mirror of https://github.com/CGAL/cgal
37 lines
1.6 KiB
TeX
37 lines
1.6 KiB
TeX
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\section{Timers}
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\cgal\ provides classes for measuring the user process time and the real time.
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The class \ccc{CGAL::Timer} is the version for the user process time and
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the class \ccc{CGAL::Real\_timer} is the version for the real time.
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Instantiations of both classes are objects with a state. The state is
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either {\em running\/} or it is {\em stopped}. The state of an object
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\ccc{t} is controlled
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with \ccStyle{t.start()} and \ccStyle{t.stop()} . The timer counts the
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time elapsed since its creation or last reset. It counts only the time
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where it is in the running state. The time information is given in seconds.
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The timer counts also the number of intervals it was running, i.e. it
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counts the number of calls of the \ccc{start()} member function since the
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last reset. If the reset occurs while the timer is running it counts as the
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first interval.
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\section{Memory Size}
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\cgal\ provides access to the memory size used by the program with the
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\ccc{CGAL::Memory_sizer} class. Both the virtual memory size and the
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resident size are available (the resident size does not account for
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swapped out memory nor for the memory which is not yet paged-in).
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\section{Profiling}
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\cgal\ provides a way to count the number of times a given line of code
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is executed during the execution of a program. Such
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\ccc{CGAL::Profile_counter} counters can be added at critical place in the
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code, and at the end of the execution of a program, the count is printed on
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\ccc{std::cerr}. A macro \ccc{CGAL_PROFILER} can be used to conveniently place
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these counters anywhere. They are disabled by default and activated by the
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global macro \ccc{CGAL_PROFILE}.
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% EOF
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