Re: JavaMemoryModel: Worries about JIT compilation and class loading on multiprocessors

From: Paul Haahr (
Date: Wed Jul 14 1999 - 16:44:19 EDT

> Do people agree that something like this is required?

I'm not sure. I think for processors which permit this much staleness,
it's almost a prerequisite to have a working pool (for each processor?)
of ``fresh'' memory which is guaranteed to not be in cache on other
processors. Such memory could be allocated at each garbage collection.
Combined with knowledge of cache line width, it's probably reasonable to
use fresh memory and write-once techniques for JITed code and the like.

On the other hand, aggressive pre-fetching might defeat such techniques.
I can't quite see how yet, but I'm sure somebody else will.

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