[mpiwg-hybridpm] Endpoints

Balaji, Pavan balaji at anl.gov
Thu Mar 6 09:51:16 CST 2014


I’m pretty sure that’s not correct.  You can have large collective ops and other operations in the callbacks.  HDF5 and PETSc do all sorts of stuff in these callbacks.

  — Pavan

On Mar 6, 2014, at 9:39 AM, Jim Dinan <james.dinan at gmail.com> wrote:

> I believe that the copy and free attribute callbacks are intended to be local functions that deal with objects the user has attached as attributes, that might need to be copied or freed.  Can't find text that confirms this explicitly, though..
> 
> 
> On Wed, Mar 5, 2014 at 6:31 PM, Balaji, Pavan <balaji at anl.gov> wrote:
> 
> The endpoints proposal says that Comm_free is not fully synchronizing.  What happens if I have an attribute callback on that communicator which does a Bcast?  How will that work?
> 
>   — Pavan
> 
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