Design of an MIMD Multimicroprocessor for DSM

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Design ofan MIMD Multimicroprocessorfor DSM

• A Board Which turns PC into a DSM Node
  
  Based on the RM Approach1
• The RM approach is essentially a
  write-through update type of DSM. In theory, each
  node includes its private memory and a portion of
  the distributed shared memory. Adressing modes of
  distributed shared memory are replicated. When a
  node writes to its own part of the distributed
  shared memory, the data also go onto the
  interconnection network (typically a bus or a
  ring) and gets written into the distributed
  shared memory of all nodes that might need or
  will need that particular data. Consequently, the
  reading is always satisfied in the local part of
  the distributed shared memory, and data
  consistency is preserved.
• The type of data consistency supported
  depends on the philosophy of the system software
• (see Protic96a for a survey of possible
  approaches to data consistency in DSM systems)
  and the concrete hardware design (there is a
  transmit FIFO buffer, as well a receive FIFO
  buffer, on the interface between the node and the
  interconnection network data may be deleted
  and/or bypassed while in a FIFO). The basic
  operational structure of an RM system is shown in
  Figure Z1a.

1PC Personal Computer DSM Distributed
Shared Memory RM Reflective Memory
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Figure Z1 Basic Operational Structure Legend
DMA Direct Memory Access TMI Transition
Module Interface Comment An important
characteristic of this approach is that it can be
implemented using off-the-shelf and FPG
components only.