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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "SolrPerformanceProblems" by ShawnHeisey
Date Mon, 24 Aug 2015 23:15:03 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for change notification.

The "SolrPerformanceProblems" page has been changed by ShawnHeisey:
https://wiki.apache.org/solr/SolrPerformanceProblems?action=diff&rev1=51&rev2=52

Comment:
add detail to "gc tuning will not reduce heap" warning.

  
  ==== Reducing heap requirements ====
  
- /!\ Tuning your garbage collection parameters will '''''NOT''''' reduce the amount of memory
that Solr requires!  It ''might'' make reclaiming memory more efficient, but it can do absolutely
nothing to lower the amount of memory that the program needs.
+ /!\ Tuning your garbage collection parameters will '''''NOT''''' reduce the amount of memory
that Solr requires!  It ''might'' make reclaiming memory more efficient, but it can do absolutely
nothing to lower the amount of memory that the program needs.  It might make the high points
in the sawtooth memory graph lower, but it won't do anything about the low points.  If you
are running into an OutOfMemoryError exception, a change to GC tuning will not help at all.
  
  Here is an incomplete list, in no particular order, of how to reduce heap requirements,
based on the [[SolrPerformanceProblems#Java_Heap|list above]] for things that require a lot
of heap:
  

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