On Sep 23, 7:47 pm, Roy Lewallen wrote:
wrote:


I was recently told that the non-commercial NEC-4 license doesn't
include source code. I haven't confirmed this, but it's something you
should investigate before purchasing an NEC-4 license if you intend to
modify the source code.

My non-commercial copy included Source. I can't imagine that getting
only precompiled versions would be particularly useful, unless they're
willing to make a whole raft of versions (more than you get with the
release I got) with various values for the maximum segments, etc.

OTOH, LLL did just change management, so they assigned all the
licenses from UC to the new LLL management consortium, and maybe they
changed how it works for new licenses. The website still says to make
your check payable to Regents of UC

http://www.llnl.gov/ipac/technology/...titles/nec.php

And someday, Gerry Burke is going to retire, and whoever picks it up
from him may not be as willing and helpful to, for instance, recompile
peculiar versions for you.


You'll also, of course, need a Fortran compiler capable of compiling a
multi-threaded application.

That would be if you're doing finegrained parallelism (e.g. using a
multiprocessor BLAS library. Several of the strategies (dividing it
up by frequency) could actually be done by a reasonably simple shell
script/batch file that fires off the executable on different
processors with different input files. For my own NEC on a Cluster
runs, I've done the separate runs on separate machines and merge the
output files in post processing strategy.

Roy Lewallen, W7EL

Hello Roy,


That would be if you're doing finegrained parallelism (e.g. using a
multiprocessor BLAS library. Several of the strategies (dividing it
up by frequency) could actually be done by a reasonably simple shell
script/batch file that fires off the executable on different
processors with different input files. For my own NEC on a Cluster
runs, I've done the separate runs on separate machines and merge the
output files in post processing strategy.


Using Clusters, remembers me to my past university days. Indeed, I
used up to 20-60 personal computers on the computer centre, to compute
a ray-tracing movie. That was in the 90´th.
How do you handle the process communication? And how do you handle the
results?
There are more reasonably possibilities to speed up antenna
calculation and in special case of course optimizing too. The reason,
why I am want to speed up is, that antenna optimizing takes a lot of
time. I am often using the optimizing tool of 4nec2. It is a very nice
feature of 4nec2, to parameterize the antanne elements using
mathematical formulas. Anyone here, using this feature extensiv?
Aziz