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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Top
-- Copyright : (c) Jose A Ortega Ruiz
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- Process activity and memory consumption monitors
--
-----------------------------------------------------------------------------
{-# LANGUAGE ForeignFunctionInterface, BangPatterns #-}
module Plugins.Monitors.Top (startTopCpu, topMemConfig, runTopMem) where
import Plugins.Monitors.Common
import Control.Exception (SomeException, handle, evaluate)
import System.Directory
import System.FilePath
import System.Posix.Unistd (getSysVar, SysVar(ClockTick))
import Foreign.C.Types
import Data.List (sortBy)
import Data.Ord (comparing)
import Data.IORef
import Data.IntMap (IntMap)
import qualified Data.IntMap as M
topMemConfig :: IO MConfig
topMemConfig = mkMConfig "<both1>" [ k ++ n | n <- map show [1..maxProc]
, k <- ["name", "rss", "both"]]
topCpuConfig :: IO MConfig
topCpuConfig = mkMConfig "<both1>" [ k ++ n | n <- map show [1..maxProc]
, k <- ["name", "cpu", "both"]]
foreign import ccall "unistd.h getpagesize"
c_getpagesize :: CInt
pageSize :: Int
pageSize = fromIntegral c_getpagesize `div` 1024
processes :: IO [FilePath]
processes =
fmap (filter isPid) $ getDirectoryContents "/proc"
where
isPid (x:_) = x `elem` ['0'..'9']
isPid _ = False
showInfo :: String -> String -> Float -> Monitor [String]
showInfo nm sms mms = do
mnw <- getConfigValue maxWidth
mxw <- getConfigValue minWidth
let lsms = length sms
nmw = mnw - lsms - 1
nmx = mxw - lsms - 1
rnm = if nmw > 0 then padString nmw nmx " " True nm else nm
mstr <- showWithColors' sms mms
both <- showWithColors' (rnm ++ " " ++ sms) mms
return [nm, mstr, both]
defHandle :: a -> SomeException -> IO a
defHandle def _ = evaluate def
handlePidFile :: a -> ([String] -> IO a) -> FilePath -> IO a
handlePidFile def action pidf =
handle (defHandle def) (fmap words (readFile f) >>= action)
where f = "/proc" </> pidf </> "stat"
maxProc :: Int
maxProc = 5
type Meminfo = (String, Int)
meminfo :: FilePath -> IO Meminfo
meminfo = handlePidFile ("", 0) $ \fs ->
let !m = pageSize * read (fs !! 23)
!n = drop 1 $ init (fs !! 1)
in evaluate (n, m)
meminfos :: IO [Meminfo]
meminfos = do
fs <- processes
mapM meminfo fs
topMemProcesses :: Int -> IO [Meminfo]
topMemProcesses n = fmap (take n . sbm) meminfos
where sbm = sortBy (flip (comparing snd))
showMeminfo :: Meminfo -> Monitor [String]
showMeminfo (nm, rss) =
showInfo nm sms (ms / 1024)
where ms = fromIntegral rss
sms = showWithUnits 2 1 ms
runTopMem :: [String] -> Monitor String
runTopMem _ = do
ps <- io $ topMemProcesses maxProc
pstr <- mapM showMeminfo ps
parseTemplate $ concat pstr
type Pid = Int
type TimeInfo = (String, Float)
type TimeEntry = (Pid, TimeInfo)
type Times = IntMap TimeInfo
type TimesRef = IORef Times
timeEntry :: FilePath -> IO TimeEntry
timeEntry = handlePidFile (0, ("", 0)) $ \fs ->
let rf = read . (fs!!)
!pid = read (head fs)
!n = drop 1 $ init (fs!!1)
!t = rf 13 + rf 14
in evaluate (pid, (n, t))
timeinfos :: IO Times
timeinfos = fmap M.fromList (processes >>= mapM timeEntry)
combineTimeInfos :: Times -> Times -> Times
combineTimeInfos !t0 !t1 = M.intersectionWith timeDiff t1 t0
where timeDiff (n, x1) (_, x0) = (n, x1 - x0)
topTimeProcesses :: Int -> TimesRef -> Float -> IO [TimeInfo]
topTimeProcesses n tref lapse = do
t1 <- timeinfos
t0 <- readIORef tref
writeIORef tref $! t1
let !ts = M.elems $ combineTimeInfos t0 t1
!sts = take n $ sortBy (flip (comparing snd)) ts
!nts = map norm sts
norm (nm, t) = (nm, 100 * t / lapse)
return nts
showTimeInfo :: TimeInfo -> Monitor [String]
showTimeInfo (n, t) = showInfo n (showDigits 1 t) t
runTopCpu :: TimesRef -> Float -> [String] -> Monitor String
runTopCpu tref lapse _ = do
ps <- io $ topTimeProcesses maxProc tref lapse
pstr <- mapM showTimeInfo ps
parseTemplate $ concat pstr
startTopCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
startTopCpu a r cb = do
t <- getSysVar ClockTick
tref <- newIORef M.empty
let lapse = (fromIntegral r * fromIntegral t) / 10
runM a topCpuConfig (runTopCpu tref lapse) r cb
|
