[Swift-devel] LQCD mapping

[Ben Clifford]

On Tue, 1 May 2007, Yong Zhao wrote:

> does create mean creating an empty file?

it doesn't create any file - it creates mappings that this mapper appears 
to not make by default (though mihael suggests that might be a bug)

so that if I refer to an array element  lattice[787979]  it is mapped to a 
(possibly non-existing) file called prefix+"787979"+suffix

if that is then used as the output variable for a procedure, then yes the 
file gets created by the procedure. but not by the mapper.

> 
> On Tue, 1 May 2007, Ben Clifford wrote:
> 
> >
> > yesterday evening I played some with Nika trying to get her LQCD workflow
> > running some more.
> >
> > It involved one code change to swift:
> >
> > I put a 'create' option on the filesys_mapper so that one can do this:
> >
> >   file lattice[] <filesys_mapper;prefix="lattice.",create=true>;
> >   foreach i in range {
> >     int j=i-1;
> >     lattice[i] = lqcd_exec(test_in,lattice[j]);
> >   }
> >
> > where lattice.* files don't exist, so that lattice[5] will map to
> > "lattice.5". With create=false (the default) then the mapper behaves as
> > before, which seems to be essentially an input-only mode where it creates
> > an array based on existing files.
> >
> > I think this is the mapping functionality that I want, but its not clear
> > to me whether filesys_mapper is the place for it, whether one of the other
> > mappers already does this, or if it should go in a different place
> > (another mapper or a new mapper). comments?
> >
> > --
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> > Swift-devel at ci.uchicago.edu
> > http://mail.ci.uchicago.edu/mailman/listinfo/swift-devel
> >
> 
>