An Efficient Implementation of the Message Passing Interface (MPI) on the Fujitsu AP1000

The message passing interface standard released in April 1994 by the MPI Forum [2], defines a set of message passing primitives for multicomputers and clustered systems. The standard provides a large collection of functions, with the aim of providing efficient implementations, source code portability and support for the development of parallel libraries. In this paper, we describe the implementation and performance of MPI on the Fujitsu AP1000. To produce an efficient implementation, the existing operating system had to be modified to better support MPI operations. These modifications are discussed, along with the hardware operations that were utilised. A selective broadcast operation was developed which provided efficient implementations of many of the collective routines regardless of group size. The performance of MPI and CellOS point-to-point and broadcast operations are compared, along with benchmarks of some of the MPI collective routines. More details of the implementation may..