[Bugfix] fix nightly multi-node EPLB tests' "DYNAMIC_EPLB=true" environment not working (#4223)

### What this PR does / why we need it?
fix nightly multi-node EPLB tests by adjusting
vllm_ascend\eplb\core\eplb_utils.py dynamic_eplb gate checking
### Does this PR introduce _any_ user-facing change?
no

- vLLM version: v0.11.0
- vLLM main:
2918c1b49c

---------

Signed-off-by: 白永斌 <baiyongbin3@h-partners.com>
Signed-off-by: 欧派果奶我还要 <47294568+845473182@users.noreply.github.com>
Co-authored-by: 白永斌 <baiyongbin3@h-partners.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

tests/ut/eplb/core/test_eplb_utils.py

@@ -128,7 +128,7 @@ class TestEPLBParamUtils:
         with pytest.raises(
                 ValueError,
                 match=
-                'Can not enable dynamic_eplb when not export DYNAMIC_EPLB="true".'
+                'Can not enable dynamic_eplb when DYNAMIC_EPLB is not set to "true" or "1".'
         ):
             EPLBParamUtils.check_dynamic_eplb(True)
 
@@ -136,7 +136,7 @@ class TestEPLBParamUtils:
         with pytest.raises(
                 ValueError,
                 match=
-                'Can not enable dynamic_eplb when not export DYNAMIC_EPLB="true".'
+                'Can not enable dynamic_eplb when DYNAMIC_EPLB is not set to "true" or "1".'
         ):
             EPLBParamUtils.check_dynamic_eplb(True)
 
@@ -144,7 +144,7 @@ class TestEPLBParamUtils:
         with pytest.raises(
                 ValueError,
                 match=
-                'Can not enable dynamic_eplb when not export DYNAMIC_EPLB="true".'
+                'Can not enable dynamic_eplb when DYNAMIC_EPLB is not set to "true" or "1".'
         ):
             EPLBParamUtils.check_dynamic_eplb(True)
 
@@ -152,6 +152,12 @@ class TestEPLBParamUtils:
         monkeypatch.setenv("DYNAMIC_EPLB", "true")
         EPLBParamUtils.check_dynamic_eplb(True)
 
+        monkeypatch.setenv("DYNAMIC_EPLB", "True")
+        EPLBParamUtils.check_dynamic_eplb(True)
+
+        monkeypatch.setenv("DYNAMIC_EPLB", "1")
+        EPLBParamUtils.check_dynamic_eplb(True)
+
     def test_check_expert_map_path_none(self):
         EPLBParamUtils.check_expert_map_path(None)
 

vllm_ascend/envs.py

@@ -172,7 +172,10 @@ env_variables: Dict[str, Callable[[], Any]] = {
     lambda: int(os.getenv("VLLM_ASCEND_ENABLE_NZ", 1)),
     # Decide whether we should enable CP parallelism.
     "VLLM_ASCEND_ENABLE_CONTEXT_PARALLEL":
-    lambda: bool(int(os.getenv("VLLM_ASCEND_ENABLE_CONTEXT_PARALLEL", '0')))
+    lambda: bool(int(os.getenv("VLLM_ASCEND_ENABLE_CONTEXT_PARALLEL", '0'))),
+    # Whether to anbale dynamic EPLB
+    "DYNAMIC_EPLB":
+    lambda: os.getenv("DYNAMIC_EPLB", "false").lower(),
 }
 
 # end-env-vars-definition

vllm_ascend/eplb/core/eplb_utils.py

@@ -22,6 +22,8 @@ import sys
 import torch
 from vllm.logger import logger
 
+import vllm_ascend.envs as envs_ascend
+
 
 def determine_default_expert_map(global_expert_num, world_size, rank_id,
                                  global_redundant_expert_num):
@@ -140,9 +142,10 @@ class EPLBParamUtils:
             return
         if not isinstance(dynamic_eplb, bool):
             raise TypeError("The dynamic_eplb is not bool.")
-        if dynamic_eplb and os.getenv("DYNAMIC_EPLB", "false") != "true":
+
+        if dynamic_eplb and envs_ascend.DYNAMIC_EPLB not in ("true", "1"):
             raise ValueError(
-                'Can not enable dynamic_eplb when not export DYNAMIC_EPLB="true".'
+                'Can not enable dynamic_eplb when DYNAMIC_EPLB is not set to "true" or "1".'
             )
 
     @staticmethod

vllm_ascend/patch/platform/__init__.py

@@ -16,11 +16,12 @@
 
 import os
 
+import vllm_ascend.envs as envs_ascend
 import vllm_ascend.patch.platform.patch_config  # noqa
 import vllm_ascend.patch.platform.patch_distributed  # noqa
 import vllm_ascend.patch.platform.patch_mamba_config  # noqa
 import vllm_ascend.patch.platform.patch_sched_yield  # noqa
 
-if os.getenv("DYNAMIC_EPLB", "false") == "true" or os.getenv(
+if envs_ascend.DYNAMIC_EPLB not in ("true", "1") or os.getenv(
         "EXPERT_MAP_RECORD", "false") == "true":
     import vllm_ascend.patch.platform.patch_multiproc_executor  # noqa