JEP 144: Reduce GC Latency for Large Heaps

Todd Lipcon todd at
Wed Feb 29 20:04:39 UTC 2012

On Wed, Feb 29, 2012 at 9:23 AM, Tony Printezis
<tony.printezis at> wrote:
> Todd,
> I recently pushed a change that causes G1 to be more aggressive when
> choosing which old regions to collect during mixed GCs. I think it still
> needs a bit more fine-tuning but it's much better compared to what we had
> before which I admit it was sub-optimal and fiddly. It should address both
> issues you mentioned below.

Thanks for the update, Tony. Are these fixes in the latest JDK7
releases? Or do I need to build from hg? (is there a snapshot/nightly
build from hg I could try if the latter to avoid the pain of building

Todd Lipcon
Software Engineer, Cloudera

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