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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 #-}
module Plugins.Monitors.Top (startTopCpu, topMemConfig, runTopMem) where
import Plugins.Monitors.Common
import Control.Exception (SomeException, handle, evaluate)
import Control.Concurrent
import System.Directory
import System.FilePath
import System.Posix.Unistd (getSysVar, SysVar(ClockTick))
import Foreign.C.Types
import Data.List (sortBy, foldl')
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
data Meminfo = MI !String !Int
meminfo :: FilePath -> IO Meminfo
meminfo = handlePidFile (MI "" 0) $ \fs ->
let m = pageSize * (read $! (fs !! 23))
n = drop 1 $! init (fs !! 1)
in evaluate $! MI 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 cmp
cmp (MI _ x) (MI _ y) = compare y x
showMeminfo :: Meminfo -> Monitor [String]
showMeminfo (MI 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
data Timeinfo = TI !String !Float
type Times = IntMap Timeinfo
data TimesVal = TiV !Int !String !Float
timeinfo :: FilePath -> IO TimesVal
timeinfo = handlePidFile (TiV 0 "" 0) $ \fs ->
let pid = read (head fs)
rf = read . (fs!!)
n = drop 1 $ init (fs!!1)
in evaluate $! TiV pid n (rf 13 + rf 14)
timeinfos :: IO Times
timeinfos = do
fs <- processes
tis <- mapM timeinfo $! fs
return $! foldl' acc M.empty tis
where acc m (TiV p n t) = M.insert p (TI n t) m
combineTimeInfos :: Times -> Times -> Times
combineTimeInfos t0 t1 = M.intersectionWith timeDiff t1 t0
where timeDiff (TI n x1) (TI _ x0) = TI n (x1 - x0)
type TIVar = MVar Times
topTimeProcesses :: Int -> TIVar -> Float -> IO [Timeinfo]
topTimeProcesses n tivar lapse = do
t0 <- readMVar tivar
t1 <- timeinfos
modifyMVar_ tivar (\_ -> return $! t1)
let ts = M.elems $ combineTimeInfos t0 t1
sts = take n $ sortBy cmp ts
cmp (TI _ x) (TI _ y) = compare y x
norm (TI nm t) = TI nm (100 * t / lapse)
return $! map norm sts
showTimeInfo :: Timeinfo -> Monitor [String]
showTimeInfo (TI n t) = showInfo n (showDigits 1 t) t
runTopCpu :: TIVar -> Float -> [String] -> Monitor String
runTopCpu tivar lapse _ = do
ps <- io $ topTimeProcesses maxProc tivar lapse
pstr <- mapM showTimeInfo ps
parseTemplate $ concat pstr
startTopCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
startTopCpu a r cb = do
t <- getSysVar ClockTick
tivar <- newMVar M.empty
let lapse = (fromIntegral r * fromIntegral t) / 10
runM a topCpuConfig (runTopCpu tivar lapse) r cb
|
