diff options
Diffstat (limited to 'Tools/pybench/systimes.py')
| -rw-r--r-- | Tools/pybench/systimes.py | 44 |
1 files changed, 29 insertions, 15 deletions
diff --git a/Tools/pybench/systimes.py b/Tools/pybench/systimes.py index 79d249f..bf07e36 100644 --- a/Tools/pybench/systimes.py +++ b/Tools/pybench/systimes.py @@ -16,7 +16,7 @@ platforms. If no supported timing methods based on process time can be found, - the module reverts to the highest resolution wall-time timer + the module reverts to the highest resolution wall-clock timer instead. The system time part will then always be 0.0. The module exports one public API: @@ -52,8 +52,8 @@ USE_CTYPES_GETPROCESSTIMES = 'cytpes GetProcessTimes() wrapper' USE_WIN32PROCESS_GETPROCESSTIMES = 'win32process.GetProcessTimes()' USE_RESOURCE_GETRUSAGE = 'resource.getrusage()' USE_PROCESS_TIME_CLOCK = 'time.clock() (process time)' -USE_WALL_TIME_CLOCK = 'time.clock() (wall-time)' -USE_WALL_TIME_TIME = 'time.time() (wall-time)' +USE_WALL_TIME_CLOCK = 'time.clock() (wall-clock)' +USE_WALL_TIME_TIME = 'time.time() (wall-clock)' if sys.platform[:3] == 'win': # Windows platform @@ -63,7 +63,7 @@ if sys.platform[:3] == 'win': try: import ctypes except ImportError: - # Use the wall-time implementation time.clock(), since this + # Use the wall-clock implementation time.clock(), since this # is the highest resolution clock available on Windows SYSTIMES_IMPLEMENTATION = USE_WALL_TIME_CLOCK else: @@ -91,7 +91,7 @@ if SYSTIMES_IMPLEMENTATION is None: # time) SYSTIMES_IMPLEMENTATION = USE_PROCESS_TIME_CLOCK else: - # Use wall-time implementation time.time() since this provides + # Use wall-clock implementation time.time() since this provides # the highest resolution clock on most systems SYSTIMES_IMPLEMENTATION = USE_WALL_TIME_TIME @@ -103,24 +103,27 @@ def getrusage_systimes(): def process_time_clock_systimes(): return (time.clock(), 0.0) -def wall_time_clock_systimes(): +def wall_clock_clock_systimes(): return (time.clock(), 0.0) -def wall_time_time_systimes(): +def wall_clock_time_systimes(): return (time.time(), 0.0) # Number of clock ticks per second for the values returned # by GetProcessTimes() on Windows. # -# Note: Ticks returned by GetProcessTimes() are micro-seconds on -# Windows XP (though the docs say 100ns intervals) -WIN32_PROCESS_TIMES_TICKS_PER_SECOND = 10e6 +# Note: Ticks returned by GetProcessTimes() are 100ns intervals on +# Windows XP. However, the process times are only updated with every +# clock tick and the frequency of these is somewhat lower: depending +# on the OS version between 10ms and 15ms. Even worse, the process +# time seems to be allocated to process currently running when the +# clock interrupt arrives, ie. it is possible that the current time +# slice gets accounted to a different process. + +WIN32_PROCESS_TIMES_TICKS_PER_SECOND = 1e7 def win32process_getprocesstimes_systimes(): d = win32process.GetProcessTimes(win32process.GetCurrentProcess()) - # Note: I'm not sure whether KernelTime on Windows is the same as - # system time on Unix - I've yet to see a non-zero value for - # KernelTime on Windows. return (d['UserTime'] / WIN32_PROCESS_TIMES_TICKS_PER_SECOND, d['KernelTime'] / WIN32_PROCESS_TIMES_TICKS_PER_SECOND) @@ -149,10 +152,10 @@ elif SYSTIMES_IMPLEMENTATION is USE_PROCESS_TIME_CLOCK: systimes = process_time_clock_systimes elif SYSTIMES_IMPLEMENTATION is USE_WALL_TIME_CLOCK: - systimes = wall_time_clock_systimes + systimes = wall_clock_clock_systimes elif SYSTIMES_IMPLEMENTATION is USE_WALL_TIME_TIME: - systimes = wall_time_time_systimes + systimes = wall_clock_time_systimes elif SYSTIMES_IMPLEMENTATION is USE_WIN32PROCESS_GETPROCESSTIMES: systimes = win32process_getprocesstimes_systimes @@ -163,6 +166,17 @@ elif SYSTIMES_IMPLEMENTATION is USE_CTYPES_GETPROCESSTIMES: else: raise TypeError('no suitable systimes() implementation found') +def processtime(): + + """ Return the total time spent on the process. + + This is the sum of user and system time as returned by + systimes(). + + """ + user, system = systimes() + return user + system + ### Testing def some_workload(): |