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Home»ADOPTION NEWS»NVIDIA NVLink and NVSwitch Improve Large-Scale Language Model Inference
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NVIDIA NVLink and NVSwitch Improve Large-Scale Language Model Inference

By Crypto FlexsAugust 13, 20243 Mins Read
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NVIDIA NVLink and NVSwitch Improve Large-Scale Language Model Inference
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Felix Pinkston
13 Aug 2024 07:49

NVIDIA’s NVLink and NVSwitch technologies enhance large-scale language model inference, enabling faster and more efficient multi-GPU processing.





As large-scale language models (LLMs) rapidly scale, the computing power needed to handle inference requests increases. According to the NVIDIA Technology Blog, multi-GPU computing is essential to meet real-time latency requirements and serve a growing number of users.

Benefits of Multi-GPU Computing

Even if a large model fits into a single memory of a modern GPU, the speed at which tokens are generated depends on the total compute power available. Combining the capabilities of multiple cutting-edge GPUs enables real-time user experiences. Technologies such as Tensor Parallelism (TP) can be used to speed up inference requests and carefully select the number of GPUs for each model to optimize user experience and cost.

Multi-GPU Inference: Communication Intensive

Multi-GPU TP inference involves distributing the computation of each model layer across multiple GPUs. The GPUs must communicate extensively to share results to advance to the next model layer. This communication is important because the Tensor Cores are often idle, waiting for data. For example, a single query on Llama 3.1 70B can require up to 20 GB of data transfer per GPU, highlighting the need for a high-bandwidth interconnect.

NVSwitch: The Key to Fast Multi-GPU LLM Inference

Effective multi-GPU scaling requires GPUs with high interconnect bandwidth per GPU and fast connectivity. NVIDIA Hopper Architecture GPUs with fourth-generation NVLink can communicate at 900 GB/s. When combined with NVSwitch, all GPUs in a server can communicate at this speed simultaneously, ensuring non-blocking communication. Systems such as the NVIDIA HGX H100 and H200 with multiple NVSwitch chips provide significant bandwidth, improving overall performance.

Performance comparison

Without NVSwitch, GPUs have to split their bandwidth across multiple point-to-point connections, and the communication speed decreases as more GPUs are involved. For example, point-to-point architectures only provide 128 GB/s of bandwidth for two GPUs, while NVSwitch provides 900 GB/s. This difference has a significant impact on overall inference throughput and user experience. The table in the original blog shows the bandwidth and throughput advantages of NVSwitch over point-to-point connections.

Future Innovation

NVIDIA continues to push the boundaries of real-time inference performance with NVLink and NVSwitch technology. The upcoming NVIDIA Blackwell architecture features fifth-generation NVLink, doubling the speed to 1,800 GB/s. Additionally, new NVSwitch chips and NVLink switch trays support larger NVLink domains, further improving performance on trillion-parameter models.

The NVIDIA GB200 NVL72 system, which combines 36 NVIDIA Grace CPUs and 72 NVIDIA Blackwell GPUs, is a good example of this advancement. It allows all 72 GPUs to operate as a single device, achieving real-time trillion-parameter inference that is 30x faster than the previous generation.

Image source: Shutterstock


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