not really, @Stateful vs @Stateful + extended persistence context. This is quite particular more particular. However overhead is really in the way jpa does way more for you, compare your updates for instance.
Romain Manni-Bucau @rmannibucau <https://twitter.com/rmannibucau> | Blog <https://blog-rmannibucau.rhcloud.com> | Old Blog <http://rmannibucau.wordpress.com> | Github <https://github.com/rmannibucau> | LinkedIn <https://www.linkedin.com/in/rmannibucau> | JavaEE Factory <https://javaeefactory-rmannibucau.rhcloud.com> 2017-06-20 16:16 GMT+02:00 Steve Goldsmith <sgj...@gmail.com>: > @Stateful was used in both examples, so the impact would have been the > same? The real way to find the latency is to profile the code which I will > do as well. > > On Tue, Jun 20, 2017 at 10:03 AM, Romain Manni-Bucau < > rmannibu...@gmail.com> > wrote: > > > not sure what you reference by "string" but JPA needs more round trip to > be > > "hot" (optimized) than dbutils which doesnt pretty much nothing. The > state > > management etc is also an overhead. > > > > If you update your example to have a @Version for instance you will start > > to realize it, then add a small layer to not have to build yourself the > > update query and you will see another part etc. > > > > I would probably recommand you to maybe evaluate this: try with mysql to > > have some real db latency and compare the db latency to jpa overhead - > > and/or try with N threads with hsqldb ;). > > > > Generally the overhead once tuned is acceptable compared to the DB > latency > > and you are often in the IO layer and not the runtime layer. > > > > Side note about the example: i think the goal was to show how to use a > > stateful, name is probably not that great :s > > > > > > > > Romain Manni-Bucau > > @rmannibucau <https://twitter.com/rmannibucau> | Blog > > <https://blog-rmannibucau.rhcloud.com> | Old Blog > > <http://rmannibucau.wordpress.com> | Github <https://github.com/ > > rmannibucau> | > > LinkedIn <https://www.linkedin.com/in/rmannibucau> | JavaEE Factory > > <https://javaeefactory-rmannibucau.rhcloud.com> > > > > 2017-06-20 15:58 GMT+02:00 Steve Goldsmith <sgj...@gmail.com>: > > > > > I copied the JPA stuff from the TomEE examples, so if it is not > > optimized, > > > using the wrong state, scope, etc. then perhaps the example should be > > > updated to reflect that. I will try what you recommend and post new > > times. > > > The data is exactly the same size, so are you saying because the > strings > > > are not identical there may be a difference? Just trying to understand > > that > > > perspective. I'll just roll both tests into one to use the same data. > > > > > > On Tue, Jun 20, 2017 at 2:53 AM, Andy Gumbrecht < > > agumbre...@tomitribe.com> > > > wrote: > > > > > > > So just at a super quick glance - Before we start to anything else. > > > > > > > > You should modify the code to use the same (identical) random data > for > > > both > > > > tests. > > > > Add hibernate.jdbc.batch_size = 25 to your persistence.xml properties > > > > Never use @Stateful unless you really understand why you should, i.e. > > use > > > > @Stateless for your JpaMovies > > > > Use entityManager#find rather than a query > > > > > > > > Hope this is a quick insight, but I'd also be interested to see the > > > results > > > > on just these few changes. > > > > > > > > Andy. > > > > > > > > On 20 June 2017 at 05:31, Laird Nelson <ljnel...@gmail.com> wrote: > > > > > > > > > Have you sat down for a good long reading session with > > > > > http://java-persistence-performance.blogspot.com/? I found that > > site > > > > > invaluable. > > > > > > > > > > Best, > > > > > Laird > > > > > -- > > > > > http://about.me/lairdnelson > > > > > > > > > > On Mon, Jun 19, 2017 at 8:22 PM sgjava <sgj...@gmail.com> wrote: > > > > > > > > > > > I just built a project to compare JPA+Hibernate to a DBUtils > > > > > > implementation. > > > > > > DBUtils is a lot faster by a large margin. Can anyone tell me if > > they > > > > > have > > > > > > tuned JPA to perform better? I used TomEE 7.0.4-SNAPSHOT. I could > > > live > > > > > with > > > > > > maybe a 10% difference, but I'm talking about 10 to 10 times > > slower! > > > > > > > > > > > > https://github.com/sgjava/jpavsdbutils > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > View this message in context: > > > > > > http://tomee-openejb.979440.n4.nabble.com/JPA-vs-DBUtils- > > > > tp4681918.html > > > > > > Sent from the TomEE Users mailing list archive at Nabble.com. > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > Andy Gumbrecht > > > > https://twitter.com/AndyGeeDe > > > > http://www.tomitribe.com > > > > > > > > > > > > > > > > -- > > > Steven P. Goldsmith > > > > > > > > > -- > Steven P. Goldsmith >
