Benjamin Jamroz

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As traffic patterns and network topologies become more and more complicated in current enterprise data centers and TOP500 supercomputers, the probability of network congestion increases. If no countermeasures are taken, network congestion causes long communication delays and degrades network performance. A congestion control mechanism is often provided to(More)
The InfiniBand Congestion Control (CC) mechanism is able to reduce congestion and improve performance in many situations. In this paper we study the characteristics of congestion in InfiniBand by monitoring and analyzing the CC mechanism with a hardware analyzer. To the best of our knowledge, this is the first paper that presents experience with, and(More)
Modern numerical simulations often require solving extremely large sparse linear systems. Solving these linear systems using Krylov iterative methods requires repeated sparse matrix-vector multiplications which can be the most computationally expensive part of the simulation. Since Graphics Processing Units (GPUs) provide a significant increase in floating(More)
Many high-performance distributed memory applications rely on point-to-point messaging using the Message Passing Interface (MPI). Due to the latency of the network, and other costs, this communication can limit the scalability of an application when run on high node counts of distributed memory supercomputers. Communication costs are further increased on(More)
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