[CPU][UX] Do not crash when tcmalloc/libiomp are not ldpreloaded (#37561)

Signed-off-by: Fadi Arafeh <fadi.arafeh@arm.com>

vllm/v1/worker/cpu_worker.py

@@ -57,11 +57,13 @@ class CPUWorker(Worker):
         def check_preloaded_libs(name: str):
             ld_preload_list = os.environ.get("LD_PRELOAD", "")
             if name not in ld_preload_list:
-                raise RuntimeError(
-                    f"{name} is not found in LD_PRELOAD. "
-                    "Please follow the section `set LD_PRELOAD` in "
+                logger.warning(
+                    "%s is not found in LD_PRELOAD. "
+                    "For best performance, please follow the section "
+                    "`set LD_PRELOAD` in "
                     "https://docs.vllm.ai/en/latest/getting_started/installation/cpu/ "
-                    "to setup required pre-loaded libraries."
+                    "to setup required pre-loaded libraries.",
+                    name,
                 )
 
         if sys.platform.startswith("linux"):