Integrating Task Migration Capability in Software Tool-Chain for Data-Flow Applications Mapped on Multi-tiled Architectures

摘要

Fully distributed memory multi-processor systems-on-chip MPSoCs implemented in a multi-tiled architecture provide promising platforms to support parallel data-flow application. Tiles are connected by network-on-chip NoC, each contains a core with necessary peripherals and a communication device. Such systems are susceptible to reliability issues like thermal spots. Task migration still provides an effective system-level solution for such issues. An agent based task migration solution is designed to target tiled MPSoCs. These agents are responsible for executing migration. In order to execute task migration, a middleware1 layer is developed to provide necessary services used by the agents. Also, Agents use information about both application(s) task graph and application(s) mapping on different tiles so as to be able to control right tasks. Since number of tiles is continuously increasing thanks to advancements in transistor scaling technology, automatic software generation tool-chain is no longer optional. In this work, we expand a software automatic generation tool-chain and a task migration solution, all designed for tiled MPSoCs. We emphasize on how this task migration solution is integrated in this software tool-chain so that generated software is equipped with task migration capability transparently from application developers. We show how agents are placed with applications and how necessary information for such agents are generated and linked with them. The tool-chain is capable of generating code for ARM based simulation and x86 real hardware platforms. We show experimental results of task migration memory and performance overheads.