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PC grids represent massive computation capacity at a low cost, but are challenging to employ for parallel computing because of variable and unpredictable performance and availability. A communicating parallel program must employ checkpoint-restart and/or process redundancy to make continuous forward progress in such an unreliable environment. A communication model based on one-sided Put/Get calls, pioneered by the Linda system, is a good match as processes can execute their communication operations independently and asynchronously. However, Linda and its many variants are not designed for communicating processes that are replicated or independently restarted from check-points.
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