Re: Java 11 Z garbage collector
Thanks Jeff. On Fri, Aug 31, 2018 at 1:01 PM Jeff Jirsa 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 > > > 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 > >> 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 > >>> 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 > >
Re: Java 11 Z garbage collector
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 > 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 > wrote: > >> Oh nice, I'll check that out. >> >> On Thu, Aug 30, 2018 at 11:07 AM Jonathan Haddad >> 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 >>> 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
Re: Java 11 Z garbage collector
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 wrote: > Oh nice, I'll check that out. > > On Thu, Aug 30, 2018 at 11:07 AM Jonathan Haddad > 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 >> 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 >> >
Re: Java 11 Z garbage collector
Oh nice, I'll check that out. On Thu, Aug 30, 2018 at 11:07 AM Jonathan Haddad 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 > 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 >
Re: Java 11 Z garbage collector
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 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
