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RevolutionAnalytics / RRO

Revolution R Open
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Multithreading message reports too many cores on Mac #191

Open revodavid opened 9 years ago

revodavid commented 9 years ago

On my Mac, starting 3.2.1 (build 29) gives this message:

Multithreaded BLAS/LAPACK libraries detected. Using 8 cores for math algorithms

However, the System Report says: Number of Processors: 1 Total Number of Cores: 4

revodavid commented 9 years ago

Fix not required until after 3.2.1 release.

sfweller commented 9 years ago

The RRO is reporting the number of physical and virtual cores here, so in this case the total reported by R is 8 cores.

richcalaway commented 9 years ago

From this post (https://ghc.haskell.org/trac/ghc/ticket/8594), it appears we want to trade our call from sysctl hw.ncpu for sysctl hw.physicalcpu. (Ah, but apparently this is something new in OS X 10.10?)... Maybe we can't use it...Can somebody with a Mac make that modification to their Rprofile.site file and see if it gives the right answer?

j-martens commented 9 years ago

With it, you get the following message:

Multithreaded BLAS/LAPACK libraries detected. Using hw.physicalcpu: 4 cores for math algorithms.

Instead of: Multithreaded BLAS/LAPACK libraries detected. Using 8 cores for math algorithms.

— Josée