Support Slurm Autorequeue for Array Jobs (#15040)

Signed-off-by: Max Ehrlich <max.ehr@gmail.com>
Co-authored-by: awaelchli <aedu.waelchli@gmail.com>

src/pytorch_lightning/CHANGELOG.md

@@ -9,6 +9,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Added
 
+- Added support for requeueing slurm array jobs ([#15022](https://github.com/Lightning-AI/lightning/issues/15022))
+
+
 - Added native AMP support for `ddp_fork` (and associated alias strategies) with CUDA GPUs ([#14983](https://github.com/Lightning-AI/lightning/pull/14983))
 
 

src/pytorch_lightning/trainer/connectors/signal_connector.py

@@ -78,7 +78,13 @@ class SignalConnector:
 
         if self.trainer.is_global_zero:
             # find job id
-            job_id = os.environ["SLURM_JOB_ID"]
+            array_job_id = os.getenv("SLURM_ARRAY_JOB_ID")
+            if array_job_id is not None:
+                array_task_id = os.environ["SLURM_ARRAY_TASK_ID"]
+                job_id = f"{array_job_id}_{array_task_id}"
+            else:
+                job_id = os.environ["SLURM_JOB_ID"]
+
             cmd = ["scontrol", "requeue", job_id]
 
             # requeue job

tests/tests_pytorch/trainer/connectors/test_signal_connector.py

@@ -100,6 +100,32 @@ def test_auto_requeue_custom_signal_flag(auto_requeue, requeue_signal):
     connector.teardown()
 
 
+@RunIf(skip_windows=True)
+@mock.patch("pytorch_lightning.trainer.connectors.signal_connector.call")
+@mock.patch("pytorch_lightning.trainer.Trainer.save_checkpoint", mock.MagicMock())
+@mock.patch.dict(os.environ, {"SLURM_JOB_ID": "12345"})
+def test_auto_requeue_job(call_mock):
+    call_mock.return_value = 0
+    trainer = Trainer(plugins=[SLURMEnvironment()])
+    connector = SignalConnector(trainer)
+    connector.slurm_sigusr_handler_fn(None, None)
+    call_mock.assert_called_once_with(["scontrol", "requeue", "12345"])
+    connector.teardown()
+
+
+@RunIf(skip_windows=True)
+@mock.patch("pytorch_lightning.trainer.connectors.signal_connector.call")
+@mock.patch("pytorch_lightning.trainer.Trainer.save_checkpoint", mock.MagicMock())
+@mock.patch.dict(os.environ, {"SLURM_JOB_ID": "12346", "SLURM_ARRAY_JOB_ID": "12345", "SLURM_ARRAY_TASK_ID": "2"})
+def test_auto_requeue_array_job(call_mock):
+    call_mock.return_value = 0
+    trainer = Trainer(plugins=[SLURMEnvironment()])
+    connector = SignalConnector(trainer)
+    connector.slurm_sigusr_handler_fn(None, None)
+    call_mock.assert_called_once_with(["scontrol", "requeue", "12345_2"])
+    connector.teardown()
+
+
 def _registering_signals():
     trainer = Trainer()
     trainer._signal_connector.register_signal_handlers()