Warming up a loop

Hello

I was reading the

FAQ About the Java HotSpot VM

and I camed up this Q&A

Should I warm up my loops first so that Hotspot will compile them?

Warming up loops for HotSpot is not necessary. HotSpot contains On Stack Replacement technology which will compile a running (interpreted) method and replace it while it is still running in a loop. No need to waste your applications time warming up seemingly infinite (or very long running) loops in order to get better application performance.

What is warming up a loop?

cheers,

Ehsan

[628 byte] By [Ehsan.Sa] at [2007-11-27 7:59:10]