buzzword
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buzzword [2015/03/27 18:24] rachata |
buzzword [2015/03/30 23:15] rachata |
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| + | ===== Lecture 24 (03/30 Mon.) ===== | ||
| + | |||
| + | * Simulation | ||
| + | * Drawbacks of RTL simulations | ||
| + | * Time consuming | ||
| + | * Complex to develop | ||
| + | * Hard to perform design explorations | ||
| + | * Explore the design space quickly | ||
| + | * Match the behavior of existing systems | ||
| + | * Tradeoffs: speed, accuracy, flexibility | ||
| + | * High-level simulation vs. detailed simulation | ||
| + | * High-level simulation is faster, but lower accuracy | ||
| + | * Controllers that works on multiple types of cores | ||
| + | * Design problems: how to find a good scheduling policy on its own? | ||
| + | * Self-optimizing memory controller: using machine learning | ||
| + | * Can adapt to the applications | ||
| + | * The complexity is very high | ||
| + | * Tolerate latency can be costly | ||
| + | * Instruction window is complex | ||
| + | * Benefit also diminishes | ||
| + | * Designing the buffers can be complex | ||
| + | * A simpler way to tolerate out of order is desirable | ||
| + | * Different sources that cause the core to stall in OoO | ||
| + | * Cache miss | ||
| + | * Note that stall happens if the inst. window is full | ||
| + | * Scaling instruction window size is hard | ||
| + | * It is better (less complex) to make the windows more efficient | ||
| + | * Runahead execution | ||
| + | * Try to optain MLP w/o increasing instruction windows | ||
| + | * Runahead (i.e. execute ahead) when there is a long memory instruction | ||
| + | * Long memory instruction stall processor for a while anyways, so it's better to make use out of it | ||
| + | * Execute future instruction to generate accurate prefetches | ||
| + | * Allow future data to be in the cache | ||
| + | * How to support runahead execution? | ||
| + | * Need a way to checkpoing the state when entering runahead mode | ||
| + | * How to make executing in the wrong path useful? | ||
| + | * Need runahead cache to handle load/store in Runahead mode (since they are speculative) | ||
buzzword.txt · Last modified: 2015/04/27 18:20 by rachata
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