1 -- -----------------------------------------------------------------------------
2 -- $Id: CPUTime.hsc,v 1.3 2001/05/18 16:54:04 simonmar Exp $
4 -- (c) The University of Glasgow, 1995-2001
9 getCPUTime, -- :: IO Integer
10 cpuTimePrecision -- :: Integer
13 import PrelMarshalAlloc
19 import PrelBase ( Int(..) )
20 import PrelByteArr ( ByteArray(..), newIntArray )
21 import PrelArrExtra ( unsafeFreezeByteArray )
22 import PrelIOBase ( IOException(..),
23 IOErrorType( UnsupportedOperation ),
24 unsafePerformIO, stToIO, ioException )
29 -- -----------------------------------------------------------------------------
30 -- Computation `getCPUTime' returns the number of picoseconds CPU time
31 -- used by the current program. The precision of this result is
32 -- implementation-dependent.
34 -- The `cpuTimePrecision' constant is the smallest measurable difference
35 -- in CPU time that the implementation can record, and is given as an
36 -- integral number of picoseconds.
38 getCPUTime :: IO Integer
42 -- getrusage() is right royal pain to deal with when targetting multiple
43 -- versions of Solaris, since some versions supply it in libc (2.3 and 2.5),
44 -- while 2.4 has got it in libucb (I wouldn't be too surprised if it was back
45 -- again in libucb in 2.6..)
47 -- Avoid the problem by resorting to times() instead.
49 #if defined(HAVE_GETRUSAGE) && ! irix_TARGET_OS && ! solaris2_TARGET_OS
50 allocaBytes (#const sizeof(struct rusage)) $ \ p_rusage -> do
51 getrusage (#const RUSAGE_SELF) p_rusage
53 let ru_utime = (#ptr struct rusage, ru_utime) p_rusage
54 let ru_stime = (#ptr struct rusage, ru_stime) p_rusage
55 u_sec <- (#peek struct timeval,tv_sec) ru_utime :: IO CLong
56 u_usec <- (#peek struct timeval,tv_usec) ru_utime :: IO CLong
57 s_sec <- (#peek struct timeval,tv_sec) ru_stime :: IO CLong
58 s_usec <- (#peek struct timeval,tv_usec) ru_stime :: IO CLong
60 return ((fromIntegral u_sec * 1000000 + fromIntegral u_usec +
61 fromIntegral s_sec * 1000000 + fromIntegral s_usec)
65 foreign import unsafe getrusage :: CInt -> Ptr CRUsage -> IO CInt
67 # if defined(HAVE_TIMES)
68 allocaBytes (#const sizeof(struct tms)) $ \ p_tms -> do
70 u_ticks <- (#peek struct tms,tms_utime) p_tms :: IO CClock
71 s_ticks <- (#peek struct tms,tms_stime) p_tms :: IO CClock
72 return (( (fromIntegral u_ticks + fromIntegral s_ticks) * 1000000000000)
76 foreign import unsafe times :: Ptr CTms -> CClock
78 ioException (IOError Nothing UnsupportedOperation
90 /* 100ns units per sec, really */
91 #define NS_PER_SEC 10000000LL
92 #define FT2usecs(ll,ft) \
93 (ll)=(ft).dwHighDateTime; \
95 (ll) |= (ft).dwLowDateTime;
99 /* cygwin32 or mingw32 version */
101 getCPUTime(StgByteArray cpuStruct)
103 FILETIME creationTime, exitTime, kernelTime, userTime;
104 StgInt *cpu=(StgInt *)cpuStruct;
105 unsigned long long uT, kT;
107 /* ToDo: pin down elapsed times to just the OS thread(s) that
108 are evaluating/managing Haskell code.
110 if (!GetProcessTimes (GetCurrentProcess(), &creationTime,
111 &exitTime, &kernelTime, &userTime)) {
112 /* Probably on a Win95 box..*/
120 FT2usecs(uT, userTime);
121 FT2usecs(kT, kernelTime);
123 cpu[0] = (unsigned int)(uT / NS_PER_SEC);
124 cpu[1] = (unsigned int)((uT - cpu[0] * NS_PER_SEC) * 100);
125 cpu[2] = (unsigned int)(kT / NS_PER_SEC);
126 cpu[3] = (unsigned int)((kT - cpu[2] * NS_PER_SEC) * 100);
131 cpuTimePrecision :: Integer
132 cpuTimePrecision = round ((1000000000000::Integer) % fromIntegral (clockTicks))
139 unsafePerformIO (sysconf (#const _SC_CLK_TCK) >>= return . fromIntegral)
140 foreign import unsafe sysconf :: CInt -> IO CLong