{Martin Ruckert}
{Profiling to \TeX\ input files}
{A profiler is a standard tool for programmers.
It can be used to find out how a program is using its time
by mapping the use of runtime to individual lines of code.
Applying a such a standard tool to a run of \TeX\
might tell you that it spends 28\% on line breaking,
20\% in the main loop, 19\% on memory management,
and 18\% on generating the output file.
This information might be of use if you implement a \TeX\ engine;
it is nearly useless for someone implementing a \TeX\ package.

To remedy this situation, I have implemented a new profiler for
\TeX\ that maps the use of runtime to individual lines of \TeX's
input files. The talk will present this new tool and gives examples
of its use.}