scale uvicorn servers

.github/workflows/ci-minimal-dependency-check.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
       - name: Install LitServe
         run: |

_requirements/test.txt

@@ -11,3 +11,4 @@ lightning >2.0.0
 torch >2.0.0
 transformers
 openai>=1.12.0
+numpy <2.0

src/litserve/specs/openai.py

@@ -317,8 +317,8 @@ async def options_chat_completions(self, request: Request):
         return Response(status_code=200)
 
     async def chat_completion(self, request: ChatCompletionRequest, background_tasks: BackgroundTasks):
+        response_queue_id = self.response_queue_id
         logger.debug("Received chat completion request %s", request)
-
         uids = [uuid.uuid4() for _ in range(request.n)]
         self.queues = []
         self.events = []
@@ -328,7 +328,7 @@ async def chat_completion(self, request: ChatCompletionRequest, background_tasks
             q = deque()
             event = asyncio.Event()
             self._server.response_buffer[uid] = (q, event)
-            self._server.request_queue.put((uid, time.monotonic(), request_el))
+            self._server.request_queue.put((response_queue_id, uid, time.monotonic(), request_el))
             self.queues.append(q)
             self.events.append(event)
 

tests/conftest.py

@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from contextlib import contextmanager
 import time
 import psutil
 from typing import Generator
@@ -97,9 +98,23 @@ def simple_batched_stream_api():
     return SimpleBatchedStreamAPI()
 
 
+@contextmanager
+def wrap_litserve_start(server: LitServer):
+    server.app.response_queue_id = 0
+    if server.lit_spec:
+        server.lit_spec.response_queue_id = 0
+    manager, processes = server.launch_inference_worker(num_uvicorn_servers=1)
+    yield server
+    for p in processes:
+        p.terminate()
+    manager.shutdown()
+
+
 @pytest.fixture()
 def lit_server(simple_litapi):
-    return LitServer(simple_litapi, accelerator="cpu", devices=1, timeout=10)
+    server = LitServer(simple_litapi, accelerator="cpu", devices=1, timeout=10)
+    with wrap_litserve_start(server) as s:
+        yield s
 
 
 @pytest.fixture()

tests/test_auth.py

@@ -18,6 +18,7 @@
 
 from litserve import LitAPI, LitServer
 import litserve.server
+from tests.conftest import wrap_litserve_start
 
 
 class SimpleAuthedLitAPI(LitAPI):
@@ -40,17 +41,15 @@ def authorize(self, auth: HTTPAuthorizationCredentials = Depends(HTTPBearer())):
 
 def test_authorized_custom():
     server = LitServer(SimpleAuthedLitAPI(), accelerator="cpu", devices=1, workers_per_device=1)
-
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
         input = {"input": 4.0}
         response = client.post("/predict", headers={"Authorization": "Bearer 1234"}, json=input)
         assert response.status_code == 200
 
 
 def test_not_authorized_custom():
     server = LitServer(SimpleAuthedLitAPI(), accelerator="cpu", devices=1, workers_per_device=1)
-
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
         input = {"input": 4.0}
         response = client.post("/predict", headers={"Authorization": "Bearer wrong"}, json=input)
         assert response.status_code == 401
@@ -74,7 +73,7 @@ def test_authorized_api_key():
     litserve.server.LIT_SERVER_API_KEY = "abcd"
     server = LitServer(SimpleLitAPI(), accelerator="cpu", devices=1, workers_per_device=1)
 
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
         input = {"input": 4.0}
         response = client.post("/predict", headers={"X-API-Key": "abcd"}, json=input)
         assert response.status_code == 200
@@ -86,7 +85,7 @@ def test_not_authorized_api_key():
     litserve.server.LIT_SERVER_API_KEY = "abcd"
     server = LitServer(SimpleLitAPI(), accelerator="cpu", devices=1, workers_per_device=1)
 
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
         input = {"input": 4.0}
         response = client.post("/predict", headers={"X-API-Key": "wrong"}, json=input)
         assert response.status_code == 401

tests/test_batch.py

@@ -23,7 +23,7 @@
 from httpx import AsyncClient
 
 from litserve import LitAPI, LitServer
-
+from tests.conftest import wrap_litserve_start
 import torch
 import torch.nn as nn
 
@@ -86,10 +86,11 @@ async def test_batched():
     api = SimpleLitAPI()
     server = LitServer(api, accelerator="cpu", devices=1, timeout=10, max_batch_size=2, batch_timeout=4)
 
-    async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
-        response1 = ac.post("/predict", json={"input": 4.0})
-        response2 = ac.post("/predict", json={"input": 5.0})
-        response1, response2 = await asyncio.gather(response1, response2)
+    with wrap_litserve_start(server) as server:
+        async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
+            response1 = ac.post("/predict", json={"input": 4.0})
+            response2 = ac.post("/predict", json={"input": 5.0})
+            response1, response2 = await asyncio.gather(response1, response2)
 
     assert response1.json() == {"output": 9.0}
     assert response2.json() == {"output": 11.0}
@@ -99,11 +100,11 @@ async def test_batched():
 async def test_unbatched():
     api = SimpleLitAPI2()
     server = LitServer(api, accelerator="cpu", devices=1, timeout=10, max_batch_size=1)
-
-    async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
-        response1 = ac.post("/predict", json={"input": 4.0})
-        response2 = ac.post("/predict", json={"input": 5.0})
-        response1, response2 = await asyncio.gather(response1, response2)
+    with wrap_litserve_start(server) as server:
+        async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
+            response1 = ac.post("/predict", json={"input": 4.0})
+            response2 = ac.post("/predict", json={"input": 5.0})
+            response1, response2 = await asyncio.gather(response1, response2)
 
     assert response1.json() == {"output": 9.0}
     assert response2.json() == {"output": 11.0}
@@ -127,8 +128,9 @@ def put(self, *args):
 
 def test_batched_loop():
     requests_queue = Queue()
-    requests_queue.put(("uuid-1234", time.monotonic(), {"input": 4.0}))
-    requests_queue.put(("uuid-1235", time.monotonic(), {"input": 5.0}))
+    response_queue_id = 0
+    requests_queue.put((response_queue_id, "uuid-1234", time.monotonic(), {"input": 4.0}))
+    requests_queue.put((response_queue_id, "uuid-1235", time.monotonic(), {"input": 5.0}))
 
     lit_api_mock = MagicMock()
     lit_api_mock.request_timeout = 2

tests/test_compression.py

@@ -14,7 +14,7 @@
 
 from fastapi import Request, Response
 from fastapi.testclient import TestClient
-
+from tests.conftest import wrap_litserve_start
 from litserve import LitAPI, LitServer
 
 # trivially compressible content
@@ -38,17 +38,16 @@ def encode_response(self, output) -> Response:
 def test_compression():
     server = LitServer(LargeOutputLitAPI(), accelerator="cpu", devices=1, workers_per_device=1)
 
-    # compressed
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
+        # compressed
         response = client.post("/predict", headers={"Accept-Encoding": "gzip"}, json={})
         assert response.status_code == 200
         assert response.headers["Content-Encoding"] == "gzip"
         content_length = int(response.headers["Content-Length"])
         assert 0 < content_length < 100000
         assert response.json() == test_output
 
-    # uncompressed
-    with TestClient(server.app) as client:
+        # uncompressed
         response = client.post("/predict", headers={"Accept-Encoding": ""}, json={})
         assert response.status_code == 200
         assert "Content-Encoding" not in response.headers

tests/test_examples.py

@@ -1,32 +1,35 @@
 import pytest
 from asgi_lifespan import LifespanManager
 from httpx import AsyncClient
-
+from tests.conftest import wrap_litserve_start
 import litserve as ls
 
 
 @pytest.mark.asyncio()
 async def test_simple_pytorch_api():
     api = ls.examples.SimpleTorchAPI()
     server = ls.LitServer(api, accelerator="cpu")
-    async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
-        response = await ac.post("/predict", json={"input": 4.0})
-        assert response.json() == {"output": 9.0}
+    with wrap_litserve_start(server) as server:
+        async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
+            response = await ac.post("/predict", json={"input": 4.0})
+            assert response.json() == {"output": 9.0}
 
 
 @pytest.mark.asyncio()
 async def test_simple_batched_api():
     api = ls.examples.SimpleBatchedAPI()
     server = ls.LitServer(api, max_batch_size=4, batch_timeout=0.1)
-    async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
-        response = await ac.post("/predict", json={"input": 4.0})
-        assert response.json() == {"output": 16.0}
+    with wrap_litserve_start(server) as server:
+        async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
+            response = await ac.post("/predict", json={"input": 4.0})
+            assert response.json() == {"output": 16.0}
 
 
 @pytest.mark.asyncio()
 async def test_simple_api():
     api = ls.examples.SimpleLitAPI()
     server = ls.LitServer(api)
-    async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
-        response = await ac.post("/predict", json={"input": 4.0})
-        assert response.json() == {"output": 16.0}
+    with wrap_litserve_start(server) as server:
+        async with LifespanManager(server.app) as manager, AsyncClient(app=manager.app, base_url="http://test") as ac:
+            response = await ac.post("/predict", json={"input": 4.0})
+            assert response.json() == {"output": 16.0}

tests/test_form.py

@@ -14,6 +14,7 @@
 
 from fastapi import Request, Response
 from fastapi.testclient import TestClient
+from tests.conftest import wrap_litserve_start
 
 from litserve import LitAPI, LitServer
 
@@ -39,7 +40,7 @@ def test_multipart_form_data(tmp_path):
         SimpleFileLitAPI(), accelerator="cpu", devices=1, workers_per_device=1, max_payload_size=(file_length * 2)
     )
 
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
         file_path = f"{tmp_path}/big_file.txt"
         with open(file_path, "wb") as f:
             f.write(bytearray([1] * file_length))
@@ -56,7 +57,7 @@ def test_file_too_big(tmp_path):
         SimpleFileLitAPI(), accelerator="cpu", devices=1, workers_per_device=1, max_payload_size=(file_length / 2)
     )
 
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
         file_path = f"{tmp_path}/big_file.txt"
         with open(file_path, "wb") as f:
             f.write(bytearray([1] * file_length))
@@ -86,8 +87,7 @@ def encode_response(self, output) -> Response:
 
 def test_urlencoded_form_data():
     server = LitServer(SimpleFormLitAPI(), accelerator="cpu", devices=1, workers_per_device=1)
-
-    with TestClient(server.app) as client:
+    with wrap_litserve_start(server) as server, TestClient(server.app) as client:
         file = {"input": "4.0"}
         response = client.post("/predict", data=file)
         assert response.json() == {"output": 16.0}