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.. sidebar:: ToC
.. contents::
.. _infra-misc-profile-programs:
Profiling Programs
==================
Linux Perf Tools (Linux)
------------------------
* https://perf.wiki.kernel.org/
* Requires ``echo '-1' > /proc/sys/kernel/perf_event_paranoid`` as root.
Useful commands:
* ``perf top`` - display ``top``-like display but on function granularity
* ``perf record PROGRAM`` - execute PROGRAM with profiling
* ``perf report PROGRAM`` - display report for PROGRAM
Google Perftools (Linux, Mac Os X)
----------------------------------
* Download and install https://code.google.com/p/gperftools/ (also available through Ubuntu/Debian packages)
* Compile your program with debug symbols (you probably want to enable optimization as well).
.. code-block:: console
# Tell the profiler where to write its output.
export CPUPROFILE=${OUT}
LD_PRELOAD="/usr/lib/libprofiler.so.0" ${PROGRAM} ${COMMAND_LINE}
google-pprof ${PROGRAM} ${OUT}
Interesting commands:
* ``gv``/``web`` - display weighted call graph in gv or in your browser
* ``top``/``topX`` - display top 10/X hitters
* ``disasm NAME`` - disassemble functions matching NAME
Instruments (Mac Os X)
----------------------
.. todo:: Write me!
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