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From Egor Pasko <egor.pa...@gmail.com>
Subject Re: [DRLVM][GCv5] (H-2945) scalable parallel generational or non-generational collection
Date Mon, 08 Jan 2007 06:54:35 GMT
On the 0x256 day of Apache Harmony Xiao-Feng Li wrote:
> Hi, I've submitted a patch for GCv5 at URL:
> https://issues.apache.org/jira/browse/HARMONY-2945, which achieves
> good parallelization scalability in real SMP machines. It can works in
> generational or nongenerational mode. I have tested it on a Intel
> Tulsa platform which has four Pentium-D dual-core processors (totally
> 8 cores). It performs pretty well. With more processors and larger
> heap size, this parallel GC can demonstrate more benefits.
> There are two dependences:
> 1. To fully exploit this GC's adavantage, helper inlining should be
> enabled for it. It depends on Harmony-2652 which inlines write
> barrier.
> 2. Some JIT optimizations do not implement write barrer for reference
> field update. These opts have to be disabled to make the generational
> mode work.

Xiao-Feng, what specific optimizations did you have to disable? I
believe, we can re-enable them in GCv5 mode pretty fast.

> At the same time before the two dependences are resolved, people still
> can play with it in non-generational mode. But the performance will be
> impacted seriously without helper inlinings.
> Dear commiter, please help to integrate it into Harmony SVN. Please
> apply the patch at working_vm directory.
> Thanks,
> xiaofeng

Egor Pasko

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