Michael, I could not reproduce the problem with MPICH master. I checked MPICH's F90 binding of this routine. It looks good. There are C tests for this routine in MPICH test suite. They also ran fine. Could you either upgrade your MPI to MPICH-3.1.3 or send me your test case? Thanks. --Junchao Zhang On Fri, Dec 12, 2014 at 4:53 AM, <[email protected]> wrote:

Dear developers of MPICH,

I am running MPICH-3.0.4 with a Fortran95-code on a LINUX-cluster using the INTEL-14.0.1 Ftn-compiler.

In that code I employ the shared memory feature (using MPI_WIN_ALLOCATE_SHARED and MPI_WIN_SHARED_QUERY).

It works fine, but nevertheless I detected a little bug in MPI_WIN_SHARED_QUERY:

MPI_WIN_SHARED_QUERY(WIN, RANK, SIZE, DISP_UNIT, BASEPTR, IERROR)

The MPI-3.0 Standard document (chapter 11.2, on p. 410) prescribes that the 4th parameter DISP_UNIT is a result from the call of this sbr.

However, with MPICH no value is returned for DISP_UNIT.

You can easily test that, by setting DISP_UNIT to a control number ( e.g. DISP_UNIT = -7777 ) just before the call of sbr MPI_WIN_SHARED_QUERY.

Just after that sbr-call the variable DISP_UNIT still contains that control number, but should not.

Greetings

Michael Rachner

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