I seriously doubt the performance cost of 20 'parallel arrays' versus 1 array of Objects holding those 20 values is anything but negligible at best.
On Thu 03 May 2012 11:04:30 AM CDT, Emmanuel Bernard wrote: > Sorry I could not assist the meeting live but reviewed the logs and had some > remarks, so ehre are the logs and my remarks :) > > ## Meeting logs > > http://transcripts.jboss.org/meeting/irc.freenode.org/hibernate-dev/2012/hibernate-dev.2012-05-03-14.01.html > Minutes > (text):http://transcripts.jboss.org/meeting/irc.freenode.org/hibernate-dev/2012/hibernate-dev.2012-05-03-14.01.txt > Log: > http://transcripts.jboss.org/meeting/irc.freenode.org/hibernate-dev/2012/hibernate-dev.2012-05-03-14.01.log.html > > ## About parallel arrays vs arrays of objects > > Even today, there is a cost in using Objects or HashMap as data placeholders. > This might not be relevant for us especially since we are not using them for > "live" data but since memory footprint has always been a concern for > Hibernate, it's worth mentioning. > > This presentation is quite interesting and show the extra memory cost of such > structure compared to arrays > http://www.cs.virginia.edu/kim/publicity/pldi09tutorials/memory-efficient-java-tutorial.pdf > > ## PessimisticLockException versus LockAcquisitionException > > I am not certain of that and Git history got cut short with the migration of > entitymanager into core. But I do have recollections of some lock exceptions > that were not catch up and I had to use PessimisticLockException. It could > have been a change triggered by the TCK. Again I might be wrong, it was a > long time ago. Plus ORM's core has evolved since. > > Emmanuel > _______________________________________________ > hibernate-dev mailing list > hibernate-dev@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/hibernate-dev -- st...@hibernate.org http://hibernate.org _______________________________________________ hibernate-dev mailing list hibernate-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev
