How are Hot Spot Compilers and VMs of different vendors fit together?

I read that the Hot Spot technology is splitted up into a Hot Spot compiler and a Hot Spot VM. Since maybe the ISV uses another Hot Spot Compiler (maybe IBM on Windows) to compile and the user drives that app on another Hot Spot VM (maybe Novell on Netware), I am wondering how this fits together?
Do some compiler/VM couples make problem? Do some combinations produce higher performance or smaller memory load than others?
Any comments welcome! :-)

You compiled the same application using jikes and the
sun javac and then ran it on the the same jvm (and
version) and got a 10% improvement using the jikes
binary?Yes, but this was more than a year ago. I used javac from Sun 1.3 in comparison with the latest jikes from IBM. Both binaries I started on a Sun 1.3 VM and the jikes code performed UP TO 10% for SOME CASEs. It was a micro benachmark, so I could imagine that jikes optimized some code sequences out of the code, whereas javac did not. Anyway, micro benchmarks are not totally exact and one should do an application benchmarking with the latest compilers from both companies.

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