FAULT-TOLERANT DISTRIBUTED SUBCUBE MANAGEMENT SCHEME FOR HYPERCUBE MULTICOMPUTER SYSTEMS

This paper proposes a fault tolerant distributed subcube management scheme for hypercube multicomputer systems. Gracefully degradable subcube management is supported by a data structure, called the distributed subcube table (DST), and a fault tolerant broadcast protocol, called the reliably synchronized broadcast (RSB). In an n-dimensional hypercube, DST is the collection of 2(n) local subcube tables (LSTs), DST = {LST(0), LST(1), ..., LST(2-1)(n)}, where LST(x) is a bit mapped table assigned to N-x, a fault free node whose address is x. LST(x), For All x, is n + 1 bits long, and it records the status (free/busy) of certain subcubes adjacent to N-x. The RSB diagnoses and avoids faults during interprocessor communication to prevent faulty nodes from being allocated for job execution. In addition to possessing a fault-tolerant design, our scheme can also achieve comparable or better performance than existing centralized schemes, as verified by extensive simulation.