Oh, thanks! I wasn't aware of either or these! Useful to know. That does cover the use case I could think of.
Thanks, Tamar On Mon, Oct 10, 2016, 14:34 Ben Gamari <b...@well-typed.com> wrote: > Phyx <loneti...@gmail.com> writes: > > > Oops, sorry, only just now seen this. It seems my overly aggressive > filters > > couldn't decide where to put the email :) > > > > I do agree to some extend with this. I'd prefer if I made a mistake for > my > > system not to hang. The one downside to this default though is that you > > can't just hand a program over to user and have it run at full > capabilities. > > > > If it possible to set this from inside a program? My guess is no, since > by > > the time you get to main the rts is already initialized? > > > > Would a useful alternative be to provide a compile flag that would change > > the default? e.g. opt-in? Since now there is a small burden on the end > user. > > > There exist two pretty good tools for accomplishing what you want, > > 1. Call Control.Concurrent.setNumCapabilities [1] from within your > application. > > 2. Use GHC's -with-rtsopts flag [2] to set the default RTS arguments > during compilation of your application. > > Cheers, > > - Ben > > > [1] > http://localhost:7000/file/opt/exp/ghc/roots/8.0.1/share/doc/ghc-8.0.1/html/libraries/base-4.9.0.0/Control-Concurrent.html#v:setNumCapabilities > [2] > http://downloads.haskell.org/~ghc/master/users-guide//phases.html?highlight=#ghc-flag--with-rtsopts >
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