JEP 248: Make G1 the Default Garbage Collector (original) (raw)

Kim Barrett kim.barrett at oracle.com
Tue Jun 2 01:04:36 UTC 2015

On Jun 1, 2015, at 7:04 PM, Jeremy Manson <jeremymanson at google.com> wrote:

- Part of the reason our CMS performs better is that we've made changes to CMS to improve its performance. We see roughly half as much CPU utilization, and the long tail pause times have been cut dramatically. It would be nice if we could upstream the changes (especially for us, because they break with every new release, and we have to fix them!), but we've never been able to find anyone at Oracle who has the bandwidth to do the reviews. For example, the response to this: http://mail.openjdk.java.net/pipermail/hotspot-gc-dev/2015-May/013426.html was not hugely enthusiastic, and that's not even one of the more complex changes.

I’d be interested in looking at the mentioned card table scanning speedup. But I completely missed that comment, buried as it is in the middle of a more or less unrelated discussion. I’m going to go reply over there, since that technical problem doesn’t have anything to do with what’s being discussed here.

More information about the hotspot-dev mailing list