Over the last decade, InfiniBand (IB) has become an increasingly popular interconnect for deploying modern supercomputing systems. As supercom-puting systems grow in size and scale, the impact of IB network topology on the performance of high performance computing (HPC) applications also increase. Depending on the kind of network (FAT Tree, Tori, or Mesh), the number of network hops involved in data transfer varies. No tool currently exists that allows users of such large-scale clusters to analyze and visualize the communication pattern of HPC applications in a network topology-aware manner. In this paper, we take up this challenge and design a scalable, low-overhead InfiniBand Network Topology-Aware Performance Analysis Tool for MPI - INTAP-MPI. INTAP-MPI allows users to analyze and visualize the communication pattern of HPC applications on any IB network (FAT Tree, Tori, or Mesh). We integrate INTAP-MPI into the MVAPICH2 MPI library, allowing users of HPC clusters to seamlessly use it for analyzing their applications. Our experimental analysis shows that the INTAP-MPI is able to profile and visualize the communication pattern of applications with very low memory and performance overhead at scale.
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