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From: FEVOTTE F. <fra...@ed...> - 2017-05-29 11:21:08
|
Dear Valgrind developers,
first, please forgive us if this post is out of place in this list.
We would like to introduce Verrou [1], a floating-point error diagnostics tool based on Valgrind. The idea behind the tool is that it replaces all floating-point operations by randomly rounded ones (which means that instead of always rounding non-representable results to the nearest floating-point number, one of the two nearest floating-point numbers is chosen randomly). Instrumented program results thus become realizations of a random variable, the dispersion of which gives an estimation of the impact of the accumulation of floating-point round-off errors during program execution. In the computer arithmetic community, this technique is known as an asynchronous CESTAC method, which is a variant of Monte-Carlo arithmetic. More details can be found in Verrou's user manual [2].
This work was pursued at EDF R&D [3], but we think such a tool might be of broader interest, especially since Valgrind's "Project Suggestions" page lists the detection of floating-point inaccuracies as a topic of interest. We also would like to take the opportunity of this message to thank Josef Weidendorfer, who kindly helped us getting started with the development of a new Valgrind tool, back when this project began in 2014. We just released (under the GPLv2) version 1.0.0 of Verrou, which we believe to be stable enough for others to use. So please let us know of any comments you might have about this tool.
In any case, many thanks to the Valgrind development team: Verrou would not exist without your outstanding work. And the other codes we develop would be a lot buggier and less performant if it were not for Valgrind tools...
François Févotte and Bruno Lathuilière
[1] http://github.com/edf-hpc/verrou
[2] http://edf-hpc.github.io/verrou/vr-manual.html
[3] EDF is France's main electricity utility. Its R&D department develops a lot of numerical simulation softwares, which are used in crucial parts of our industrial process.
--
[cid:149...@ed...]
François FÉVOTTE
Research Engineer
EDF – R&D – PERICLES
I23 (Analysis and Numerical Modeling)
7 boulevard Gaspard Monge
91120 Palaiseau
fra...@ed...
Phone: +33 1 78 19 44 23
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