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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Trivial Update of "SolrPerformanceProblems" by ShawnHeisey
Date Fri, 14 Oct 2016 12:30:07 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=64&rev2=65

Comment:
Minor cleanup on the section just added.

  
  If you let your Solr server run with a high query and update load, the low points in the
sawtooth pattern will represent the absolute minimum required memory.  Try setting your max
heap between 125% and 150% of this value, then repeat the monitoring to see if the low points
in the sawtooth pattern are noticeably higher than they were before, or if the garbage collections
are happening very frequently.  If they are, repeat the test with a higher max heap.
  
- Additional rule of thumb:  More heap is '''''usually''''' better, but if you make it too
big, the amount of time spent doing garbage collection can become extreme, and as already
discussed, dropping the size of the OS disk cache can create more problems.
+ Additional rule of thumb:  More heap is '''''usually''''' better, but if you make it too
big, the amount of time spent doing garbage collection can become extreme.  That problem will
be discussed below.  Also, as discussed above, dropping the size of the OS disk cache can
create more problems.
  
  ==== Reducing heap requirements ====
  

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