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From Li Li <fancye...@gmail.com>
Subject Re: instantiated contrib
Date Fri, 27 Aug 2010 03:34:00 GMT
if I index only 7k documents, the time comparison:
time1: 7602331019 time2: 4246878035 total1: 10736 total2: 7393
it seems II is faster than RAMDirectory.

My indexed texts are all hotel names (chinese and english, litter french).
it has about 100k terms. terms such as hotel is very frequent and
hotel name is very rare(exception Hotel Chain).
so I guess it's distribution is a litter term is very frequent and
other term is very rare.

2010/8/27 Karl Wettin <karl.wettin@gmail.com>:
> My mail client died while sending this mail.. Sorry for any duplicate.
>
> It is strange that it should take 20 second to gather fields, this is the
> only thing that really suprises me. I'd expect it to be instant compared to
> RAMDirectory. It is hard to say from the information you provided. Did you
> perhaps lazy load field values from your RAMDirectory and not retrieve them,
> or something like that?
>
> Why your queries are slow is also hard to say, there can be many reaons. 70k
> documents can be quite a few documents for II if they contain enough text.
> Here are a few questions that may or may not be helpful:
>
> What is the content of the documents? Do they contain a lot of the same
> text? Or are they all rather unique? The major thing that makes II faster
> than RAMDirectory is that it does not have to deserialize values from the
> bytestream. As the index grows binary searching for documents containing a
> given term will start consume more time than deserializing the index.
>
> What speed do you see if you only load 10% (7k)?
>
> Did you see the graphics in the package level javadocs?
> http://lucene.apache.org/java/3_0_2/api/all/org/apache/lucene/store/instantiated/package-summary.html
>
>
>        karl
>
>
> 26 aug 2010 kl. 09.24 skrev Li Li:
>
>> I have about 70k document, the total indexed size is about 15MB(the
>> orginal text files' size).
>>               dir=new RAMDirectory();
>>               IndexWriter write=new IndexWriter(dir,...;
>>               for(loop){
>>                    writer.addDocument(doc);
>>               }
>>        writer.optimize();
>>        writer.close();
>>
>>        IndexReader ir=IndexReader.open(dir,true);
>>        InstantiatedIndex ii=new InstantiatedIndex(ir);
>>        InstantiatedIndexReader iir=new InstantiatedIndexReader(ii);
>>        is=new IndexSearcher(ir);
>>        is2=new IndexSearcher(iir);
>>
>>             I calculate the time by:
>>        long searchStart=System.nanoTime();
>>        TopDocs docs=is.search(bQuery,Integer.MAX_VALUE);
>>        long searchEnd=System.nanoTime();
>>
>>            I searched 10,000 documents and the time of RAMDirectory
>> and instantiated
>>            the time used is time1: 21s(21812978000 ns) time2:
>> 20s(20713817000 ns)
>>            I also calulate the time including get field value:
>>               total1: 23852ms total2: 22610ms
>>           it seems instantiated is not much faster than
>> RAMDirectory. Is there any thing wrong I used? my max memory is 4GB
>>
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>
>
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