diff --git a/fastdeploy/engine/args_utils.py b/fastdeploy/engine/args_utils.py
index 4f0ee57cb..2d1532ae5 100644
--- a/fastdeploy/engine/args_utils.py
+++ b/fastdeploy/engine/args_utils.py
@@ -14,6 +14,7 @@
 # limitations under the License.
 """
 
+import argparse
 import json
 from dataclasses import asdict, dataclass
 from dataclasses import fields as dataclass_fields
@@ -190,7 +191,7 @@ class EngineArgs:
     """
     Flag to indicate whether to use warm-up before inference.
     """
-    enable_prefix_caching: bool = False
+    enable_prefix_caching: bool = True
     """
     Flag to enable prefix caching.
     """
@@ -387,6 +388,16 @@ class EngineArgs:
         """
         if not self.tokenizer:
             self.tokenizer = self.model
+        if self.splitwise_role == "decode":
+            self.enable_prefix_caching = False
+        if self.speculative_config is not None:
+            self.enable_prefix_caching = False
+        if self.enable_mm:
+            self.enable_prefix_caching = False
+        if not current_platform.is_cuda():
+            self.enable_prefix_caching = False
+        if self.dynamic_load_weight:
+            self.enable_prefix_caching = False
         if self.enable_logprob:
             if self.speculative_config is not None:
                 raise NotImplementedError("Logprob does not support speculation_config.")
@@ -725,7 +736,7 @@ class EngineArgs:
         perf_group = parser.add_argument_group("Performance Tuning")
         perf_group.add_argument(
             "--enable-prefix-caching",
-            action="store_true",
+            action=argparse.BooleanOptionalAction,
             default=EngineArgs.enable_prefix_caching,
             help="Flag to enable prefix caching.",
         )
diff --git a/fastdeploy/engine/engine.py b/fastdeploy/engine/engine.py
index 9109cc7b6..623dec456 100644
--- a/fastdeploy/engine/engine.py
+++ b/fastdeploy/engine/engine.py
@@ -369,7 +369,8 @@ class LLMEngine:
             for p in self.cache_manager_processes:
                 llm_logger.info(f"Killing cache manager process {p.pid}")
                 try:
-                    os.killpg(p.pid, signal.SIGTERM)
+                    pgid = os.getpgid(p.pid)
+                    os.killpg(pgid, signal.SIGTERM)
                 except Exception as e:
                     console_logger.error(
                         f"Error killing cache manager process {p.pid}: {e}, {str(traceback.format_exc())}"
@@ -381,7 +382,8 @@ class LLMEngine:
             self.get_profile_block_num_signal.clear()
         if hasattr(self, "worker_proc") and self.worker_proc is not None:
             try:
-                os.killpg(self.worker_proc.pid, signal.SIGTERM)
+                pgid = os.getpgid(self.worker_proc.pid)
+                os.killpg(pgid, signal.SIGTERM)
             except Exception as e:
                 console_logger.error(f"Error extracting sub services: {e}, {str(traceback.format_exc())}")
 
diff --git a/scripts/coverage_run.sh b/scripts/coverage_run.sh
index 23550ac29..da539e97a 100644
--- a/scripts/coverage_run.sh
+++ b/scripts/coverage_run.sh
@@ -32,6 +32,7 @@ for file in $TEST_FILES; do
     else
         success_pytest=$((success_pytest+1))
     fi
+    ps -ef | grep "${FD_CACHE_QUEUE_PORT}" | grep -v grep | awk '{print $2}' | xargs -r kill -9
 done
 
 ##################################
diff --git a/tests/model_loader/test_w4a8_model.py b/tests/model_loader/test_w4a8_model.py
index 3521cca3d..7b55c7aac 100644
--- a/tests/model_loader/test_w4a8_model.py
+++ b/tests/model_loader/test_w4a8_model.py
@@ -29,6 +29,7 @@ FD_ENGINE_QUEUE_PORTS = [
     [9991, 9992],
 ]
 FD_CACHE_QUEUE_PORT = int(os.getenv("FD_CACHE_QUEUE_PORT", 8333))
+FD_CACHE_QUEUE_PORTS = [FD_CACHE_QUEUE_PORT, FD_CACHE_QUEUE_PORT + 1, FD_CACHE_QUEUE_PORT + 2, FD_CACHE_QUEUE_PORT + 3]
 
 
 models = [
@@ -54,7 +55,7 @@ def llm(request):
             max_model_len=8192,
             num_gpu_blocks_override=1024,
             engine_worker_queue_port=FD_ENGINE_QUEUE_PORTS[port_index],
-            cache_queue_port=FD_CACHE_QUEUE_PORT,
+            cache_queue_port=FD_CACHE_QUEUE_PORTS[port_index],
             load_choices="default",
             enable_expert_parallel=True,
         )
diff --git a/tests/v1/test_schedule_output.py b/tests/v1/test_schedule_output.py
index ffe9432c3..d99a4ce76 100644
--- a/tests/v1/test_schedule_output.py
+++ b/tests/v1/test_schedule_output.py
@@ -30,8 +30,8 @@ def test_normal_schedule():
         max_num_seqs=max_num_seqs, config=fd_config, tensor_parallel_size=8, splitwise_role="mixed"
     )
     req1 = Request.from_dict({"request_id": "req1", "prompt_token_ids": [1] * 3199, "prompt_token_ids_len": 3199})
-    req2 = Request.from_dict({"request_id": "req2", "prompt_token_ids": [1] * 3201, "prompt_token_ids_len": 3201})
-    req3 = Request.from_dict({"request_id": "req3", "prompt_token_ids": [1] * 3200, "prompt_token_ids_len": 3200})
+    req2 = Request.from_dict({"request_id": "req2", "prompt_token_ids": [2] * 3201, "prompt_token_ids_len": 3201})
+    req3 = Request.from_dict({"request_id": "req3", "prompt_token_ids": [3] * 3200, "prompt_token_ids_len": 3200})
     resource_manager_v1.add_request(req1)
     resource_manager_v1.add_request(req2)
     resource_manager_v1.add_request(req3)
@@ -93,7 +93,7 @@ def test_preempted_request():
         max_num_seqs=max_num_seqs, config=fd_config, tensor_parallel_size=8, splitwise_role="mixed"
     )
     req1 = Request.from_dict({"request_id": "req1", "prompt_token_ids": [1] * 3200, "prompt_token_ids_len": 3200})
-    req2 = Request.from_dict({"request_id": "req2", "prompt_token_ids": [1] * 3200, "prompt_token_ids_len": 3200})
+    req2 = Request.from_dict({"request_id": "req2", "prompt_token_ids": [2] * 3200, "prompt_token_ids_len": 3200})
     resource_manager_v1.add_request(req1)
     resource_manager_v1.add_request(req2)
     # step 1