueObject creation took 1497ms for 1000 objects.
Secondary Retrival, beans are in cache.
finder took 1334ms.
External ValueObject creation took 2994ms for 1000 objects.
Internal ValueObject creation took 679ms for 1000 objects.
As you can see I have a significant performance increase between the
initial and the secondary retrieval.
Every time I call your Test program again afterwards (w/o restarting
JBoss), I'm getting roughly the figures of the Secondary Retrieval in
both cases which hints that the Entity Beans are retrieved from cache
rather than from the DB.
You _are_ running a vanilla 3.0.4 system w/ no changes to the
configuration files, aren't you?
I'll try to pipe this through OptimizeIt to see where JBoss spends its
time during the test. Unfortunately I don't have the time to get
WebLogic 7 up and running to get a good comparison vs. JBoss.
Best regards,
Christian
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