> On Dec 6, 2018, at 12:59 AM, Bernd Fehling <bernd.fehl...@uni-bielefeld.de> > wrote: > > Am 05.12.18 um 17:11 schrieb Walter Underwood: >> I’ve never heard a recommendation to have three times as much RAM as the >> heap. That doesn’t make sense to me. > > https://wiki.apache.org/solr/SolrPerformanceProblems#RAM > <https://wiki.apache.org/solr/SolrPerformanceProblems#RAM>
Thanks. That does not say to use 3X the RAM. In fact, it recommends the approach I gave, size the RAM by looking at the needs of Solr and other programs. It does not mention the OS and file buffers, which is a serious omission. "Let's say that you have a Solr index size of 8GB. If your OS, Solr's Java heap, and all other running programs require 4GB of memory, then an ideal memory size for that server is at least 12GB. […] It's very important to note here that there is no quick formula available for deciding the minimum amount of memory required for good performance." wunder Walter Underwood wun...@wunderwood.org http://observer.wunderwood.org/ (my blog)
