NVIDIA Posts Linux Scheduler Patches to Further Boost SMT Performance on NVIDIA Vera
NVIDIA has posted Linux scheduler patches to enhance SMT performance on NVIDIA Vera with its Olympus cores.
Intelligence analysis by Qwen 2.5 (3B)
NVIDIA has released patches to improve SMT (Simultaneous Multithreading) performance on NVIDIA Vera systems, specifically targeting the Olympus cores.
NVIDIA has made changes to their Linux scheduler to make sure that the most idle core gets to use its processing power, which helps improve the performance of their NVIDIA Vera systems.
Analysis
{"#Patch-Series-Overview":"The patch series, authored by NVIDIA engineer Andrea Righi, introduces a new scheduler behavior to prefer fully idle cores for NOHZ (No-Hz) balancing. This change is aimed at improving SMT performance on NVIDIA Vera systems.","#Impact-on-SMT-Performance":"The patches have been tested on a two-node Vera system and have shown a significant improvement in SMT performance. The throughput of a single-precision GEMM benchmark increased from approximately 9.4 TFLOP/s to approximately 10.1 TFLOP/s with the patches applied.","#Technical-Details":"The patches use SD_ASYM_PACKING, a feature that allows the scheduler to select the highest-priority available sibling within an idle core. This ensures that the workload consistently settles on the preferred PE (Processing Element) of an idle core, leading to improved performance."}
Key points
- NVIDIA has released patches to improve SMT performance on NVIDIA Vera systems.
- The patches use SD_ASYM_PACKING to ensure that the most idle core gets to use its processing power.
- The patches have been tested and have shown a significant improvement in SMT performance.
The patches are expected to lead to more consistent and efficient use of resources, resulting in better performance for applications running on NVIDIA Vera systems.
There could be potential issues if the patches cause instability or if the changes do not work as expected on all systems.