Adding an extended test for new MPITaskScheduler logic

Author: yadudoc

parsl/tests/test_mpi_apps/test_mpi_scheduler.py

@@ -161,3 +161,36 @@ def test_MPISched_contention():
     assert task_on_worker_side['task_id'] == 2
     _, _, _, resource_spec = unpack_res_spec_apply_message(task_on_worker_side['buffer'])
     assert len(resource_spec['MPI_NODELIST'].split(',')) == 8
+
+
+
+@pytest.mark.local
+def test_tiny_large_loop():
+    """Run a set of tiny and large tasks in a loop"""
+
+    task_q, result_q = SpawnContext.Queue(), SpawnContext.Queue()
+    scheduler = MPITaskScheduler(task_q, result_q)
+
+    assert scheduler.available_nodes
+    assert len(scheduler.available_nodes) == 8
+
+    assert scheduler._free_node_counter.value == 8
+
+    for i in range(10):
+        num_nodes = 2 if i % 2 == 0 else 8
+        mock_task_buffer = pack_res_spec_apply_message("func", "args", "kwargs",
+                                                       resource_specification={
+                                                           "num_nodes": num_nodes,
+                                                           "ranks_per_node": 2
+                                                       })
+        task_package = {"task_id": i, "buffer": mock_task_buffer}
+        scheduler.put_task(task_package)
+
+    for i in range(10):
+        task = task_q.get(timeout=30)
+        result_pkl = pickle.dumps(
+            {"task_id": task["task_id"], "type": "result", "buffer": "RESULT BUF"})
+        result_q.put(result_pkl)
+        got_result = scheduler.get_result(True, 1)
+        assert got_result == result_pkl
+        logging.warning(f"Got {task=}")