Re: [htdig-dev] Improving speed of htdig on mac os x

[Neal R. <ne...@ri...>]

On Tue, 26 Jul 2005, Gustave T. Stresen-Reuter wrote:

> One way to improve the speed of htdig on mac os x is to take advantage 
> of the AltiVec processor. I don't know anything about how to do this, 
> but in reading some documentation I ran across a document says that 
> "Existing C code written for serial execution" can take advantage of 
> the AltiVec processor.
> 
> If someone on the list knows whether or not the htdig source contains 
> "C code written for serial execution" and can point me to it, I can 
> explore what would be needed to get the code to take advantage of the 
> processor.

  I'll look into this a bit more.  HtDig does essentially nothing in 
parallel..

  My initial look is that the code has to be instrumented to do much with 
altivec:

  
http://developer.apple.com/documentation/DeveloperTools/gcc-4.0.0/gcc/PowerPC-AltiVec-Built_002din-Functions.html

  There are definetly a few vector operations in htdig w.r.t word vectors, 
however they are not really the type of thing that AltiVec would help with 
at first glance.

  I would think some speedup could be had in htsearch during the 
index-row-hit summarization.


Thanks

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Neal Richter
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