Thanks Jeff. On Fri, Aug 31, 2018 at 1:01 PM Jeff Jirsa <jji...@gmail.com> 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.muel...@smartthings.com.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.muel...@smartthings.com> > > wrote: > > > >> Oh nice, I'll check that out. > >> > >> On Thu, Aug 30, 2018 at 11:07 AM Jonathan Haddad <j...@jonhaddad.com> > >> 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.muel...@smartthings.com.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 > >>> > >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@cassandra.apache.org > For additional commands, e-mail: dev-h...@cassandra.apache.org > >
