Things I Learned from ACCU 2010

[Petr Kalny]

On Thu, 29 Apr 2010 16:02:03 +0200, Andrei Alexandrescu  
<SeeWebsiteForEmail at erdani.org> wrote:

> On 04/29/2010 06:03 AM, Petr Kalny wrote:
>> On Fri, 23 Apr 2010 15:23:22 +0200, Walter Bright
>> <newshound1 at digitalmars.com> wrote:
>>
>>> bearophile wrote:
>>>> Walter Bright:
>>>>> OCaml has a global interpreter lock which explains its behavior.
>>>>> Russell
>>>>> didn't know why the Haskell behavior was so bad. He allowed that it  
>>>>> was
>>>>> possible he was misusing it.
>>>> You have just the illusion to have learned something about this.
>>>> Trying to
>>>> read too much from this single example is very wrong. A single
>>>> benchmark,
>>>> written by a person not expert in the language, means nearly nothing.
>>>> You
>>>> need at least a suite of good benchmarks, written by people that know
>>>> the
>>>> respective languages. And even then, you have just an idea of the
>>>> situation.
>>>
>>>
>>> Fair enough, but in order to dismiss the results I'd need to know
>>> *why* the Haskell version failed so badly, and why such a
>>> straightforward attempt at parallelism is the wrong solution for  
>>> Haskell.
>>>
>>> You shouldn't have to be an expert in a language that is supposedly
>>> good at parallelism in order to get good results from it.
>>>
>>> (Russel may or not be an expert, but he is certainly not a novice at
>>> FP or parallelism.)
>>>
>>> Basically, I'd welcome an explanatory riposte to Russel's results.
>>
>> IIRC Haskell's problems with concurrency have roots in its 100% lazy
>> evaluation.
>>
>> Anyone wanting more details may find this page useful:
>>
>> http://www.haskell.org/haskellwiki/Research_papers/Parallelism_and_concurrency
>
> Which specific papers are you referring to?
>
> BTW, I wonder how current the page is. It features no paper from 2009 or  
> 2010, one from 2008, none from 2007, and six from 2006. Of those, three  
> links are broken.
>
>
> Andrei

Right, I couldn't find the paper, I have read about concurrency in  
Haskell, there as well.

(But I hoped there might be some other useful information :o).

After more searching I located that paper at:

http://research.microsoft.com/en-us/um/people/simonpj/papers/parallel/index.htm

Runtime Support for Multicore Haskell
http://research.microsoft.com/en-us/um/people/simonpj/papers/parallel/multicore-ghc.pdf

HTH

Petr