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Kirill Smelkov
cpython
Commits
da264121
Commit
da264121
authored
Dec 19, 2004
by
Raymond Hettinger
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Bug #1066607: "Limitations" section of profiler docs is incorrect
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3a4231dd
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Doc/lib/libprofile.tex
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da264121
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@@ -528,16 +528,7 @@ ordering are identical to the \method{print_callers()} method.
\section
{
Limitations
\label
{
profile-limits
}}
There are two fundamental limitations on this profiler. The first is
that it relies on the Python interpreter to dispatch
\dfn
{
call
}
,
\dfn
{
return
}
, and
\dfn
{
exception
}
events. Compiled
\C
{}
code does not
get interpreted, and hence is ``invisible'' to the profiler. All time
spent in
\C
{}
code (including built-in functions) will be charged to the
Python function that invoked the
\C
{}
code. If the
\C
{}
code calls out
to some native Python code, then those calls will be profiled
properly.
The second limitation has to do with accuracy of timing information.
One limitation has to do with accuracy of timing information.
There is a fundamental problem with deterministic profilers involving
accuracy. The most obvious restriction is that the underlying ``clock''
is only ticking at a rate (typically) of about .001 seconds. Hence no
...
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