On Wed, Nov 5, 2008 at 2:29 PM, Feak, Todd <[EMAIL PROTECTED]> wrote: > Yonik said something about the FastLRUCache giving the most gain for > high hit-rates and the LRUCache being faster for low hit-rates.
Right, for single-threaded requests. FastLRUCache has faster gets and slower puts (on average). How multi- The queryCache, which is typically only checked once per request, is likely to see little real contention under realistic scenarios. The documentCache could perhaps benefit from FastLRUCache, even with a lower hit ratio, when concurrency is higher. This is because it's checked more per request - the number of documents to return, and thus increases in concurrency may outweigh the slower put(). I have no idea what the crossover point would be though. aside: I just committed a little fix to SOLR_667 in the setting of the acceptableSize (it should normally be between the min and max). -Yonik
