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From Apache Wiki <>
Subject [Solr Wiki] Trivial Update of "SolrPerformanceProblems" by YonikSeeley
Date Sat, 26 Apr 2014 15:26:22 GMT
Dear Wiki user,

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The "SolrPerformanceProblems" page has been changed by YonikSeeley:

point to off-heap data structures to reduce java heap reqs

   * Reduce RAMBufferSizeMB.  The default in recent Solr versions is 100.
    * This value can be particularly important if you have a lot of cores, because a buffer
will be used for each core.
   * Don't use RAMDirectoryFactory - instead, use the default and install enough system RAM
so the OS can cache your entire index as [[SolrPerformanceProblems#OS_Disk_Cache|discussed
+  * Try [[|Heliosearch]], a Solr fork that features [[|Off-Heap
Filters]] and an [[|Off-Heap FieldCache]]
  ==== GC pause problems ====

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