Hi,
We did not notice any slowdown with queries based on Java version, if the
configuration is identical.
But Java 11 uses G1GC as default garbage collector, in contrast to Java 8 which
uses ParallelGC as garbage collector. G1GC has no longer pause times anymore
(so you application won't halt anymore for longer time), but in contrast it
slows down the throughput.
If you use Solr or Elasticsearch, those applications configure the garbage
collector for use with search, but if you just run your application with Java 8
and default command line parameters, slowdowns due to different defaults may be
possible.
I'd suggest to make sure that the garbage collector is configured in a defined
way and then compare again. We also don't know on the mailing list what you
have done (is it pure Lucene, is it Solr, or is it Elasticsearch?) and how your
JVM is configured. So assumed the worst case (default settings with pure Lucene
application).
Uwe
-
Uwe Schindler
Achterdiek 19, D-28357 Bremen
https://www.thetaphi.de
eMail: u...@thetaphi.de
> -Original Message-
> From: GASPARD-EXT Joel
> Sent: Monday, July 29, 2019 5:17 PM
> To: java-user@lucene.apache.org
> Subject: Slowness on Java 11 with Lucene 6
>
> Hello,
>
> We have noticed slower response times on search with Lucene 6 when
> upgrading to Java 11.
>
> We use the version 6.6.5 of Lucene. Our servers are on Windows, with SSD
> devices. Our index contains several millions of documents.
> When upgrading from Java 8 to Java 11, we have noticed slower response
> times in query searches : sometimes 30% slower, sometimes twice as slow,
> depending on the server capacity.
>
> We measure response times with 20 queries.
> We have made our tests with different JDK providers. We have noticed the
> same deviation.
>
> Have you encountered this problem ?
>
> Thanks
>
>
>
>
>
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