def test_sync_params_no_buffers(self):
# Set up process group.
store = c10d.TCPStore('localhost', self.port, self.is_master)
options = c10d.ProcessGroupGloo.Options()
options.devices = [
c10d.ProcessGroupGloo.create_tcp_device(interface="lo")
]
process_group = c10d.ProcessGroupGloo(store, self.rank,
self.world_size, options)
# Use all available devices on every process here (data is small, so should be fine).
devices = gpus_for_rank(self.world_size)[self.rank]
target = torch.arange(10, dtype=torch.float64,
device='cuda:0').chunk(5)
parameter_data = [target]
parameter_data += [
torch.zeros(10, device=torch.device('cuda', d)).chunk(5)
for d in devices[1:]
]
buffer_data = [[]] * len(parameter_data)
c10d._sync_params(process_group,
parameter_data=parameter_data,
buffer_data=buffer_data,
devices=devices,
broadcast_bucket_size=10,
broadcast_buffers=False)
for device_data in parameter_data:
for i, parameter in enumerate(device_data):
self.assertEqual(parameter, target[i])
def test_sync_params_with_buffers(self):
store = c10d.FileStore(self.file.name)
options = c10d.ProcessGroupGloo.Options()
options.devices = [c10d.ProcessGroupGloo.create_tcp_device(interface="lo")]
process_group = c10d.ProcessGroupGloo(store, self.rank, self.world_size, options)
devices = gpus_for_rank(self.world_size)[self.rank]
target = torch.arange(10, dtype=torch.float64, device='cuda:0').chunk(5)
parameter_data = [target]
parameter_data += [torch.zeros(10, device=torch.device('cuda', d)).chunk(5) for d in devices[1:]]
# sync_params should do a dist_broadcast for buffers, so we only populate the master buffers and
# then check that other processes' tensors end up matching.
if self.is_master:
buffer_data = [target]
buffer_data += [torch.zeros(10, device=torch.device('cuda', d)).chunk(5) for d in devices[1:]]
else:
buffer_data = [torch.zeros(10, device=torch.device('cuda', d)).chunk(5) for d in devices]
c10d._sync_params(
process_group,
parameter_data=parameter_data,
buffer_data=buffer_data,
devices=devices,
broadcast_bucket_size=10,
broadcast_buffers=True)
for device_data in parameter_data:
for i, parameter in enumerate(device_data):
self.assertEqual(parameter, target[i])
for device_data in buffer_data:
for i, buffer in enumerate(device_data):
self.assertEqual(buffer, target[i])
