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RE: Alignment problem with hashtable locks on PowerPC
- From: Jeff Sturm <jsturm at one-point dot com>
- To: "Boehm, Hans" <hans_boehm at hp dot com>
- Cc: "'Bryce McKinlay'" <bryce at waitaki dot otago dot ac dot nz>, "'java-patches at gcc dot gnu dot org '" <java-patches at gcc dot gnu dot org>
- Date: Fri, 16 Nov 2001 00:22:58 -0500 (EST)
- Subject: RE: Alignment problem with hashtable locks on PowerPC
On Thu, 15 Nov 2001, Boehm, Hans wrote:
> JVMs that use a compacting garbage collector don't really have much of a
> choice in this matter, since they need some extra header bits for hashcodes
> etc. anyway. Thus usually you can find the space for a few synchronization
> bits in the second header word, and there is little point in not using it.
> Gcj has a choice. Thus there's an opportunity for the experiment ...
Interesting. Related to that I recently saw this discussion regarding
the flex compiler:
http://www.flex-compiler.lcs.mit.edu/Harpoon/hypermail/java-dev/0233.html
Jeff