Default options for -threaded

[Phyx]

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 <ben at well-typed.com> wrote:

> Phyx <lonetiger at 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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