Bernard Tourancheau

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High speed networks are now providing incredible performances. Software evolution is slow and the old protocol stacks are no longer adequate for these kind of communication speed. When band-width increases, the latency should decrease as much in order to keep the system balance. With the current network technology, the main bottleneck is most of the time(More)
Emerging many-core processors, like CUDA capable nVidia GPUs, are promising platforms for regular parallel algorithms such as the Lattice Boltzmann Method (LBM). Since global memory on graphic devices shows high latency and LBM is data intensive, memory access pattern is an important issue to achieve good performances. Whenever possible, global memory loads(More)
Block cyclic distribution seems to suit well for most linear algebra algorithms and this type of data distribution was chosen for the ScaLAPACK library as well as for the HPF language. But one has to choose a good compromise for the size of the blocks (to achieve a good computation and communication eeciency and a good load balancing). This choice heavily(More)
High speed networks are now providing incredible performances. Software evolution is slow and the old protocol stacks are no longer adequate for these kind of communication speed. When throughput increases, the latency should decrease as much in order to keep the system balance. With the current network technology, the main bottleneck is most of the time(More)
—This paper investigates the sinks mobility in IPv6-based wireless sensors networks and specially in the new IETF proposed protocol RPL (Routing Protocol for Low power and Lossy Networks). We also show that even the mobility of sinks is not an explicit design criteria, the use of mobile sinks improves the network lifetime. In this work, we propose a new(More)
Broadcast communication delay metric for the iPSC/2 and iPSC/860 hypercubes. 12 number of nodes is varied. The execution times appear to be O(p (p)) and O(log p) for L2M and M2L, respectively. Clearly, the method that toggles the most signicant bit rst is the method of choice. 4 Conclusions Our analysis shows that under reasonable assumptions, a minimum(More)
High speed networks are now providing incredible performance. Software evolution is slow and the old protocol stacks are no longer adequate for these kind of communication speeds. When bandwidth increases, the latency should decrease as much in order to keep the system balance. With the current network technology, the main bottleneck is most often the(More)