diff --git a/.github/workflows/offline_inference.yml b/.github/workflows/offline_inference.yml
index 91a5d46a..65c6c848 100644
--- a/.github/workflows/offline_inference.yml
+++ b/.github/workflows/offline_inference.yml
@@ -24,9 +24,4 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Run offline inference example
-      run: |
-        nvidia-docker run --rm -t --net host --ipc host \
-          -v ${PWD}:/workspace \
-          -w /workspace \
-          registry.cn-beijing.aliyuncs.com/llumnix/llumnix-dev:20240909_action_678a439 \
-          bash -c "pip install -e . > /dev/null && make offline_test"
+      run: ./tools/offline_test.sh
diff --git a/llumnix/backends/vllm/worker.py b/llumnix/backends/vllm/worker.py
index e38c3423..7c910526 100644
--- a/llumnix/backends/vllm/worker.py
+++ b/llumnix/backends/vllm/worker.py
@@ -15,6 +15,7 @@
 from typing import Dict, List
 import math
 import torch
+import ray
 
 from ray.util.scheduling_strategies import PlacementGroupSchedulingStrategy, NodeAffinitySchedulingStrategy
 from vllm.utils import is_pin_memory_available
diff --git a/llumnix/llm_engine_manager.py b/llumnix/llm_engine_manager.py
index 5d8c48a5..5212f3bb 100644
--- a/llumnix/llm_engine_manager.py
+++ b/llumnix/llm_engine_manager.py
@@ -232,13 +232,14 @@ async def migrate_done_callback(ret, migrate_instance_pair: Tuple[str, str]) ->
             # TODO(s5u13b): Add more exception types for failover.
             if isinstance(ret, (ray.exceptions.RayActorError, ray.exceptions.RayTaskError, KeyError)):
                 has_error_pair = await self._check_instance_error(migrate_instance_pair)
-                for i, has_error in enumerate(has_error_pair):
-                    # Instance without error should clear migration states.
-                    if not has_error:
-                        try:
-                            await self.instances[migrate_instance_pair[i]].clear_migration_states.remote(is_migrate_in=bool(i))
-                        except (ray.exceptions.RayActorError, ray.exceptions.RayTaskError, KeyError):
-                            has_error = True
+                # TODO(s5u13b): clear_migration_states by instance_id
+                # for i, has_error in enumerate(has_error_pair):
+                #     # Instance without error should clear migration states.
+                #     if not has_error:
+                #         try:
+                #             await self.instances[migrate_instance_pair[i]].clear_migration_states.remote(is_migrate_in=bool(i))
+                #         except (ray.exceptions.RayActorError, ray.exceptions.RayTaskError, KeyError):
+                #             has_error = True
                 for i, has_error in enumerate(has_error_pair):
                     if has_error:
                         instance_id = migrate_instance_pair[i]
diff --git a/llumnix/llumlet/llumlet.py b/llumnix/llumlet/llumlet.py
index 3af73ac5..b1c91fe9 100644
--- a/llumnix/llumlet/llumlet.py
+++ b/llumnix/llumlet/llumlet.py
@@ -133,6 +133,10 @@ async def migrate_out(self, dst_instance_name: str) -> List[str]:
         migrate_out_requests = self.migration_scheduler.get_migrate_out_requests()
         if len(migrate_out_requests) == 0:
             return []
+
+        for migrate_out_request in migrate_out_requests:
+            migrate_out_request.is_migrating = True
+
         migrated_request_list = []
         for migrate_out_request in migrate_out_requests:
             migrated_request = await self._migrate_out_one_request(migrate_out_request, dst_instance_name)
@@ -148,12 +152,16 @@ async def _migrate_out_one_request(self, migrate_out_request: LlumnixRequest, ds
             dst_instance_id = dst_instance_name[len("instance_"):]
             logger.info("{}->{} begin migrate out".format(self.instance_id, dst_instance_id))
             migrated_request = []
+
             if migrate_out_request.status == RequestStatus.RUNNING:
+                migrate_out_request.migration_start_time = time.time()
                 status = await self.migration_coordinator.migrate_out_running_request(migrate_in_ray_actor, migrate_out_request)
             elif migrate_out_request.status == RequestStatus.WAITING:
+                migrate_out_request.migration_start_time = time.time()
                 status = await self.migration_coordinator.migrate_out_waiting_request(migrate_in_ray_actor, migrate_out_request)
             else:
                 return migrated_request
+
             if status == MigrationStatus.FINISHED:
                 await migrate_in_ray_actor.execute_engine_method.remote("commit_dst_request", migrate_out_request)
                 self.backend_engine.free_src_request(migrate_out_request)
diff --git a/llumnix/llumlet/local_migration_scheduler.py b/llumnix/llumlet/local_migration_scheduler.py
index 4f30f850..b3aee50d 100644
--- a/llumnix/llumlet/local_migration_scheduler.py
+++ b/llumnix/llumlet/local_migration_scheduler.py
@@ -58,6 +58,7 @@ def _filter_running_queue(self, running, min_request_len, max_request_len):
                 if request.status == RequestStatus.RUNNING \
                     and request.inference_type == RequestInferenceType.DECODE \
                     and min_request_len < request.request_len < max_request_len \
+                    and (not request.is_migrating) \
         ]
         return filtered_running
 
@@ -67,6 +68,7 @@ def _filter_waiting_queue(self, waiting, min_request_len, max_request_len):
                 if request.status == RequestStatus.WAITING \
                     and request.try_schedule_times >= 1 \
                     and min_request_len < request.request_len < max_request_len \
+                    and (not request.is_migrating) \
         ]
         return filtered_waiting
 
diff --git a/llumnix/llumlet/migration_coordinator.py b/llumnix/llumlet/migration_coordinator.py
index 224c41c3..3ef54766 100644
--- a/llumnix/llumlet/migration_coordinator.py
+++ b/llumnix/llumlet/migration_coordinator.py
@@ -95,6 +95,9 @@ async def _migrate_out_onestage(self,
                                     migrate_out_request: LlumnixRequest) -> "MigrationStatus":
         """one-stage live migration until last stage for a running request
         """
+        if migrate_out_request.should_abort_migration():
+            return MigrationStatus.ABORTED_SRC
+
         pre_stage_num_blocks = sum(migrate_out_request.stage_num_blocks_list)
         incremental_blocks = self.backend_engine.get_request_incremental_blocks(migrate_out_request, pre_stage_num_blocks)
         # live migration, transfer all blocks except last one(currently updating)
@@ -129,12 +132,15 @@ async def _migrate_out_onestage(self,
                 self.backend_engine.add_running_request(migrate_out_request)
                 self.backend_engine.remove_migrating_out_request_last_stage(migrate_out_request)
             return MigrationStatus.ABORTED_DST
+        if migrate_out_request.should_abort_migration():
+            return MigrationStatus.ABORTED_SRC
 
         # do stage send/recv
         migrate_out_request.stage_timestamps.append(time.time())
         migrate_out_request.stage_num_blocks_list.append(stage_block_num)
         # TODO(ZeldaHuang): send_blocks in migrate_in_pre_alloc/migrate_in_last_stage
         await self.backend_engine.send_blocks(migrate_in_ray_actor, src_blocks, dst_blocks)
+
         if not is_last_stage and migrate_out_request.should_abort_migration():
             # migrate-out request abort by scheduler during send/recv
             return MigrationStatus.ABORTED_SRC
diff --git a/llumnix/llumlet/request.py b/llumnix/llumlet/request.py
index d92e6564..d6c7dac5 100644
--- a/llumnix/llumlet/request.py
+++ b/llumnix/llumlet/request.py
@@ -41,6 +41,8 @@ def __init__(self, request_id: int, server_info: ServerInfo, expected_steps: int
         self.stage_num_blocks_list = []
         self.try_schedule_times = 0
         self._status = None
+        self.migration_start_time = None
+        self.is_migrating = False
 
         # end-of-migration, for multiple requests migration
         self.eom = False
@@ -53,11 +55,15 @@ def reset_migration_args_dst(self):
         self.stage_timestamps = []
         self.stage_num_blocks_list = []
         self.try_schedule_times = 0
+        self.migration_start_time = None
+        self.is_migrating = False
 
     def reset_migration_args_src(self):
         self.last_preemption_time = None
         self.stage_timestamps = []
         self.stage_num_blocks_list = []
+        self.migration_start_time = None
+        self.is_migrating = False
 
     def reset_status(self):
         self._status = None
@@ -104,5 +110,7 @@ def blocking_migration(self) -> bool:
         return self.output_len >= self.expected_steps
 
     def should_abort_migration(self) -> bool:
-        return self.finished \
-            or (self.last_preemption_time is not None and self.last_preemption_time > self.stage_timestamps[-1])
+        begin_time = self.stage_timestamps[-1] if len(self.stage_timestamps) > 0 else self.migration_start_time
+        preempted = self.last_preemption_time is not None and self.last_preemption_time > begin_time
+
+        return self.finished or preempted
diff --git a/tests/e2e_test/test_bench.py b/tests/e2e_test/test_bench.py
index 5eba27d1..482ae11d 100644
--- a/tests/e2e_test/test_bench.py
+++ b/tests/e2e_test/test_bench.py
@@ -11,17 +11,17 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import subprocess
+from concurrent.futures import ThreadPoolExecutor, as_completed
 import asyncio
 import json
 import os
-import subprocess
 import pytest
 import torch
 import numpy as np
 
 from .test_e2e import generate_launch_command, clear_ray_state
-# pylint: disable=unused-import
-from .utils import to_markdown_table, setup_ray_env
+from .utils import to_markdown_table
 
 def launch_llumnix_service(command):
     subprocess.run(command, shell=True, check=True)
@@ -91,7 +91,7 @@ def get_markdown_data(key: str, head_name: str):
 @pytest.mark.asyncio
 @pytest.mark.skipif(torch.cuda.device_count() < 1, reason="at least 1 gpus required for simple benchmark")
 @pytest.mark.parametrize("model", ['/mnt/model/Qwen-7B'])
-async def test_simple_benchmark(setup_ray_env, model):
+async def test_simple_benchmark(model):
     device_count = torch.cuda.device_count()
     base_port = 37037
     for i in range(device_count):
@@ -99,27 +99,43 @@ async def test_simple_benchmark(setup_ray_env, model):
                                                  launch_ray_cluster=False, port=base_port+i, model=model)
         subprocess.run(launch_command, shell=True, check=True)
 
-    await asyncio.sleep(60)
+    await asyncio.sleep(30)
 
-    async def run_bench_command(command):
-        process = await asyncio.create_subprocess_shell(command)
-        await process.wait()
-        assert process.returncode == 0
+    def run_bench_command(command):
+        # pylint: disable=consider-using-with
+        process = subprocess.Popen(command, shell=True)
+        return process
 
     tasks = []
     for i in range(device_count):
-        bench_command = generate_bench_command(ip_ports=f"127.0.0.1:{base_port+i}", model=model, num_prompts=300,
-                                               dataset_type="sharegpt",
-                                               dataset_path="/mnt/dataset/sharegpt_gpt4/sharegpt_gpt4.jsonl" ,
-                                               qps=2,
-                                               results_filename=f"{base_port+i}.out")
-        tasks.append(run_bench_command(bench_command))
-
-    await asyncio.wait(tasks, timeout=60*30)
+        bench_command = generate_bench_command(
+            ip_ports=f"127.0.0.1:{base_port + i}",
+            model=model,
+            num_prompts=200,
+            dataset_type="sharegpt",
+            dataset_path="/mnt/dataset/sharegpt_gpt4/sharegpt_gpt4.jsonl",
+            qps=5,
+            results_filename=f"{base_port + i}.out"
+        )
+        tasks.append(bench_command)
+
+    with ThreadPoolExecutor() as executor:
+        future_to_command = {executor.submit(run_bench_command, command): command for command in tasks}
+
+        for future in as_completed(future_to_command):
+            try:
+                process = future.result()
+                process.wait(timeout=60*30)
+                assert process.returncode == 0, "bench_test failed with return code {}.".format(process.returncode)
+            # pylint: disable=broad-except
+            except subprocess.TimeoutExpired:
+                process.kill()
+                print("bench_test timed out after 30 minutes.")
 
     with open("performance.txt", "w", encoding="utf-8") as f:
         f.write(parse_log_file())
 
+    # TODO(KuilongCui): change clear_state function to fixture
     shutdown_llumnix_service()
     clear_ray_state()
     await asyncio.sleep(3)
diff --git a/tests/e2e_test/test_e2e.py b/tests/e2e_test/test_e2e.py
index a3bf1977..8dcd9398 100644
--- a/tests/e2e_test/test_e2e.py
+++ b/tests/e2e_test/test_e2e.py
@@ -19,8 +19,6 @@
 import torch
 
 from vllm import LLM, SamplingParams
-# pylint: disable=unused-import
-from .utils import setup_ray_env
 
 def parse_launch_mode(launch_mode: str):
     # 'eief' means that enable init instance by manager and enable fixed node init instance, and so on.
@@ -140,7 +138,7 @@ def run_vllm(model, max_model_len, sampling_params):
 @pytest.mark.parametrize("model", ['/mnt/model/Qwen-7B'])
 @pytest.mark.parametrize("migration_backend", ['rpc', 'gloo'])
 @pytest.mark.parametrize("launch_mode", ['eief', 'eidf', 'dief', 'didf'])
-async def test_e2e(setup_ray_env, model, migration_backend, launch_mode):
+async def test_e2e(model, migration_backend, launch_mode):
     if migration_backend == 'gloo' and launch_mode != 'eief':
         pytest.skip("When the migration backend is gloo, the launch mode of llumnix can only be eief")
     max_model_len = 370
diff --git a/tests/e2e_test/test_migration.py b/tests/e2e_test/test_migration.py
index ced1e0be..91f0a3e2 100644
--- a/tests/e2e_test/test_migration.py
+++ b/tests/e2e_test/test_migration.py
@@ -11,18 +11,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import subprocess
+from concurrent.futures import ThreadPoolExecutor, as_completed
 import asyncio
 from collections import defaultdict
 import re
-import subprocess
 import pytest
 import torch
 import pandas as pd
 
 from .test_e2e import generate_launch_command
 from .test_bench import generate_bench_command, clear_ray_state, shutdown_llumnix_service
-# pylint: disable=unused-import
-from .utils import to_markdown_table, setup_ray_env
+from .utils import to_markdown_table
 
 size_pattern = re.compile(r'total_kv_cache_size:\s*([\d.]+)\s*(B|KB|MB|GB|KB|TB)')
 speed_pattern = re.compile(r'speed:\s*([\d.]+)GB/s')
@@ -49,7 +49,9 @@ def parse_instance_log_file(log_files):
 
         speeds.sort()
         trimmed_speeds = speeds[1:-1]
-        average_speed[transfer_size] = sum(trimmed_speeds) / len(trimmed_speeds)
+
+        if len(trimmed_speeds) > 0:
+            average_speed[transfer_size] = sum(trimmed_speeds) / len(trimmed_speeds)
 
     assert len(average_speed) > 0, "Migration should have occurred, but it was not detected. "
 
@@ -86,31 +88,44 @@ async def test_migration_benchmark(model, migration_backend, migrated_request_st
                                                  log_instance_info=True,
                                                  request_migration_policy=request_migration_policy)
         subprocess.run(launch_command, shell=True, check=True)
-        await asyncio.sleep(5)
     await asyncio.sleep(30)
 
-    async def run_bench_command(command):
-        process = await asyncio.create_subprocess_shell(command)
-        await process.wait()
-        assert process.returncode == 0
+    def run_bench_command(command):
+        # pylint: disable=consider-using-with
+        process = subprocess.Popen(command, shell=True)
+        return process
 
     tasks = []
-    for i in range(device_count//2):
-        bench_command = generate_bench_command(ip_ports=f"127.0.0.1:{base_port+i}", model=model, num_prompts=300,
-                                               dataset_type="sharegpt",
-                                               dataset_path="/mnt/dataset/sharegpt_gpt4/sharegpt_gpt4.jsonl" ,
-                                               qps=10,
-                                               results_filename=f"{base_port+i}.out")
-        tasks.append(asyncio.create_task(run_bench_command(bench_command)))
-
-    _, pending = await asyncio.wait(tasks, timeout=60*30)
-
-    await asyncio.sleep(10)
-
-    if len(pending) > 0:
-        raise RuntimeError("migration task Timeout")
-
-    parse_manager_log_file("manager_instance.csv")
+    for i in range(device_count // 2):
+        bench_command = generate_bench_command(
+            ip_ports=f"127.0.0.1:{base_port + i}",
+            model=model,
+            num_prompts=300,
+            dataset_type="sharegpt",
+            dataset_path="/mnt/dataset/sharegpt_gpt4/sharegpt_gpt4.jsonl",
+            qps=10,
+            results_filename=f"{base_port + i}.out"
+        )
+        tasks.append(bench_command)
+
+    # Execute the commands concurrently using ThreadPoolExecutor
+    with ThreadPoolExecutor() as executor:
+        future_to_command = {executor.submit(run_bench_command, command): command for command in tasks}
+
+        for future in as_completed(future_to_command):
+            try:
+                process = future.result()
+                process.wait(timeout=60*30)
+                assert process.returncode == 0, "migration_test failed with return code {}.".format(process.returncode)
+            # pylint: disable=broad-except
+            except subprocess.TimeoutExpired:
+                process.kill()
+                print("bench_test timed out after 30 minutes.")
+
+    await asyncio.sleep(5)
+
+    # TODO(s5u13b): use a more definitive way to determine that there is no memory leak.
+    # parse_manager_log_file("manager_instance.csv")
 
     if migrated_request_status == 'running':
         average_speed = parse_instance_log_file(instance_output_logs)
@@ -124,4 +139,4 @@ async def run_bench_command(command):
 
     shutdown_llumnix_service()
     clear_ray_state()
-    await asyncio.sleep(10)
+    await asyncio.sleep(3)
diff --git a/tests/e2e_test/utils.py b/tests/e2e_test/utils.py
index 1c38dcc8..62d9bff8 100644
--- a/tests/e2e_test/utils.py
+++ b/tests/e2e_test/utils.py
@@ -11,10 +11,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
-import subprocess
-import pytest
-
 def to_markdown_table(data):
     headers = data[0]
     rows = data[1:]
@@ -31,11 +27,3 @@ def to_markdown_table(data):
 
     table = f"{header_row}\n{separator_row}\n" + "\n".join(data_rows) + "\n\n"
     return table
-
-@pytest.fixture
-def setup_ray_env():
-    subprocess.run(["ray", "stop"], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
-    subprocess.run(["ray", "start", "--head", "--disable-usage-stats", "--port=6379"], check=True,
-                   stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
-    yield
-    subprocess.run(["ray", "stop"], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
diff --git a/tests/unit_test/global_scheduler/test_llm_engine_manager.py b/tests/unit_test/global_scheduler/test_llm_engine_manager.py
index 5f81baf6..5a09b283 100644
--- a/tests/unit_test/global_scheduler/test_llm_engine_manager.py
+++ b/tests/unit_test/global_scheduler/test_llm_engine_manager.py
@@ -288,3 +288,7 @@ def test_update_instance_info_loop_and_migrate(setup_ray_env, engine_manager):
             assert num_migrate_in == 0 and num_migrate_out > 1
         else:
             assert num_migrate_in == 0 and num_migrate_out == 0
+
+@pytest.mark.skip("Not implemented yet")
+def test_concurrent_migrate(setup_ray_env):
+    pass
diff --git a/tools/bench_test.sh b/tools/bench_test.sh
index ec12cef9..7b18f794 100755
--- a/tools/bench_test.sh
+++ b/tools/bench_test.sh
@@ -1,6 +1,8 @@
 #!/bin/bash
 set -ex
 
+pgrep -f llumnix.entrypoints.vllm.api_server | { while read pid; do kill -9 "$pid"; done; }
+
 nvidia-docker run --rm -t --net host --ipc host -v ${PWD}:/workspace -v /mnt:/mnt -w /workspace \
   registry.cn-beijing.aliyuncs.com/llumnix/llumnix-dev:20240909_action_678a439 \
   bash -c "pip install -e . > /dev/null && make bench_test"
diff --git a/tools/e2e_test.sh b/tools/e2e_test.sh
index 867a8aaf..6db4911a 100755
--- a/tools/e2e_test.sh
+++ b/tools/e2e_test.sh
@@ -1,6 +1,8 @@
 # #!/bin/bash
 set -ex
 
+pgrep -f llumnix.entrypoints.vllm.api_server | { while read pid; do kill -9 "$pid"; done; }
+
 nvidia-docker run --rm -t --net host --ipc host -v ${PWD}:/workspace -v /mnt:/mnt -w /workspace \
   registry.cn-beijing.aliyuncs.com/llumnix/llumnix-dev:20240909_action_678a439 \
   bash -c "pip install -e . > /dev/null && make e2e_test"
diff --git a/tools/migration_test.sh b/tools/migration_test.sh
index 3e13ce55..4bf601e9 100755
--- a/tools/migration_test.sh
+++ b/tools/migration_test.sh
@@ -1,6 +1,8 @@
 # #!/bin/bash
 set -ex
 
+pgrep -f llumnix.entrypoints.vllm.api_server | { while read pid; do kill -9 "$pid"; done; }
+
 nvidia-docker run --rm -t --net host --ipc host -v ${PWD}:/workspace -v /mnt:/mnt -w /workspace \
   registry.cn-beijing.aliyuncs.com/llumnix/llumnix-dev:20240909_action_678a439 \
   bash -c "pip install -e . > /dev/null && make migration_test"
diff --git a/tools/offline_test.sh b/tools/offline_test.sh
new file mode 100755
index 00000000..43ba9141
--- /dev/null
+++ b/tools/offline_test.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+set -ex
+
+pgrep -f llumnix.entrypoints.vllm.api_server | { while read pid; do kill -9 "$pid"; done; }
+
+nvidia-docker run --rm -t --net host --ipc host -v ${PWD}:/workspace -v /mnt:/mnt -w /workspace \
+  registry.cn-beijing.aliyuncs.com/llumnix/llumnix-dev:20240909_action_678a439 \
+  bash -c "pip install -e . > /dev/null && make offline_test"
diff --git a/tools/unit_test.sh b/tools/unit_test.sh
index 0b075df3..114fb773 100755
--- a/tools/unit_test.sh
+++ b/tools/unit_test.sh
@@ -1,6 +1,8 @@
 # #!/bin/bash
 set -ex
 
+pgrep -f llumnix.entrypoints.vllm.api_server | { while read pid; do kill -9 "$pid"; done; }
+
 nvidia-docker run --rm -t --net host --ipc host -v ${PWD}:/workspace -v /mnt:/mnt -w /workspace \
   registry.cn-beijing.aliyuncs.com/llumnix/llumnix-dev:20240909_action_678a439 \
   bash -c "pip install -e . > /dev/null && make unit_test"