[Patch] ParallelGC: Improve AlwaysPreTouch with multiple threads

amith pawar amith.pawar at gmail.com
Tue Aug 25 05:28:38 UTC 2020


Hello everyone,

Looks like due to some issue nobody received my patch earlier sent to this
group. Stefan created Webrev and JBS for this patch. Thanks Stefan for all
your help.

This patch improve ParallelGC pretouch time similar to other GCs.

Please reivew this change.

Thanks,
Amit


On Tue, Aug 25, 2020 at 3:04 AM <stefan.johansson at oracle.com> wrote:

> Hi Amit,
>
> I've now created a webrev and JBS entry for your proposal. Here are the
> links:
> Webrev:
> http://cr.openjdk.java.net/~sjohanss/sponsor/amit.pawar/8252221/00/
> JBS: https://bugs.openjdk.java.net/browse/JDK-8252221
>
> Thanks,
> Stefan
>
> On 2020-08-21 13:48, stefan.johansson at oracle.com wrote:
> > Hi Amit,
> >
> > Now the patch made it through =)
> >
> > Me or somebody else from the GC-team will provide feedback once we find
> > time to look at the patch.
> >
> > Thanks for reaching out,
> > Stefan
> >
> > On 2020-08-21 13:39, amith pawar wrote:
> >> Hi Stefan,
> >>
> >> Thanks for replying. First time got rejected and then resent it after
> >> subscribing to the group. Not sure how this happened.
> >>
> >> I am attaching again. Please do check.
> >>
> >> Thanks,
> >> Amit Pawar
> >>
> >> On Fri, Aug 21, 2020 at 1:29 PM <stefan.johansson at oracle.com
> >> <mailto:stefan.johansson at oracle.com>> wrote:
> >>
> >>     Hi Amit,
> >>
> >>     Your patch did not make it to the list. It might have been stripped.
> >>     Are
> >>     you subscribed to the list? That might be required to attach
> patches.
> >>
> >>     Thanks,
> >>     Stefan
> >>
> >>     On 2020-08-20 19:33, amith pawar wrote:
> >>      >   Hi,
> >>      >
> >>      > Currently AlwaysPreTouch for ParallelGC is done with a single
> >>     thread and
> >>      > this attached patch converts it to multithreaded similar to other
> >>     GCs.
> >>      >
> >>      > All JTREG tests passed without new failures.
> >>      >
> >>      > Time taken for pretouch on EPYC server with 1TB memory and 128
> >>     threads
> >>      > Before fix: ~107 s
> >>      > After fix   :  ~14 s
> >>      >
> >>      > Please review this attached patch and give your feedback.
> >>      >
> >>      > Thanks,
> >>      > Amit Pawar
> >>      >
> >>
> >>
> >>
> >> --
> >> With best regards,
> >> amit pawar
>


-- 
With best regards,
amit pawar


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