[mpiwg-rma] Zero byte RMA operations

[William Gropp]

I agree with Rajeev - this should be allowed.

Bill

William Gropp
Director, Parallel Computing Institute
Thomas M. Siebel Chair in Computer Science
Chief Scientist, NCSA
University of Illinois Urbana-Champaign





On Mar 30, 2016, at 11:05 AM, Thakur, Rajeev <thakur at mcs.anl.gov> wrote:

> I would say it is allowed. I am not aware of any language disallowing it.
> 
> Rajeev
> 
>> On Mar 30, 2016, at 10:58 AM, Balaji, Pavan <balaji at anl.gov> wrote:
>> 
>> 
>> Is it allowed for one to do a zero-byte RMA operation on a window of size 0?  I couldn't find any wording in the standard that disallows this.  If I missed something in the standard, I'd appreciate someone pointing out the page/line number specifying it.
>> 
>> The reason is that checking for this adds an extra branch on some networks, which we are trying to avoid.
>> 
>> Thanks,
>> 
>> -- Pavan
>> 
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