Two years seems a good amount of time for any objectors. https://ghc.haskell.org/trac/ghc/ticket/16126#ticket
On Fri, Oct 21, 2016 at 5:35 PM Simon Marlow <marlo...@gmail.com> wrote: > > On 8 October 2016 at 17:55, Ben Gamari <b...@well-typed.com> wrote: >> >> loneti...@gmail.com writes: >> >> > Hi All, >> > >> > A user on https://ghc.haskell.org/trac/ghc/ticket/11054 has asked why >> > -N -qa isn’t the default for -threaded. >> > >> I'm not sure that scheduling on all of the cores on the user's machine by >> default is a good idea, especially given that our users have >> learned to expect the existing default. Enabling affinity by default >> seems reasonable if we have evidence that it helps the majority of >> applications, but we would first need to introduce an additional >> flag to disable it. > > > Affinity is almost always a bad idea in my experience. > >> >> In general I think -N1 is a reasonable default as it acknowledges the >> fact that deploying parallelism is not something that can be done >> blindly in many (most?) applications. To make effective use of >> parallelism the user needs to understand their hardware, their >> application, and its interaction with the runtime system and configure >> the RTS appropriately. >> > > Agree on keeping -N1. > > Related to this, I think it's about time we made -threaded the default. We > could add a -single-threaded option to get back the old behaviour. > > There is a small overhead to using -threaded, but -threaded is also required > to make a lot of things work (e.g. waitForProcess in a multithreaded program, > not to mention parallelism). > > Anyone interested in doing this? > > Cheers > Simon > > >> >> Of course, this is just my two-cents. >> >> Cheers, >> >> - Ben >> >> _______________________________________________ >> ghc-devs mailing list >> ghc-devs@haskell.org >> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs >> > > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
