[Swift-devel] LQCD mapping

[Ben Clifford]

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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