Spatially Bursty I/O on Supercomputers: Causes, Impacts and Solutions

Understanding the I/O characteristics of supercomputers is crucial for grasping accurate I/O workloads and uncovering potential I/O inefficiency. We collect and analyze I/O traces from two production supercomputers, and find that the I/O traffic peaks in the system not only occur in short periods of time but also originate from a minority of adjacent compute nodes, which we call spatially bursty I...