thanks a lot guys On Tue, May 22, 2012 at 1:34 AM, Ian Lea <[email protected]> wrote:
> Lots of good tips in > http://wiki.apache.org/lucene-java/ImproveSearchingSpeed, linked from > the FAQ. > > > -- > Ian. > > > On Tue, May 22, 2012 at 2:08 AM, Li Li <[email protected]> wrote: > > something wrong when writing in my android client. > > if RAMDirectory do not help, i think the bottleneck is cpu. you may try > to > > tune jvm but i do not expect much improvement. > > the best one is splitting your index into 2 or more smaller ones. > > you can then use solr s distributed searching. > > if the cpu is not fully used, yuo can do this in one physical machine > > > > 在 2012-5-22 上午8:50，"Li Li" <[email protected]>写道： > >> > >> > >> 在 2012-5-22 凌晨4:59，"Yang" <[email protected]>写道： > >> > >> > > >> > I'm trying to make my search faster. right now a query like > >> > > >> > name:Joe Moe Pizza address:77 main street city:San Francisco > >> >is this a conjunction query or a disjunction query？ > >> > >> > in a index with 20mil such short business descriptions (total size > > about 3GB) takes about 100--200ms. > >> >20m is not a small size, how many results for a query in average？ > >> > >> > I profiled the query, most time is spent in TermScorer.score(), as is > > shown by the attached yourkit screenshot. > >> >that＇s true, for a query, matching and scoring is very time consuming > > and cpu intensive. another one is io for reading postings. > >> > >> > > >> > > >> > > >> > I tried loading the index onto tmpfs (in-memory block device), and > also > > tried RAMDirectory, neither helps much. > >> >if that is true. it seems that io is not the > >> > I am reading > > http://www.cnlp.org/presentations/slides/AdvancedLuceneEU.pdf > >> > it mentions > >> > Size > >> > – Stopword removal > >> > – Stemming > >> > • Lucene has a number of stemmers available > >> > • Light versus Aggressive > >> > • May prevent fine-grained matches in some cases > >> > – Not a linear factor (usually) due to index compression > >> > > >> > so for "stopword removal", I'm already using the standard analyzer, so > > stop word removal is already included, right? > >> > > >> > also generally any other tricks to try for reducing the search > latency? > >> > > >> > Thanks! > >> > Yang > >> > > >> > > >> > --------------------------------------------------------------------- > >> > To unsubscribe, e-mail: [email protected] > >> > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > >
