Commit 28b71c55 authored by Ben Gamari's avatar Ben Gamari Committed by Ben Gamari

users_guide: More capabilities than processors considered harmful

Test Plan: None.

Reviewers: austin, simonmar

Reviewed By: simonmar

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D2487
parent 2ee1db60
......@@ -136,7 +136,8 @@ RTS ``-N`` options.
Be careful when using all the processors in your machine: if some of
your processors are in use by other programs, this can actually harm
performance rather than improve it.
performance rather than improve it. Asking GHC to create more capabilities
than you have physical threads is almost always a bad idea.
Setting ``-N`` also has the effect of enabling the parallel garbage
collector (see :ref:`rts-options-gc`).
......
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