How to make Haskell use whole processor power while compiling

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.

Wieland

Note that, as full as your memory looks, fully exploiting all cores might not be such a great idea since this tends to also cost more RAM. It might drive the compilation into swap, effectively making it substantially slower! – Shuntwound

Green - memory. Light green - cached / not active memory. – Wieland

Answer 1

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

Basilisk