A growing trend in developing large and complex applications on today’s
Teraflop-scale computers is to integrate standalone and/or semi-independent program
components into a comprehensive simulation package. One example is the Community
Climate System Model, which consists of atmosphere, ocean, land-surface, and sea ice
components. Each component is semi-independent and has been developed at a different
institution. We study how this multicomponent, multi-executable application can run
effectively on distributed memory architectures. For the first time, we clearly
identify five effective execution modes and develop the MPH library to support
application development utilizing these modes. MPH performs component-name
registration, resource allocation and initial component handshaking in a flexible way.
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