TY  - JOUR
AU  - Falquez, Carlos
AU  - Long, Shiting
AU  - Ho, Nam
AU  - Suarez, Estela
AU  - Pleiter, Dirk
TI  - Processor simulation as a tool for performance engineering
JO  - Frontiers in high performance computing
VL  - 3
SN  - 2813-7337
CY  - Beijing
PB  - Frontiers Media SA
M1  - FZJ-2025-05349
SP  - 1669101
PY  - 2025
AB  - The diversity of processor architectures used for High-Performance Computing (HPC) applications has increased significantly over the last few years. This trend is expected to continue for different reasons, including the emergence of various instruction set extensions. Examples are the renewed interest in vector instructions like Arm's Scalable Vector Extension (SVE) or RISC-V's RVV. For application developers, research software developers, and performance engineers, the increased diversity and complexity of architectures have led to the following challenges: Limited access to these different processor architectures and more difficult root cause analysis in case of performance issues. To address these challenges, we propose leveraging the much-improved capabilities of processor simulators such as gem5. We enhanced this simulator with a performance analysis framework. We extend available performance counters and introduce new analysis capabilities to track the temporal behaviour of running applications. An algorithm has been implemented to link these statistics to specific regions. The resulting performance profiles allow for the identification of code regions with the potential for optimization. The focus is on observables to monitor quantities that are usually not directly accessible on real hardware. Different algorithms have been implemented to identify potential performance bottlenecks. The framework is evaluated for different types of HPC applications like the molecular-dynamics application GROMACS, Ligra, which implements the breadth-first search (BFS) algorithm, and a kernel from the Lattice QCD solver DD-αAMG.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.3389/fhpcp.2025.1669101
UR  - https://juser.fz-juelich.de/record/1049545
ER  -