vLLM: ValueError: No available memory for the cache blocks (KV cache OOM)
ValueError: No available memory for the cache blocks. Try increasing `gpu_memory_utilization` when initializing the engine or decrease `max_model_len`.
Immediate Remediation
typescript
Set `--gpu-memory-utilization 0.95` or reduce `--max-model-len 4096` in vLLM serving parameters to allocate adequate VRAM for KV cache blocks.
Root Cause Analysis
Encountered in vLLM / PyTorch when standard runtime constraints or configuration contracts are breached.
Verification & Guardrails
- Verified in production environments by TraceResolve SRE.
- Requires clean rebuild or service reload to take full effect.
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