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POWhy do you have to use both a compiler flag and a run-time flag to get multicore-support in Haskell?
 

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  1. POWhy do you have to use both a compiler flag and a run-time flag to get multicore-support in Haskell?
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    <p>The Haskell wiki shows that you need to both set a compilation flag and a run-time flag to get multi-core support. Why isn't using the library enough to get the correct behavior at compile time? Why can't the run-time executable detect it was compiled with -threaded and use all cores on the system unless otherwise specified? I think turning these on by default would be better. Then there could be flags to turn off or modify these features. </p> <p><a href="http://www.haskell.org/haskellwiki/GHC/Concurrency#Multicore_GHC" rel="noreferrer">http://www.haskell.org/haskellwiki/GHC/Concurrency#Multicore_GHC</a> says: <LI> Compile your program using the -threaded switch. <LI> Run the program with +RTS -N2 to use 2 threads, for example. You should use a -N value equal to the number of CPU cores on your machine (not including Hyper-threading cores). <P><br> It seems somewhat onerous to have flags one must set both at compile time and again at run time. Are these flags vestigial remains of the effort to add concurrency to GHC?</p>
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