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Diffstat (limited to 'Doc/lib/libtime.tex')
| -rw-r--r-- | Doc/lib/libtime.tex | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/Doc/lib/libtime.tex b/Doc/lib/libtime.tex index 82953db..6823d5f 100644 --- a/Doc/lib/libtime.tex +++ b/Doc/lib/libtime.tex @@ -126,12 +126,18 @@ the C function of the same name, there is no trailing newline. \end{funcdesc} \begin{funcdesc}{clock}{} -Return the current processor time as a floating point number expressed in +On \UNIX, return +the current processor time as a floating point number expressed in seconds. The precision, and in fact the very definition of the meaning -of ``processor time''\index{CPU time}\index{processor time}, depends on -that of the C function of the same name, but in any case, this is the -function to use for benchmarking\index{benchmarking} Python or timing -algorithms. +of ``processor time''\index{CPU time}\index{processor time}, depends +on that of the C function of the same name, but in any case, this is +the function to use for benchmarking\index{benchmarking} Python or +timing algorithms. + +On Windows, this function returns the nearest approximation to +wall-clock time since the first call to this function, based on the +Win32 function \cfunction{QueryPerformanceCounter()}. The resolution +is typically better than one microsecond. \end{funcdesc} \begin{funcdesc}{ctime}{\optional{secs}} |