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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 (startTop, topMemConfig, runTopMem) where
import Plugins.Monitors.Common
import Control.Exception (SomeException, handle)
import Data.IORef (IORef, newIORef, readIORef, writeIORef)
import Data.List (sortBy, foldl')
import Data.Ord (comparing)
import Data.Time.Clock (UTCTime, getCurrentTime, diffUTCTime)
import System.Directory (getDirectoryContents)
import System.FilePath ((</>))
import System.IO (IOMode(ReadMode), hGetLine, withFile)
import System.Posix.Unistd (SysVar(ClockTick), getSysVar)
import Foreign.C.Types
maxEntries :: Int
maxEntries = 10
intStrs :: [String]
intStrs = map show [1..maxEntries]
topMemConfig :: IO MConfig
topMemConfig = mkMConfig "<both1>"
[ k ++ n | n <- intStrs , k <- ["name", "mem", "both"]]
topConfig :: IO MConfig
topConfig = mkMConfig "<both1>"
("no" : [ k ++ n | n <- intStrs
, k <- [ "name", "cpu", "both"
, "mname", "mem", "mboth"]])
foreign import ccall "unistd.h getpagesize"
c_getpagesize :: CInt
pageSize :: Float
pageSize = fromIntegral c_getpagesize / 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]
ignoreErrors :: IO [String] -> IO [String]
ignoreErrors = handle returnEmpty
where returnEmpty = const (return []) :: SomeException -> IO [String]
processes :: IO [FilePath]
processes = ignoreErrors $ fmap (filter isPid) (getDirectoryContents "/proc")
where isPid = (`elem` ['0'..'9']) . head
getProcessData :: FilePath -> IO [String]
getProcessData pidf =
ignoreErrors $ withFile ("/proc" </> pidf </> "stat") ReadMode readWords
where readWords = fmap words . hGetLine
handleProcesses :: ([String] -> a) -> IO [a]
handleProcesses f =
fmap (foldl' (\a p -> if null p then a else f p : a) [])
(processes >>= mapM getProcessData)
processName :: [String] -> String
processName = drop 1 . init . (!!1)
sortTop :: [(a, Float)] -> [(a, Float)]
sortTop = sortBy (flip (comparing snd))
type Meminfo = (String, Float)
meminfo :: [String] -> Meminfo
meminfo fs = (processName fs, pageSize * read (fs!!23))
meminfos :: IO [Meminfo]
meminfos = handleProcesses meminfo
showMeminfo :: Float -> Meminfo -> Monitor [String]
showMeminfo scale (nm, rss) =
showInfo nm (showWithUnits 2 1 rss) (100 * rss / sc)
where sc = if scale > 0 then scale else 100
showMeminfos :: [Meminfo] -> Monitor [[String]]
showMeminfos ms = mapM (showMeminfo tm) $ sortTop ms
where tm = sum (map snd ms)
runTopMem :: [String] -> Monitor String
runTopMem _ = do
pstr <- io meminfos >>= showMeminfos
parseTemplate $ concat pstr
type Pid = Int
type TimeInfo = (String, Float)
type TimeEntry = (Pid, TimeInfo)
type Times = [TimeEntry]
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) = meminfo fs
timeMemEntries :: IO [(TimeEntry, Meminfo)]
timeMemEntries = handleProcesses timeMemEntry
timeMemInfos :: IO (Times, [Meminfo], Int)
timeMemInfos =
fmap (\x -> (sortPids $ map fst x, map snd x, length x)) timeMemEntries
where sortPids = sortBy (comparing fst)
combine :: Times -> Times -> Times
combine _ [] = []
combine [] t = t
combine l@((p0, (n0, t0)):xs) r@((p1, (n1, t1)):ys)
| p0 == p1 = (p0, (n0, t1 - t0)) : combine xs ys
| p0 < p1 = combine xs r
| otherwise = (p1, (n1, t1)) : combine l ys
topProcesses :: TimesRef -> Float -> IO (Int, [TimeInfo], [Meminfo])
topProcesses tref scale = do
(t0, c0) <- readIORef tref
(t1', mis, len) <- timeMemInfos
c1 <- getCurrentTime
let !t1 = t1'
writeIORef tref (t1, c1)
let scx = realToFrac (diffUTCTime c1 c0) * scale
-- c0 and c1 can be equal, for instance, if we tweak the clock
!scx' = if scx > 0 then scx else scale
ts = combine t0 t1
nts = map (\(_, (nm, t)) -> (nm, min 100 (t / scx'))) ts
return (len, sortTop nts, mis)
showTimeInfo :: TimeInfo -> Monitor [String]
showTimeInfo (n, t) = showInfo n (showDigits 0 t) t
runTop :: TimesRef -> Float -> [String] -> Monitor String
runTop tref scale _ = do
(no, ps, ms) <- io $ topProcesses tref scale
pstr <- mapM showTimeInfo ps
mstr <- showMeminfos ms
let !pstr' = take maxEntries pstr
!mstr' = take maxEntries mstr
parseTemplate $! show no : concat (zipWith (++) pstr' mstr')
startTop :: [String] -> Int -> (String -> IO ()) -> IO ()
startTop a r cb = do
cr <- getSysVar ClockTick
c <- getCurrentTime
tref <- newIORef ([], c)
runM a topConfig (runTop tref (fromIntegral cr / 100)) r cb
|
