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<title>[LUCENENET-647] Performance decreasement migrating from 3.0.3 to 4.8.0</title>
<link>https://issues.apache.org/jira/browse/LUCENENET-647</link>
<project id="12310290" key="LUCENENET">Lucene.Net</project>
<description><p>Hello,</p>
<p>I'm currently migrating a project, that uses Lucene.Net, from .Net Framework to .Net Core.</p>
<p>I had to migrate from 3.0.3 version of Lucene to 4.8.0 (beta0007) but I noticed performance decreasement while measuring response time while requesting the database. The response time using Lucene 4.8.0 is two to three times higher than 3.0.3 version.</p>
<p>I read some forum topics where other users noticed this performance decreasement too. Are you aware about that? Do you plan to do something to improve performances of Lucene 4.8.0?</p>
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<key id="13289840">LUCENENET-647</key>
<summary>Performance decreasement migrating from 3.0.3 to 4.8.0</summary>
<type id="4" iconUrl="https://issues.apache.org/jira/secure/viewavatar?size=xsmall&avatarId=21140&avatarType=issuetype">Improvement</type>
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<reporter username="Mo Dje">Mo Dje</reporter>
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<created>Thu, 5 Mar 2020 22:21:40 +0700</created>
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<comment id="17052307" author="eladmarg" created="Thu, 5 Mar 2020 23:24:50 +0700" ><p>I faced the same performance degradation. <br/>
<a href="https://issues.apache.org/jira/secure/ViewProfile.jspa?name=nightowl888" class="user-hover" rel="nightowl888">Shad Storhaug</a> , I saw some commits on this issue, any chance to release newer beta?</p></comment>
<comment id="17052367" author="eladmarg" created="Fri, 6 Mar 2020 00:30:02 +0700" ><p>maybe its because of compression by default.<br/>
<a href="https://stegard.net/2015/05/performance-of-stored-field-compression-in-lucene-4-1/" class="external-link" rel="nofollow">https://stegard.net/2015/05/performance-of-stored-field-compression-in-lucene-4-1/</a></p></comment>
<comment id="17053242" author="mo dje" created="Fri, 6 Mar 2020 17:06:13 +0700" ><p>Yes I read this article. There is a little improvement by doing the hack presented in this article but there is still a serious gap with the previous version in terms of response time.</p></comment>
<comment id="17054750" author="nightowl888" created="Mon, 9 Mar 2020 15:42:32 +0700" ><p>Thanks for the report.</p>
<p>However, without more information there isn't much we can do on our end. Specifically, what is slow? Searching, indexing, analyzing?</p>
<p>Without seeing some code, it is hard to put together any advice on what to do about it. Could you please provide a sample configuration that runs fast in Lucene.NET 3.0.3 and is measurably slower when running with Lucene.NET 4.8.0?</p>
<p>Also, can you please confirm you are using 4.8.0-beta00007? It has several performance improvements over the previous betas.</p>
<p><a href="https://issues.apache.org/jira/secure/ViewProfile.jspa?name=eladmarg" class="user-hover" rel="eladmarg">Elad Margalit</a> - Yes, there are some additional performance improvements in the trunk that haven't been released yet. Most of them only apply to very specific configurations, though. I am hoping to eliminate the "Support" namespace on ICU4N before doing that release.</p></comment>
<comment id="17055736" author="mo dje" created="Tue, 10 Mar 2020 16:22:20 +0700" ><p><a href="https://issues.apache.org/jira/secure/ViewProfile.jspa?name=nightowl888" class="user-hover" rel="nightowl888">Shad Storhaug</a>, the slowness issue is for searching operation.</p>
<p>Here is an example of a piece of code used to do a search :</p>
<p>var queryBuilder = new QueryBuilder(new MyAnalyzer());</p>
<p>var scoreDocs = indexSearcher.Search(queryBuilder.CreateBooleanQuery(field, value), 1).ScoreDocs;</p>
<p>I confirm that I am using 4.8.0 beta00007.</p></comment>
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