[Haskell-cafe] Concurrency performance problem

[Johan Tibell]

On Mon, Mar 4, 2013 at 11:39 AM, Łukasz Dąbek <sznurek at gmail.com> wrote:

> Thank you for your help! This solved my performance problem :)
>
> Anyway, the second question remains. Why performance of single
> threaded calculation is affected by RTS -N parameter. Is GHC doing
> some parallelization behind the scenes?
>

I believe it's because -N makes GHC use the threaded RTS, which is
different from the non-threaded RTS and has some overheads therefore.
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