How to make Haskell use whole processor power while compiling

StackOverflow https://stackoverflow.com/questions/23575186

  •  19-07-2023
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Question

I noticed that when I do compilation, installing some module, haskell compiler uses only one processor (blue chart 1/4)? 1 of 4 on my laptop.

I've heard that Haskell Compiler is smart, so it could safe my time using all I have.

Is there a way to make it faster? Some configuration maybe.

There is a pic - processor graph is blue. Yellow - network. Red - hard-drive.

At that moment when screenshot was made it could use all processor time since it does not use either hard-drive or network.

enter image description here

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Solution

You're looking for the -j flag in GHC versions 7.8.1 and higher.

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