gasnetc_ofi_init failure on Frontier/Crusher with 1 node

[elliottslaughter]

This is to document a known issue with Slingshot 11 network. Legion runs hit an error if you use only 1 node:

*** FATAL ERROR (proc 0): in gasnetc_ofi_init() at .../gasnet_ofi.c:946: fi_domain failed: -38(Function not implemented)

I have been told that this is an issue with the SLURM integration, and therefore is not something that Legion/GASNet are in a position to directly address.

In the meantime, I'm aware of two workarounds:

1. Use 2 or more nodes
2. Run with srun --network=single_node_vni

I will update this issue when the workarounds are no longer required.

Edit: I understand that the issue is related to SLURM settings at OLCF, not necessarily to Slingshot 11 per se.