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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 (startTop, topMemConfig, runTopMem) where
import Plugins.Monitors.Common
import Plugins.Monitors.Mem (usedMem)
import Control.Exception (SomeException, handle, evaluate)
import System.Directory
import System.FilePath
import System.IO
import System.Posix.Unistd (getSysVar, SysVar(ClockTick))
import Foreign.C.Types
import Data.List (sortBy)
import Data.Ord (comparing)
import Data.IORef
import Data.Time.Clock
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", "mem", "both"]]
topConfig :: IO MConfig
topConfig = mkMConfig "<both1>" [ k ++ n | n <- map show [1..maxProc]
, k <- [ "name", "cpu", "both"
, "mname", "mem", "mboth"]]
foreign import ccall "unistd.h getpagesize"
c_getpagesize :: CInt
pageSize :: Int
pageSize = fromIntegral c_getpagesize `div` 1024
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]
getProcessData :: FilePath -> IO [String]
getProcessData pidf =
handle ((\_ -> evaluate []) :: SomeException -> IO [String])
(withFile ("/proc" </> pidf </> "stat") ReadMode readWords)
where readWords = fmap words . hGetLine
processes :: IO [FilePath]
processes = fmap (filter isPid) (getDirectoryContents "/proc")
where isPid = all (`elem` ['0'..'9'])
handleProcesses :: a -> ([String] -> a) -> IO [a]
handleProcesses def f = do
ps <- processes
pd <- mapM getProcessData $! ps
return $! map (\x -> if x == [] then def else f x) pd
processName :: [String] -> String
processName = drop 1 . init . (!!1)
maxProc :: Int
maxProc = 5
type Meminfo = (String, Int)
meminfo :: [String] -> Meminfo
meminfo fs = (n, r)
where !n = processName fs
!r = pageSize * read (fs!!23)
meminfos :: IO [Meminfo]
meminfos = handleProcesses ("", 0) meminfo
topMemProcesses :: Int -> IO [Meminfo]
topMemProcesses n = fmap (take n . sbm) meminfos
where sbm = sortBy (flip (comparing snd))
showMeminfo :: Float -> Meminfo -> Monitor [String]
showMeminfo scale (nm, rss) =
showInfo nm sms (ms / (1024 * scale))
where ms = fromIntegral rss
sms = showWithUnits 2 1 ms
runTopMem :: [String] -> Monitor String
runTopMem _ = do
ps <- io $ topMemProcesses maxProc
pstr <- mapM (showMeminfo 1) ps
parseTemplate $ concat pstr
type Pid = Int
type TimeInfo = (String, Float)
type TimeEntry = (Pid, TimeInfo)
type Times = IntMap TimeInfo
type TimesRef = IORef (Times, UTCTime)
timeMemEntry :: [String] -> (TimeEntry, Meminfo)
timeMemEntry fs = ((p, (n, t)), (n, r))
where !p = read (head fs)
!n = processName fs
!t = read (fs!!13) + read (fs!!14)
!r = pageSize * read (fs!!23)
timeMemEntries :: IO [(TimeEntry, Meminfo)]
timeMemEntries = handleProcesses ((0, ("", 0)), ("", 0)) timeMemEntry
timeMemInfos :: IO (Times, [Meminfo])
timeMemInfos =
fmap (\x -> (M.fromList . map fst $ x, map snd x)) timeMemEntries
combineTimeInfos :: Times -> Times -> Times
combineTimeInfos !t0 !t1 = M.intersectionWith timeDiff t1 t0
where timeDiff (n, x1) (_, x0) = let !d = x1 - x0 in (n, d)
topProcesses :: Int -> TimesRef -> Float -> IO ([TimeInfo], [Meminfo])
topProcesses n tref scale = do
c1 <- getCurrentTime
(t1, mi) <- timeMemInfos
(t0, c0) <- readIORef tref
writeIORef tref (t1, c1)
let ts = M.elems $ combineTimeInfos t0 t1
sts = take n $ sortBy (flip (comparing snd)) ts
nts = map norm sts
scx = (fromRational . toRational $! diffUTCTime c1 c0) * scale / 100
norm (nm, t) = (nm, t / scx)
mis = take n (sbm mi)
sbm = sortBy (flip (comparing snd))
return (nts, mis)
showTimeInfo :: TimeInfo -> Monitor [String]
showTimeInfo (n, t) = showInfo n (showDigits 1 t) t
runTop :: TimesRef -> Float -> Float -> [String] -> Monitor String
runTop tref scale mscale _ = do
(ps, ms) <- io $ topProcesses maxProc tref scale
pstr <- mapM showTimeInfo ps
mstr <- mapM (showMeminfo mscale) ms
parseTemplate $ concat $ zipWith (++) pstr mstr
startTop :: [String] -> Int -> (String -> IO ()) -> IO ()
startTop a r cb = do
cr <- getSysVar ClockTick
m <- usedMem
c <- getCurrentTime
tref <- newIORef (M.empty, c)
runM a topConfig (runTop tref (fromIntegral cr) m) r cb
|
