I agree with Jeff - this is a simple errata item to be fixed.

Bill

William Gropp
Acting Director and Chief Scientist, NCSA

Director, Parallel Computing Institute
Thomas M. Siebel Chair in Computer Science
University of Illinois Urbana-Champaign

On Sep 13, 2016, at 8:09 AM, Jeff Hammond <jeff.science@gmail.com> wrote:

This is a bug in the text that should be fixed by an erratum.

Jeff

Sent from my iPhone

On Sep 13, 2016, at 5:36 AM, Rolf Rabenseifner <rabenseifner@hlrs.de> wrote:

Hello,

my colleague Joseph detected that an MPI implementation is allowed
to not allow passive target communication/synchronization (i.e.,
all forms of MPI_Lock and Unlock) on MPI shared memory windows.

Was it intented or is it only a historical review-bug that
MPI_WIN_ALLOCATE_SHARED was never added to the list of
MPI_ALLOC_MEM (since MPI-2.0), and MPI_WIN_ALLOCATE &
MPI_WIN_ATTACH (since MPI-3.0) in the following text.


MPI-3.1 Sect. 11.5.3 on page 448 lines 1-12 say

"Implementors may restrict the use of RMA communication
that is synchronized by lock calls to windows in
memory allocated by MPI_ALLOC_MEM (Section 8.2),
MPI_WIN_ALLOCATE (Section 11.2.2), or attached with
MPI_WIN_ATTACH (Section 11.2.4).
Locks can be used portably only in such memory.

Rationale. The implementation of passive target
communication when Memory is not shared may require
an asynchronous software agent. Such an agent can be
implemented more easily, and can achieve better
performance, if restricted to specially allocated memory.
It can be avoided altogether if shared memory is used.
It seems natural to impose restrictions that allows
one to use shared memory for third party communication
in shared memory machines.
(End of rationale.)"


The rationale not really fits to the current state
that MPI_WIN_ALLOCATE_SHARED is missing in the list.
It would fit if MPI_WIN_ALLOCATE_SHARED would be added
to the list.

Best regards
Rolf

--
Dr. Rolf Rabenseifner . . . . . . . . . .. email rabenseifner@hlrs.de
High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530
University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832
Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner
Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307)
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