[pooma-dev] Re: [PATCH] Optimize guard update copy

[Richard Guenther]

On Thu, 1 Jan 2004, Richard Guenther wrote:

> On Thu, 1 Jan 2004, Jeffrey D. Oldham wrote:
>
> > Richard Guenther wrote:
> > > Hi!
> > >
> > > This patch removes number four of the copies done for guard update.
> > > Basically, additionally to the three copies I mentioned in the previous
> > > mail, we're doing one extra during the RemoteView expressionApply of the
> > > data-parallel assignment we're doing for the guard domains. Ugh. Fixed by
> > > manually sending/receiving from/to the views.  Doesn't work for Cheetah,
> > > so conditionalized on POOMA_MPI.
> >
> > What breaks for Cheetah?
>
> I don't remember... I can try again next week.

I tried again, and with Cheetah this is really a mess, because Cheetah
cannot receive into a View, so we need to pass a Brick as IncomingView and
a BrickView as View to SendReceive<IncomingView>::receive<View>() and this
breaks all over the place in the Cheetah library...

So, unfortunately, no - this doesn't work for Cheetah - at least not with
major surgery inside the Cheetah library (which I would rather drop than
fix).

So, is the patch ok as it is (affecting only POOMA_MPI)?

Thanks,

Richard.