[Developers] Re: [CactusMaint] ActiveThorns docs bug (fwd)

[Erik Schnetter]

On Saturday 04 June 2005 14:54, Jonathan Thornburg wrote:
> > The Cactus Users' Guide section A3.2 "Parameter File Syntax",
> > doesn't fully describe how ActiveThorns lines work.  In
> > particular:
> > * It should say that there can be multiple ActiveThorns
> >   lines.
> > * It should say that listing the same thorn multiple
> >   times in one or more ActiveThorns lines is a harmless
> >   no-op.
> > * It should describe the (rather complicated!) rules
> >   determining the orders in which thorns may or may not
> >   appear in ActiveThorns lines.
>
> (If the rules for that last part are unclear, we should discuss them
> on  developers at cactuscode.org .)

The rules seem to be straightforward: If a thorn needs some other 
thorns, then these other thorns must be activated before that thorn.

Such needs come from: inheritance declarations in interface.ccl, 
parameter sharing in param.ccl, and required capabilities in 
configuration.ccl.

It should be documented, but the rules do not seem complicated.

What is complicated is figuring out these dependencies from scratch.  
What about a command line option to Cactus that prints all thorn 
dependencies for a single thorn, and the closure of that?

-erik

-- 
Erik Schnetter <schnetter at aei.mpg.de>   http://www.aei.mpg.de/~eschnett/

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