An Efficient Architecture for the Implementation of Message Passing Programming Model on Massive Multiprocessor SoC

Ferid Gharsalli (1) , Amer Baghdadi (1) , Marius Bonaciu (1) , G. Majauskas (1) , W. Cesario (1) , Ahmed Jerraya (1)

1 ELEC - Département Electronique

The BlueGene/L supercoputer , with 65,536 dual-processor compute nodes, was designed from the group up to support ef£ceint execution of mas- sively parallel message passing programs. Part of this support is an optimized implementation of MPI that leverages the hardw are features of BlueGene/L. MPI for BlueGene/L is implemented on top of a more basic message-passing infras- tructure called the message layer . This message layer can be used both to im- plement other higher -le vel libraries and directly by applications. MPI and the message layer are used in the two modes of operation of BlueGene/L: copro- cessor mode and virtual node mode. Performance measurements sho w that our message-passing services deli ver performance close to the hardw are limits of the machine. The y also sho w that dedicating one of the processors of a node to com- munication functions (coprocessor mode) greatly impro ves the message-passing bandwidth, whereas running two processes per compute node (virtual node mode) can have a positi ve impact on application performance.

Mots clés: Massive Multiprocessor; Architecture

Domaines: Electronique; Traitement du signal et de l'image [eess.SP]

Ferid Gharsalli, Amer Baghdadi, Marius Bonaciu, G. Majauskas, W. Cesario, et al.. An Efficient Architecture for the Implementation of Message Passing Programming Model on Massive Multiprocessor SoC. 15th IEEE International Workshop on Rapid System Prototyping, Jun 2004, Genève, Suisse. ⟨hal-02138091⟩