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authorRobert J. Macomber <robertm@dilithium>2014-06-27 18:22:30 -0700
committerRobert J. Macomber <robertm@dilithium>2014-06-27 18:22:30 -0700
commita0397ad2ad0f9382bccf4e10ecf1435dab9cf01c (patch)
tree527577492e0c7e392ec7eb8154294fb970ca5b58 /src/Plugins/Monitors
parentcfb6773cd3761ae7df279bc2387edb6547aa15b9 (diff)
downloadxmobar-a0397ad2ad0f9382bccf4e10ecf1435dab9cf01c.tar.gz
xmobar-a0397ad2ad0f9382bccf4e10ecf1435dab9cf01c.tar.bz2
Fix for CPU monitor on long-running systems
After running long enough, the numbers in /proc/stat get big enough that they will not fit in a Float without loss of precision, which leads to erratic results such as reporting "NaN%" CPU usage. This commit simply keeps the numbers integral until producing the final percentage result.
Diffstat (limited to 'src/Plugins/Monitors')
-rw-r--r--src/Plugins/Monitors/Cpu.hs10
1 files changed, 5 insertions, 5 deletions
diff --git a/src/Plugins/Monitors/Cpu.hs b/src/Plugins/Monitors/Cpu.hs
index 6e83c67..df2dc4e 100644
--- a/src/Plugins/Monitors/Cpu.hs
+++ b/src/Plugins/Monitors/Cpu.hs
@@ -24,12 +24,12 @@ cpuConfig = mkMConfig
"Cpu: <total>%"
["bar","vbar","total","user","nice","system","idle","iowait"]
-type CpuDataRef = IORef [Float]
+type CpuDataRef = IORef [Int]
-cpuData :: IO [Float]
+cpuData :: IO [Int]
cpuData = cpuParser `fmap` B.readFile "/proc/stat"
-cpuParser :: B.ByteString -> [Float]
+cpuParser :: B.ByteString -> [Int]
cpuParser = map (read . B.unpack) . tail . B.words . head . B.lines
parseCpu :: CpuDataRef -> IO [Float]
@@ -38,8 +38,8 @@ parseCpu cref =
b <- cpuData
writeIORef cref b
let dif = zipWith (-) b a
- tot = foldr (+) 0 dif
- percent = map (/ tot) dif
+ tot = fromIntegral $ foldr (+) 0 dif
+ percent = map (/ tot) (map fromIntegral dif)
return percent
formatCpu :: [Float] -> Monitor [String]