The price-performance knee for small servers is 32G ram, 2-6 SATA disks on a raid, 8/16 cores. You can buy these servers and half-fill them, leaving room for expansion.
I have not done benchmarks about the max # of processors that can be kept busy during indexing or querying, and the total numbers: QPS, response time averages & variability, etc. If your index file size is 8G, and your Java heap is 8G, you will do long garbage collection cycles. The operating system is very good at keeping your index in memory- better than Solr can. Lance On Mon, Aug 30, 2010 at 4:52 PM, Amit Nithian <anith...@gmail.com> wrote: > Hi all, > > I am curious to know get some opinions on at what point having more CPU > cores shows diminishing returns in terms of QPS. Our index size is about 8GB > and we have 16GB of RAM on a quad core 4 x 2.4 GHz AMD Opteron 2216. > Currently I have the heap to 8GB. > > We are looking to get more servers to increase capacity and because the > warranty is set to expire on our old servers and so I was curious before > asking for a certain spec what others run and at what point does having more > cores cease to matter? Mainly looking at somewhere between 4-12 cores per > server. > > Thanks! > Amit > -- Lance Norskog goks...@gmail.com
