Christoph, I do not know how to fix this, but here are some suggestions/thoughts
- do you need the -f flag ? if not, just remote it - what if you mpirun strace -o /dev/null ... ? - if the former works, then you might want to redirect the strace output to a local file (mpirun wrapper.sh, in which wrapper.sh sets the output file based on $PMIX_RANK or $$, and then exec strace ... Cheers, Gilles On Sat, Mar 30, 2019 at 6:29 PM Christoph Niethammer <nietham...@hlrs.de> wrote: > > 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
