class LocalElasticAgentZeusTest(unittest.TestCase):
"""
Sets up and tears down a local zeus server for testing
Tests should connect to localhost:self._mock_zeus_port
"""
def setUp(self):
self._mock_zeus = ZeusServerFixture()
self._mock_zeus.wait_for_ready(max_secs=10)
self._mock_zeus_port = self._mock_zeus.get_client_port()
def tearDown(self):
self._mock_zeus.kill()
self._mock_zeus_port = None
def _get_worker_spec(
self,
fn,
args=(),
max_restarts=1,
num_agents=1,
monitor_interval=0.1,
local_world_size=8,
):
run_id = str(uuid.uuid4().int)
rdzv_handler = dist.rendezvous(
f"zeus-adapter://localhost:{self._mock_zeus_port}/{run_id}"
f"?min_size={num_agents}"
f"&max_size={num_agents}")
spec = WorkerSpec(
role="test_trainer",
local_world_size=local_world_size,
fn=fn,
args=args,
rdzv_handler=rdzv_handler,
max_restarts=max_restarts,
monitor_interval=monitor_interval,
)
return spec
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_sad_function(self):
spec = self._get_worker_spec(fn=_sad_function, max_restarts=2)
try:
agent = LocalElasticAgent(spec, start_method="spawn")
with self.assertRaises(WorkerGroupFailureException) as cm:
agent.run()
finally:
spec.rdzv_handler.shutdown()
excs = cm.exception.get_worker_exceptions()
for i in range(spec.local_world_size):
self.assertTrue(isinstance(excs[i], Exception))
self.assertEqual(WorkerState.FAILED, agent.get_worker_group().state)
self.assertEqual(0, agent._remaining_restarts)
class LaunchTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
# start a standalone, single process etcd server to use for all tests
cls._etcd_server = EtcdServer()
cls._etcd_server.start()
cls._etcd_endpoint = cls._etcd_server.get_endpoint()
@classmethod
def tearDownClass(cls):
# stop the standalone etcd server
cls._etcd_server.stop()
def setUp(self):
self.test_dir = tempfile.mkdtemp()
def tearDown(self):
shutil.rmtree(self.test_dir)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_user_script_python(self):
run_id = str(uuid.uuid4().int)
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual(
{str(i) for i in range(world_size)}, set(os.listdir(self.test_dir))
)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_user_script_bash(self):
run_id = str(uuid.uuid4().int)
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
f"--no_python",
]
script_args = [path("bin/test_script.sh"), f"{self.test_dir}"]
with self.assertRaises(ValueError):
# --no_python cannot be used with --module
launch.main(args + ["--module"] + script_args)
launch.main(args + script_args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual(
{str(i) for i in range(world_size)}, set(os.listdir(self.test_dir))
)
# @unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_wrapper_fn_kill_script_process(self):
"""
tests that the wrapper_fn properly terminates
the script process (the script process is the sub_sub_process of
the agent
"""
nprocs = 2
sleep = 300
# wraps wrapper_fn to be torch.multiprocessing compatible
# which requires rank to be passed as first arugment
def wrap_wrap(rank, *args):
launch.wrapper_fn(*args)
context = start_processes(
fn=wrap_wrap,
args=(None, (path("bin/sleep_script.py"), "--sleep", f"{sleep}")),
nprocs=nprocs,
join=False,
start_method="fork",
)
# quick check to see that the wrapper_fn started running
# without this join() call we don't see an exception on typos
# and other silly mistakes (silently fails)
context.join(timeout=-1)
script_pids = []
for wrapper_fn_pid in context.pids():
script_pid = get_child_pids(wrapper_fn_pid)
# there should only be one child of wrapper_fn
self.assertEqual(1, len(script_pid))
script_pids.append(script_pid[0])
for wrapper_fn_proc in context.processes:
wrapper_fn_proc.terminate()
wrapper_fn_proc.join()
for script_pid in script_pids:
self.assertFalse(pid_exists(script_pid))
def _test_nproc_launch_configuration(self, nproc_type, expected_number):
run_id = str(uuid.uuid4().int)
nnodes = 1
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_type}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
f"--no_python",
]
script_args = [path("bin/test_script.sh"), f"{self.test_dir}"]
launch.main(args + script_args)
world_size = nnodes * expected_number
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual(
{str(i) for i in range(world_size)}, set(os.listdir(self.test_dir))
)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_nproc_launch_auto_configurations(self):
self._test_nproc_launch_configuration("auto", os.cpu_count())
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_nproc_launch_number_configurations(self):
self._test_nproc_launch_configuration("4", 4)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_nproc_launch_unknown_configurations(self):
with self.assertRaises(ValueError):
self._test_nproc_launch_configuration("unknown", 4)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
@patch("torch.cuda.is_available", return_value=True)
@patch("torch.cuda.device_count", return_value=3)
def test_nproc_gpu_launch_configurations(self, _mock1, _mock2):
self._test_nproc_launch_configuration("auto", 3)
self._test_nproc_launch_configuration("gpu", 3)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_elastic(self):
run_id = str(uuid.uuid4().int)
min_nodes = 1
max_nodes = 2
nproc_per_node = 4
# we are only launching 1 node (even though max = 2)
world_size = nproc_per_node
args = [
f"--nnodes={min_nodes}:{max_nodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual(
{str(i) for i in range(world_size)}, set(os.listdir(self.test_dir))
)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_standalone(self):
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--standalone",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual(
{str(i) for i in range(world_size)}, set(os.listdir(self.test_dir))
)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_elastic_multiple_agents(self):
run_id = str(uuid.uuid4().int)
min_nodes = 1
max_nodes = 2
nproc_per_node = 4
nnodes = 2
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={min_nodes}:{max_nodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
procs = []
for _ in range(nnodes - 1):
p = mp.Process(target=launch.main, args=[args])
procs.append(p)
p.start()
launch.main(args)
for i in range(nnodes - 1):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual(
{str(i) for i in range(world_size)}, set(os.listdir(self.test_dir))
)
def test_min_max_nodes_parse(self):
min_nodes, max_nodes = launch.parse_min_max_nnodes("1")
self.assertTrue(min_nodes, max_nodes)
self.assertTrue(1, min_nodes)
min_nodes, max_nodes = launch.parse_min_max_nnodes("2:20")
self.assertTrue(2, min_nodes)
self.assertTrue(20, max_nodes)
with self.assertRaises(RuntimeError):
launch.parse_min_max_nnodes("2:20:30")
class LocalElasticAgentTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
# start a standalone, single process etcd server to use for all tests
cls._etcd_server = EtcdServerFixture()
cls._etcd_server.start()
@classmethod
def tearDownClass(cls):
# stop the standalone etcd server
cls._etcd_server.stop()
def _get_worker_spec(self,
fn,
args=(),
max_restarts=1,
num_agents=1,
monitor_interval=0.1):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
run_id = str(uuid.uuid4().int)
rdzv_handler = dist.rendezvous(f"etcd://{host}:{port}/{run_id}"
f"?min_workers={num_agents}"
f"&max_workers={num_agents}")
spec = WorkerSpec(
role="test_trainer",
local_world_size=8,
fn=fn,
args=args,
rdzv_handler=rdzv_handler,
max_restarts=max_restarts,
monitor_interval=monitor_interval,
)
return spec
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_happy_function(self):
spec = self._get_worker_spec(fn=_happy_function)
agent = LocalElasticAgent(spec, start_method="fork")
agent.run()
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_distributed_sum(self):
spec = self._get_worker_spec(fn=_distributed_sum, args=(0, ))
agent = LocalElasticAgent(spec, start_method="fork")
agent.run()
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_sad_function(self):
spec = self._get_worker_spec(fn=_sad_function, max_restarts=2)
agent = LocalElasticAgent(spec, start_method="fork")
with self.assertRaises(WorkerGroupFailureException) as cm:
agent.run()
excs = cm.exception.get_worker_exceptions()
for i in range(spec.local_world_size):
self.assertTrue(isinstance(excs[i], Exception))
self.assertEqual(WorkerState.FAILED, agent.get_worker_group().state)
self.assertEqual(0, agent._remaining_restarts)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_bipolar_function(self):
spec = self._get_worker_spec(fn=_bipolar_function, max_restarts=2)
agent = LocalElasticAgent(spec, start_method="fork")
with self.assertRaises(Exception):
agent.run()
self.assertEqual(WorkerState.FAILED, agent.get_worker_group().state)
self.assertEqual(0, agent._remaining_restarts)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_check_env_function(self):
spec = self._get_worker_spec(fn=_check_env_function, max_restarts=2)
agent = LocalElasticAgent(spec, start_method="fork")
agent.run()
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_get_worker_return_values(self):
spec = self._get_worker_spec(fn=_return_rank_times, args=(2, ))
agent = LocalElasticAgent(spec, start_method="fork")
ret_vals = agent.run()
self.assertEqual(spec.local_world_size, len(ret_vals))
for i in range(spec.local_world_size):
self.assertEqual(i * 2, ret_vals[i])
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_double_agent_happy(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = 2
run_id = str(uuid.uuid4().int)
procs = []
for _ in range(nnodes - 1):
p = multiprocessing.Process(target=_run_agent,
args=(run_id, host, port, nnodes,
nnodes))
procs.append(p)
p.start()
# run one on the main process for debugging
_run_agent(run_id, host, port, nnodes, nnodes)
for i in range(nnodes - 1):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_double_agent_fault_tolerance(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = 2
run_id = str(uuid.uuid4().int)
procs = []
for _ in range(nnodes):
p = multiprocessing.Process(target=_run_agent,
args=(run_id, host, port, nnodes,
nnodes))
procs.append(p)
p.start()
# restart odd agents
for i in range(nnodes):
if i % 2 != 0:
procs[i].kill()
p = multiprocessing.Process(target=_run_agent,
args=(run_id, host, port, nnodes,
nnodes))
procs[i] = p
p.start()
for i in range(nnodes):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_double_agent_elastic(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
min_size = 1
max_size = 2
run_id = str(uuid.uuid4().int)
procs = []
for _ in range(max_size):
p = multiprocessing.Process(target=_run_agent,
args=(run_id, host, port, min_size,
max_size))
procs.append(p)
p.start()
# kill odd agents
for i in range(max_size):
if i % 2 != 0:
procs[i].kill()
for i in range(max_size):
if i % 2 == 0:
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
class LocalTimerExample(unittest.TestCase):
"""
Demonstrates how to use LocalTimerServer and LocalTimerClient
to enforce expiration of code-blocks.
Since torch multiprocessing's ``start_process`` method currently
does not take the multiprocessing context as parameter argument
there is no way to create the mp.Queue in the correct
context BEFORE spawning child processes. Once the ``start_process``
API is changed in torch, then re-enable ``test_torch_mp_example``
unittest. As of now this will SIGSEGV.
"""
@unittest.skipIf(is_asan_or_tsan(), "test is a/tsan incompatible")
def test_torch_mp_example(self):
# in practice set the max_interval to a larger value (e.g. 60 seconds)
mp_queue = mp.get_context("spawn").Queue()
server = timer.LocalTimerServer(mp_queue, max_interval=0.01)
server.start()
world_size = 8
# all processes should complete successfully
# since start_process does NOT take context as parameter argument yet
# this method WILL FAIL (hence the test is disabled)
torch_mp.spawn(
fn=_happy_function, args=(mp_queue,), nprocs=world_size, join=True
)
with self.assertRaises(Exception):
# torch.multiprocessing.spawn kills all sub-procs
# if one of them gets killed
torch_mp.spawn(
fn=_stuck_function, args=(mp_queue,), nprocs=world_size, join=True
)
server.stop()
@unittest.skipIf(is_asan_or_tsan(), "test is a/tsan incompatible")
def test_example_start_method_spawn(self):
self._run_example_with(start_method="spawn")
@unittest.skipIf(is_asan_or_tsan(), "test is a/tsan incompatible")
def test_example_start_method_forkserver(self):
self._run_example_with(start_method="forkserver")
@unittest.skipIf(is_tsan(), "test is tsan incompatible")
def test_example_start_method_fork(self):
self._run_example_with(start_method="fork")
def _run_example_with(self, start_method):
spawn_ctx = mp.get_context(start_method)
mp_queue = spawn_ctx.Queue()
server = timer.LocalTimerServer(mp_queue, max_interval=0.01)
server.start()
world_size = 8
processes = []
for i in range(0, world_size):
if i % 2 == 0:
p = spawn_ctx.Process(target=_stuck_function, args=(i, mp_queue))
else:
p = spawn_ctx.Process(target=_happy_function, args=(i, mp_queue))
p.start()
processes.append(p)
for i in range(0, world_size):
p = processes[i]
p.join()
if i % 2 == 0:
self.assertEqual(-signal.SIGKILL, p.exitcode)
else:
self.assertEqual(0, p.exitcode)
server.stop()
class LocalElasticAgentTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
# start a standalone, single process etcd server to use for all tests
cls._etcd_server = EtcdServer()
cls._etcd_server.start()
@classmethod
def tearDownClass(cls):
# stop the standalone etcd server
cls._etcd_server.stop()
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_happy_function(self):
spec = self._get_worker_spec(fn=_happy_function)
agent = LocalElasticAgent(spec, start_method="fork")
agent.run()
def _get_worker_spec(
self,
fn,
args=(),
max_restarts=1,
num_agents=1,
monitor_interval=0.1,
local_world_size=8,
):
run_id = str(uuid.uuid4().int)
rdzv_handler = dist.rendezvous(
f"etcd://{self._etcd_server.get_endpoint()}/{run_id}"
f"?min_workers={num_agents}"
f"&max_workers={num_agents}")
spec = WorkerSpec(
role="test_trainer",
local_world_size=local_world_size,
fn=fn,
args=args,
rdzv_handler=rdzv_handler,
max_restarts=max_restarts,
monitor_interval=monitor_interval,
)
return spec
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_distributed_sum(self):
spec = self._get_worker_spec(fn=_distributed_sum, args=(0, ))
agent = LocalElasticAgent(spec, start_method="fork")
agent.run()
class RoleConfig:
__slots__ = [
"role", "workers", "num_agents", "workers_num", "role_size"
]
def __init__(self,
role: str,
workers=None,
num_agents: int = 0,
workers_num: int = 0):
self.role = role
self.workers = workers
if workers_num != 0 and num_agents != 0:
self.workers = [workers_num] * num_agents
self.role_size = sum(self.workers)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_correct_rank_assignment_heterogeneous(self):
roles_config = [
self.RoleConfig("trainer", workers=[1, 2, 3, 4]),
self.RoleConfig("ps", workers=[5, 2]),
# split configuration to run the last one on the main process
self.RoleConfig("master", workers=[8]),
]
self.run_configuration(roles_config, 25)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_correct_rank_assignment_homogeneous(self):
num_workers = 4
roles_config = [
self.RoleConfig("trainer", num_agents=4, workers_num=num_workers),
self.RoleConfig("ps", num_agents=2, workers_num=num_workers),
# split configuration to run the last one on the main process
self.RoleConfig("master", num_agents=1, workers_num=num_workers),
]
self.run_configuration(roles_config, 28)
def run_configuration(self, roles_config, expected_world_size):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = sum(len(cfg.workers) for cfg in roles_config)
run_id = str(uuid.uuid4().int)
procs = []
manager = multiprocessing.Manager()
return_dict = manager.dict()
default_args = (run_id, host, port, nnodes, nnodes,
_check_rank_assignment, ())
for ind in range(len(roles_config) - 1):
config = roles_config[ind]
for num_workers in config.workers:
p = multiprocessing.Process(
target=_run_agent,
args=(*default_args, num_workers, config.role,
return_dict),
)
procs.append(p)
p.start()
# run one on the main process for debugging
config = roles_config[len(roles_config) - 1]
_run_agent(*default_args, config.workers[0], config.role, return_dict)
for i in range(nnodes - 1):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
role_info_dict = {
role_info.role: role_info
for role_info in roles_config
}
self.verify_rank_consistency(return_dict, role_info_dict,
expected_world_size)
def verify_rank_consistency(self, return_dict, role_info_dict,
expected_world_size):
role_ranks = {}
global_ranks = []
grouped_ranks = {}
for role, res in return_dict.values():
for (
group_rank,
rank,
world_size,
role_rank,
role_world_size,
) in res.values():
role_info_config = role_info_dict[role]
self.assertEqual(expected_world_size, world_size)
self.assertEqual(role_info_config.role_size, role_world_size)
if group_rank not in grouped_ranks:
grouped_ranks[group_rank] = []
grouped_ranks[group_rank].append((rank, role_rank))
global_ranks.append(rank)
if role not in role_ranks:
role_ranks[role] = []
role_ranks[role].append(role_rank)
global_ranks = sorted(global_ranks)
self.assertEqual(list(range(0, expected_world_size)), global_ranks)
for role, role_config_info in role_info_dict.items():
self.assertEqual(list(range(0, role_config_info.role_size)),
sorted(role_ranks[role]))
# Make sure that each agent assignes consecutive ranks to workes
# The first argument is the global_rank and the second argument
# is role_rank
for ranks_lst in grouped_ranks.values():
self.verify_ranks_sequential(ranks_lst, 0)
self.verify_ranks_sequential(ranks_lst, 1)
def verify_ranks_sequential(self, ranks_pairs, rank_idx):
ranks = sorted(rank_pair[rank_idx] for rank_pair in ranks_pairs)
start_rank, end_rank = ranks[0], ranks[-1]
self.assertEqual(list(range(start_rank, end_rank + 1)), ranks)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_distributed_sum_heterogenous(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = 4
run_id = str(uuid.uuid4().int)
procs = []
default_args = (run_id, host, port, nnodes, nnodes, _distributed_sum,
(0, ))
for ind in range(nnodes - 1):
p = multiprocessing.Process(target=_run_agent,
args=(*default_args, ind + 1))
procs.append(p)
p.start()
# run one on the main process for debugging
_run_agent(*default_args, 8)
for i in range(nnodes - 1):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_sad_function(self):
spec = self._get_worker_spec(fn=_sad_function, max_restarts=2)
agent = LocalElasticAgent(spec, start_method="fork")
with self.assertRaises(WorkerGroupFailureException) as cm:
agent.run()
excs = cm.exception.get_worker_exceptions()
for i in range(spec.local_world_size):
self.assertTrue(isinstance(excs[i], Exception))
self.assertEqual(WorkerState.FAILED, agent.get_worker_group().state)
self.assertEqual(0, agent._remaining_restarts)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_bipolar_function(self):
spec = self._get_worker_spec(fn=_bipolar_function, max_restarts=2)
agent = LocalElasticAgent(spec, start_method="fork")
with self.assertRaises(Exception):
agent.run()
self.assertEqual(WorkerState.FAILED, agent.get_worker_group().state)
self.assertEqual(0, agent._remaining_restarts)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_check_env_function(self):
spec = self._get_worker_spec(fn=_check_env_function, max_restarts=2)
agent = LocalElasticAgent(spec, start_method="fork")
agent.run()
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_run_check_run_id(self):
def return_run_id():
return os.environ["TORCHELASTIC_RUN_ID"]
spec = self._get_worker_spec(fn=return_run_id, max_restarts=0)
agent = LocalElasticAgent(spec, start_method="fork")
ret = agent.run()
for i in range(spec.local_world_size):
self.assertEqual(spec.rdzv_handler.get_run_id(), ret[i])
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_get_worker_return_values(self):
spec = self._get_worker_spec(fn=_return_rank_times, args=(2, ))
agent = LocalElasticAgent(spec, start_method="fork")
ret_vals = agent.run()
self.assertEqual(spec.local_world_size, len(ret_vals))
for i in range(spec.local_world_size):
self.assertEqual(i * 2, ret_vals[i])
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_double_agent_happy(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = 2
run_id = str(uuid.uuid4().int)
procs = []
for _ in range(nnodes - 1):
p = multiprocessing.Process(
target=_run_agent,
args=(run_id, host, port, nnodes, nnodes, _distributed_sum,
(0, )),
)
procs.append(p)
p.start()
# run one on the main process for debugging
_run_agent(run_id, host, port, nnodes, nnodes, _distributed_sum, (0, ))
for i in range(nnodes - 1):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_double_agent_fault_tolerance(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = 2
run_id = str(uuid.uuid4().int)
procs = []
for _ in range(nnodes):
p = multiprocessing.Process(
target=_run_agent,
args=(run_id, host, port, nnodes, nnodes, _distributed_sum,
(0, )),
)
procs.append(p)
p.start()
# restart odd agents
for i in range(nnodes):
if i % 2 != 0:
procs[i].kill()
p = multiprocessing.Process(
target=_run_agent,
args=(run_id, host, port, nnodes, nnodes, _distributed_sum,
(0, )),
)
procs[i] = p
p.start()
for i in range(nnodes):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_double_agent_elastic(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
min_size = 1
max_size = 2
run_id = str(uuid.uuid4().int)
procs = []
for _ in range(max_size):
p = multiprocessing.Process(
target=_run_agent,
args=(run_id, host, port, min_size, max_size, _distributed_sum,
(0, )),
)
procs.append(p)
p.start()
# kill odd agents
for i in range(max_size):
if i % 2 != 0:
procs[i].kill()
for i in range(max_size):
if i % 2 == 0:
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_torch_rpc(self):
"""
Simple torch rpc example with torchelastic.
Creates two agents (to simulate two node job),
each agent runs a single worker. worker0 calls an rpc_sync on
worker1.
"""
# TODO upstream this to torch.distributed.rpc so that users do not have
# to redundantly set rank as part of name (e.g. worker0) AND also pass
# it explicitly as an argument to rpc.init_rpc
def init_rpc(name_prefix, backend):
rank = int(os.environ["RANK"])
world_size = int(os.environ["WORLD_SIZE"])
rpc.init_rpc(
name=f"{name_prefix}{rank}",
backend=backend,
rank=rank,
world_size=world_size,
)
def worker_0(queue, msg):
init_rpc("worker", BackendType.PROCESS_GROUP)
ret = rpc.rpc_sync(to="worker1", func=echo, args=(msg, ))
queue.put(ret)
rpc.shutdown()
def worker_1():
init_rpc("worker", BackendType.PROCESS_GROUP)
rpc.shutdown()
def run_agent(run_id,
etcd_host,
etcd_port,
start_method,
worker_fn,
worker_args=()):
rdzv_handler = dist.rendezvous(
f"etcd://{etcd_host}:{etcd_port}/{run_id}"
f"?min_workers=2"
f"&max_workers=2")
spec = WorkerSpec(
role="test_trainer",
local_world_size=1,
fn=worker_fn,
args=worker_args,
rdzv_handler=rdzv_handler,
max_restarts=3,
monitor_interval=1,
)
agent = LocalElasticAgent(spec, start_method)
agent.run()
run_id = str(uuid.uuid4().int)
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
start_method = "fork"
msg = "hello world"
mp_queue = multiprocessing.get_context(start_method).Queue()
agent0 = multiprocessing.Process(
target=run_agent,
args=(run_id, host, port, start_method, worker_0, (mp_queue, msg)),
)
agent1 = multiprocessing.Process(target=run_agent,
args=(run_id, host, port,
start_method, worker_1, ()))
agent0.start()
agent1.start()
agent0.join()
agent1.join()
self.assertEqual(msg, mp_queue.get())
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_workers_drift_success(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = 2
run_id = str(uuid.uuid4().int)
procs = []
default_args = (run_id, host, port, nnodes, nnodes, _simulate_work)
for _ in range(nnodes - 1):
p = multiprocessing.Process(
target=_run_agent,
args=(*default_args, (10, ), 2, "test_trainer", {}, 30),
)
procs.append(p)
p.start()
_run_agent(*default_args, (1, ), 2, "test_trainer", {}, 30)
for i in range(nnodes - 1):
p = procs[i]
p.join()
self.assertEqual(0, p.exitcode)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_workers_drift_fail(self):
host = self._etcd_server.get_host()
port = self._etcd_server.get_port()
nnodes = 2
run_id = str(uuid.uuid4().int)
procs = []
default_args = (run_id, host, port, nnodes, nnodes, _simulate_work)
for _ in range(nnodes - 1):
p = multiprocessing.Process(
target=_run_agent,
args=(*default_args, (60, ), 2, "test_trainer", {}, 10),
)
procs.append(p)
p.start()
# TODO(aivanou): standardize error between different rendezvous stores
with self.assertRaises(LookupError):
_run_agent(*default_args, (1, ), 2, "test_trainer", {}, 10)
class LaunchTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
# start a standalone, single process etcd server to use for all tests
cls._etcd_server = EtcdServer()
cls._etcd_server.start()
cls._etcd_endpoint = cls._etcd_server.get_endpoint()
@classmethod
def tearDownClass(cls):
# stop the standalone etcd server
cls._etcd_server.stop()
def setUp(self):
self.test_dir = tempfile.mkdtemp()
def tearDown(self):
shutil.rmtree(self.test_dir)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_user_script_python(self):
run_id = str(uuid.uuid4().int)
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_user_script_bash(self):
run_id = str(uuid.uuid4().int)
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
f"--no_python",
]
script_args = [path("bin/test_script.sh"), f"{self.test_dir}"]
with self.assertRaises(ValueError):
# --no_python cannot be used with --module
launch.main(args + ["--module"] + script_args)
launch.main(args + script_args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
def _test_nproc_launch_configuration(self, nproc_type, expected_number):
run_id = str(uuid.uuid4().int)
nnodes = 1
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_type}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
f"--no_python",
]
script_args = [path("bin/test_script.sh"), f"{self.test_dir}"]
launch.main(args + script_args)
world_size = nnodes * expected_number
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
def test_nproc_launch_auto_configurations(self):
self._test_nproc_launch_configuration("auto", os.cpu_count())
def test_nproc_launch_number_configurations(self):
self._test_nproc_launch_configuration("4", 4)
def test_nproc_launch_unknown_configurations(self):
with self.assertRaises(ValueError):
self._test_nproc_launch_configuration("unknown", 4)
@patch("torch.cuda.is_available", return_value=True)
@patch("torch.cuda.device_count", return_value=3)
def test_nproc_gpu_launch_configurations(self, _mock1, _mock2):
self._test_nproc_launch_configuration("auto", 3)
self._test_nproc_launch_configuration("gpu", 3)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_elastic(self):
run_id = str(uuid.uuid4().int)
min_nodes = 1
max_nodes = 2
nproc_per_node = 4
# we are only launching 1 node (even though max = 2)
world_size = nproc_per_node
args = [
f"--nnodes={min_nodes}:{max_nodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_with_etcd(self):
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--with_etcd",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
class TestRpc(unittest.TestCase):
def test_init_app(self):
app.init_app(role="trainer",
backend=BackendType.PROCESS_GROUP,
backend_options=None)
@patch("torch.distributed.autograd._init")
@patch("torch.distributed.rpc.api._init_rpc_backend")
def test_init_rpc(self, rpc_backend_mock, autograd_mock):
os.environ["RANK"] = "0"
os.environ["WORLD_SIZE"] = "1"
store = TestStore()
app.init_rpc(
name="trainer_worker",
backend=BackendType.PROCESS_GROUP,
backend_options=None,
store=store,
)
autograd_mock.assert_called_once()
rpc_backend_mock.assert_called_once()
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_custom_init_rpc(self):
def init_rpc(rank, world_size, port, name):
os.environ["RANK"] = str(rank)
os.environ["WORLD_SIZE"] = str(world_size)
os.environ["MASTER_ADDR"] = "localhost"
os.environ["MASTER_PORT"] = str(port)
rendezvous_iterator = dist.rendezvous("env://",
rank=rank,
world_size=world_size)
store, _, _ = next(rendezvous_iterator)
app.init_rpc(
name=name,
backend=BackendType.PROCESS_GROUP,
backend_options=None,
store=store,
)
def master(msg, port):
init_rpc(rank=0, world_size=2, port=port, name="master")
ret = rpc.rpc_sync(to="worker", func=echo, args=(msg, ))
rpc.shutdown()
return ret
def worker(port):
init_rpc(rank=1, world_size=2, port=port, name="worker")
rpc.shutdown()
sock = find_free_port()
port = sock.getsockname()[1]
sock.close()
worker_proc = multiprocessing.Process(target=worker, args=(port, ))
worker_proc.start()
expected_msg = "test_message_on_worker"
actual_msg = master(expected_msg, port)
worker_proc.join()
self.assertEqual(expected_msg, actual_msg)
def test_get_worker_names(self):
pass
def test_get_role_info(self):
pass
def test_get_all_roles(self):
pass
def test_wait_all(self):
pass
def test_rpc_sync_on_role(self):
pass
def test_rpc_async_on_role(self):
pass
def test_rpc_remote_on_role(self):
pass
def test_init_process_group(self):
pass
class LaunchTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
# start a standalone, single process etcd server to use for all tests
cls._etcd_server = EtcdServerFixture()
cls._etcd_server.start()
host = cls._etcd_server.get_host()
port = cls._etcd_server.get_port()
cls._etcd_endpoint = f"{host}:{port}"
@classmethod
def tearDownClass(cls):
# stop the standalone etcd server
cls._etcd_server.stop()
def setUp(self):
self.test_dir = tempfile.mkdtemp()
def tearDown(self):
shutil.rmtree(self.test_dir)
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_user_script_python(self):
run_id = str(uuid.uuid4().int)
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_user_script_python_use_env(self):
run_id = str(uuid.uuid4().int)
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--use_env",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script_use_env.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_user_script_bash(self):
run_id = str(uuid.uuid4().int)
nnodes = 1
nproc_per_node = 4
world_size = nnodes * nproc_per_node
args = [
f"--nnodes={nnodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
f"--no_python",
]
script_args = [path("bin/test_script.sh"), f"{self.test_dir}"]
with self.assertRaises(ValueError):
# --no_python also requires --use_env
launch.main(args + script_args)
with self.assertRaises(ValueError):
# --no_python cannot be used with --module
launch.main(args + ["--module"] + script_args)
launch.main(args + ["--use_env"] + script_args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
@unittest.skipIf(is_tsan(), "test incompatible with tsan")
def test_launch_elastic(self):
run_id = str(uuid.uuid4().int)
min_nodes = 1
max_nodes = 2
nproc_per_node = 4
# we are only launching 1 node (even though max = 2)
world_size = nproc_per_node
args = [
f"--nnodes={min_nodes}:{max_nodes}",
f"--nproc_per_node={nproc_per_node}",
f"--rdzv_backend=etcd",
f"--rdzv_endpoint={self._etcd_endpoint}",
f"--rdzv_id={run_id}",
f"--monitor_interval=1",
f"--start_method=fork",
path("bin/test_script.py"),
f"--touch_file_dir={self.test_dir}",
]
launch.main(args)
# make sure all the workers ran
# each worker touches a file with its global rank as the name
self.assertSetEqual({str(i)
for i in range(world_size)},
set(os.listdir(self.test_dir)))
class LocalTimerTest(unittest.TestCase):
def setUp(self):
self.mp_queue = mp.Queue()
self.max_interval = 0.01
self.server = timer.LocalTimerServer(self.mp_queue, self.max_interval)
self.server.start()
def tearDown(self):
self.server.stop()
def test_exception_propagation(self):
with self.assertRaises(Exception, msg="foobar"):
with timer.expires(after=1):
raise Exception("foobar")
def test_no_client(self):
# no timer client configured; exception expected
timer.configure(None)
with self.assertRaises(RuntimeError):
with timer.expires(after=1):
pass
def test_client_interaction(self):
# no timer client configured but one passed in explicitly
# no exception expected
timer_client = timer.LocalTimerClient(self.mp_queue)
timer_client.acquire = mock.MagicMock(wraps=timer_client.acquire)
timer_client.release = mock.MagicMock(wraps=timer_client.release)
with timer.expires(after=1, scope="test", client=timer_client):
pass
timer_client.acquire.assert_called_once_with("test", mock.ANY)
timer_client.release.assert_called_once_with("test")
def test_happy_path(self):
timer.configure(timer.LocalTimerClient(self.mp_queue))
with timer.expires(after=0.5):
time.sleep(0.1)
@unittest.skipIf(is_tsan(), "test is tsan incompatible")
def test_get_timer_recursive(self):
"""
If a function acquires a countdown timer with default scope,
then recursive calls to the function should re-acquire the
timer rather than creating a new one. That is only the last
recursive call's timer will take effect.
"""
self.server.start()
timer.configure(timer.LocalTimerClient(self.mp_queue))
# func should not time out
def func(n):
if n > 0:
with timer.expires(after=0.1):
func(n - 1)
time.sleep(0.05)
func(4)
# func2 should time out
def func2(n):
if n > 0:
with timer.expires(after=0.1):
func2(n - 1)
time.sleep(0.2)
p = mp.Process(target=func2, args=(2, ))
p.start()
p.join()
self.assertEqual(-signal.SIGKILL, p.exitcode)
@staticmethod
def _run(mp_queue, timeout, duration):
client = timer.LocalTimerClient(mp_queue)
timer.configure(client)
with timer.expires(after=timeout):
time.sleep(duration)
@unittest.skipIf(is_tsan(), "test is tsan incompatible")
def test_timer(self):
timeout = 0.1
duration = 1
p = mp.Process(target=self._run,
args=(self.mp_queue, timeout, duration))
p.start()
p.join()
self.assertEqual(-signal.SIGKILL, p.exitcode)
class LocalTimerServerTest(unittest.TestCase):
def setUp(self):
self.mp_queue = mp.Queue()
self.max_interval = 0.01
self.server = timer.LocalTimerServer(self.mp_queue, self.max_interval)
def tearDown(self):
self.server.stop()
@unittest.skipIf(is_tsan(), "test is tsan incompatible")
def test_watchdog_call_count(self):
"""
checks that the watchdog function ran wait/interval +- 1 times
"""
self.server._run_watchdog = mock.MagicMock(
wraps=self.server._run_watchdog)
wait = 0.1
self.server.start()
time.sleep(wait)
self.server.stop()
watchdog_call_count = self.server._run_watchdog.call_count
self.assertGreaterEqual(watchdog_call_count,
int(wait / self.max_interval) - 1)
self.assertLessEqual(watchdog_call_count,
int(wait / self.max_interval) + 1)
def test_watchdog_empty_queue(self):
"""
checks that the watchdog can run on an empty queue
"""
self.server._run_watchdog()
def _expired_timer(self, pid, scope):
expired = time.time() - 60
return TimerRequest(worker_id=pid,
scope_id=scope,
expiration_time=expired)
def _valid_timer(self, pid, scope):
valid = time.time() + 60
return TimerRequest(worker_id=pid,
scope_id=scope,
expiration_time=valid)
def _release_timer(self, pid, scope):
return TimerRequest(worker_id=pid, scope_id=scope, expiration_time=-1)
@unittest.skipIf(is_tsan(), "test is tsan incompatible")
@mock.patch("os.kill")
def test_expired_timers(self, mock_os_kill):
"""
tests that a single expired timer on a process should terminate
the process and clean up all pending timers that was owned by the process
"""
test_pid = -3
self.mp_queue.put(self._expired_timer(pid=test_pid, scope="test1"))
self.mp_queue.put(self._valid_timer(pid=test_pid, scope="test2"))
self.server._run_watchdog()
self.assertEqual(0, len(self.server._timers))
mock_os_kill.assert_called_once_with(test_pid, signal.SIGKILL)
@mock.patch("os.kill")
def test_acquire_release(self, mock_os_kill):
"""
tests that:
1. a timer can be acquired then released (should not terminate process)
2. a timer can be vacuously released (e.g. no-op)
"""
test_pid = -3
self.mp_queue.put(self._valid_timer(pid=test_pid, scope="test1"))
self.mp_queue.put(self._release_timer(pid=test_pid, scope="test1"))
self.mp_queue.put(self._release_timer(pid=test_pid, scope="test2"))
self.server._run_watchdog()
self.assertEqual(0, len(self.server._timers))
mock_os_kill.assert_not_called()
@mock.patch("os.kill")
def test_valid_timers(self, mock_os_kill):
"""
tests that valid timers are processed correctly and the process is left alone
"""
self.mp_queue.put(self._valid_timer(pid=-3, scope="test1"))
self.mp_queue.put(self._valid_timer(pid=-3, scope="test2"))
self.mp_queue.put(self._valid_timer(pid=-2, scope="test1"))
self.mp_queue.put(self._valid_timer(pid=-2, scope="test2"))
self.server._run_watchdog()
self.assertEqual(4, len(self.server._timers))
self.assertTrue((-3, "test1") in self.server._timers)
self.assertTrue((-3, "test2") in self.server._timers)
self.assertTrue((-2, "test1") in self.server._timers)
self.assertTrue((-2, "test2") in self.server._timers)
mock_os_kill.assert_not_called()
