fix send-multiple items behavior with no sender supplied FLI factory

smartsim/_core/mli/comm/channel/dragon_fli.py

@@ -26,7 +26,6 @@
 
 # isort: off
 from dragon import fli
-import dragon.channels as dch
 
 # isort: on
 
@@ -59,9 +58,6 @@ def __init__(
 
         self._fli = fli_
         """The underlying dragon FLInterface used by this CommChannel for communications"""
-        self._channel: t.Optional["dch.Channel"] = None
-        """The underlying dragon Channel used by a sender-side DragonFLIChannel
-        to attach to the main FLI channel"""
         self._buffer_size: int = buffer_size
         """Maximum number of messages that can be buffered before sending"""
 
@@ -73,18 +69,36 @@ def send(self, value: bytes, timeout: float = 0.001) -> None:
         :raises SmartSimError: If sending message fails
         """
         try:
-            if self._channel is None:
-                self._channel = drg_util.create_local(self._buffer_size)
+            channel = drg_util.create_local(self._buffer_size)
 
-            with self._fli.sendh(timeout=None, stream_channel=self._channel) as sendh:
+            with self._fli.sendh(timeout=None, stream_channel=channel) as sendh:
                 sendh.send_bytes(value, timeout=timeout)
                 logger.debug(f"DragonFLIChannel {self.descriptor} sent message")
         except Exception as e:
-            self._channel = None
             raise SmartSimError(
                 f"Error sending via DragonFLIChannel {self.descriptor}"
             ) from e
 
+    def send_multiple(self, values: t.Sequence[bytes], timeout: float = 0.001) -> None:
+        """Send a message through the underlying communication channel.
+
+        :param values: The values to send
+        :param timeout: Maximum time to wait (in seconds) for messages to send
+        :raises SmartSimError: If sending message fails
+        """
+        try:
+            channel = drg_util.create_local(self._buffer_size)
+
+            with self._fli.sendh(timeout=None, stream_channel=channel) as sendh:
+                for value in values:
+                    sendh.send_bytes(value)
+                    logger.debug(f"DragonFLIChannel {self.descriptor} sent message")
+        except Exception as e:
+            self._channel = None
+            raise SmartSimError(
+                f"Error sending via DragonFLIChannel {self.descriptor} {e}"
+            ) from e
+
     def recv(self, timeout: float = 0.001) -> t.List[bytes]:
         """Receives message(s) through the underlying communication channel.
 

smartsim/_core/mli/infrastructure/control/request_dispatcher.py

@@ -371,6 +371,7 @@ def _on_iteration(self) -> None:
                     None,
                 )
 
+            logger.debug(f"Dispatcher is processing {len(bytes_list)} messages")
             request_bytes = bytes_list[0]
             tensor_bytes_list = bytes_list[1:]
             self._perf_timer.start_timings()

tests/dragon/conftest.py

@@ -50,9 +50,10 @@
 from smartsim._core.mli.infrastructure.storage.backbone_feature_store import (
     BackboneFeatureStore,
 )
-from smartsim._core.mli.infrastructure.storage.dragon_feature_store import (
-    DragonFeatureStore,
-)
+from smartsim.log import get_logger
+
+logger = get_logger(__name__)
+msg_pump_path = pathlib.Path(__file__).parent / "utils" / "msg_pump.py"
 
 class MsgPumpRequest(t.NamedTuple):
     """Fields required for starting a simulated inference request producer."""
@@ -116,17 +117,22 @@ def run_message_pump(request: MsgPumpRequest) -> subprocess.Popen:
         :param request: A request containing all parameters required to
         invoke the message pump entrypoint
         :returns: The Popen object for the subprocess that was started"""
-        # <smartsim_dir>/tests/dragon/utils/msg_pump.py
-        msg_pump_script = "tests/dragon/utils/msg_pump.py"
-        msg_pump_path = pathlib.Path(__file__).parent / msg_pump_script
+        assert request.backbone_descriptor
+        assert request.callback_descriptor
+        assert request.work_queue_descriptor
 
+        # <smartsim_dir>/tests/dragon/utils/msg_pump.py
         cmd = [sys.executable, str(msg_pump_path.absolute()), *request.as_command()]
+        logger.info(f"Executing msg_pump with command: {cmd}")
 
         popen = subprocess.Popen(
             args=cmd,
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
         )
+
+        assert popen is not None
+        assert popen.returncode is None
         return popen
 
     return run_message_pump

tests/dragon/test_request_dispatcher.py

@@ -73,7 +73,6 @@
 from smartsim.log import get_logger
 
 logger = get_logger(__name__)
-mock_msg_pump_path = pathlib.Path(__file__).parent / "utils" / "msg_pump.py"
 _MsgPumpFactory = t.Callable[[conftest.MsgPumpRequest], sp.Popen]
 
 # The tests in this file belong to the dragon group
@@ -129,8 +128,8 @@ def test_request_dispatcher(
         )
 
     request_dispatcher._on_start()
-    pump_processes: t.List[sp.Popen] = []
 
+    # put some messages into the back queue for the dispatcher to pickup
     for i in range(num_iterations):
         batch: t.Optional[RequestBatch] = None
         mem_allocs = []
@@ -149,18 +148,22 @@ def test_request_dispatcher(
         )
 
         msg_pump = msg_pump_factory(request)
-        pump_processes.append(msg_pump)
+
+        assert msg_pump is not None, "Msg Pump Process Creation Failed"
+        assert msg_pump.wait() == 0
 
         time.sleep(1)
 
-        for _ in range(200):
+        for i in range(15):
             try:
                 request_dispatcher._on_iteration()
                 batch = request_dispatcher.task_queue.get(timeout=0.1)
                 break
             except Empty:
+                logger.warning(f"Task queue is empty on iteration {i}")
                 continue
             except Exception as exc:
+                logger.error(f"Task queue exception on iteration {i}")
                 raise exc
 
         assert batch is not None
@@ -219,13 +222,6 @@ def test_request_dispatcher(
         assert model_key not in request_dispatcher._active_queues
         assert model_key not in request_dispatcher._queues
 
-        msg_pump.wait()
-
-    for msg_pump in pump_processes:
-        if msg_pump.returncode is not None:
-            continue
-        msg_pump.terminate()
-
     # Try to remove the dispatcher and free the memory
     del request_dispatcher
     gc.collect()

tests/dragon/utils/msg_pump.py

@@ -27,7 +27,7 @@
 import io
 import logging
 import pathlib
-import time
+import sys
 import typing as t
 
 import pytest
@@ -44,7 +44,6 @@
 
 # isort: on
 
-from smartsim._core.mli.comm.channel.dragon_channel import DragonCommChannel
 from smartsim._core.mli.comm.channel.dragon_fli import DragonFLIChannel
 from smartsim._core.mli.infrastructure.storage.backbone_feature_store import (
     BackboneFeatureStore,
@@ -124,6 +123,8 @@ def mock_messages(
     feature_store = BackboneFeatureStore.from_descriptor(fs_descriptor)
     request_dispatcher_queue = DragonFLIChannel.from_descriptor(dispatch_fli_descriptor)
 
+    feature_store[model_key] = load_model()
+
     for iteration_number in range(2):
         logged_iteration = offset + iteration_number
         logger.debug(f"Sending mock message {logged_iteration}")
@@ -163,9 +164,9 @@ def mock_messages(
 
         logger.info(
             f"Retrieving {iteration_number} from callback channel: {callback_descriptor}"
-        )
-        callback_channel = DragonCommChannel.from_descriptor(callback_descriptor)
 
+        # send the header & body together so they arrive together
+        request_dispatcher_queue.send_multiple([request_bytes, tensor.tobytes()])
         # Results will be empty. The test pulls messages off the queue before they
         # can be serviced by a worker. Just ensure the callback channel works.
         results = callback_channel.recv(timeout=0.1)
@@ -185,9 +186,15 @@ def mock_messages(
 
     args = args.parse_args()
 
-    mock_messages(
-        args.dispatch_fli_descriptor,
-        args.fs_descriptor,
-        args.parent_iteration,
-        args.callback_descriptor,
-    )
+    try:
+        mock_messages(
+            args.dispatch_fli_descriptor,
+            args.fs_descriptor,
+            args.parent_iteration,
+            args.callback_descriptor,
+        )
+    except Exception as ex:
+        logger.exception("The message pump did not execute properly")
+        sys.exit(100)
+
+    sys.exit(0)