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Boxiang Sun
cython
Commits
e7839786
Commit
e7839786
authored
Nov 27, 2009
by
Robert Bradshaw
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More typos (Kevin Stueve)
parent
cfdb3685
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src/quickstart/cythonize.rst
src/quickstart/cythonize.rst
+1
-1
src/tutorial/profiling_tutorial.rst
src/tutorial/profiling_tutorial.rst
+7
-7
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src/quickstart/cythonize.rst
View file @
e7839786
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@@ -108,7 +108,7 @@ Determining where to add types
------------------------------
Because static typing is often the key to large speed gains, beginners
often have a tendency to type everything in si
te
. This cuts down on both
often have a tendency to type everything in si
ght
. This cuts down on both
readability and flexibility. On the other hand, it is easy to kill
performance by forgetting to type a critical loop variable. Two essential
tools to help with this task are profiling and annotation.
...
...
src/tutorial/profiling_tutorial.rst
View file @
e7839786
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@@ -132,11 +132,11 @@ the code got slower by 2 seconds because it ran inside the cProfile module. The
table contains the real valuable information. You might want to check the
python `profiling documentation <http://docs.python.org/library/profile.html>`_
for the nitty gritty details. The most important columns here are totime (total
time spen
d
in this function **not** counting functions that were called by this
function) and cumtime (total time spen
d
in this function **also** counting the
time spen
t
in this function **not** counting functions that were called by this
function) and cumtime (total time spen
t
in this function **also** counting the
functions called by this function). Looking at the tottime column, we see that
approximately half the time is spen
d in approx_pi and the other half is spend
in recip_square. Also half a second is spen
d
in range ... of course we should
approximately half the time is spen
t in approx_pi and the other half is spent
in recip_square. Also half a second is spen
t
in range ... of course we should
have used xrange for such a big iteration. And in fact, just changing range to
xrange makes the code run in 5.8 seconds.
...
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@@ -280,11 +280,11 @@ of our first Cython version. Also note that recip_square has vanished from the
table like we wanted. But the most peculiar and import change is that
approx_pi also got much faster. This is a problem with all profiling: calling a
function in a profile run adds a certain overhead to the function call. This
overhead is **not** added to the time spen
d
in the called function, but to the
time spen
d
in the **calling** function. In this example, approx_pi didn't need 2.622
overhead is **not** added to the time spen
t
in the called function, but to the
time spen
t
in the **calling** function. In this example, approx_pi didn't need 2.622
seconds in the last run; but it called recip_square 10000000 times, each time taking a
little to set up profiling for it. This adds up to the massive time loss of
around 2.6 seconds. Having disable profiling for the often called function now
around 2.6 seconds. Having disable
d
profiling for the often called function now
reveals realistic timings for approx_pi; we could continue optimizing it now if
needed.
...
...
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