Re: Maximun number of neutron in a single run

[Per-Olof Åstrand <per-olof.aastrand@risoe.dk>]

Hi,

The problem pointed out by Ulrich will probably be quite serious for a lot of
users within a near future because of the rapid development of computer power,
and it is also a problem that is hard to find an easy work-around for the user. I
guess the obvious solution would be to divide the simulation into macro steps
(e.g. 10-100) where each macro step consists of a number micro steps (e.g
1e6-1e9). It would then also be fairly easy to include the possibility to carry
out a block-analysis of the simulation.

For the second problem with MAX_ELEMENTS, it is a never-ending problem to find a
number that is exceedingly large for all possible applications. I will find out
if there is a way to avoid using MAX_ELEMENTS or at least I will include a proper
warning message where it is specified where it can be modified.

I will include both points on the list of "Known problems" on the web-page.

Best regards,

Per-Olof Åstrand


--
Per-Olof Åstrand
Dept. of Chemistry, University of Copenhagen
and Materials Research Department, Risø National Laboratory
per-olof.aastrand@theory.ki.ku.dk or per-olof.aastrand@risoe.dk
http://www.ki.ku.dk and http://www.risoe.dk


Stephan Roth wrote:

> Hi,
>
> you have to change in
> list.c the following line to:
> #define MAX_ELEMENTS 2000
>
> and compile mcstas again. I had the same problem and solved it this way.
>
> Best regards
> Stephan
> --------------------------------
> Stephan V. Roth
> Technische Universitaet Muenchen
> Physik Department Lehrstuhl E13
> 85747 Garching
> Tel.: +49 (0)89-289-12883
> Fax : +49 (0)89-289-12473
> eMail: sroth@ph.tum.de
> --------------------------------
>
> On Fri, 9 Feb 2001, Judith Preston wrote:
>
> > Hi,
> >
> > A related issue that I discovered the other day is that the maximum number
> > of lines allowed in a component is 1000 lines. I know it is not often that
> > people need all this, but it does happen!!
> >
> > Cheers
> >
> > Judith
> >
> > ----- Original Message -----
> > From: "Ulrich C. Wildgruber MPI fuer Metallforschung Stuttgart"
> > <wildgrub@dxray.mpi-stuttgart.mpg.de>
> > To: <neutron-mc@risoe.dk>
> > Sent: Friday, February 09, 2001 8:46 AM
> > Subject: Maximun number of neutron in a single run
> >
> >
> > > Hi all,
> > >
> > > One new - but minor - issue came up here in Garching today. The maximum
> > > number of neutrons which can be processed in a single run is probably
> > > limited (I didn't try it out though for obvious reasons :-) to something
> > > like 2**31-1. Now I am getting to a point where I might need more...
> > >
> > > I suggest to introduce an additional counter which allows to process more
> > > neutrons than the number 'intmax'.
> > >
> > > Please let me know if there is already a simple solution to this problem
> > > (I like to avoid having to merge the output of several seperate runs
> > > manually)
> > >
> > > Regards
> > >
> > > Uli
> > >
> > > --
> > > Ulrich WILDGRUBER
> > > wildgrub@dxray.mpi-stuttgart.mpg.de
> > > wwwmf.mpi-stuttgart.mpg.de/abteilungen/dosch/dosch.html
> > > --------------------------------------------------------------------------
> > ---
> > > Max-Planck-Institut für Metallforschung | Technische Universität München
> > > Heisenbergstr. 1         | ZBE Neue Forschungs-Neutronenquelle
> > > | Instrumentierung
> > > D-70569 Stuttgart | D-85747 Garching/München
> > > Tel.: (+49)-711-689-1900 | Tel.: (+49)-89-289-14681
> > > Fax.: (+49)-711-689-1902 | Fax.: (+49)-89-289-14666
> > >
> >
> >