On Tue, Oct 14, 2008 at 4:29 PM, Feak, Todd <[EMAIL PROTECTED]> wrote: > In our load testing, the limit for utilizing all of the processor time > on a box was locking (synchronize, mutex, monitor, pick one). There were > a couple of locking points that we saw. > > 1. Lucene's locking on the index for simultaneous read/write protection. > 2. Solr's locking on the LRUCaches for update protection.
Luckily, both of these are very close to being improved: 1. Lucene 2.4 has NIO support (lockless) except for Windows, and there is already a Solr patch to add support for that. 2. Solr already has a patch (soon to be committed) for an LRUCache based on ConcurrentHashMap that should work better with multiple CPUs. -Yonik
