23 lines
566 B
Haskell
23 lines
566 B
Haskell
{- git-annex concurrency utilities
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-
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- Copyright 2020 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Annex.Concurrent.Utility where
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import Types.Concurrency
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import GHC.Conc
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{- Honor the requested level of concurrency, but only up to the number of
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- CPU cores. Useful for things that are known to be CPU bound. -}
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concurrencyUpToCpus :: Concurrency -> IO Int
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concurrencyUpToCpus c = do
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let cn = case c of
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Concurrent n -> n
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NonConcurrent -> 1
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ConcurrentPerCpu -> 1
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pn <- getNumProcessors
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return (min cn pn)
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