Since its too long (and has too much HTML and pictures and such forth) for the mailing list I have a more detailed write up here
http://people.apache.org/~gbowyer/madvise-perf/index.html However the short version. At $DAYJOB as part of moving to lucene 4.0 I have been looking at what we can change in our modes of thinking, on of these relates (for us) to having a separate legacy system that serves the stored data for the search engine (which we imaginatively call docserve). Whilst playing with this I noticed that I lost a lot of performance rather quickly, after a lot of digging it looks like getting a call in mmaping to madvise (specifically a call of the form madvise(addr, MADV_WILLNEED) might improve search performance. Anyone have any thoughts and or ideas here, I am going to try to get a whole heap more investigation done before I start messing with lucene's behavior on mmap (because whilst it improves /my/ performance a lot it might be I only noticed it since I am poking an open-wound YMMV), but there is something of interest here. Then again this might be my own personal insanity .. :S -- Greg --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org
