A-Graph: A Unified Graph Representation for At-Will Simulation across System Stacks

TL;DR

This paper introduces A-Graph, a unified system representation that enables flexible, technology-agnostic simulation across system stacks, facilitating early design space exploration for performance and cost optimization.

Contribution

The paper presents A-Graph, a novel unified graph model for system representation, and Archx, a framework that automates and simplifies design space exploration across diverse system stacks.

Findings

A-Graph generalizes across technologies, architectures, and applications with high accuracy.

Archx provides an easy-to-use interface for automated design point sweeping.

Case studies validate A-Graph's effectiveness in diverse scenarios.

Abstract

As computer systems continue to diversify across technologies, architectures, applications, and beyond, the relevant design space has become larger and more complex. Given such trends, design space exploration (DSE) at early stages is critical to ensure agile development towards optimal performance and cost. Industry-grade EDA tools directly take in RTL code and report accurate results, but do not perform DSE. Recent works have attempted to explore the design space via simulation. However, most of these works are domain-specific and constrain the space that users are allowed to explore, offering limited flexibility between technologies, architecture, and applications. Moreover, they often demand high domain expertise to ensure high accuracy. To enable simulation that is agnostic to technology, architecture, and application at any granularity, we introduce Architecture-Graph (Agraph), a graph that unifies the system representation surrounding any arbitrary application, software, architecture, and circuit. Such a unified representation distinguishes Agraph from prior works, which focus on a single stack, allowing users to freely explore the design space across system stacks. To fully unleash the potential of Agraph, we further present Archx, a framework that implements Agraph. Archx is user-friendly in two ways. First, Archx has an easy-to-use programming interface to automatically generate and sweep design points under user constraints, boosting the programmability. Second, Archx adopts scope-based metric retrieval to analyze and understand each design point at any user-preferred hierarchy, enhancing the explainability. We conduct case studies that demonstrate Agraph's generalization across technologies, architecture, and applications with high simulation accuracy. Overall, we argue that Agraph and Archx serve as a foundation to simulate both performance and cost at will.