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From: Maulin Rathod <mrathod@asite.com>
To: "solr-user@lucene.apache.org" <solr-user@lucene.apache.org>
Subject: Solr Configuration (Caching & RAM) for performance Tuning
Thread-Topic: Solr Configuration (Caching & RAM) for performance Tuning
Thread-Index: AdF1Ei5JqfiAjNxRQM+o/QIFUNE3PA==
Date: Thu, 3 Mar 2016 06:09:09 +0000
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Hi,

We are using Solr 5.2 (on windows 2012 server/jdk 1.8) for document content=
 indexing/querying. We found that querying slows down intermittently under =
load condition.

In our analysis we found two issues.

1) Solr is not effectively using caching.

Whenever new document indexed, it opens new searcher and hence cache will b=
ecome invalid (as cache was associated with old Index Searcher). In our sce=
nario, new documents are indexed very frequently (at least 10 document are =
indexed per minute). So effectively cache will not be useful as it will ope=
n new searcher frequently to make new documents available for searching. Ho=
w can improve caching usage?


2) RAM is not utilized

We observed that Solr is using only 1-2 GB of heap even though we have assi=
gn 50 GB. Seems like it is not loading index into RAM which leads to high I=
O. Is it possible to configure Solr to fully load indexes in memory?  Don't=
 find any documentation about this. How can we increase RAM usage to improv=
e Solr performance?


Regards,

Maulin

[CC Award Winners 2015]


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