Hi Max, Couple of months ago we were evaluating the use of Hibernate, and were ran some performance comparisons between popular ORM tools. One of the things we noticed is that serialization of lazy initialization poxies is time consuming. I admit that when using Hibernate entities as DTOs the proxy fields should be nulled out, ideally.
But what we would like to understand is, in your tests have you noticed this before? If so, what kind of impact does it impose on serialization of entities? Thanks, Binil PS: We chose to go with Hibernate, BTW :-) On Sun, 26 Dec 2004 22:30:03 +0100, Max Rydahl Andersen <[EMAIL PROTECTED]> wrote: > Hi guys, > > Just reran a set of startup performance tests, to see if something has > changed or I would be able to point out some new places > to put in some speedups. Unfortunately (or as expected) not much has > changed. > > The same pattern always emerge on startup performance: > > #1. xml reading is 40-60% if one doesnt use the serialized version...so > use addCachableFile() to do an EASY performance boost! > #2. FastClass creation takes 23% (when using serialized xml files). After > looking at the source I could see that fastclass is ONLY > needed when the cglib optimizer is used, so I removed creation of > fastClass'es. > The "funny" thing is that I don't think it makes any difference since > after removing this ClassLoader and normal reflection popped up > as using approximate the same time. (hinting that FastClass just > triggered that in a different way). So disabling cglib optimizer might not > give that much of a boost..my emperi hints it's <5%) > #3. After #1 & #2 the biggest time-stealer is reflection and classloading. > (nothing much to do about this except not adding classes not needed to > the configuration) > > So, caching the classes generated by cglib I do not think will matter much > since it will be replaced with classloading. > The next step I see is lazy creation of EntityPersisters and/or trying to > serialize the actual SessionFactory (but that is a tough one - since to > alloew deserializing parts of the persisters, loaders, caches etc. need > access to stuff only available in SessionFactory which they don't all have > access to) > > -- > Max Rydahl Andersen > callto://max.rydahl.andersen > > Hibernate > [EMAIL PROTECTED] > http://hibernate.org > > JBoss Inc > [EMAIL PROTECTED] > http://jboss.com > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://productguide.itmanagersjournal.com/ > _______________________________________________ > hibernate-devel mailing list > hibernate-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/hibernate-devel > ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://productguide.itmanagersjournal.com/ _______________________________________________ hibernate-devel mailing list hibernate-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hibernate-devel
