Abstract. This paper proposes an interface that will allow MPI 2 dynamic programs -those using MPI SPAWN, CONNECT/ACCEPT, or JOIN -to provide information to parallel debuggers such as TotalView about the set of processes that constitute an individual application. The TotalView parallel debugger currently obtains information about the identity of processes directly from the MPI library using a widely accepted proctable interface. The existing interface does not support MPI 2 dynamic operations. The proposed interface supports MPI 2 dynamic operations, subset debugging, and helps the parallel debugger assign meaningful names to processes.

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An extreme scale system is one that is one thousand times more capable than a current comparable system, with the same power and physical footprint. Intuitively, this means that the power consumption and physical footprint of a current departmental server should be enough to deliver petascale performance, and that a single, commodity chip should deliver terascale performance. In this panel, we will discuss the resulting challenges in energy/power efficiency, concurrency and locality, resiliency and programmability, and the research opportunities that may take us to extreme scale systems.

An extreme scale system is one that is one thousand times more capable than a current comparable system, with the same power and physical footprint. Intuitively, this means that the power consumption and physical footprint of a current departmental server should be enough to deliver petascale performance, and that a single, commodity chip should deliver terascale performance. In this panel, we will discuss the resulting challenges in energy/power efficiency, concurrency and locality, resiliency and programmability, and the research opportunities that may take us to extreme scale systems.987-1-4244-5659-8/09/$25.00 ©2009 IEEE