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From "Jeff Rodenburg" <>
Subject Re: noobie question
Date Fri, 19 May 2006 16:01:43 GMT
Hi Pamela -

Performance certainly changes as your index grows, and it's not even
necessarily a linear progression.  How you indexed your data, compression
factors, compound vs. loose file format, number of indexes, etc. all play a
part in affecting search performance at runtime.

There are a lot of places to look for improvements.  I would suggest looking
at your specific indexes and see if you can break those up into smaller
indexes -- this will lead you to the MultiSearcher (and, if you have
multi-processor hardware, ParallelMultiSearcher).

Leave your index updating operation out of the picture for the moment.
Indexing can have a big impact on search performance, so take that out of
the equation.  After you're able to get to better runtime search
performance, go back and add indexing to the mix.  I can tell you from
experience that most search systems with indexes of substantial size are
executing indexing operations on separate systems to avoid performance

Hope this helps.

-- j

On 5/19/06, Pamela Foxcroft <> wrote:
> I have been developing a C# search solution for an application which has
> tens of millions of web pages. Most of these web pages are under 1 k.
> While our initial pilot was very encouraging on our tests of 1,000,000
> docs,
> when we scaled up to 10 million subsecond searches are now taking 8-10
> seconds.
> Where should I focus my efforts to increase search speed? Should I be
> using
> the RAMDirectory? MultiSearcher?
> We only have one machine right now which serves indexing and searching.
> Pam

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