Charm++ parallel programming system

[Jeff Hammond <jeff.science AT gmail.com>]

> I suppose one solution would be to call MPI_Barrier directly, but I don't
> like that solution.  First of all, is it safe to do that from within my
> Charm++ code?  Will it always be safe in future versions of Charm++?  It
> seems like a dangerous use of undocumented functionality.  Also, the code
> would not be portable to Charm++ installs that were not compiled to use MPI.

Calling MPI from Charm++ is definitely not safe in the general case,
if for no other reason than you can't assume MPI is even linked into
the application.  Charm++ has native network ports (i.e. bypass MPI)
on a number of systems.  Furthermore, there is the obvious difference
in the execution model: MPI is a static execution model based off of
CSP.  Charm++ is decidedly not.

Best,

Jeff, who is not a Charm++ guru but claims some expertise in MPI

-- 
Jeff Hammond
jeff.science AT gmail.com
http://jeffhammond.github.io/