Programmers of message-passing codes for clusters of workstations face a daunting challenge in understanding the performance bottlenecks of their applications. This paper reports on the recent efforts developing a performance tool for MPI applications on Linux clusters. The target MPI implementations were LAM/MPI and MPICH2, both of which support portions of the MPI-2 Standard. The paper starts with an existing performance tool and added support for non-shared .le systems, MPI-2 one-sided communications, dynamic process creation, and MPI Object naming. This paper presents results using the enhanced version of the tool to examine the performance of several applications. The paper also describes a new performance tool benchmark suite it have developed, PPerfMark, and present results for the benchmark using the enhanced tool.
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