On Mon, 2015-08-24 at 03:17 -0700, Pavel Hladik wrote: > It seems that most elements are really on 31G, but can we say that Solr > application is used like a number of elements from this result?
Fortunately Solr uses a lot of bit packing, which often translates to arrays of longs, which take up the same amount of heap independent of pointer size. On the other hand, Solr also uses HashMaps for some of the requests (faceting on numerics, if I remember correctly), so if an application is a heavy user of that, the large pointer effect would be even more pronounced than for a LinkedList. It would be great if someone with a bit of time did some experiments with Solr on this issue. Locally we side step it a bit as we are able to get by with a 30GB heap for our largest installation and do not need more than 10GB for the rest. - Toke Eskildsen, State and University Library, Denmark
