In gem5, the Ruby memory subsystem dominates simulation time for the AtomicSimpleCPU and TimingSimpleCPU, chiefly during instruction fetch, while the O3CPU spends most of its time building instruction objects and running pipeline stages.
Garnet: A detailed on- chip network model inside a full-system simulator
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Anatomy of the gem5 Simulator: AtomicSimpleCPU, TimingSimpleCPU, O3CPU, and Their Interaction with the Ruby Memory System
In gem5, the Ruby memory subsystem dominates simulation time for the AtomicSimpleCPU and TimingSimpleCPU, chiefly during instruction fetch, while the O3CPU spends most of its time building instruction objects and running pipeline stages.