I recommend filing the bug regarding the supported MPI.  I can't find any statement in the MPI standard indicating it shouldn't work.

Jeff

On Thu, Mar 30, 2017 at 8:34 AM, Sebastian Rinke <rinke@cs.tu-darmstadt.de> wrote:

Thanks a lot for your answer!

The same problem occurs in the supported MPI-2.2 on BGQ.

Ok, I will try the OFI-based MPI-3.

Thanks,

Sebastian

On 30 Mar 2017, at 17:12, Jeff Hammond <jeff.science@gmail.com> wrote:

I guess this is a bug but MPICH 3.1.x isn't the basis for the supported MPI on BGQ, so I doubt you will get much traction by reporting it.  IBM made an effort to support MPI-3 with PAMID but it was as an open-source, best effort project, and I recall there were some issues with it, including deadlock in certain asynchronous operations.

You should try the supported MPI-2.2 implementation on BGQ or try the unsupported OFI-based implementation of MPI-3.

Disclaimer: The comments above are spoken in my capacity as the person who used to support MPI at ALCF, not my current job role.

Best,

Jeff

On Thu, Mar 30, 2017 at 3:21 AM, Sebastian Rinke <rinke@cs.tu-darmstadt.de> wrote:

Same window, i.e.:

Process 0:

Win_lock(MPI_LOCK_SHARED, target=A, window=win)

Win_lock(MPI_LOCK_SHARED, target=B, window=win)

Sebastian

On 30 Mar 2017, at 06:24, Jeff Hammond <jeff.science@gmail.com> wrote:

Same window or different windows?

Jeff

On Wed, Mar 29, 2017 at 5:59 PM Sebastian Rinke <rinke@cs.tu-darmstadt.de> wrote:

Dear all,

I have some issue with MPI_Win_lock in MPICH-3.1.4 on Blue Gene/Q.

Here is my example:

Process 0:

Win_lock(MPI_LOCK_SHARED, target=A)
Win_lock(MPI_LOCK_SHARED, target=B)

No matter what I use for A and B (given A != B), a process cannot acquire more than one lock
at a time.

To my understanding, it should be possible to acquire more than one lock.

Can you confirm this issue?

Thanks,
Sebastian
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