Given the following program, with GHC 7.6:
import Control.Concurrent
main = do
setNumCapabilities 8
putStrLn "After"
If I create with ghc --makeand run, I get:
main: setNumCapabilities: not supported in the non-threaded RTS
After
The warning about non-threaded RTS is due to what I did not build with -threaded. I would like to change this code so that it doesn't print anything, even if it didn't work. For example, if I could find that RTS was not streaming, I could avoid setNumCapabilities. I do not want to put anything on the performance of the calling program.
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