Microarchitecture Modeling via Dependency Graphs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for designing microarchitectures are inefficient due to complex interactions and the need for time-consuming simulator-based evaluations, which do not effectively model the microarchitecture holistically, making it difficult to identify bottlenecks and implement improvements.
Innovation Solution
A microarchitecture modeling tool that uses a dependency graph to analyze and optimize microarchitectural designs by generating a graph based on execution traces and microarchitecture definitions, allowing for the evaluation of design choices and optimizations through modification of graph vertices and edges, and considering structural hazards and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If simulator-based evaluation methods are used to model microarchitecture techniques, then design exploration can be performed, but the evaluation process becomes very time consuming
Solution Approach 1:
The patent creates a simplified dependency graph model that copies the essential structure and relationships of the actual microarchitecture. This graph-based abstraction captures the critical dependencies between microarchitectural events while eliminating the complexity of full simulation, enabling rapid evaluation of design alternatives without the time-consuming nature of cycle-accurate simulators
Solution Approach 2:
The patent transforms the microarchitecture evaluation problem by changing the representation parameters from detailed cycle-accurate simulation states to graph-theoretic parameters such as longest path length, critical path dependencies, and event sequencing. This parameter transformation enables analytical computation of performance metrics instead of time-consuming simulation execution
2Ease of manufacture
If simplified modeling approaches are used, then implementation becomes easier, but the microarchitecture cannot be modeled holistically, making it difficult to determine system bottlenecks
Solution Approach 1:
The patent segments the microarchitecture into discrete events and their dependencies, representing each as a node and edge in a dependency graph. This segmentation maintains the holistic view of system interactions while enabling precise identification of critical paths and bottlenecks through graph analysis, combining implementation simplicity with analytical accuracy
Solution Approach 2:
The patent transitions from temporal simulation dimensions to graph-theoretic dimensions, analyzing microarchitecture performance through path lengths, dependency depths, and critical chain relationships. This dimensional change enables holistic system analysis while maintaining ease of implementation through standard graph algorithms
3Measurement precision
If complex interactions between design techniques are fully modeled, then accurate performance prediction is achieved, but the modeling becomes non-trivial and time consuming
Solution Approach 1:
The patent introduces a dependency graph as an intermediary representation between the complex microarchitecture and performance evaluation. This graph structure mediates the complex interactions by explicitly representing dependencies between events, allowing accurate performance prediction through graph path analysis while keeping the modeling approach tractable through well-established graph theory methods
Data Source
AI summary
Embodiments described herein are directed to a microarchitecture modeling tool configured to model and analyze a microarchitecture using a dependency graph. The dependency graph may be generated based on an execution trace of a program and a microarchitecture definition that specifies various features and/or characteristics of the microarchitecture on which the execution trace is based. The dependency graph includes vertices representing different microarchitectural events. The vertices are coupled via edges representing a particular dependency therebetween. The edges are associated with a cost for performing microarchitectural event(s) corresponding to the vertices coupled thereto. The dependency graph also takes into account various policies for structural hazards of the microarchitecture. The microarchitecture modeling tool analyzes the costs associated with each of the edges to determine a design metric of the microarchitecture. A user is enabled to modify various features of the dependency graph to analyze different design choices and/or optimizations to the microarchitecture.