I'm setting up a cluster on AWS, which will have a 10Gb/s or 25Gb/s Ethernet network. Should I expect to be able to get RoCE to work in Open MPI on AWS?
More generally, what optimizations and performance tuning can I do to an Open MPI installation to get good performance on an Ethernet network? My codes use a lot of random access AMOs and asynchronous block transfers, so it seems to me like setting up RDMA over Ethernet would be essential to getting good performance, but I can't seem to find much information about it online. Any pointers you have would be appreciated. Ben
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