def test_rank_and_size(self):
"""Tests two hosts, two slots each in standard happy path."""
slots = {'host-1': 2, 'host-2': 2}
discovery = FixedHosts(slots)
driver = ElasticDriver(mock.Mock(), discovery, min_np=2, max_np=4)
driver.wait_for_available_slots(min_np=2)
rank_results = {}
def exec_command(slot_info, events):
driver.record_ready(slot_info.hostname, slot_info.local_rank)
updated_slot_info = driver.get_slot_info(slot_info.hostname,
slot_info.local_rank)
rank_results[slot_info.rank] = (slot_info, updated_slot_info)
return 0, time.time()
driver.start(np=2, create_worker_fn=exec_command)
res = driver.get_results().worker_results
driver.stop()
assert len(res) == 4
for name, (exit_code, timestamp) in res.items():
assert exit_code == 0, name
assert len(rank_results) == 4
for rank, (slot_info, updated_slot_info) in rank_results.items():
assert slot_info.to_response_string(
) == updated_slot_info.to_response_string(), rank
def test_shutdown_on_success(self):
"""Tests that shutdown event is triggered when one worker succeeds but the others are still working."""
slots = {'host-1': 2, 'host-2': 2}
discovery = FixedHosts(slots)
driver = ElasticDriver(mock.Mock(), discovery, min_np=2, max_np=4)
driver.wait_for_available_slots(min_np=2)
def exec_command(slot_info, events):
if slot_info.rank == 0:
return 0, time.time()
driver.record_ready(slot_info.hostname, slot_info.local_rank)
wait_for_one(events)
return 1, time.time()
driver.start(np=2, create_worker_fn=exec_command)
res = driver.get_results().worker_results
driver.stop()
assert len(res) == 4
exit_code_sum = 0
for name, (exit_code, timestamp) in res.items():
exit_code_sum += exit_code
assert exit_code_sum == 3
def test_rank_and_size_with_host_failure(self):
"""Tests two hosts, two slots each with second host failing before rendezvous completes."""
slots = {'host-1': 2, 'host-2': 2}
discovery = FixedHosts(slots)
driver = ElasticDriver(mock.Mock(), discovery, min_num_proc=2, max_num_proc=4)
driver.wait_for_available_slots(min_num_proc=2)
rank_results = {}
def exec_command(slot_info, events):
if slot_info.hostname == 'host-2':
return 1, time.time()
driver.record_ready(slot_info.hostname, slot_info.local_rank)
updated_slot_info = driver.get_slot_info(slot_info.hostname, slot_info.local_rank)
rank_results[slot_info.rank] = (slot_info, updated_slot_info)
return 0, time.time()
driver.start(num_proc=2, create_worker_fn=exec_command)
res = driver.get_results().worker_results
driver.stop()
assert len(res) == 2
for name, (exit_code, timestamp) in res.items():
assert exit_code == 0, name
assert len(rank_results) == 2
for rank, (slot_info, updated_slot_info) in rank_results.items():
assert updated_slot_info.size == 2, rank
assert updated_slot_info.rank == slot_info.rank % 2, rank
assert updated_slot_info.local_size == slot_info.local_size, rank
assert updated_slot_info.local_rank == slot_info.local_rank, rank
assert updated_slot_info.cross_size == 1, rank
assert updated_slot_info.cross_rank == 0, rank
def test_rank_and_size_with_host_added(self):
"""Tests training starts with one host two slots, then a second host is added."""
slots = {'host-1': 2}
discovery = FixedHosts(slots)
def add_host():
slots = {'host-1': 2, 'host-2': 2}
discovery.set(slots)
driver = ElasticDriver(mock.Mock(), discovery, min_np=2, max_np=4)
driver.wait_for_available_slots(min_np=2)
rank_results = {}
def exec_command(slot_info, events):
driver.record_ready(slot_info.hostname, slot_info.local_rank)
if slot_info.hostname == 'host-1':
if slot_info.rank == 0:
add_host()
driver.wait_for_available_slots(4)
driver.record_ready(slot_info.hostname, slot_info.local_rank)
driver.record_ready(slot_info.hostname, slot_info.local_rank)
updated_slot_info = driver.get_slot_info(slot_info.hostname,
slot_info.local_rank)
rank_results[slot_info.rank] = (slot_info, updated_slot_info)
return 0, time.time()
driver.start(np=2, create_worker_fn=exec_command)
res = driver.get_results().worker_results
driver.stop()
assert len(res) == 4
for name, (exit_code, timestamp) in res.items():
assert exit_code == 0, name
assert len(rank_results) == 4
for rank, (slot_info, updated_slot_info) in rank_results.items():
assert updated_slot_info.size == 4, rank
assert updated_slot_info.rank == slot_info.rank, rank
assert updated_slot_info.local_size == slot_info.local_size, rank
assert updated_slot_info.local_rank == slot_info.local_rank, rank
assert updated_slot_info.cross_size == 2, rank
assert updated_slot_info.cross_rank == slot_info.cross_rank, rank
def test_all_workers_fail(self):
"""Tests that training fails when all workers fail."""
slots = {'host-1': 2, 'host-2': 2}
discovery = FixedHosts(slots)
driver = ElasticDriver(mock.Mock(), discovery, min_np=2, max_np=4)
driver.wait_for_available_slots(min_np=2)
def exec_command(slot_info, events):
driver.record_ready(slot_info.hostname, slot_info.local_rank)
return 1, time.time()
driver.start(np=2, create_worker_fn=exec_command)
res = driver.get_results().worker_results
driver.stop()
assert len(res) == 4
for name, (exit_code, timestamp) in res.items():
assert exit_code == 1, name
def test_worker_notification_manager(self):
"""Tests that host add events are sent to the worker notification service and consumed."""
slots = {'host-1': 2}
discovery = FixedHosts(slots)
rendezvous = RendezvousServer()
driver = ElasticDriver(rendezvous, discovery, min_np=2, max_np=4)
driver.wait_for_available_slots(min_np=2)
handler = create_rendezvous_handler(driver)
common_intfs = network.get_local_intfs()
addr = network.get_driver_ip(common_intfs)
port = rendezvous.start(handler)
nic = list(common_intfs)[0]
rank_results = {}
class NotificationReceiver:
def __init__(self):
self.events = []
def on_hosts_updated(self, timestamp, res):
self.events.append((timestamp, res))
def add_host():
slots = {'host-1': 2, 'host-2': 2}
discovery.set(slots)
def remove_host():
slots = {'host-2': 2}
discovery.set(slots)
def exec_command(slot_info, events):
manager = WorkerNotificationManager()
manager.init(rendezvous_addr=addr,
rendezvous_port=port,
nic=nic,
hostname=slot_info.hostname,
local_rank=slot_info.local_rank)
notification_receiver = NotificationReceiver()
manager.register_listener(notification_receiver)
driver.record_ready(slot_info.hostname, slot_info.local_rank)
if slot_info.rank == 0:
add_host()
driver.wait_for_available_slots(4)
if slot_info.rank == 0:
remove_host()
# Busy wait for the number of available slots to decrease
while driver._host_manager.current_hosts.count_available_slots(
) > 2:
time.sleep(0.01)
rank_results[slot_info.rank] = notification_receiver.events
return 0, time.time()
driver.start(np=2, create_worker_fn=exec_command)
res = driver.get_results().worker_results
driver.stop()
assert len(res) == 2
for name, (exit_code, timestamp) in res.items():
assert exit_code == 0, name
assert len(rank_results) == 2
for rank, events in rank_results.items():
expected = 2 if rank == 0 else 0
assert len(events) == expected, rank
if rank == 0:
# First update is an add
assert events[0][1] == HostUpdateResult.added
# Second update is a removal
assert events[1][1] == HostUpdateResult.removed
rendezvous.stop()