On Aug 8, 2005, at 6:31 PM, Jim Lasc wrote:
> And for a node, is there allso a method which isn't LAM-specific?
> Which can be used with all MPI-2 implementations?
Unfortunately, every MPI-2 implementation's version of this is
different. Since it's not included in the MPI-2 standard, this is
quite legal. The problem is that there are a *wide* variety of ways to
do this, most usually having to do with what kind of run-time
environment you're running in (e.g., what exactly does it mean to add a
node in a batch-scheduled environment? There are several possible
answers...).
> (can't you use allso OPEN_PORT, COMM_ACCEPT/CONNECT on the "new" node
> to connect it with a node which "allready knows what to do" ?
> Or are there any other methods?
In general, only the MPI API is standardized. MPI does not specify
even how parallel processes are started (nor anything about resource
allocation, etc.) -- it only specifies what the API calls do once an
MPI process is running. This is much like how the Fortran standard
does not specify how Fortran programs are started (in fact, the MPI
Forum got their inspiration from Fortran ;-) ).
--
{+} Jeff Squyres
{+} jsquyres_at_[hidden]
{+} http://www.lam-mpi.org/
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