author | jjkang |
Fri, 11 Jun 2010 15:22:40 +0800 | |
changeset 2 | 9da1e5517a66 |
parent 0 | ae805ac0140d |
permissions | -rw-r--r-- |
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#! /usr/bin/env python |
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"""Tool for measuring execution time of small code snippets. |
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This module avoids a number of common traps for measuring execution |
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times. See also Tim Peters' introduction to the Algorithms chapter in |
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the Python Cookbook, published by O'Reilly. |
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|
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Library usage: see the Timer class. |
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|
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Command line usage: |
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python timeit.py [-n N] [-r N] [-s S] [-t] [-c] [-h] [statement] |
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|
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Options: |
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-n/--number N: how many times to execute 'statement' (default: see below) |
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-r/--repeat N: how many times to repeat the timer (default 3) |
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-s/--setup S: statement to be executed once initially (default 'pass') |
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-t/--time: use time.time() (default on Unix) |
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-c/--clock: use time.clock() (default on Windows) |
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-v/--verbose: print raw timing results; repeat for more digits precision |
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-h/--help: print this usage message and exit |
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statement: statement to be timed (default 'pass') |
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A multi-line statement may be given by specifying each line as a |
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separate argument; indented lines are possible by enclosing an |
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argument in quotes and using leading spaces. Multiple -s options are |
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treated similarly. |
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If -n is not given, a suitable number of loops is calculated by trying |
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successive powers of 10 until the total time is at least 0.2 seconds. |
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The difference in default timer function is because on Windows, |
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clock() has microsecond granularity but time()'s granularity is 1/60th |
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of a second; on Unix, clock() has 1/100th of a second granularity and |
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time() is much more precise. On either platform, the default timer |
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functions measure wall clock time, not the CPU time. This means that |
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other processes running on the same computer may interfere with the |
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timing. The best thing to do when accurate timing is necessary is to |
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repeat the timing a few times and use the best time. The -r option is |
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good for this; the default of 3 repetitions is probably enough in most |
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cases. On Unix, you can use clock() to measure CPU time. |
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Note: there is a certain baseline overhead associated with executing a |
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pass statement. The code here doesn't try to hide it, but you should |
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be aware of it. The baseline overhead can be measured by invoking the |
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program without arguments. |
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The baseline overhead differs between Python versions! Also, to |
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fairly compare older Python versions to Python 2.3, you may want to |
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use python -O for the older versions to avoid timing SET_LINENO |
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instructions. |
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""" |
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import gc |
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import sys |
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import time |
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try: |
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import itertools |
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except ImportError: |
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# Must be an older Python version (see timeit() below) |
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itertools = None |
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__all__ = ["Timer"] |
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dummy_src_name = "<timeit-src>" |
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default_number = 1000000 |
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default_repeat = 3 |
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if sys.platform == "win32": |
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# On Windows, the best timer is time.clock() |
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default_timer = time.clock |
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else: |
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# On most other platforms the best timer is time.time() |
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default_timer = time.time |
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# Don't change the indentation of the template; the reindent() calls |
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# in Timer.__init__() depend on setup being indented 4 spaces and stmt |
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# being indented 8 spaces. |
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template = """ |
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def inner(_it, _timer): |
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%(setup)s |
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_t0 = _timer() |
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for _i in _it: |
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%(stmt)s |
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_t1 = _timer() |
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return _t1 - _t0 |
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""" |
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def reindent(src, indent): |
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"""Helper to reindent a multi-line statement.""" |
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return src.replace("\n", "\n" + " "*indent) |
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class Timer: |
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"""Class for timing execution speed of small code snippets. |
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The constructor takes a statement to be timed, an additional |
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statement used for setup, and a timer function. Both statements |
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default to 'pass'; the timer function is platform-dependent (see |
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module doc string). |
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To measure the execution time of the first statement, use the |
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timeit() method. The repeat() method is a convenience to call |
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timeit() multiple times and return a list of results. |
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|
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The statements may contain newlines, as long as they don't contain |
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multi-line string literals. |
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""" |
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def __init__(self, stmt="pass", setup="pass", timer=default_timer): |
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"""Constructor. See class doc string.""" |
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self.timer = timer |
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stmt = reindent(stmt, 8) |
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setup = reindent(setup, 4) |
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src = template % {'stmt': stmt, 'setup': setup} |
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self.src = src # Save for traceback display |
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code = compile(src, dummy_src_name, "exec") |
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ns = {} |
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exec code in globals(), ns |
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self.inner = ns["inner"] |
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def print_exc(self, file=None): |
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"""Helper to print a traceback from the timed code. |
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123 |
|
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124 |
Typical use: |
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125 |
|
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126 |
t = Timer(...) # outside the try/except |
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127 |
try: |
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128 |
t.timeit(...) # or t.repeat(...) |
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129 |
except: |
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130 |
t.print_exc() |
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131 |
|
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132 |
The advantage over the standard traceback is that source lines |
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133 |
in the compiled template will be displayed. |
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134 |
|
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135 |
The optional file argument directs where the traceback is |
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136 |
sent; it defaults to sys.stderr. |
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137 |
""" |
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138 |
import linecache, traceback |
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139 |
linecache.cache[dummy_src_name] = (len(self.src), |
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140 |
None, |
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141 |
self.src.split("\n"), |
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142 |
dummy_src_name) |
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143 |
traceback.print_exc(file=file) |
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144 |
|
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145 |
def timeit(self, number=default_number): |
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146 |
"""Time 'number' executions of the main statement. |
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147 |
|
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148 |
To be precise, this executes the setup statement once, and |
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149 |
then returns the time it takes to execute the main statement |
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150 |
a number of times, as a float measured in seconds. The |
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151 |
argument is the number of times through the loop, defaulting |
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152 |
to one million. The main statement, the setup statement and |
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153 |
the timer function to be used are passed to the constructor. |
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154 |
""" |
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155 |
if itertools: |
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156 |
it = itertools.repeat(None, number) |
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157 |
else: |
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158 |
it = [None] * number |
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159 |
gcold = gc.isenabled() |
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160 |
gc.disable() |
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161 |
timing = self.inner(it, self.timer) |
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162 |
if gcold: |
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163 |
gc.enable() |
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164 |
return timing |
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165 |
|
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166 |
def repeat(self, repeat=default_repeat, number=default_number): |
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167 |
"""Call timeit() a few times. |
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168 |
|
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169 |
This is a convenience function that calls the timeit() |
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170 |
repeatedly, returning a list of results. The first argument |
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171 |
specifies how many times to call timeit(), defaulting to 3; |
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172 |
the second argument specifies the timer argument, defaulting |
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173 |
to one million. |
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174 |
|
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175 |
Note: it's tempting to calculate mean and standard deviation |
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176 |
from the result vector and report these. However, this is not |
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177 |
very useful. In a typical case, the lowest value gives a |
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178 |
lower bound for how fast your machine can run the given code |
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179 |
snippet; higher values in the result vector are typically not |
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180 |
caused by variability in Python's speed, but by other |
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181 |
processes interfering with your timing accuracy. So the min() |
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182 |
of the result is probably the only number you should be |
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183 |
interested in. After that, you should look at the entire |
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184 |
vector and apply common sense rather than statistics. |
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185 |
""" |
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186 |
r = [] |
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187 |
for i in range(repeat): |
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188 |
t = self.timeit(number) |
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189 |
r.append(t) |
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190 |
return r |
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191 |
|
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192 |
def main(args=None): |
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193 |
"""Main program, used when run as a script. |
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194 |
|
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195 |
The optional argument specifies the command line to be parsed, |
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196 |
defaulting to sys.argv[1:]. |
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197 |
|
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198 |
The return value is an exit code to be passed to sys.exit(); it |
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199 |
may be None to indicate success. |
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200 |
|
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201 |
When an exception happens during timing, a traceback is printed to |
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202 |
stderr and the return value is 1. Exceptions at other times |
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203 |
(including the template compilation) are not caught. |
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204 |
""" |
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205 |
if args is None: |
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206 |
args = sys.argv[1:] |
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207 |
import getopt |
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208 |
try: |
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209 |
opts, args = getopt.getopt(args, "n:s:r:tcvh", |
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210 |
["number=", "setup=", "repeat=", |
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211 |
"time", "clock", "verbose", "help"]) |
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212 |
except getopt.error, err: |
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213 |
print err |
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214 |
print "use -h/--help for command line help" |
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215 |
return 2 |
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216 |
timer = default_timer |
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217 |
stmt = "\n".join(args) or "pass" |
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218 |
number = 0 # auto-determine |
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219 |
setup = [] |
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220 |
repeat = default_repeat |
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221 |
verbose = 0 |
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222 |
precision = 3 |
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223 |
for o, a in opts: |
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224 |
if o in ("-n", "--number"): |
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225 |
number = int(a) |
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226 |
if o in ("-s", "--setup"): |
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227 |
setup.append(a) |
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228 |
if o in ("-r", "--repeat"): |
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229 |
repeat = int(a) |
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230 |
if repeat <= 0: |
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231 |
repeat = 1 |
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232 |
if o in ("-t", "--time"): |
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233 |
timer = time.time |
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234 |
if o in ("-c", "--clock"): |
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235 |
timer = time.clock |
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236 |
if o in ("-v", "--verbose"): |
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237 |
if verbose: |
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238 |
precision += 1 |
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239 |
verbose += 1 |
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240 |
if o in ("-h", "--help"): |
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241 |
print __doc__, |
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242 |
return 0 |
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243 |
setup = "\n".join(setup) or "pass" |
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244 |
# Include the current directory, so that local imports work (sys.path |
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245 |
# contains the directory of this script, rather than the current |
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246 |
# directory) |
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import os |
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sys.path.insert(0, os.curdir) |
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t = Timer(stmt, setup, timer) |
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if number == 0: |
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# determine number so that 0.2 <= total time < 2.0 |
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for i in range(1, 10): |
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number = 10**i |
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try: |
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x = t.timeit(number) |
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except: |
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t.print_exc() |
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return 1 |
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259 |
if verbose: |
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print "%d loops -> %.*g secs" % (number, precision, x) |
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if x >= 0.2: |
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break |
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try: |
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r = t.repeat(repeat, number) |
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except: |
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t.print_exc() |
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return 1 |
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best = min(r) |
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if verbose: |
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print "raw times:", " ".join(["%.*g" % (precision, x) for x in r]) |
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print "%d loops," % number, |
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usec = best * 1e6 / number |
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if usec < 1000: |
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print "best of %d: %.*g usec per loop" % (repeat, precision, usec) |
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else: |
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msec = usec / 1000 |
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if msec < 1000: |
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print "best of %d: %.*g msec per loop" % (repeat, precision, msec) |
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else: |
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sec = msec / 1000 |
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print "best of %d: %.*g sec per loop" % (repeat, precision, sec) |
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return None |
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283 |
|
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if __name__ == "__main__": |
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sys.exit(main()) |