fix: tp symm mem; pending PR #48843 to reenable

Author: ivanium

benchmarks/multi_node/srt-slurm-recipes/vllm/deepseek-v4/agentic/agg-gb300-tp4-agentic.yaml

@@ -72,7 +72,7 @@ backend:
     VLLM_ENGINE_READY_TIMEOUT_S: "3600"
     VLLM_RPC_TIMEOUT: "600000"
     TILELANG_CLEANUP_TEMP_FILES: "1"
-    VLLM_USE_NCCL_SYMM_MEM: "1"
+    VLLM_ALLREDUCE_USE_SYMM_MEM: "0"
     VLLM_USE_BREAKABLE_CUDAGRAPH: "0"
     TORCH_SYMMMEM: "NVSHMEM"
     NCCL_CUMEM_ENABLE: "1"

benchmarks/multi_node/srt-slurm-recipes/vllm/deepseek-v4/agentic/agg-gb300-tp8-agentic.yaml

@@ -72,7 +72,7 @@ backend:
     VLLM_ENGINE_READY_TIMEOUT_S: "3600"
     VLLM_RPC_TIMEOUT: "600000"
     TILELANG_CLEANUP_TEMP_FILES: "1"
-    VLLM_USE_NCCL_SYMM_MEM: "1"
+    VLLM_ALLREDUCE_USE_SYMM_MEM: "0"
     VLLM_USE_BREAKABLE_CUDAGRAPH: "0"
     TORCH_SYMMMEM: "NVSHMEM"
     NCCL_CUMEM_ENABLE: "1"