[Haskell-cafe] performance of map reduce

[Manlio Perillo]

Bryan O'Sullivan ha scritto:
> On Fri, Sep 19, 2008 at 2:31 PM, Manlio Perillo 
> <manlio_perillo at libero.it <mailto:manlio_perillo at libero.it>> wrote:
> 
> 
>     By the way, this phrase:
>     "We allow multiple threads to read different chunks at once by
>     supplying each one with a distinct file handle, all reading the same
>     file"
>     here:
>     http://book.realworldhaskell.org/read/concurrent-and-multicore-programming.html#id677193
> 
>     IMHO is not correct, or at least misleading.
> 
> 
> It's both correct and, er, leading. The files are opened in a single 
> thread, and then the file handles are read by multiple threads.

Ah, right, thanks.
They are read with ByteString.Lazy.



Manlio Perillo