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From Doug Cutting <>
Subject Re: Ferret's changes
Date Tue, 10 Oct 2006 20:28:00 GMT
David Balmain wrote:
> The start of my benchmarks are here:

Ferret looks fast!  Nice work.

A big knee in indexing performance occurs when indexes get much larger 
than memory, when merging requires a lot of disk i/o.  In these cases 
the algorithm can matter more than its implementation.  (The 
implementation only needs to be fast enough so that i/o dominates.) 
Would you expect Ferret to perform markedly differently than Lucene Java 
when updating, e.g., 50GB indexes on a machine with 512MB of RAM?

Lots of indexes are smaller than memory and their updates don't require 
a lot of disk i/o.  It's important to be fast in that case too, and your 
benchmarks show Ferret doing quite well there.


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