Pascal Boeschoten

Thanks, I see. Is UCX itself unable to do non-contiguous zero-copy (either intra-node or inter-node), or is it not supported on the OMPI/MPICH side? Not having zero-copy for non-contiguous sends...

@yosefe Thanks, that's good to know. @bosilca To give a bit more context, we've observed that when sending many large and complex data structures (similar to the one in the...

Yes, it's with debug symbols. I did some digging around, hopefully this will be useful. It crashes in `./nptl/nptl_deallocate_tsd.c:73` which is this bit: https://github.com/bminor/glibc/blob/glibc-2.35/nptl/nptl_deallocate_tsd.c#L73. I think it destroys thread-local variables...

After removing those (at L334, L551) I no longer get the segfault.

Does that indicate an issue with the graphics driver?

Hello, thank you for getting back to me! I've made a similar feature request for OpenMPI (https://github.com/open-mpi/ompi/issues/12536), hope it's okay if I just add the same information I gave there:...