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Subject: Re: [OMPI devel] [PATCH] openib btl: extensable cpc selection enablement
From: Jon Mason (jon_at_[hidden])
Date: 2008-01-10 11:50:22

On Thu, Jan 10, 2008 at 11:17:48AM +0200, Pavel Shamis (Pasha) wrote:
> Jon Mason wrote:
> > The new cpc selection framework is now in place. The patch below allows
> > for dynamic selection of cpc methods based on what is available. It
> > also allows for inclusion/exclusions of methods. It even futher allows
> > for modifying the priorities of certain cpc methods to better determine
> > the optimal cpc method.
> >
> > This patch also contains XRC compile time disablement (per Jeff's
> > patch).
> >
> Need make sure that CM stuff will be disabled during compile tine if it
> is not installed on machine.

Oh, xoob doesn't show up at all for me. So I'd say it is working. :-)

> > At a high level, the cpc selections works by walking through each cpc
> > and allowing it to test to see if it is permissable to run on this
> > mpirun. It returns a priority if it is permissable or a -1 if not. All
> > of the cpc names and priorities are rolled into a string. This string
> > is then encapsulated in a message and passed around all the ompi
> > processes. Once received and unpacked, the list received is compared
> > to a local copy of the list. The connection method is chosen by
> > comparing the lists passed around to all nodes via modex with the list
> > generated locally. Any non-negative number is a potentially valid
> > connection method. The method below of determining the optimal
> > connection method is to take the cross-section of the two lists. The
> > highest single value (and the other side being non-negative) is selected
> > as the cpc method.
> >
> > Please test it out. The tree can be found at
> >
> >
> > This patch has been tested with IB and iWARP adapters on a 2 node system
> > (with it correctly choosing to use oob and happily ignoring iWARP
> > adapters). It needs XRC testing and testing of larger node systems.
> >
> Did you run MTT over all thess changes ?

No I did not. My thinking was that since this is just setting up the
connections, it'll either work or not. Since MTT is more functional
testing, it wouldn't really stress it. But it could be false reasoning
on my part. My main test was running the full IMB suite on it.

Of course, as soon as I get rdma cm in a working state, I'll be running
MTT to stress that.

> I have few machines with connectX and i will try to run MTT on Sunday.

Awesome! I appreciate it.


> --
> Pavel Shamis (Pasha)
> Mellanox Technologies
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