Thx guys for sharing your experiences with G1. Since I sent you my question about GC, we have updated the version of java. Always with CMS/java8 and updating from u9x to u201. Just with that, we observe a gain of 66% (150ms ==> 50ms of STW).... :)
We are planning a second tuning, this time with G1. Thanks. Le mar. 19 mars 2019 à 19:56, Durity, Sean R <sean_r_dur...@homedepot.com> a écrit : > My default is G1GC using 50% of available RAM (so typically a minimum of > 16 GB for the JVM). That has worked in just about every case I’m familiar > with. In the old days we used CMS, but tuning that beast is a black art > with few wizards available (though several on this mailing list). Today, I > just don’t see GC issues – unless there is a bad query in play. For me, the > data model/query construction is the more fruitful path to achieving > performance and reliability. > > > > Sean Durity > > > > *From:* Jon Haddad <j...@jonhaddad.com> > *Sent:* Tuesday, March 19, 2019 2:16 PM > *To:* user@cassandra.apache.org > *Subject:* [EXTERNAL] Re: Garbage Collector > > > > G1 is optimized for high throughput with higher pause times. It's great > if you have mixed / unpredictable workloads, and as Elliott mentioned is > mostly set & forget. > > > > ZGC requires Java 11, which is only supported on trunk. I plan on messing > with it soon, but I haven't had time yet. We'll share the results on our > blog (TLP) when we get to it. > > > > Jon > > > > On Tue, Mar 19, 2019 at 10:12 AM Elliott Sims <elli...@backblaze.com> > wrote: > > I use G1, and I think it's actually the default now for newer Cassandra > versions. For G1, I've done very little custom config/tuning. I increased > heap to 16GB (out of 64GB physical), but most of the rest is at or near > default. For the most part, it's been "feed it more RAM, and it works" > compared to CMS's "lower overhead, works great until it doesn't" and dozens > of knobs. > > I haven't tried ZGC yet, but anecdotally I've heard that it doesn't really > match or beat G1 quite yet. > > > > On Tue, Mar 19, 2019 at 9:44 AM Ahmed Eljami <ahmed.elj...@gmail.com> > wrote: > > Hi Folks, > > > > Does someone use G1 GC or ZGC on production? > > > > Can you share your feedback, the configuration used if it's possible ? > > > > Thanks. > > > > > ------------------------------ > > The information in this Internet Email is confidential and may be legally > privileged. It is intended solely for the addressee. Access to this Email > by anyone else is unauthorized. If you are not the intended recipient, any > disclosure, copying, distribution or any action taken or omitted to be > taken in reliance on it, is prohibited and may be unlawful. When addressed > to our clients any opinions or advice contained in this Email are subject > to the terms and conditions expressed in any applicable governing The Home > Depot terms of business or client engagement letter. The Home Depot > disclaims all responsibility and liability for the accuracy and content of > this attachment and for any damages or losses arising from any > inaccuracies, errors, viruses, e.g., worms, trojan horses, etc., or other > items of a destructive nature, which may be contained in this attachment > and shall not be liable for direct, indirect, consequential or special > damages in connection with this e-mail message or its attachment. > -- Cordialement; Ahmed ELJAMI
