[Haskell-cafe] Concurrency performance problem

[Nathan Howell]

Depends on the application, of course. The (on by default) parallel GC
tends to kill performance for me... you might try running both with "+RTS
-sstderr" to see if GC time is significantly higher, and try adding "+RTS
-qg1" if it is.


On Mon, Mar 4, 2013 at 2:23 PM, Łukasz Dąbek <sznurek at gmail.com> wrote:

> 2013/3/4  <briand at aracnet.com>:
>
> > do you have a link to the new code ?
>
> Diff is at the bottom of original code: http://hpaste.org/83460.
>
> If you just pass -N, GHC automatically sets the number of threads
>> based on the number of cores on your machine.
>
>
> Yes, I know that. I am just wondering why seemingly single threaded
> computation (look at singleThreadIntegrate in source code from first post)
> runs slower with increasing number of cores available (set through -N
> option).
>
> --
> Łukasz Dąbek
>
>
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