[Bugfix] Set `VLLM_ALLREDUCE_USE_SYMM_MEM` default to False (#24696)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

[Bugfix] Set `VLLM_ALLREDUCE_USE_SYMM_MEM` default to False (#24696)
Signed-off-by: yewentao256 <zhyanwentao@126.com>
1ec20355 · Wentao Ye · GitHub · e42af78b · 1ec20355
Unverified Commit 1ec20355 authored Sep 11, 2025 by Wentao Ye Committed by GitHub Sep 11, 2025
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vllm/envs.py vllm/envs.py +1 -1

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--- a/vllm/envs.py
+++ b/vllm/envs.py
@@ -1218,7 +1218,7 @@ environment_variables: dict[str, Callable[[], Any]] = {

    # Whether to use pytorch symmetric memory for allreduce
    "VLLM_ALLREDUCE_USE_SYMM_MEM":
-    lambda: bool(int(os.getenv("VLLM_ALLREDUCE_USE_SYMM_MEM", "1"))),
+    lambda: bool(int(os.getenv("VLLM_ALLREDUCE_USE_SYMM_MEM", "0"))),

    # Allows vllm to find tuned config under customized folder
    "VLLM_TUNED_CONFIG_FOLDER":