vLLM adds HiSparse tiered offloading to keep GLM 5.3 decoding when KV overflows GPU memory
vLLM Blog · rss · 2026-09-07
The vLLM blog details GLM 5.3 optimizations (part 1): HiSparse is integrated as a pressure-driven memory tier that composes with the Hybrid Memory Allocator and KV offloading. When a request's KV cache no longer fits in GPU memory, decoding continues via offloading, keeping concurrency high.
Key points:
- HiSparse is pressure-driven, not a static configuration
- Composes with the hybrid allocator and existing KV offloading
- Targets decode stalls from KV overflow in long-context, high-concurrency serving
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