[infinispan-dev] Hash functions

[Manik Surtani]

On 31 Mar 2010, at 05:07, Jason T. Greene wrote:

> Jason T. Greene wrote:
>> Manik Surtani wrote:
>>> On 29 Mar 2010, at 10:30, Galder Zamarreno wrote:
>>> 
>>>> Manik,
>>>> 
>>>> If String's are dealt with by calling String.getBytes() which in 
>>>> turns  gets processed as a byte[], why is there such a big 
>>>> difference  SuperFastHash String speed and MurmurHash2 String speed 
>>>> (162 ms vs 56 ms)  but there's hardly any difference between the 
>>>> byte[] tests (29ms vs 40ms) ?
>>> 
>>> No idea.  Microbenchmarks are notoriously fickle though, I will try 
>>> and run this again over a larger sample size to smooth things out a bit.
>>> 
>> 
>> UTF-8 encoding. It has a cost.
>> 
>                           ^ measurable

Yes, but the cost shouldn't be different when used with different hash functions.  :)

--
Manik Surtani
manik at jboss.org
Lead, Infinispan
Lead, JBoss Cache
http://www.infinispan.org
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