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90 lines
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.. meta::
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:description: Understand the AMD RDNA architectures and hardware blocks with ROCm Compute Profiler to analyze and optimize performance on AMD Ryzen APUs.
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:keywords: ROCm Compute Profiler, RDNA, RDNA3, gfx115x, Radeon, ROCm, Ryzen
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.. _rdna-performance-model:
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********
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RDNA3
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********
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ROCm Compute Profiler makes available an extensive list of metrics to better understand achieved application performance on RDNA3.5 architecture-based AMD Ryzen™ APUs like AMD Ryzen AI Max / Ryzen AI Max+ Series (gfx115x).
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To best use the profiling data, it's important to understand the role of various hardware blocks of AMD RDNA3 architecture. Refer to the following top-level block diagram to understand the hardware blocks of RDNA3 architecture.
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.. figure:: ../../data/conceptual/RDNA3_Block_Diagram.png
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:alt: AMD RDNA3 generation series block diagram - host CPU, system and device memory, memory controller, L2/L1 caches, global data share, command processors, ultra-threaded dispatch, and processor array of WGPs with CUs, LDS, instruction and constant caches
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:align: center
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For more details on AMD RDNA3 architecture, see page 5 of `RDNA3 shader instruction set architecture <https://docs.amd.com/v/u/en-US/rdna3-shader-instruction-set-architecture-feb-2023_0#page=5>`__.
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.. Note::
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* For top-level metrics details on CDNA and RDNA architecture, see :doc:`../performance-model`.
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* For details on metrics available for CDNA-CDNA4 architecture-based Instinct GPUs, see :doc:`../cdna/cdna-performance-model`.
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* For details on packaging, SIMD width, and generational differences between RDNA3, RDNA3.5, and later APUs, refer to :doc:`GPU hardware specifications <rocm:reference/gpu-arch-specs>` and the public architecture summaries.
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ROCm Compute Profiler includes analysis panels targeting RDNA3.5 parts reporting as
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gfx115x, such as, integrated graphics on AMD Ryzen AI Max Series processors.
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Memory hierarchy in the tool
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==============================
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For gfx115x, the Memory Chart panel walks the path from instruction and scalar
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paths, GL0 (TCP), LDS, interfaces to GL1 Cache, GL2 Cache, and GCEA toward
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system memory.
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Workgroups and execution
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==============================
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RDNA3 architecture-based APUs organize compute around Workgroup Processors (WGPs) and Compute Units (CUs). On gfx115x, each WGP pairs two CUs that share resources.
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Wavefronts are typically wave32 oriented in this configuration.
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The WGP, Shader Processor Input (SPI), and Command Processor Compute (CPC) panels in gfx115x expose dispatch, occupancy, and command-processor metrics for this RDNA execution model (see the sub-sections under :doc:`shader-engine` and :doc:`command-processor`).
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Hardware blocks
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========================
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The ROCm Compute Profiler documentation follows the RDNA3 gfx115x block hierarchy below:
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Shader engine
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-------------
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Within each shader engine, gfx115x metric tables are grouped under:
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* :doc:`spi`: Schedules wavefronts onto WGPs after the command processor dispatches work. Tracks SPI utilization and wave-dispatch statistics.
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* :doc:`wgp`: CU-pair execution (occupancy, waves, instruction mix, and WGP instruction/data caches).
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* :doc:`gl0-cache`: Vector L0 immediately before GL1; TCP-named counters through the TCP-GL1 boundary.
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* :doc:`gl1-cache`: Shared L1 utilization, requests, cache performance, and the GL1-GL2 interface.
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For more details, see :doc:`shader-engine`.
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Last-level cache and memory paths
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----------------------------------
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* :doc:`gl2-cache`: Last-level GFX on-chip cache performance, requests, and bandwidth.
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* :doc:`gcea`: DRAM read/write interfaces, system arbiter (SARB), and return traffic after GL2.
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Host-side control and coarse utilization
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-----------------------------------------
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* :doc:`command-processor`: CPC/MEC panels from packet handling through dispatch toward SPI.
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* :doc:`grbm`: GPU-wide and per-shader-engine utilization from GRBM-derived counters.
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Additional reference material
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-----------------------------
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* :doc:`system-speed-of-light`: System Speed-of-Light table using the same gfx115x metric keys as the analysis panel.
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* :doc:`references`: Public references and links to complementary Instinct documentation.
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.. Note::
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ROCm Compute Profiler currently has limited support for WMMA on gfx115x.
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