From 51b3ed02ca544e58b05bcbfd261dfb5c7d355b8d Mon Sep 17 00:00:00 2001
From: Nicolas Castet <26874160+nvcastet@users.noreply.github.com>
Date: Fri, 20 Feb 2026 21:51:28 -0600
Subject: [PATCH] Fix bug in symm mem pre-allocation default (#19082)

---
 python/sglang/srt/server_args.py | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/python/sglang/srt/server_args.py b/python/sglang/srt/server_args.py
index 5860619e2..952d53563 100644
--- a/python/sglang/srt/server_args.py
+++ b/python/sglang/srt/server_args.py
@@ -1068,16 +1068,13 @@ class ServerArgs:
             if model_config.is_multimodal and not self.language_only:
                 self.adjust_mem_fraction_for_vlm(model_config)
 
-            # If symm mem is enabled and prealloc size is not set, set it to 4GB
-            if (
-                self.enable_symm_mem
-                and not envs.SGLANG_SYMM_MEM_PREALLOC_GB_SIZE.is_set()
-            ):
-                envs.SGLANG_SYMM_MEM_PREALLOC_GB_SIZE.set(4)
-                logger.warning(
-                    "Symmetric memory is enabled, setting symmetric memory prealloc size to 4GB as default."
-                    "Use environment variable SGLANG_SYMM_MEM_PREALLOC_GB_SIZE to change the prealloc size."
-                )
+        # If symm mem is enabled and prealloc size is not set, set it to 4GB
+        if self.enable_symm_mem and not envs.SGLANG_SYMM_MEM_PREALLOC_GB_SIZE.is_set():
+            envs.SGLANG_SYMM_MEM_PREALLOC_GB_SIZE.set(4)
+            logger.warning(
+                "Symmetric memory is enabled, setting symmetric memory prealloc size to 4GB as default."
+                "Use environment variable SGLANG_SYMM_MEM_PREALLOC_GB_SIZE to change the prealloc size."
+            )
 
     def _generate_cuda_graph_batch_sizes(self):
         """