I'm trying out GHC-7.0.3-x86_64 for Mac OS X and see what seems to be a bug in
System.Time.diffClockTimes. The TimeDiff tdPicosec field returns values that
seem to jump around erratically:
test = do
startTime <- System.Time.getClockTime
endTime <- System.Time.getClockTime
let dt = diffClockTimes endTime startTime
putStrLn $ show dt
Prelude Test> test
TimeDiff {tdYear = 0, tdMonth = 0, tdDay = 0, tdHour = 0, tdMin = 0, tdSec = 0,
tdPicosec = 0}
Prelude Test> test
TimeDiff {tdYear = 0, tdMonth = 0, tdDay = 0, tdHour = 0, tdMin = 0, tdSec = 0,
tdPicosec = 3000000}
Prelude Test> test
TimeDiff {tdYear = 0, tdMonth = 0, tdDay = 0, tdHour = 0, tdMin = 0, tdSec = 0,
tdPicosec = -3329012246138323150000000}
Prelude Test> test
TimeDiff {tdYear = 0, tdMonth = 0, tdDay = 0, tdHour = 0, tdMin = 0, tdSec = 0,
tdPicosec = 3000000}
Prelude Test> test
TimeDiff {tdYear = 0, tdMonth = 0, tdDay = 0, tdHour = 0, tdMin = 0, tdSec = 0,
tdPicosec = -3329012246138322851000000}
Prelude Test>
I can file a bug, unless I'm overlooking something here.
Warren
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