1 -- -----------------------------------------------------------------------------
2 -- $Id: CPUTime.hsc,v 1.2 2001/05/08 17:33:57 qrczak 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 #ifdef HAVE_SYS_TYPES_H
30 #include <sys/types.h>
37 #ifndef mingw32_TARGET_OS
38 # ifdef HAVE_SYS_TIMES_H
39 # include <sys/times.h>
43 #ifdef HAVE_SYS_TIME_H
47 #if !defined(mingw32_TARGET_OS) && !defined(irix_TARGET_OS)
48 # if defined(HAVE_SYS_RESOURCE_H)
49 # include <sys/resource.h>
54 #include <sys/syscall.h>
55 #define getrusage(a, b) syscall(SYS_GETRUSAGE, a, b)
56 #define HAVE_GETRUSAGE
63 -- -----------------------------------------------------------------------------
64 -- Computation `getCPUTime' returns the number of picoseconds CPU time
65 -- used by the current program. The precision of this result is
66 -- implementation-dependent.
68 -- The `cpuTimePrecision' constant is the smallest measurable difference
69 -- in CPU time that the implementation can record, and is given as an
70 -- integral number of picoseconds.
72 getCPUTime :: IO Integer
76 -- getrusage() is right royal pain to deal with when targetting multiple
77 -- versions of Solaris, since some versions supply it in libc (2.3 and 2.5),
78 -- while 2.4 has got it in libucb (I wouldn't be too surprised if it was back
79 -- again in libucb in 2.6..)
81 -- Avoid the problem by resorting to times() instead.
83 #if defined(HAVE_GETRUSAGE) && ! irix_TARGET_OS && ! solaris2_TARGET_OS
84 allocaBytes (#const sizeof(struct rusage)) $ \ p_rusage -> do
85 getrusage (#const RUSAGE_SELF) p_rusage
87 let ru_utime = (#ptr struct rusage, ru_utime) p_rusage
88 let ru_stime = (#ptr struct rusage, ru_stime) p_rusage
89 u_sec <- (#peek struct timeval,tv_sec) ru_utime :: IO CLong
90 u_usec <- (#peek struct timeval,tv_usec) ru_utime :: IO CLong
91 s_sec <- (#peek struct timeval,tv_sec) ru_stime :: IO CLong
92 s_usec <- (#peek struct timeval,tv_usec) ru_stime :: IO CLong
94 return ((fromIntegral u_sec * 1000000 + fromIntegral u_usec +
95 fromIntegral s_sec * 1000000 + fromIntegral s_usec)
99 foreign import unsafe getrusage :: CInt -> Ptr CRUsage -> IO CInt
101 # if defined(HAVE_TIMES)
102 allocaBytes (#const sizeof(struct tms)) $ \ p_tms -> do
104 u_ticks <- (#peek struct tms,tms_utime) p_tms :: IO CClock
105 s_ticks <- (#peek struct tms,tms_stime) p_tms :: IO CClock
106 return (( (fromIntegral u_ticks + fromIntegral s_ticks) * 1000000000000)
110 foreign import unsafe times :: Ptr CTms -> CClock
112 ioException (IOError Nothing UnsupportedOperation
124 /* 100ns units per sec, really */
125 #define NS_PER_SEC 10000000LL
126 #define FT2usecs(ll,ft) \
127 (ll)=(ft).dwHighDateTime; \
129 (ll) |= (ft).dwLowDateTime;
133 /* cygwin32 or mingw32 version */
135 getCPUTime(StgByteArray cpuStruct)
137 FILETIME creationTime, exitTime, kernelTime, userTime;
138 StgInt *cpu=(StgInt *)cpuStruct;
139 unsigned long long uT, kT;
141 /* ToDo: pin down elapsed times to just the OS thread(s) that
142 are evaluating/managing Haskell code.
144 if (!GetProcessTimes (GetCurrentProcess(), &creationTime,
145 &exitTime, &kernelTime, &userTime)) {
146 /* Probably on a Win95 box..*/
154 FT2usecs(uT, userTime);
155 FT2usecs(kT, kernelTime);
157 cpu[0] = (unsigned int)(uT / NS_PER_SEC);
158 cpu[1] = (unsigned int)((uT - cpu[0] * NS_PER_SEC) * 100);
159 cpu[2] = (unsigned int)(kT / NS_PER_SEC);
160 cpu[3] = (unsigned int)((kT - cpu[2] * NS_PER_SEC) * 100);
165 cpuTimePrecision :: Integer
166 cpuTimePrecision = round ((1000000000000::Integer) % fromIntegral (clockTicks))
173 unsafePerformIO (sysconf (#const _SC_CLK_TCK) >>= return . fromIntegral)
174 foreign import unsafe sysconf :: CInt -> IO CLong