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Re: [ptp-dev] Questions about Resource Manager restructure
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Hi Dave,
1) As you point out, the main advantage is to simplify the
installation of PTP. The other advantage is to make it easier to
support other MPI implementations, and in the future, other types of
resource managers.
2) The message traffic is likely to be reduced, since messages are no
longer required to create/update every model element. Also, the
messages are now arbitrary - you can implement your own protocol that
can attempt to be as efficient as you like. For Open MPI 1.3 and
later, we're using XML to communicate status change information and it
would be nice if we could standardize on this for different MPI
implementations.
3) No, the intention is to use the remote abstraction framework to run
the submission/control commands remotely (unless local commands are
available).
4) If RM implementations continue to use the old APIs then we will
continue to maintain them.
Regards,
Greg
On Aug 21, 2008, at 1:34 PM, Dave Wootton wrote:
I have some questions about the resource manager restructuring that we
talked briefly about during the last PTP conference call
1) An advantage of the restructuring was the elimination of the proxy,
which simplifies installs since there is no longer a special build
step
and the proxy doesn't have to be copied to other systems. Are there
other
advantages that would be a good reason for doing this?
2) Does this change help with the volume of message traffic between
Eclipse and the PE/LoadLeveler monitoring process for things like
node and
job status changes, maybe by a more efficient protocol?
3) Is the intent of this restructuring such that the parallel
application
or LoadLeveler submission is invoked directly on the same machine
(possibly a Windows or Mac system) where Eclipse is running? If so,
how do
we deal with this, since both PE and LoadLeveler have interfaces
that only
run on AIX or Linux. I think we still need an intermediate process
running
on AIX or Linux to handle the invocation of these types of
applications.
4) Do you intend to continue to maintain the existing resource manager
interfaces or will those go away in the future?
Dave
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