JEP 189: Shenandoah: An Ultra-Low-Pause-Time Garbage Collector (original) (raw)

Vitaly Davidovich vitalyd at gmail.com
Fri Jan 17 22:46:34 UTC 2014

I think the issues with G1 were more implementation bugs; that is, some code had a bug that was hidden/uncaught on stronger memory models. I don't think there's anything in G1's design that's an issue. At least that's what I understood by looking at CRs coming from Volker/Goetz.

Sent from my phone On Jan 17, 2014 5:01 PM, "Christine Flood" <chf at redhat.com> wrote:

I stopped working on GC after the G1 paper was published. Can you elaborate on the issues you have with G1 on PowerPC machines?

Our algorithm should work if you have a dependable CAS instruction. I will ask about access to a PowerPC machine. Christine ----- Original Message ----- > From: "Volker Simonis" <volker.simonis at gmail.com> > To: "Roman Kennke" <rkennke at redhat.com>, chf at redhat.com > Cc: "Hotspot-Gc-Dev" <hotspot-gc-dev at openjdk.java.net> > Sent: Friday, January 17, 2014 4:09:40 PM > Subject: Re: JEP 189: Shenandoah: An Ultra-Low-Pause-Time Garbage Collector > > Hi Roman, Christine, > > I'm really looking forward to hear your talk about Shenandoah on FOSDEM. > > But now that you already asked for questions: > > Will you design the new collector with weak memory model architectures > in mind. I know that it is hard if you don't have the corresponding > hardware but I think RedHat should at least have access to some decent > PowerPC machines and I would strongly advise you to test there > thoroughly from the very beginning. We had (and still have) a lot of > problems with G1 on these architectures. > > Regards, > Volker > > On Fri, Jan 17, 2014 at 8:28 PM, Roman Kennke <rkennke at redhat.com> wrote: > > Hi there, > > > > Sorry being so silent... we are very happy that the Shenandoah JEP has > > finally been posted and would welcome any comments, questions, > > discussion from the community. > > > > Cheers, > > Roman > > > > Am Mittwoch, den 15.01.2014, 11:49 -0800 schrieb > > mark.reinhold at oracle.com: > >> Posted: http://openjdk.java.net/jeps/189 > >> > >> - Mark > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.openjdk.org/pipermail/hotspot-gc-dev/attachments/20140117/0c1b45e7/attachment.htm>

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