Re: [Haskell-cafe] Concurrency performance problem

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 wrote:

2013/3/4 :

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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

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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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