On 3/18/22 12:35, Vincenzo D'Amore wrote:
The INDEX.size is 70GB, what do you think if I raise the size allocated from the JVM to 64GB in order to have the index in memory?
Solr and Java do not put the index into memory. The OS does. If you raise the heap size, there will be LESS memory available for caching the index.
The advice to use a 31GB heap is because as soon as the max heap size hits 32GB, Java switches from 32 bit pointers to 64 bit pointers. Specifying a 32GB heap actually means the program will get LESS memory than a max heap of 31GB. I once researched it (not very deeply), and I think the break-even point for software like Solr doesn't occur until the heap size is well beyond 40GB. So in many cases, 31GB is a better setting.
Thanks, Shawn
