Dear Guido,
I regret that you are stepping back as a developer, but I have full
understanding for your personal situation. I think I speak of many
developers and active users of deal.II when I express my gratitude for
all your work and ideas that went into the project, especially regarding
the multigrid algorithms and abstractions for mesh loops that also
inspired our matrix-free algorithms. On a personal level, I remember our
discussions about multigrid algorithms and efficient preconditioning
going back to 2008 and 2009. Your code and your papers have been a key
step in developing my own research ideas. After I completed my Ph.D., we
intensified our interaction and have worked on several joint research
projects. I feel that many contributions to deal.II by me or Ph.D.
students under my supervision during the last decade have profited
enormously from your ideas, efforts and code sketches, even when you
were not as visible in the software repository any more.
I am looking forward to our future interaction, and hope that we as a
deal.II community will be able to integrate with as many of your
research results as possible, keep up your great work! I personally
share many of your interests on hardware-aware implementations, so I am
sure we will have time and resources to work for our mutual benefits.
Thank you, Guido!
Best regards,
Martin
On 25.11.22 09:38, Guido Kanschat wrote:
Dear Wolfgang,
Thanks for celebrating the day. I am more the person who forgets his
wedding anniversary and I would have missed this occasion as well.
I vividly remember our daily discussions about structuring classes,
which sometimes could take hours. Meanwhile, the office where this
took place does not exist anymore. On the next day, you had
implemented our plan and we had to discuss again because some things
did not work the way we had thought. This way we iterated towards a
structure that managed to live for 25 years.
I remember how we fought about the ordering of vertices in
quadrilaterals and how we later had to go through the painful process
of re-engineering this part in order to eliminate specializations with
respect to dimensions. As for the ordering of arguments, it was a
standard in C to have return arguments first. In C++ it is even
rationally justified, since a return argument in last position makes
it impossible to have a consistent ordering with optional arguments.
Dear all,
I would also like to make use of this day to announce my retirement
from the deal.II developer team. It was a great time and I enjoyed the
development very much. I have taught courses on deal.II on three
continents and enjoyed being its ambassador. Scientifically, I have
moved on towards hardware oriented implementations where we need much
more specialized software. Personally, my career has shifted towards
academic administration and my job as dean does not leave much time
for programming anyway.
I am happy that I am one of the fathers of deal.II, a child with a
surprisingly small number of mothers, and I have spent considerable
time and effort for it “in my time”. Now, is the time, where another
generation should take over and also get full credit for it. My advice
to you is: be fearless and not too respectful for the ancient, change
what you deem necessary to meet modern needs. But, do remember that
people are using deal.II and stick to the policy of changing the API
carefully and with sufficient warning time, since this has been a
trademark for deal.II for a long time and contributed to its success.
I wish you all another 25 years of happy and successful development,
Guido
--
Prof. Dr. Guido Kanschat
Dean of Engineering Sciences
Interdisciplinary Center for Scientific Computing (IWR)
Heidelberg University
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