Fix RayChannelTimeoutError

✅ Solution

RayChannelTimeoutError in vllm often arises due to insufficient Ray worker resources or network bottlenecks causing delays in inter-process communication, especially visible with pipeline parallelism (PP>1) or complex requests. To fix it, increase `object_store_memory` and `num_cpus` allocated to Ray workers during initialization to provide ample resources or, inspect the network bandwidth/latency between Ray nodes when running in multinode setting and apply network optimization techniques. Also, consider simplifying complex requests or reducing the batch size to minimize worker load.