You Didn’t Fix the Fabric. You Just Made NCCL Wait Longer.
Why bigger InfiniBand timeout and retry values can turn a fast, diagnosable failure into a long, expensive silence. An RDMA timeout has a way of making engineers reach for a…
The Fabric Is Healthy. One Rail Is Not.
Why multi-rail AI clusters can hide one asymmetric path—and how to prove it without tuning by instinct. Multi-rail InfiniBand creates an uncomfortable troubleshooting problem: the cluster can have plenty of…