Performance model#
Omniperf makes available an extensive list of metrics to better understand achieved application performance on AMD Instinct™ MI-series accelerators including Graphics Core Next™ (GCN) GPUs like the AMD Instinct MI50, CDNA™ accelerators like the MI100, and CDNA2 accelerators such as the MI250X, MI250, and MI210.
To best use profiling data, it’s important to understand the role of various hardware blocks of AMD Instinct accelerators. This section describes each hardware block on the accelerator as interacted with by a software developer to give a deeper understanding of the metrics reported by profiling data. Refer to Profiling by example for more practical examples and details on how to use Omniperf to optimize your code.
Note
In this chapter, MI2XX refers to any of the CDNA2 architecture-based AMD Instinct MI250X, MI250, and MI210 accelerators interchangeably in cases where the exact product at hand is not relevant.
For a comparison of AMD Instinct accelerator specifications, refer to Hardware specifications. For product details, see the MI250X, MI250, and MI210 product pages.
In this chapter, the AMD Instinct performance model used by Omniperf is divided into a handful of key hardware blocks, each detailed in the following sections: