A must read when you are considering this is here: http://blog.thetaphi.de/2012/07/use-lucenes-mmapdirectory-on-64bit.html
Best Erick On Sat, Jun 1, 2013 at 8:56 AM, Ramkumar R. Aiyengar <andyetitmo...@gmail.com> wrote: > In general, just increasing the cache sizes to make everything fit in > memory might not always give you best results. Do keep in mind that the > caches are in Java memory and that incurs the penalty of garbage collection > and other housekeeping Java's memory management might have to do. > > Reasonably recent Solr distributions should default to memory mapping your > collections on most platforms. What that means is that if you have > sufficient free memory available on your server for the operating system to > use, it would do the caching for you and that invariably ends up being much > better in terms of performance. From that angle, its preferable to keep the > caches as small as possible so that the OS has more to cache. > > That said, as always, YMMV. The ultimate test in all this is to try it out > yourself with various configurations and see the performance differences > for yourself. > On 1 Jun 2013 01:34, <alx...@aim.com> wrote: > >> Hello, >> >> I have a solr index of size 5GB. I am thinking of increasing cache size >> to 5 GB, expecting Solr will put whole index into memory. >> >> 1. Will Solr indeed put whole index into memory? >> 2. What are drawbacks of this approach? >> >> Thanks in advance. >> Alex. >>
