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.
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. Of course, this is just my two-cents. Cheers, - Ben
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