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Collect CPU time measurements on a Haskell thread basis #6

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Collect CPU time measurements on a Haskell thread basis #6

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33 changes: 29 additions & 4 deletions src/Streamly/Metrics/Perf.hs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
{-# LANGUAGE UnboxedTuples #-}
module Streamly.Metrics.Perf
(
PerfMetrics(..)
Expand All @@ -8,25 +9,49 @@ module Streamly.Metrics.Perf
)
where

import Control.Monad (unless)
import Control.Monad (when, unless)
import Data.Maybe (catMaybes)
import GHC.Exts (threadCPUTime#)
import GHC.Int(Int64(..))
import GHC.IO(IO(..))
import GHC.Stats (getRTSStats, getRTSStatsEnabled, RTSStats(..))
import Streamly.Internal.Data.Time.Units (NanoSecond64, fromAbsTime)
import Streamly.Internal.Data.Time.TimeSpec (TimeSpec(..))
import Streamly.Internal.Data.Time.Units
(NanoSecond64, fromAbsTime, toRelTime, addToAbsTime)
import Streamly.Metrics.Measure (measureWith)
import Streamly.Metrics.Perf.Type (PerfMetrics(..), checkMonotony)
import Streamly.Metrics.Perf.RUsage (getRuMetrics, pattern RUsageSelf)
import Streamly.Metrics.Type (Seconds)
import Text.Show.Pretty (ppShow)

import qualified Streamly.Internal.Data.Time.Clock as Clock

threadCPUTime :: IO (Int64, Int64)
threadCPUTime = IO $ \s ->
case threadCPUTime# s of
(# s', sec, nsec, _ #) ->
(# s', (I64# sec, I64# nsec) #)

getThreadCPUTime :: IO (Seconds Double)
getThreadCPUTime = do
(sec, nsec) <- threadCPUTime
cur <- Clock.getTime Clock.ThreadCPUTime
let start = toRelTime $ TimeSpec sec nsec
delta = addToAbsTime cur start
t :: Double = fromIntegral (fromAbsTime delta :: NanoSecond64) * 1e-9
when (t <= 0)
$ error
$ "Thread CPU time is negative: delta = " ++ show delta
++ " cur = " ++ show cur ++ " start " ++ show start
return $ fromIntegral (fromAbsTime delta :: NanoSecond64) * 1e-9

{-# INLINE getProcMetrics #-}
getProcMetrics :: IO [PerfMetrics]
getProcMetrics = do
time <- Clock.getTime Clock.Monotonic
tcpu <- Clock.getTime Clock.ThreadCPUTime
tcpuSec <- getThreadCPUTime
pcpu <- Clock.getTime Clock.ProcessCPUTime

let tcpuSec = fromIntegral (fromAbsTime tcpu :: NanoSecond64) * 1e-9
let pcpuSec = fromIntegral (fromAbsTime pcpu :: NanoSecond64) * 1e-9
let timeSec = fromIntegral (fromAbsTime time :: NanoSecond64) * 1e-9
return
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