G1 Performance [Was: JEP 248: Make G1 the Default Garbage Collector]

Erik Österlund erik.osterlund at lnu.se
Thu Jul 30 09:19:38 UTC 2015

Hi Andrew,

> On 30 Jul 2015, at 11:02, Andrew Dinn <adinn at redhat.com> wrote:
> On 30/07/15 09:42, Erik Österlund wrote:
>> Sorry for interrupting the discussion, but some things need setting
>> straight about my current work.
> Thanks for the status update and apologies for misleading anyone as to
> what you have actually been up to (I only intended to comment on what
> was discussed in the earlier thread).
>  . . .

No problem!

>> All in all, my solution depends less on IPI than the current
>> solution. I don’t use IPI for serializing thread states, I don’t use
>> it for safepoints, I don’t use it for ADS. Yet that membar in the G1
>> write barrier is gone with good performance improvements on my
>> machine in some G1 stressing microbenchmarks.
> That's good news. Am I right to presume that the membar is also not
> needed with CMS+USeCondCardMark?

Yup! :)

>> Details will probably follow at some point in the future in a
>> separate thread when the time is right.
> Looking forward to that :-)

Me too! :)


> regards,
> Andrew Dinn
> -----------
> Senior Principal Software Engineer
> Red Hat UK Ltd
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