In this paper,we show that both software and hardware must be organized around a hierarchy of communications to perform well on todays multiprocessor machines.We classify data into three categories:the sedentary ones,the nomadic ones and the migrating ones.We show that the applications and the chips they are run on should concentrate on ommunications involving mainly sedentary and nomadic data,avoiding as much as possible to use migrations.Eventually,we present TiPi2,an on-chip multiprocessor particularly designed to this purpose.
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