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Subject [GitHub] [lucenenet] NightOwl888 commented on issue #333: Why is there a drastic difference in search time between lucenenet in c# and lucene in java while the other statistics are roughly comparable?
Date Wed, 02 Sep 2020 08:45:50 GMT

NightOwl888 commented on issue #333:
URL: https://github.com/apache/lucenenet/issues/333#issuecomment-685451453


   Without seeing your test, there is not a lot I can tell you. You didn't even mention what
versions of Lucene/Lucene.NET you are testing. Of course, the only apples to apples way to
test this would be either to run:
   
   - Lucene.NET 3.0.3 against its closest counterpart in Lucene, 3.0.1
   - Lucene.NET 4.8.0 against Lucene 4.8.0
   
   Since Lucene 4.8.0 was designed to run with Java 6, you would also need to get a copy of
a Java 6 runtime to run it on. And since Java 6 is not available for download from any official
source anymore, I strongly suspect you are not doing either of these exact version tests on
the version of Java it was designed to run on.
   
   Do note that we have recently [set up benchmarks](https://github.com/apache/lucenenet/pull/310)
across each of the betas, and we have approximately doubled search performance since 4.8.0-beta00007,
so if you are testing on an older beta you will definitely see performance degradation.
   
   Of course, it is possible you have stumbled upon a severe bottleneck in a specific Analyzer,
Tokenizer, Codec, Query, or other component, but again, without seeing the code there isn't
much we can do. Could you post this POC somewhere in a form where it can be *run* in both
Java and .NET without too much extra configuration, and some setup instructions to get it
up and running?


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