Spike: Weight Block Paging Technology for Large Language Models

Spike is an innovative open-source project that introduces a weight block paging mechanism for large language models, aiming to solve the memory bottleneck problem of large model inference in memory-constrained environments. This technology achieves efficient inference through strategies such as on-demand loading, intelligent swapping, and prefetching optimization, and is suitable for scenarios like edge deployment and multi-model services, making it an important direction for large model inference optimization.

With the explosive growth in the parameter scale of large language models (LLMs), the memory demand for inference has increased sharply. Even a 70B parameter model requires dozens of GB of memory after quantization, posing challenges to edge devices, personal computers, and even some cloud servers. Traditional solutions like quantization, distillation, or sharded inference either lose quality or require complex distributed architectures.

The core innovation of Spike is the weight block paging mechanism, which draws on the idea of virtual memory to treat weights as blocks that can be loaded in pages. Core ideas:

• On-demand loading: Only load the weight blocks needed for current inference
• Intelligent swapping: Swap out temporarily unused blocks to disk when memory is insufficient
• Prefetching optimization: Predict next-step needs and load in advance

The implementation mechanism identifies independent weight blocks based on the Transformer architecture, and a scheduling system manages loading and execution. Key points include:

1. Appropriate block granularity to balance flexibility and IO frequency
2. Using autoregressive characteristics to predict weight demand
3. Memory pool prioritizes retaining frequently used blocks

Scenarios suitable for Spike:

• Edge device deployment: Running large models on memory-constrained environments like mobile phones and embedded devices
• Multi-model services: Loading multiple different large models simultaneously on the same server
• Cost optimization: Reducing the demand for high-end GPU memory to lower inference costs
• Fast startup: Inference can be performed without waiting for the full model to load

Spike represents the shift of large model inference from "full loading" to "on-demand loading". Its idea is in line with operating system virtual memory and database buffer pool management, and it is innovatively applied to the field of neural network inference. As model scales grow, such memory optimization technologies will become key to the popularization of large models.

As the parameter scale of large models continues to grow, the importance of memory optimization technologies is becoming increasingly prominent. The on-demand loading idea of Spike is expected to drive more innovations and help large models be widely applied in more resource-constrained scenarios.