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| {- | | ||
| Module : ParallelUtilities.hs | ||
| Description : Utilities for parallel traversals, and other related functions | ||
| Copyright : (c) 2021 Ward C. Wheeler, Division of Invertebrate Zoology, AMNH. All rights reserved. | ||
| License : | ||
| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are met: | ||
| 1. Redistributions of source code must retain the above copyright notice, this | ||
| list of conditions and the following disclaimer. | ||
| 2. Redistributions in binary form must reproduce the above copyright notice, | ||
| this list of conditions and the following disclaimer in the documentation | ||
| and/or other materials provided with the distribution. | ||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND | ||
| ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR | ||
| ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | ||
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| The views and conclusions contained in the software and documentation are those | ||
| of the authors and should not be interpreted as representing official policies, | ||
| either expressed or implied, of the FreeBSD Project. | ||
| Maintainer : Ward Wheeler <[email protected]> | ||
| Stability : unstable | ||
| Portability : portable (I hope) | ||
| -} | ||
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| {-# Language ImportQualifiedPost #-} | ||
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| {-# Options_GHC -fno-warn-orphans #-} | ||
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| module ParallelUtilities | ||
| ( parmap | ||
| , seqParMap | ||
| , getNumThreads | ||
| , rnf | ||
| , myStrategy | ||
| , myStrategyR0 | ||
| , myStrategyRS | ||
| , myStrategyRDS | ||
| , myStrategyRPAR | ||
| , myParListChunk | ||
| , myParListChunkRDS | ||
| , myChunkParMapRDS | ||
| , myStrategyHighLevel | ||
| , myStrategyLowLevel | ||
| ) where | ||
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| import Control.Concurrent | ||
| import Control.DeepSeq | ||
| import Control.Parallel.Strategies | ||
| import Data.BitVector qualified as BV | ||
| import System.IO.Unsafe | ||
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| -- Map a function over a traversable structure in parallel | ||
| -- Preferred over parMap which is limited to lists | ||
| -- Add chunking (with arguement) (via chunkList) "fmap blah blah `using` parListChunk chunkSize rseq/rpar" | ||
| -- but would have to do one for lists (with Chunk) and one for vectors (splitAt recusively) | ||
| parmap :: Traversable t => Strategy b -> (a -> b) -> t a -> t b | ||
| parmap strat f = withStrategy (parTraversable strat).fmap f | ||
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| -- | seqParMap takes strategy, if numThread == 1 retuns fmap otherwise parmap and | ||
| seqParMap :: Traversable t => Strategy b -> (a -> b) -> t a -> t b | ||
| seqParMap strat f = | ||
| if getNumThreads > 1 then parmap strat f | ||
| else fmap f | ||
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| myParListChunk :: Strategy a -> Strategy [a] | ||
| myParListChunk = parListChunk getNumThreads | ||
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| myParListChunkRDS :: (NFData a) => Strategy [a] | ||
| myParListChunkRDS = parListChunk getNumThreads myStrategyRDS | ||
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| -- | myStrategy can be r0, rpar, rseq, rdeepseq | ||
| -- r0 seems fastest in tests of PhyG | ||
| myStrategy :: (NFData b) => Strategy b | ||
| myStrategy = r0 --rseq -- rpar -- rseq -- r0 | ||
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| myStrategyLowLevel :: (NFData b) => Strategy b | ||
| myStrategyLowLevel = r0 | ||
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| myStrategyHighLevel :: (NFData b) => Strategy b | ||
| myStrategyHighLevel = rdeepseq | ||
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| myStrategyR0 :: Strategy b | ||
| myStrategyR0 = r0 | ||
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| myStrategyRDS :: (NFData b) => Strategy b | ||
| myStrategyRDS = rdeepseq | ||
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| myStrategyRS :: Strategy b | ||
| myStrategyRS = rseq | ||
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| myStrategyRPAR :: Strategy b | ||
| myStrategyRPAR = rpar | ||
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| -- | getNumThreads gets number of COncurrent threads | ||
| {-# NOINLINE getNumThreads #-} | ||
| getNumThreads :: Int | ||
| getNumThreads = unsafePerformIO getNumCapabilities | ||
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| -- NFData instance for parmap/rdeepseq Bit Vectory types | ||
| instance NFData BV.BV where | ||
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| rnf bv = BV.size bv `seq` BV.nat bv `seq` () | ||
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| -- | myChunkParMapRDS chuncked parmap that defaults to fmap if not paralell | ||
| myChunkParMapRDS :: NFData c => (b -> c) -> [b] -> [c] | ||
| myChunkParMapRDS f inList = | ||
| if getNumThreads == 1 then fmap f inList | ||
| else fmap f inList `using` myParListChunkRDS |