aeca7c2207
The only price paid is one additional MVar read per write to the journal. Presumably writing a journal file dominiates over a MVar read time by several orders of magnitude. --batch does not get the speedup because then it needs to notice when another process has made a change. Also made the assistant and other damon modes bypass the optimisation, which would not help them anyway.
53 lines
1.7 KiB
Haskell
53 lines
1.7 KiB
Haskell
{- git-annex benchmark infrastructure
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-
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- Copyright 2019 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 Benchmark where
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import Common
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import Types.Benchmark
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import Types.Command
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import CmdLine.Action
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import CmdLine
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import CmdLine.GitAnnex.Options
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import qualified Annex
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import qualified Annex.Branch
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import Annex.Action
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import qualified Options.Applicative as O
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{- Given a list of all git-annex Commands, and the user's input,
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- generates an IO action to benchmark that runs the specified
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- commands. -}
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mkGenerator :: MkBenchmarkGenerator
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mkGenerator cmds userinput = do
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-- Get the git-annex branch updated, to avoid the overhead of doing
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-- so skewing the runtime of the first action that will be
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-- benchmarked.
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Annex.Branch.commit "benchmarking"
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_ <- Annex.Branch.update
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l <- mapM parsesubcommand $ split [";"] userinput
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return $ do
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forM_ l $ \(cmd, seek, st) ->
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-- The cmd is run for benchmarking without startup or
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-- shutdown actions.
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Annex.eval st $ performCommandAction cmd seek noop
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-- Since the cmd will be run many times, some zombie
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-- processes that normally only occur once per command
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-- will build up; reap them.
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reapZombies
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where
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-- Simplified versio of CmdLine.dispatch, without support for fuzzy
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-- matching or out-of-repo commands.
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parsesubcommand ps = do
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(cmd, seek, globalconfig) <- liftIO $ O.handleParseResult $
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parseCmd "git-annex" "benchmarking" gitAnnexGlobalOptions ps cmds cmdparser
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-- Make an entirely separate Annex state for each subcommand,
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-- and prepare it to run the cmd.
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st <- liftIO . Annex.new =<< Annex.getState Annex.repo
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((), st') <- liftIO $ Annex.run st $
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prepRunCommand cmd globalconfig
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return (cmd, seek, st')
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