def run(args):
if args.standalone:
etcd_server = EtcdServer()
etcd_server.start()
args.rdzv_backend = "etcd"
args.rdzv_endpoint = etcd_server.get_endpoint()
args.rdzv_id = str(uuid.uuid4())
log.info(
f"\n**************************************\n"
f"Rendezvous info:\n"
f"--rdzv_backend={args.rdzv_backend} "
f"--rdzv_endpoint={args.rdzv_endpoint} "
f"--rdzv_id={args.rdzv_id}\n"
f"**************************************\n"
)
config, cmd = config_from_args(args)
try:
elastic_launch(
config=config,
entrypoint=cmd[0],
)(*cmd[1:])
finally:
if args.standalone:
etcd_server.stop()
def test_etcd_server_start_stop(self):
server = EtcdServer()
server.start()
try:
port = server.get_port()
host = server.get_host()
self.assertGreater(port, 0)
self.assertEqual("localhost", host)
self.assertEqual(f"{host}:{port}", server.get_endpoint())
self.assertIsNotNone(server.get_client().version)
finally:
server.stop()
def test_etcd_server_with_rendezvous(self):
server = EtcdServer()
server.start()
client = etcd.Client(server.get_host(), server.get_port())
rdzv = EtcdRendezvous(
client=client,
prefix="test",
run_id=1,
num_min_workers=1,
num_max_workers=1,
timeout=60,
last_call_timeout=30,
)
rdzv_handler = EtcdRendezvousHandler(rdzv)
store, rank, world_size = rdzv_handler.next_rendezvous()
self.assertIsNotNone(store)
self.assertEqual(0, rank)
self.assertEqual(1, world_size)
def main(args=None):
# If ``args`` not passed, defaults to ``sys.argv[:1]``
args = parse_args(args)
min_nodes, max_nodes = parse_min_max_nnodes(args.nnodes)
assert 0 < min_nodes <= max_nodes
assert args.max_restarts >= 0
elastic_agent = None
if args.standalone:
etcd_server = EtcdServer()
etcd_server.start()
args.rdzv_backend = "etcd"
args.rdzv_endpoint = etcd_server.get_endpoint()
args.rdzv_id = str(uuid.uuid4())
log.info(f"\n**************************************\n"
f"Rendezvous info:\n"
f"--rdzv_backend={args.rdzv_backend} "
f"--rdzv_endpoint={args.rdzv_endpoint} "
f"--rdzv_id={args.rdzv_id}\n"
f"**************************************\n")
nproc_per_node = determine_local_world_size(args.nproc_per_node)
if "OMP_NUM_THREADS" not in os.environ and nproc_per_node > 1:
omp_num_threads = 1
print(
f"*****************************************\n"
f"Setting OMP_NUM_THREADS environment variable for each process to be "
f"{omp_num_threads} in default, to avoid your system being overloaded, "
f"please further tune the variable for optimal performance in "
f"your application as needed. \n"
f"*****************************************")
# This env variable will be passed down to the subprocesses
os.environ["OMP_NUM_THREADS"] = str(omp_num_threads)
with_python = not args.no_python
cmd = []
if with_python:
cmd = [sys.executable, "-u"]
if args.module:
cmd.append("-m")
else:
if args.module:
raise ValueError("Don't use both the '--no_python' flag"
" and the '--module' flag at the same time.")
cmd.append(args.training_script)
cmd.extend(args.training_script_args)
rdzv_parameters = RendezvousParameters(
backend=args.rdzv_backend,
endpoint=args.rdzv_endpoint,
run_id=args.rdzv_id,
min_nodes=min_nodes,
max_nodes=max_nodes,
**_parse_rendezvous_config(args.rdzv_conf),
)
rdzv_handler = rdzv_registry.get_rendezvous_handler(rdzv_parameters)
try:
spec = WorkerSpec(
role=args.role,
local_world_size=nproc_per_node,
entrypoint=cmd[0],
args=(*cmd[1:], ),
rdzv_handler=rdzv_handler,
max_restarts=args.max_restarts,
monitor_interval=args.monitor_interval,
redirects=Std.from_str(args.redirects),
tee=Std.from_str(args.tee),
)
metrics.initialize_metrics()
elastic_agent = LocalElasticAgent(spec=spec,
start_method=args.start_method,
log_dir=args.log_dir)
run_result = elastic_agent.run(spec.role)
events.record(
elastic_agent.get_agent_status_event(WorkerState.SUCCEEDED))
if run_result.is_failed():
# ChildFailedError is treated specially by @record
# if the error files for the failed children exist
# @record will copy the first error (root cause)
# to the error file of the launcher process
raise ChildFailedError(
name=args.training_script,
failures=run_result.failures,
)
except ChildFailedError:
raise
except Exception:
if elastic_agent:
events.record(
elastic_agent.get_agent_status_event(WorkerState.FAILED))
else:
events.record(_construct_event(args))
raise
finally:
rdzv_handler.shutdown()
if args.standalone:
etcd_server.stop()