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From Petite Abeille <petite_abei...@mac.com>
Subject Re: SOC: Lulu, a Lua implementation of Lucene
Date Sat, 01 Mar 2008 08:21:55 GMT
Hi Marvin,

On Mar 1, 2008, at 2:33 AM, Marvin Humphrey wrote:

> How fast is Lua's method dispatch, compared to Java's?

Fast enough.

http://luajit.org/luajit_performance.html

>  That has a huge impact on performance, since *everything* is a  
> method in Lucene -- down to writeByte().

The plan is not to mimic Lucene's Java implementation, but rather it's  
file format and query syntax:

http://lucene.apache.org/java/2_3_1/fileformats.html
http://lucene.apache.org/java/2_3_1/queryparsersyntax.html

> There have been several attempts at pure dynamic language ports of  
> Lucene, including Plucene (Perl), Lupy (Python), and the original  
> pure-Ruby implementation of Ferret.  All of those have proven  
> unacceptably slow.  The ports which have achieved good performance,  
> including CLucene (C++), Lucene.NET, the latter-day Ferret (C/Ruby),  
> and KinoSearch (C/Perl) (and possibly others, I haven't reviewed  
> them all) all get close to the metal.  None rely on hash-based  
> method dispatch for inner-loop code, and all manipulate primitive  
> types directly.

Thanks for the head up :)

Cheers,

PA.


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