JEP 144: Reduce GC Latency for Large Heaps

Tony Printezis tony.printezis at
Wed Feb 29 20:14:35 UTC 2012


The fix should be on all the open repos by now and should also be 
included in the upcoming 7u4 release (i.e., it's in hotspot 23).


On 02/29/2012 03:04 PM, Todd Lipcon wrote:
> 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
> myself?)
> -Todd

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