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Re: Java 11 Z garbage collector


Thanks Jeff.

On Fri, Aug 31, 2018 at 1:01 PM Jeff Jirsa <jjirsa@xxxxxxxxx> wrote:

> Read heavy workload with wider partitions (like 1-2gb) and disable the key
> cache will be worst case for GC
>
>
>
>
> --
> Jeff Jirsa
>
>
> > On Aug 31, 2018, at 10:51 AM, Carl Mueller <carl.mueller@xxxxxxxxxxxxxxx.INVALID>
> wrote:
> >
> > I'm assuming that p99 that Rocksandra tries to target is caused by GC
> > pauses, does anyone have data patterns or datasets that will generate GC
> > pauses in Cassandra to highlight the abilities of Rocksandra (and...
> > Scylla?) and perhaps this GC approach?
> >
> > On Thu, Aug 30, 2018 at 8:11 PM Carl Mueller <
> carl.mueller@xxxxxxxxxxxxxxx>
> > wrote:
> >
> >> Oh nice, I'll check that out.
> >>
> >> On Thu, Aug 30, 2018 at 11:07 AM Jonathan Haddad <jon@xxxxxxxxxxxxx>
> >> wrote:
> >>
> >>> Advertised, yes, but so far I haven't found it to be any better than
> >>> ParNew + CMS or G1 in the performance tests I did when writing
> >>> http://thelastpickle.com/blog/2018/08/16/java11.html.
> >>>
> >>> That said, I didn't try it with a huge heap (i think it was 16 or
> 24GB),
> >>> so
> >>> maybe it'll do better if I throw 50 GB RAM at it.
> >>>
> >>>
> >>>
> >>> On Thu, Aug 30, 2018 at 8:42 AM Carl Mueller
> >>> <carl.mueller@xxxxxxxxxxxxxxx.invalid> wrote:
> >>>
> >>>> https://www.opsian.com/blog/javas-new-zgc-is-very-exciting/
> >>>>
> >>>> .. max of 4ms for stop the world, large terabyte heaps, seems
> promising.
> >>>>
> >>>> Will this be a major boon to cassandra p99 times? Anyone know the
> >>> aspects
> >>>> of cassandra that cause the most churn and lead to StopTheWorld GC? I
> >>> was
> >>>> under the impression that bloom filters, caches, etc are statically
> >>>> allocated at startup.
> >>>>
> >>>
> >>>
> >>> --
> >>> Jon Haddad
> >>> http://www.rustyrazorblade.com
> >>> twitter: rustyrazorblade
> >>>
> >>
>
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