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List:       lucene-user
Subject:    Re: Unable to improve performance
From:       Paul Taylor <paul_t100 () fastmail ! fm>
Date:       2009-03-27 16:06:42
Message-ID: 49CCF992.4020702 () fastmail ! fm
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Michael McCandless wrote:
> Are you opening your IndexReader with readOnly=true?  If not, you're
> likely hitting contention on the "isDeleted" method.
>
> When you run with a "normal" directory, either on a traditional hard
> drive or SSD device, do you use NIOFSDirectory?  That removes
> contention, but, it only works on non-Windows platform due to a
> long-standing bug in Sun's JRE.
>   
It was a long lunch, actually Im just creating an IndexSearcher directly 
on a file

i.e Searcher searcher = new IndexSearcher(indexDir + "/track_index");

I was struggling to see how to create an NIOFSDirectory until I realised 
I needed Lucene 2.9, which Ive done as follows

Searcher searcher = new IndexSearcher(IndexReader.open(new 
NIOFSDirectory(new File(indexDir + "/track_index"),null),true)));

Anyway the end result is query times have been reduced from 43 seconds 
to 23 seconds, so a pretty good result. (although I dont really 
understand why the RAMDirectory method didnt perform at least this well 
because it would have no file io contention)

thanks alot Paul


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