>> * Massive scalability improvements to the I/O manager
>
> Just a brief note from the front lines - I recompiled a heavily threaded
> program with (a recent pre-release) of 7.8.1 and got a 10% performance
> increase over 7.6.3. Nothing like free lunches - so thanks again for
> the great work!
Did you run you program on a multicore system? If so, did you specify
+RTS -N<x> option?
If your program uses MVar heavily, you need to re-design your program.
For more information, please read:
http://www.yesodweb.com/blog/2014/01/new-fast-logger
--Kazu
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