Advances in Computers, Volume 92 by Ali Hurson

By Ali Hurson

Этот свежий сборник знакомит с последними достижениями в архитектуре компьютеров.
Register-Level communique in Speculative Chip Multiprocessors
Survey on method I/O Transactions and influence on Latency, Throughput, and different Factors
Hardware and alertness Profiling Tools
Model Transformation utilizing Multiobjective Optimization
Manual Parallelization as opposed to state of the art Parallelization recommendations: The SPEC CPU2006 as a Case learn

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Extra resources for Advances in Computers, Volume 92

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In case of misspeculation in NEKO, a recovery process first has to reset the status of communication and, then, to reinitiate the processes of updating and propagating register values. 5 Misspeculation Recovery Support CMP Misspeculation Recovery Support Multiscalar [14] Multiplex [8] Double register sets per core Recover and squash bit masks per core MAJC [17] Virtual channels NEKO [22] Hardware support (CSC and CRB per core) Pinot [23] Hardware support with modified ISA clear UPD and PRO bits in its scoreboard (CSC) to restart updating and propagating process and RC and RR bits in the scoreboard of successor PU in order to invalidate the status of register values in CRB [22].

The read request for this register is issued on the bus along with the mask code of its speculative thread. Consequently, read miss incurs a consumer-initiated interthread communication. All possible suppliers, that is, predecessors (nonspeculative thread and/or earlier speculative threads) that have a requested register in either the VS or LC state, reply with posting their mask codes on the bus and a distributed arbitrator chooses the nearest predecessor. 21 Processor-initiated state transitions (solid lines) and bus-induced state transitions (dashed lines) for loop-live registers in the SIC protocol.

Register Communication Mechanisms Most of the speculative CMPs reviewed in this chapter speculate on register values that flow between threads during execution, by using either a specific speculative register value transfer or a value prediction scheme. On the other hand, IACOMA and MP98 (Merlot) do not speculate on register values transferred between threads, but they both use synchronization mechanisms to handle the interthread communication on register level. 1 Speculative Register Value Transfer This includes the mechanisms where an interthread-dependent instruction has to wait for the register value produced by the predecessor thread.

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