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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.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", "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
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]
strictReadFile :: FilePath -> IO String
strictReadFile f =
do hdl <- openFile f ReadMode
xs <- getc hdl
hClose hdl
return xs
where getc hdl = do e <- hIsEOF hdl
if e then return []
else do c <- hGetChar hdl
cs <- getc hdl
return (c:cs)
getProcessData :: FilePath -> IO [String]
getProcessData pidf =
handle ((\_ -> evaluate []) :: SomeException -> IO [String])
(do s <- strictReadFile $ "/proc" </> pidf </> "stat"
evaluate $! words s)
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 :: 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, UTCTime)
timeEntry :: [String] -> TimeEntry
timeEntry fs = (p, (n, t))
where !p = read (head fs)
!n = processName fs
!t = read (fs!!13) + read (fs!!14)
timeEntries :: IO [TimeEntry]
timeEntries = handleProcesses (0, ("", 0)) timeEntry
timeinfos :: IO Times
timeinfos = fmap M.fromList timeEntries
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 scale = do
!c1 <- getCurrentTime
!t1 <- timeinfos
(t0, c0) <- readIORef tref
modifyIORef tref (const $! (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, min 100 $ t / scx)
return nts
showTimeInfo :: TimeInfo -> Monitor [String]
showTimeInfo (n, t) = showInfo n (showDigits 1 t) t
runTopCpu :: TimesRef -> Float -> [String] -> Monitor String
runTopCpu tref scale _ = do
ps <- io $ topTimeProcesses maxProc tref scale
pstr <- mapM showTimeInfo ps
parseTemplate $ concat pstr
startTopCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
startTopCpu a r cb = do
cr <- getSysVar ClockTick
c <- getCurrentTime
tref <- newIORef (M.empty, c)
runM a topCpuConfig (runTopCpu tref (fromIntegral cr)) r cb
|
