All,
I installed Open MPI 3.1.2 on my laptop today (up from 3.0.0, which
worked fine) and ran into the following error when trying to create a
window:
```
--------------------------------------------------------------------------
The OSC pt2pt component does not support MPI_THREAD_MULTIPLE in this
release.
Workarounds are to run on a single node, or to use a system with an RDMA
capable network such as Infiniband.
--------------------------------------------------------------------------
[beryl:13894] *** An error occurred in MPI_Win_create
[beryl:13894] *** reported by process [2678849537,0]
[beryl:13894] *** on communicator MPI COMMUNICATOR 3 DUP FROM 0
[beryl:13894] *** MPI_ERR_WIN: invalid window
[beryl:13894] *** MPI_ERRORS_ARE_FATAL (processes in this communicator
will now abort,
[beryl:13894] *** and potentially your MPI job)
```
I remember seeing this announced in the release notes. I wonder,
however, why the pt2pt component is required for a run on a single node
(as suggested by the error message). I tried to disable the pt2pt
component, which gives a similar error but without the message about the
pt2pt component:
```
$ mpirun -n 4 --mca osc ^pt2pt ./a.out
[beryl:13738] *** An error occurred in MPI_Win_create
[beryl:13738] *** reported by process [2621964289,0]
[beryl:13738] *** on communicator MPI COMMUNICATOR 3 DUP FROM 0
[beryl:13738] *** MPI_ERR_WIN: invalid window
[beryl:13738] *** MPI_ERRORS_ARE_FATAL (processes in this communicator
will now abort,
[beryl:13738] *** and potentially your MPI job)
```
Is this a known issue with v3.1.2? Is there a way to get more
information about what is going wrong in the second case. Is this the
right way to disable the pt2pt component?
Cheers,
Joseph
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