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Network congestion is one of the biggest problems facing HPC systems today, affecting system throughput, performance, user experience, and reproducibility. Congestion manifests as run-to-run variability due to contention for shared resources (e.g., filesystems) or routes between compute endpoints. Despite its significance, current network benchmarks fail to proxy the real-world network utilization seen on congested systems. We propose a new open-source benchmark suite called the Globaldoi:10.1145/3295500.3356215 dblp:conf/sc/ChunduriGMABKKL19 fatcat:yb7ctm77xjddvlwp2dlujnnpxm