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

[Jeffrey D. Oldham]

Richard Guenther wrote:
> 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)?

OK.

> Thanks,
> 
> Richard.


-- 
Jeffrey D. Oldham
oldham at codesourcery.com