Ugh, deep shame upon me and whoever reviewed my patch! Lisandro is correct. :) For accumulate ops, the op can also cause a buffer to be ignored (e.g. GACC/FOP with NO_OP). I think there is code to handle this, but keep an eye out for it. ~Jim. On 05/29/2013 03:08 PM, Lisandro Dalcin wrote:

On 29 May 2013 22:49, Jeff Hammond <[email protected]> wrote:

...

It seems that I didn't understand MPI_BOTTOM completely, so the error checks needed to be different than described below, but the high-level issues are the same.

Interested parties may consult http://trac.mpich.org/projects/mpich/ticket/1863 for details and further discussion.

Please take a look at the macro MPIR_ERRTEST_USERBUFFER .

-- Lisandro Dalcin --------------- CIMEC (INTEC/CONICET-UNL) Predio CONICET-Santa Fe Colectora RN 168 Km 472, Paraje El Pozo 3000 Santa Fe, Argentina Tel: +54-342-4511594 (ext 1011) Tel/Fax: +54-342-4511169