Remove asyncio.run_in_executor() calls and make scheduler cancel() async

src/ert/ensemble_evaluator/_ensemble.py

@@ -6,7 +6,7 @@
 from collections.abc import Awaitable, Callable, Sequence
 from dataclasses import dataclass
 from functools import partialmethod
-from typing import Any, Protocol
+from typing import Any
 
 from _ert.events import (
     Event,
@@ -104,7 +104,7 @@ class LegacyEnsemble:
     id_: str
 
     def __post_init__(self) -> None:
-        self._scheduler: _KillAllJobs | None = None
+        self._scheduler: Scheduler | None = None
         self._config: EvaluatorServerConfig | None = None
         self.snapshot: EnsembleSnapshot = self._create_snapshot()
         self.status = self.snapshot.status
@@ -309,16 +309,12 @@ async def _evaluate_inner(  # pylint: disable=too-many-branches
     def cancellable(self) -> bool:
         return True
 
-    def cancel(self) -> None:
+    async def cancel(self) -> None:
         if self._scheduler is not None:
-            self._scheduler.kill_all_jobs()
+            await self._scheduler.kill_all_jobs()
         logger.debug("evaluator cancelled")
 
 
-class _KillAllJobs(Protocol):
-    def kill_all_jobs(self) -> None: ...
-
-
 @dataclass
 class Realization:
     iens: int

src/ert/ensemble_evaluator/evaluator.py

@@ -50,8 +50,6 @@ def __init__(self, ensemble: Ensemble, config: EvaluatorServerConfig):
         self._config: EvaluatorServerConfig = config
         self._ensemble: Ensemble = ensemble
 
-        self._loop: asyncio.AbstractEventLoop | None = None
-
         self._events: asyncio.Queue[Event] = asyncio.Queue()
         self._events_to_send: asyncio.Queue[Event] = asyncio.Queue()
         self._manifest_queue: asyncio.Queue[Any] = asyncio.Queue()
@@ -190,7 +188,7 @@ async def _failed_handler(self, events: Sequence[EnsembleFailed]) -> None:
         if len(events) == 0:
             events = [EnsembleFailed(ensemble=self.ensemble.id_)]
         await self._append_message(self.ensemble.update_snapshot(events))
-        self._signal_cancel()  # let ensemble know it should stop
+        await self._signal_cancel()  # let ensemble know it should stop
 
     @property
     def ensemble(self) -> Ensemble:
@@ -216,7 +214,7 @@ async def handle_client(self, dealer: bytes, frame: bytes) -> None:
             event = event_from_json(frame.decode("utf-8"))
             if type(event) is EEUserCancel:
                 logger.debug("Client asked to cancel.")
-                self._signal_cancel()
+                await self._signal_cancel()
             elif type(event) is EEUserDone:
                 logger.debug("Client signalled done.")
                 self.stop()
@@ -322,7 +320,7 @@ async def _server(self) -> None:
     def stop(self) -> None:
         self._server_done.set()
 
-    def _signal_cancel(self) -> None:
+    async def _signal_cancel(self) -> None:
         """
         This is just a wrapper around logic for whether to signal cancel via
         a cancellable ensemble or to use internal stop-mechanism directly
@@ -333,16 +331,14 @@ def _signal_cancel(self) -> None:
         """
         if self._ensemble.cancellable:
             logger.debug("Cancelling current ensemble")
-            assert self._loop is not None
-            self._loop.run_in_executor(None, self._ensemble.cancel)
+            await self._ensemble.cancel()
         else:
             logger.debug("Stopping current ensemble")
             self.stop()
 
     async def _start_running(self) -> None:
         if not self._config:
             raise ValueError("no config for evaluator")
-        self._loop = asyncio.get_running_loop()
         self._ee_tasks = [
             asyncio.create_task(self._server(), name="server_task"),
             asyncio.create_task(

src/ert/ensemble_evaluator/monitor.py

@@ -47,7 +47,6 @@ async def process_message(self, msg: str) -> None:
     async def signal_cancel(self) -> None:
         await self._event_queue.put(Monitor._sentinel)
         logger.debug(f"monitor-{self._id} asking server to cancel...")
-
         cancel_event = EEUserCancel(monitor=self._id)
         await self.send(event_to_json(cancel_event))
         logger.debug(f"monitor-{self._id} asked server to cancel")

src/ert/run_models/base_run_model.py

@@ -503,12 +503,9 @@ async def run_monitor(
                         EESnapshotUpdate,
                     }:
                         event = cast(EESnapshot | EESnapshotUpdate, event)
-                        await asyncio.get_running_loop().run_in_executor(
-                            None,
-                            self.send_snapshot_event,
-                            event,
-                            iteration,
-                        )
+
+                        self.send_snapshot_event(event, iteration)
+
                         if event.snapshot.get(STATUS) in {
                             ENSEMBLE_STATE_STOPPED,
                             ENSEMBLE_STATE_FAILED,

src/ert/scheduler/scheduler.py

@@ -14,7 +14,6 @@
 import orjson
 from pydantic.dataclasses import dataclass
 
-from _ert.async_utils import get_running_loop
 from _ert.events import Event, ForwardModelStepChecksum, Id, event_from_dict
 
 from .driver import Driver
@@ -82,7 +81,6 @@ def __init__(
             real.iens: Job(self, real) for real in (realizations or [])
         }
 
-        self._loop = get_running_loop()
         self._events: asyncio.Queue[Any] = asyncio.Queue()
         self._running: asyncio.Event = asyncio.Event()
 
@@ -103,12 +101,8 @@ def __init__(
 
         self.checksum: dict[str, dict[str, Any]] = {}
 
-    def kill_all_jobs(self) -> None:
-        assert self._loop
-        # Checking that the loop is running is required because everest is closing the
-        # simulation context whenever an optimization simulation batch is done
-        if self._loop.is_running():
-            asyncio.run_coroutine_threadsafe(self.cancel_all_jobs(), self._loop)
+    async def kill_all_jobs(self) -> None:
+        await self.cancel_all_jobs()
 
     async def cancel_all_jobs(self) -> None:
         await self._running.wait()

tests/ert/unit_tests/ensemble_evaluator/test_ensemble_legacy.py

@@ -89,6 +89,7 @@ async def test_run_and_cancel_legacy_ensemble(
             # and the ensemble is set to STOPPED
             monitor._receiver_timeout = 10.0
             cancel = True
+            await evaluator._ensemble._scheduler._running.wait()
             async for event in monitor.track(heartbeat_interval=0.1):
                 # Cancel the ensemble upon the arrival of the first event
                 if cancel: