On Wed, May 13, 2009 at 12:33 PM, Grant Ingersoll <gsing...@apache.org> wrote: > I've contacted > others in the past who have done "comparisons" and after one round of > emailing it was almost always clear that they didn't know what best > practices are for any given product and thus were doing things > sub-optimally.
While I agree, one should properly match & tune all apps they are testing (for a fair comparison), we in turn must set out-of-the-box defaults (in Lucene and Solr) that get you as close to the "best practices" as possible. We don't always do that, and I think we should do better. My most recent example of this is BooleanQuery's performance. It turns out, if you setAllowDocsOutOfOrder(true), it yields a sizable performance gain (27% on my most recent test) for OR queries. So why haven't we enabled this by default, already? (As far as I can tell it's functionally equivalent, as long as the Collector can accept out-of-order docs, which our core collectors can). We can't expect the "other camp" to discover that this obscure setting must be set, to maximize Lucene's OR query performance. Mike
