Add --mca btl ^tcp to your mpirun command line. It shouldn't be used on a Cray.
> On Mar 30, 2019, at 2:00 PM, Christoph Niethammer <nietham...@hlrs.de> wrote: > > Short update: > > The polled file descriptor is related to a socket, which I identified to be > the local tcp btl connection ... > On a Lustre file system the problem does not show up. > > Best > Christoph > > ----- Mensaje original ----- > De: "niethammer" <nietham...@hlrs.de> > Para: "Open MPI Users" <users@lists.open-mpi.org> > Enviados: Sábado, 30 de Marzo 2019 10:25:49 > Asunto: [OMPI users] Using strace with Open MPI on Cray > > Hello, > > I was trying to investigate some processes with strace under Open MPI. > However I have some issues when MPI I/O functionality is included writing > data to a NFS file system. > > mpirun -np 2 strace -f ./hello-world mpi-io > > does not return and strace is stuck reporting infinite "poll" calls. > However, the program works fine without strace. > > I tried with Open MPI 3.x and 4.0.1 switching between ompi and romio on > different operating systems (CentOS 7.6, SLES 12). > > I'd appreciate any hints which help me to understand what is going on. > > Best > Christoph > > -- > > Christoph Niethammer > High Performance Computing Center Stuttgart (HLRS) > Nobelstrasse 19 > 70569 Stuttgart > > Tel: ++49(0)711-685-87203 > email: nietham...@hlrs.de > http://www.hlrs.de/people/niethammer > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
