[Haskell-cafe] How to benckmark a Word64 -> Bool?

[Alois Cochard]

Hi Charles,

I had in mind comparing with similar tool the C version, but it looks like
I was a bit naive at thinking that same tooling exist for C (after googling
a bit it sounds there is no lib like that).
OTOH, Bryan O'Sullivan mention in his original blog past about criterion
that it could be potentially used to benchmark C code as well.

The cost of putting that in place might outperform the benefit though.

Cheers

Alois



On 19 February 2014 18:49, Charles-Pierre Astolfi <cpa at crans.org> wrote:

> Switching to quotRem gave no measurable improvements.
> After switching to ByteString, the code now runs in 9 seconds, which
> outperforms my C version. But honestly, I have no idea why.
>
> New code:
> http://lpaste.net/100136
>
> $ ghc --make -O3 303only012.hs && time ./303only012 50000000 > /dev/null
> ./303only012 50000000 > /dev/null  9.72s user 0.21s system 90% cpu 10.961
> total
>
> @Alois, I'm not sure how criterion can help compare my code with the C
> version, since in the C version I cannot measure the exec time of only012
> only. What did you have in mind?
>
> Thanks everyone!
>
>
> --
> Cp
>
>
> On Wed, Feb 19, 2014 at 7:24 PM, Levent Erkok <erkokl at gmail.com> wrote:
>
>> Also, prefer quotRem over divMod as the former is faster. See here:
>> http://stackoverflow.com/questions/339719/when-is-the-difference-between-quotrem-and-divmod-useful
>>
>>
>> On Wed, Feb 19, 2014 at 10:19 AM, Gregory Collins <
>> greg at gregorycollins.net> wrote:
>>
>>>
>>> On Wed, Feb 19, 2014 at 9:36 AM, Charles-Pierre Astolfi <cpa at crans.org>wrote:
>>>
>>>> So there's a difference, but I'm not sure if it's related to my
>>>> algorithm or related to IO/RTS.
>>>
>>>
>>> Text.Printf is slower than the C version (and uses String). Use
>>> Data.ByteString.putStr instead.
>>>
>>>
>>> --
>>> Gregory Collins <greg at gregorycollins.net>
>>>
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>>
>
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-- 
*Alois Cochard*
http://aloiscochard.blogspot.com
http://twitter.com/aloiscochard
http://github.com/aloiscochard
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