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Subject: Re: 32bit hashing signature

Author: Steve Maughan

Date: 03:45:48 04/16/01

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Tony,

>The best way IMO is to use 64bit, use fe the right 18 bit for indexing, shift
>the hashnumber 18 to the rigth and store the right 32 bit (the signature). You
>are then using a 50 bit hashnumber but you only store 32 of them.

I store the whole 64 bits.  I thought about trying your method but is it really
worth it?  What happens when you need to change the hash table size?  What
happens when you only have a limited amount of memory i.e. small hash table
size?  The hash signature will reduce.  I guess you save a little on bandwidth
but is it significant?  Has anyone done any tests?

Regards,

Steve



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