By Ali Hurson
Этот свежий сборник знакомит с последними достижениями в архитектуре компьютеров.
Register-Level verbal exchange in Speculative Chip Multiprocessors
Survey on process 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 cutting-edge Parallelization options: The SPEC CPU2006 as a Case examine
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Extra info for Advances in Computers, Volume 92
The VS state indicates that a register value is valid for current thread, and it is also final and safe to be forwarded to the successor threads. The LC state indicates that a valid register value is the only copy across all processor cores. The register-level communication is carried on over a dedicated shared bus. It encompasses address lines for a register address, data lines for register values, and some control lines. The control part includes BusR, BusW, Mask, and Shared signals. BusR signal denotes the bus read transaction caused by a processor read request for a register in the INV state.
RAW violation is detected by hardware, which is supported with minor changes in the executing binaries by issuing either another fork instruction or a special cancel instruction when misspeculation is detected . 5 summarizes the different misspeculation recovery support in speculative CMPs that speculate on interthread register dependencies. 2 Misprediction Each time a write is performed to some destination register in SM, its corresponding entry in Rwrite is decremented. If the value for a given register in Rwrite table entry becomes less than 0, a nonpredicted write has happened and violation occurs.
If the shared line remains inactive (low), the producer changes the state for this register from the VS to LC, indicating the only valid copy. 4. Write miss. A write, either final or nonfinal, to a register value in the INV state causes the write miss. The protocol actions for both FWs and NFWs are the same as in the previously described corresponding cases of write hit. The destination states of state transitions are also the same, while the source state is INV (instead of VU in the case of write hit).