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From "Uwe Schindler" <...@thetaphi.de>
Subject RE: Slowness on Java 11 with Lucene 6
Date Mon, 29 Jul 2019 16:48:33 GMT
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: uwe@thetaphi.de

> -----Original Message-----
> From: GASPARD-EXT Joel <joel.gaspard-ext@fnacdarty.com>
> 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 200000 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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