Re: [Gretl-devel] MPI doc
Am 16.02.2015 um 09:22 schrieb Riccardo (Jack) Lucchetti:
On Mon, 16 Feb 2015, Sven Schreiber wrote:
> Good morning,
>
> is the help file for parallel MPI from June or July 2014 still current?
> The bootstrap example (which is very instructive) in there seems to me
> as if it could be simplified for straightforward "everyday" use. I want
> to make concrete suggestions, so I want to make sure I'm not referencing
> outdated stuff.
Yes, it should be ok. Is anything broken?
No (or at least I haven't found out yet), but I think the example is too
sophisticated. I mean, the example is excellent and shouldn't go away,
but IMO there should be something of the "Hello world" type, much
shorter. I will try to produce a minimal example.
In the meantime, two questions:
1) In the code snippet at the bottom of p.5, is "if $mpirank > 0"
correct, or should it rather be "if $mpirank == 0" ?
2) AFAICS the mpi block is encapsulated like a function body, that is no
variables/objects from outside the mpi block can be directly used
inside. The analogy to the "foreign" block is clearly explained, but
intuitively I think there is a difference: the mpi feature is supposed
to be part of gretl, so I do not quite like it that suddenly the scoping
rules within a hansl script change.
(IMHO the "foreign" block is a valid exception because the word
"foreign" itself is sufficiently self-explanatory that the user
understands that we are leaving the gretl world there.)
thanks,
sven