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python3.2  3.2.2
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With.TryFinally Class Reference
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List of all members.

Classes

class  ContextManager

Public Member Functions

def test
def calibrate
def get_timer
def compatible
def calibrate_test
def run
def stat

Public Attributes

 last_timing
 warp
 times

Static Public Attributes

float version = 2.0
 Instance variables that each test should override.
int operations = 20
int rounds = 80000
int is_a_test = 1
 Internal variables.
tuple last_timing = (0.0, 0.0, 0.0)
int warp = 1
 calibration_runs = CALIBRATION_RUNS
 overhead_times = None
list times = []
 timer = TIMER_PLATFORM_DEFAULT

Detailed Description

Definition at line 50 of file With.py.


Member Function Documentation

def With.TryFinally.calibrate (   self)
Calibrate the test.

    This method should execute everything that is needed to
    setup and run the test - except for the actual operations
    that you intend to measure. pybench uses this method to
    measure the test implementation overhead.

Reimplemented from pybench.Test.

Definition at line 149 of file With.py.

00149 
00150     def calibrate(self):
00151 
00152         cm = self.ContextManager()
00153 
00154         for i in range(self.rounds):
00155             pass
00156 

def pybench.Test.calibrate_test (   self) [inherited]

Definition at line 262 of file pybench.py.

00262 
00263     def calibrate_test(self):
00264 
00265         if self.calibration_runs == 0:
00266             self.overhead_times = [0.0]
00267             return
00268 
00269         calibrate = self.calibrate
00270         timer = self.get_timer()
00271         calibration_loops = range(CALIBRATION_LOOPS)
00272 
00273         # Time the calibration loop overhead
00274         prep_times = []
00275         for i in range(self.calibration_runs):
00276             t = timer()
00277             for i in calibration_loops:
00278                 pass
00279             t = timer() - t
00280             prep_times.append(t / CALIBRATION_LOOPS)
00281         min_prep_time = min(prep_times)
00282         if _debug:
00283             print()
00284             print('Calib. prep time     = %.6fms' % (
00285                 min_prep_time * MILLI_SECONDS))
00286 
00287         # Time the calibration runs (doing CALIBRATION_LOOPS loops of
00288         # .calibrate() method calls each)
00289         for i in range(self.calibration_runs):
00290             t = timer()
00291             for i in calibration_loops:
00292                 calibrate()
00293             t = timer() - t
00294             self.overhead_times.append(t / CALIBRATION_LOOPS
00295                                        - min_prep_time)
00296 
00297         # Check the measured times
00298         min_overhead = min(self.overhead_times)
00299         max_overhead = max(self.overhead_times)
00300         if _debug:
00301             print('Calib. overhead time = %.6fms' % (
00302                 min_overhead * MILLI_SECONDS))
00303         if min_overhead < 0.0:
00304             raise ValueError('calibration setup did not work')
00305         if max_overhead - min_overhead > 0.1:
00306             raise ValueError(
00307                 'overhead calibration timing range too inaccurate: '
00308                 '%r - %r' % (min_overhead, max_overhead))

def pybench.Test.compatible (   self,
  other 
) [inherited]
Return 1/0 depending on whether the test is compatible
    with the other Test instance or not.

Definition at line 250 of file pybench.py.

00250 
00251     def compatible(self, other):
00252 
00253         """ Return 1/0 depending on whether the test is compatible
00254             with the other Test instance or not.
00255 
00256         """
00257         if self.version != other.version:
00258             return 0
00259         if self.rounds != other.rounds:
00260             return 0
00261         return 1

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def pybench.Test.get_timer (   self) [inherited]
Return the timer function to use for the test.

Definition at line 243 of file pybench.py.

00243 
00244     def get_timer(self):
00245 
00246         """ Return the timer function to use for the test.
00247 
00248         """
00249         return get_timer(self.timer)

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def pybench.Test.run (   self) [inherited]
Run the test in two phases: first calibrate, then
    do the actual test. Be careful to keep the calibration
    timing low w/r to the test timing.

Definition at line 309 of file pybench.py.

00309 
00310     def run(self):
00311 
00312         """ Run the test in two phases: first calibrate, then
00313             do the actual test. Be careful to keep the calibration
00314             timing low w/r to the test timing.
00315 
00316         """
00317         test = self.test
00318         timer = self.get_timer()
00319 
00320         # Get calibration
00321         min_overhead = min(self.overhead_times)
00322 
00323         # Test run
00324         t = timer()
00325         test()
00326         t = timer() - t
00327         if t < MIN_TEST_RUNTIME:
00328             raise ValueError('warp factor too high: '
00329                              'test times are < 10ms')
00330         eff_time = t - min_overhead
00331         if eff_time < 0:
00332             raise ValueError('wrong calibration')
00333         self.last_timing = (eff_time, t, min_overhead)
00334         self.times.append(eff_time)

def pybench.Test.stat (   self) [inherited]
Return test run statistics as tuple:

    (minimum run time,
     average run time,
     total run time,
     average time per operation,
     minimum overhead time)

Definition at line 357 of file pybench.py.

00357 
00358     def stat(self):
00359 
00360         """ Return test run statistics as tuple:
00361 
00362             (minimum run time,
00363              average run time,
00364              total run time,
00365              average time per operation,
00366              minimum overhead time)
00367 
00368         """
00369         runs = len(self.times)
00370         if runs == 0:
00371             return 0.0, 0.0, 0.0, 0.0
00372         min_time = min(self.times)
00373         total_time = sum(self.times)
00374         avg_time = total_time / float(runs)
00375         operation_avg = total_time / float(runs
00376                                            * self.rounds
00377                                            * self.operations)
00378         if self.overhead_times:
00379             min_overhead = min(self.overhead_times)
00380         else:
00381             min_overhead = self.last_timing[2]
00382         return min_time, avg_time, total_time, operation_avg, min_overhead

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def With.TryFinally.test (   self)
Run the test.

    The test needs to run self.rounds executing
    self.operations number of operations each.

Reimplemented from pybench.Test.

Definition at line 64 of file With.py.

00064 
00065     def test(self):
00066 
00067         cm = self.ContextManager()
00068 
00069         for i in range(self.rounds):
00070             cm.__enter__()
00071             try: pass
00072             finally: cm.__exit__()
00073 
00074             cm.__enter__()
00075             try: pass
00076             finally: cm.__exit__()
00077 
00078             cm.__enter__()
00079             try: pass
00080             finally: cm.__exit__()
00081 
00082             cm.__enter__()
00083             try: pass
00084             finally: cm.__exit__()
00085 
00086             cm.__enter__()
00087             try: pass
00088             finally: cm.__exit__()
00089 
00090             cm.__enter__()
00091             try: pass
00092             finally: cm.__exit__()
00093 
00094             cm.__enter__()
00095             try: pass
00096             finally: cm.__exit__()
00097 
00098             cm.__enter__()
00099             try: pass
00100             finally: cm.__exit__()
00101 
00102             cm.__enter__()
00103             try: pass
00104             finally: cm.__exit__()
00105 
00106             cm.__enter__()
00107             try: pass
00108             finally: cm.__exit__()
00109 
00110             cm.__enter__()
00111             try: pass
00112             finally: cm.__exit__()
00113 
00114             cm.__enter__()
00115             try: pass
00116             finally: cm.__exit__()
00117 
00118             cm.__enter__()
00119             try: pass
00120             finally: cm.__exit__()
00121 
00122             cm.__enter__()
00123             try: pass
00124             finally: cm.__exit__()
00125 
00126             cm.__enter__()
00127             try: pass
00128             finally: cm.__exit__()
00129 
00130             cm.__enter__()
00131             try: pass
00132             finally: cm.__exit__()
00133 
00134             cm.__enter__()
00135             try: pass
00136             finally: cm.__exit__()
00137 
00138             cm.__enter__()
00139             try: pass
00140             finally: cm.__exit__()
00141 
00142             cm.__enter__()
00143             try: pass
00144             finally: cm.__exit__()
00145 
00146             cm.__enter__()
00147             try: pass
00148             finally: cm.__exit__()


Member Data Documentation

pybench.Test.calibration_runs = CALIBRATION_RUNS [static, inherited]

Definition at line 206 of file pybench.py.

int pybench.Test.is_a_test = 1 [static, inherited]

Internal variables.

Definition at line 197 of file pybench.py.

tuple pybench.Test.last_timing = (0.0, 0.0, 0.0) [static, inherited]

Definition at line 200 of file pybench.py.

Definition at line 332 of file pybench.py.

Reimplemented from pybench.Test.

Definition at line 53 of file With.py.

pybench.Test.overhead_times = None [static, inherited]

Definition at line 209 of file pybench.py.

int With.TryFinally.rounds = 80000 [static]

Reimplemented from pybench.Test.

Definition at line 54 of file With.py.

pybench.Test.timer = TIMER_PLATFORM_DEFAULT [static, inherited]

Definition at line 215 of file pybench.py.

list pybench.Test.times = [] [static, inherited]

Definition at line 212 of file pybench.py.

pybench.Test.times [inherited]

Definition at line 234 of file pybench.py.

float With.TryFinally.version = 2.0 [static]

Instance variables that each test should override.

Reimplemented from pybench.Test.

Definition at line 52 of file With.py.

int pybench.Test.warp = 1 [static, inherited]

Definition at line 203 of file pybench.py.

pybench.Test.warp [inherited]

Definition at line 224 of file pybench.py.


The documentation for this class was generated from the following file: