[Haskell-cafe] MD5? (was: Haskell performance question)

Andrew Coppin andrewcoppin at btinternet.com
Thu Nov 8 17:14:42 EST 2007

Don Stewart wrote:
> dpiponi:
>> I was getting about 1.5s for the Haskell program and about 0.08s for
>> the C one with the same n=10,000,000.
> I'm sure we can do better than that!
That's the spirit! :-D

Speaking of which [yes, I'm going to totally hijack this thread now...], 
does anybody have a Haskell MD5 hash implementation that goes fast? 
IIRC, I found one in MissingH, and it worked great. Except that as soon 
as you feed it a 10 MB file, the standard Unix "md5sum" executable takes 
about 0.001s to do it, and the Haskell version goes crazy and starts 
eating virtual memory like candy. o_O (Although given a few minutes it 
*does* produce the correct answer. But given that I want to run it over 
an entire CD......)

Given the choise, I'd *like* to find a fast 100% Haskell implementation 
- but failing that, (nice) bindings to a fast C implementation will do I 
guess. (I *only* need to compute MD5 hashes for files on disk. I don't 
need to do anything more fancy than that...)

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