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# Owner(s): ["oncall: distributed"]
import os
import sys
from functools import partial, wraps
import torch
import torch.distributed as dist
if not dist.is_available():
print("Distributed not available, skipping tests", file=sys.stderr)
sys.exit(0)
from torch.testing._internal.common_distributed import MultiProcessTestCase, TEST_SKIPS
from torch.testing._internal.common_utils import run_tests, TEST_WITH_DEV_DBG_ASAN
if TEST_WITH_DEV_DBG_ASAN:
print(
"Skip dev-asan as torch + multiprocessing spawn have known issues",
file=sys.stderr,
)
sys.exit(0)
BACKEND = dist.Backend.NCCL if torch.cuda.is_available() else dist.Backend.GLOO
def with_comms(func=None):
if func is None:
return partial(
with_comms,
)
@wraps(func)
def wrapper(self, *args, **kwargs):
if BACKEND == dist.Backend.NCCL and torch.cuda.device_count() < self.world_size:
sys.exit(TEST_SKIPS[f"multi-gpu-{self.world_size}"].exit_code)
self.dist_init()
func(self)
self.destroy_comms()
return wrapper
class TestObjectCollectives(MultiProcessTestCase):
def setUp(self):
super().setUp()
os.environ["WORLD_SIZE"] = str(self.world_size)
os.environ["BACKEND"] = BACKEND
self._spawn_processes()
@property
def device(self):
return (
torch.device("cuda", self.rank % torch.cuda.device_count())
if BACKEND == dist.Backend.NCCL
else torch.device("cpu")
)
@property
def world_size(self):
if BACKEND == dist.Backend.NCCL:
return torch.cuda.device_count()
return super().world_size
@property
def process_group(self):
return dist.group.WORLD
def destroy_comms(self):
# Wait for all ranks to reach here before starting shutdown.
dist.barrier()
dist.destroy_process_group()
def dist_init(self):
dist.init_process_group(
backend=BACKEND,
world_size=self.world_size,
rank=self.rank,
init_method=f"file://{self.file_name}",
)
# set device for nccl pg for collectives
if BACKEND == "nccl":
torch.cuda.set_device(self.rank)
@with_comms()
def test_all_gather_object(self):
output = [None] * dist.get_world_size()
dist.all_gather_object(object_list=output, obj=self.rank)
for i, v in enumerate(output):
self.assertEqual(i, v, f"rank: {self.rank}")
@with_comms()
def test_gather_object(self):
output = [None] * dist.get_world_size() if self.rank == 0 else None
dist.gather_object(obj=self.rank, object_gather_list=output)
if self.rank == 0:
for i, v in enumerate(output):
self.assertEqual(i, v, f"rank: {self.rank}")
@with_comms()
def test_send_recv_object_list(self):
val = 99 if self.rank == 0 else None
object_list = [val] * dist.get_world_size()
if self.rank == 0:
dist.send_object_list(object_list, 1)
if self.rank == 1:
dist.recv_object_list(object_list, 0)
if self.rank < 2:
self.assertEqual(99, object_list[0])
else:
self.assertEqual(None, object_list[0])
@with_comms()
def test_broadcast_object_list(self):
val = 99 if self.rank == 0 else None
object_list = [val] * dist.get_world_size()
# TODO test with broadcast_object_list's device argument
dist.broadcast_object_list(object_list=object_list)
self.assertEqual(99, object_list[0])
@with_comms()
def test_scatter_object_list(self):
input_list = list(range(dist.get_world_size())) if self.rank == 0 else None
output_list = [None]
dist.scatter_object_list(
scatter_object_output_list=output_list, scatter_object_input_list=input_list
)
self.assertEqual(self.rank, output_list[0])
# Test Object Collectives With Sub Pg
def setup_sub_pg(self):
rank = dist.get_rank()
base_rank = rank - (rank % 2)
ranks = [base_rank, base_rank + 1]
my_pg = dist.new_group(ranks, use_local_synchronization=True)
return rank, ranks, my_pg
@with_comms()
def test_subpg_scatter_object(self):
rank, ranks, my_pg = self.setup_sub_pg()
out_list = [None]
dist.scatter_object_list(out_list, ranks, src=ranks[0], group=my_pg)
self.assertEqual(rank, out_list[0])
@with_comms()
def test_subpg_all_gather_object(self):
rank, ranks, my_pg = self.setup_sub_pg()
out_list = [None] * len(ranks)
dist.all_gather_object(out_list, rank, group=my_pg)
self.assertEqual(ranks, out_list)
@with_comms()
def test_subpg_gather_object(self):
rank, ranks, my_pg = self.setup_sub_pg()
out_list = [None] * len(ranks) if rank == ranks[0] else None
dist.gather_object(rank, out_list, dst=ranks[0], group=my_pg)
if rank == ranks[0]:
self.assertEqual(ranks, out_list)
@with_comms()
def test_subpg_broadcast_object(self):
rank, ranks, my_pg = self.setup_sub_pg()
out_list = [None]
if rank == ranks[0]:
out_list[0] = rank
dist.broadcast_object_list(out_list, src=ranks[0], group=my_pg)
self.assertEqual(ranks[0], out_list[0])
if __name__ == "__main__":
run_tests()
|
