DateAndTime hash was: Re: [squeak-dev] true hash

Eliot Miranda eliot.miranda at gmail.com
Thu May 10 17:05:26 UTC 2012


On Thu, May 10, 2012 at 6:21 AM, Paul DeBruicker <pdebruic at gmail.com> wrote:

> On 05/10/2012 04:21 AM, Nicolas Cellier wrote:
>
>> Sure, I already changed various Number>>hash and could as well change
>> Point hash to follow recommendations from Andres valloud book hashing
>> in smalltalk...
>>
>> Nicolas
>>
>
> DateAndTime>>#hash could be changed to :
>
> hash
>        ^ (jdn hashMultiply bitXor: seconds + offset asSeconds) bitXor:
> nanos
>
> which is 130x faster than whats currently in the image:
>
> hash
>        ^ self asUTC ticks hash
>
>
> The collision rate on the proposed hash function is 0.04% ( 4 per 10,000 )
>

Just doit.  Make that change.  If you don't have commit rights, commit it
to inbox.  please!




-- 
best,
Eliot
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