The program is attached in this mail, along with stack & cabal config. The machine is an old T400 with an Intel dual core.

Followin some advice, I checked the output of `+RTS -s` and apparently sometimes one of the sparks is fizzled which is what causes the unexpected behaviour

From: Haskell-Cafe <haskell-cafe-bounces@haskell.org> on behalf of Johannes Waldmann <johannes.waldmann@htwk-leipzig.de>
Sent: Tuesday, January 17, 2017 3:56 PM
To: haskell-cafe@haskell.org
Subject: Re: [Haskell-cafe] Control.Parallel seemingly randomly behaviour

Hi Juan, I am interested in this because I use
Control.Parallel in teaching currently. But -

* what is your actual Main program / main function
(it was not included in your message?)
* what is your actual cabal / stack config file?
* on what machine (OS, CPU) are you running this (it seems pretty slow)?
* have you looked at eventlogs with threadscope?

- J.
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