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From Nick Vasilyev <>
Subject Re: Solr 5.2.1 on Java 8 GC
Date Sun, 01 May 2016 17:08:43 GMT
How do you log GC frequency and time to compare it with other GC

Also, do you tweak parameters automatically or is there a set of
configuration that get tested?

Lastly, I was under impression that G1 is not recommended to be used based
on some issues with Lucene, so I haven't tried it. Are you guys seeing any
significant performance benefits with it and Java 8? Any issues?
On May 1, 2016 12:57 PM, "Bram Van Dam" <> wrote:

> On 30/04/16 17:34, Davis, Daniel (NIH/NLM) [C] wrote:
> > Bram, on the subject of brute force - if your script is "clever" and
> uses binary first search, I'd love to adapt it to my environment.  I am
> trying to build a truly multi-tenant Solr because each of our indexes is
> tiny, but all together they will eventually be big, and so I'll have to
> repeat this experiment, many, many times.
> Sorry to disappoint, the script is very dumb, and it doesn't just
> start/stop Solr, it installs our application suite, picks a GC profile
> at random, indexes a boatload of data and then runs a bunch of query tests.
> Three pointers I can give you:
> 1) beware of JVM versions, especially when using the G1 collector, it
> behaves horribly on older JVMs but rather nicely on newer versions.
> 2) At the very least you'll want to test the G1 and CMS collectors.
> 3) One large index vs many small indexes: the behaviour is very
> different. Depending on how many indexes you have, it might be worth to
> run each one in a different JVM. Of course that's not practical if you
> have thousands of indexes.
>  - Bram

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