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From Yang <teddyyyy...@gmail.com>
Subject Re: lucene (search) performance tuning
Date Sat, 26 May 2012 00:47:51 GMT
thanks a lot guys

On Tue, May 22, 2012 at 1:34 AM, Ian Lea <ian.lea@gmail.com> 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 <fancyerii@gmail.com> 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" <fancyerii@gmail.com>写道:
> >>
> >>
> >> 在 2012-5-22 凌晨4:59,"Yang" <teddyyyy123@gmail.com>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
> >> >
> >> >
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