Julian Chesterfield’s scientific contributions

Les systèmes multiprocesseurs sur puce (MPSoC) sont des composants clés pour les applications complexes qui impliquent une grande pression sur la mémoire, les dispositifs de communication et les unités de calcul. Depuis vingt ans, MPSoC rassemble, lors d’un forum interdisciplinaire, des experts des systèmes matériels, des logiciels multicoeurs et des multiprocesseurs venus du monde entier. C’est pour célébrer le 20e anniversaire de MPSoC que cet ouvrage est publié, de même que le second tome sur les applications.Systèmes multiprocesseurs sur puce 2 est consacré aux applications. Il couvre la conception de MPSoC, les compilateurs et l’exploration d’architectures. Il décrit les méthodes d’optimisation et les outils permettant de porter des applications spécifiques sur les architectures MPSoC : la compilation, la consommation d’énergie et la communication sans fil sont détaillées, des exemples d’outils de modélisation et de CAO sont présentés ainsi que les plates-formes spécifiques pour l’automobile et l’informatique en temps réel.

Modern NVMe Flash devices deliver over 1 million random I/O operations per second (IOPS) at sub‐100 µs latencies, making them orders of magnitude faster than traditional hard drives with rotating disks, especially for random I/O. In this chapter, the authors explain the challenges of high‐performance cloud computing, especially with respect to storage I/O operations, and present their solution to accelerating virtualized distributed NVMe storage with hardware. They briefly discuss the concept of hyperconverged infrastructure (HCI) versus disaggregated cloud infrastructure, providing insights into the advantages of each type of setup. Then, the authors proceed with an overview of the NexVisor platform and explain how it has been designed to minimize I/O overheads and provide I/O performance that is equivalent to servers running baremetal OS.

Virtualization of server hardware is a commonly used practice to provide scalable resource management. In order to meet a variety of emerging technology trends, a novel, super-lightweight Type I Hypervisor architecture is essential. The proposed ‘Microvisor’ architecture is significant for a number of reasons. 1. Resource utilization efficiency. Microservers are servers with limited resources and high performanceto-power ratios, which are built and managed as a cluster of cache-coherent CPU islands. 2. Performance and scalability. To meet the performance and scale demands of emerging Network Function Virtualization (NFV) platforms, a significantly rearchitected paravirtual network IO path is required.