Coupling DSM-Based Parallel Applications

When coupling applications running on distributed memory architectures or clusters, the coupling library must adapt to the distribution of the data in the memory of each computation node. The library must be prepared to redistribute the data when the coupled applications use different data mappings or when the number of processors of the two architectures are different. Mome is a user-level software DSM which allows programs running on a distributed memory architecture or cluster to create segments and to share data objects through memory mapping. The segments of the DSM form a simple linear address space where all shared objects of applications are allocated. The Mome coupling library accesses the data through mappings of the DSM segments on the memories of the communication threads. The parallel communication threads are distributed on the computation nodes and exploit the communication capacity of each processor. The data are moved directly between the DSM segments and the transfers do not rely on any knowledge on the application use of these segments. Key-words: DSM, memory mapping, code coupling, parallel communication.