[Beowulf] Teaching Scientific Computation (looking for the perfect text)

Peter St. John peter.st.john at gmail.com
Tue Nov 20 14:30:57 EST 2007


Nathan,
I'm sure you'll get lots of very experienced responses but if I may:
1. Book. K&RC is the best book ever, on any subject.
2. Demographics. It looked to me that engineers were typically
learning and using C (C++, C with Classes, sometimes Java) more than
Fortran. I would have expected similar among physicists, but I
understand that a lot of Fortan is still extant and vital. Also there
is some convergence, ultimately it won't matter much.
3. Pedagogy. When computational efficiency is important, the
distinctions bettween sending data, and sending references to data, is
real important. I think it can be made vivid, early; what's the
difference between my handing you a card with the shipping address of
the warehouse that has the gravel you need for your construction
business, and handing you one thousand wheelbarrows full of gravel?
Either way can be right in the circumstances, but the difference is
obviously very relevant and should be taught even if you use a
language that hides the distinctions.
4. You might let them choose, but that might make more sense with
graduate students, than undergrads, and you may not like grading
papers in multiple languages. So you might ask about departmental
guidelines, what languages they will be exprected to learn anyway. I'd
advocate presenting some of the shorter but fundamental algorithms in
two languages, if you have time, but time is scarce and it's a physics
course, not a programming course.
5. Choose C because there is no real choice, but I don't have time to
explain that in the margin of my email :-)
Peter


On Nov 20, 2007 1:33 PM, Nathan Moore <ntmoore at gmail.com> wrote:
> I regularly teach a college course in a physics department that deals with
> scientific computation.  After students take the course, I expect that
> they'll be able to write simple "c-tran" style programs for data analysis,
> write basic MD or MC simulations, and be fairly fluent in Mathematica.
>
> In the past, I figured that with the breadth of topics included in the
> course, Fortran, specifically the basic, simple, and reliable F77 dialect
> (w/ some F90 conveniences) was the language to teach.  In my own head, my
> rationale was:
> - Most students can grasp the basics of fortran in half a day's reading, so
> I can spend more class time on science and math (probably because there are
> no pointers - I think that C is much harder for students and sometimes
> "seems" less like mathematical syntax than f77)
> - "Classical Fortran" is a great text and is readable for self-study (I know
> of no such text for C/C++)
> - several free compilers exist (g95 seems ok so far)
> - Netlib, lapack, and numerical recipes cover the math library adequately
> - F77 is compiled (Perl/python are too slow for an MD/MC sim and I figure
> that students should know at least on compiled language and one scripting
> language to be competent)
> - MPI is a relatively basic addition to the language (again, no pointers,
> allocation, or addressing)
>
> After reflection though, I've started to wonder about the wisdom of my
> choice.  Specifically (like RGB), I love the GSL library, and extending GSL
> to fortran in an intro class is non-trivial.  Additionally, most vendors
> supply "fast" hardware libraries in C (I may be ignorant, but if a student
> wants to call an AMD ACML fast-math function(
> http://developer.amd.com/acml.jsp), or write a linear algebra function to
> run on a graphics card(http://developer.nvidia.com/object/cuda.html ), the
> vendors seem to assume that you'll write the code in C).
>
> Also, and more relevant, I assume that most employers word-associate
> "Fortran is to backwards as C is to competence".
>
> So, I'm thinking about reworking the class to favor C, and fearing 3 weeks
> of pointer and addressing hell.  For those of you who teach scientific
> computation (and also those of you who hire undergrads), I'd be grateful for
> your thoughts.  One specific question I have is what text covers scientific
> programming and touches on MPI using the C language.
>
> regards,
>
> Nathan Moore
>
>
> --
> - - - - - - -   - - - - - - -   - - - - - - -
> Nathan Moore
> Assistant Professor, Physics
> Winona State University
> AIM: nmoorewsu
> - - - - - - -   - - - - - - -   - - - - - - -
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