On Fri, 2010-09-03 at 11:07 +0200, Dennis Gearon wrote: > If you really want to see performance, try external DRAM disks. > Whew! 800X faster than a disk.
As sexy as they are, the DRAM drives does not buy much more extra performance. At least not at the search stage. For searching, SSDs are not that far from holding the index fully in RAM (about 3/4 the speed in our tests but YMMV). The CPU is the bottleneck. That was with Lucene 2.4 so the relative numbers might have changed, but the old lesson still stands: A well balanced system is key.
