On 5/1/2018 5:33 PM, Greenhorn Techie wrote: > Wondering what are the considerations to be aware to arrive at an optimal > heap size for Solr JVM? Though I did discuss this on the IRC, I am still > unclear on how Solr uses the JVM heap space. Are there any pointers to > understand this aspect better?
I'm one of the people you've been chatting with on IRC. I also wrote the wiki page that Susheel has recommended to you. > Given that Solr requires an optimally configured heap, so that the > remaining unused memory can be used for OS disk cache, I wonder how to best > configure Solr heap. Also, on the IRC it was discussed that having 31GB of > heap is better than having 32GB due to Java’s internal usage of heap. Can > anyone guide further on heap configuration please? With the index size you mentioned on IRC, it's very difficult to project how much heap you're going to need. Actually setting up a system, putting data on it, and firing real queries at it may be the only way to be sure. The only concrete advice I can give you with the information available is this: Install as much memory as you can. It is extremely unlikely that you would ever have too much memory when you're dealing with terabyte-scale indexes. Heavy indexing (which you have mentioned as a requirement in another thread) will tend to require a larger heap. Thanks, Shawn
