Basic HTML version of Foils prepared 17 November 98

Foil 82 Overview of the Tera MTA II

From Master Foilset for HPC Achitecture Overview CPS615 Introduction to Computational Science -- Fall Semester 1998. by Geoffrey C. Fox

Tera Architecture and System Links for Foil 82
1 The Tera Processors are multithreaded (called a stream) and each processor switches context every cycle among as many as 128 hardware threads, thereby hiding up to 128 cycles (384 ns) of memory latency.
2 Each processor executes a 21 stage pipeline and so can have 21 separate streams executing simultaneously
3 Each stream can issue as many as eight memory references without waiting for earlier ones to finish, further augmenting the memory latency tolerance of the processor.
4 A stream implements a load-store architecture with three addressing modes and 31 general-purpose 64-bit registers.
  • Switching between such streams ("threads") is fully supported by hardware
5 The peak memory bandwidth is 2.67 gigabytes per second.

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