The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
That's crazy talk! I wish there were a mode you could run the VM in where it would give you feedback on your code. And do it in the manner of Nick Burns, Your Company's Computer Guy [ June 23, 2008: Message edited by: Joe Ess ]
There was a session at JavaOne this year presented by Sun and Intel engineers where they outlined many of the performance improvements made in the recent versions of JVM 6, with more on the way. Interesting stuff.
There is a rule about performance that has been true at least for 40 years: Over time, equivalent ways of doing something merge to have identical performance.
Loop unrolling has been critical for performance for at least 15 years, Its great to see the JVMs doing it automatically and without any effort.
I think the next step is for languages to make use of quad and octo core processors simpler. Threads and Concurancy are necessary, but not sufficient. Its still way to hard to make code work in parallel.
subject: InfoQ article on Java Hotspot performance