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test_c10d_spawn.py
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test_c10d_spawn.py
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import copy
import os
import sys
import tempfile
import unittest
import torch
import torch.distributed as c10d
import torch.multiprocessing as mp
import torch.nn as nn
from torch.testing._internal.common_cuda import TEST_CUDA, TEST_MULTIGPU
from torch.testing._internal.common_distributed import requires_gloo, \
create_device
from torch.testing._internal.common_utils import TestCase, load_tests, \
run_tests, skipIfRocm
from torch.testing._internal.common_utils import NO_MULTIPROCESSING_SPAWN, TEST_WITH_TSAN
# load_tests from common_utils is used to automatically filter tests for
# sharding on sandcastle. This line silences flake warnings
load_tests = load_tests
if not c10d.is_available():
print('c10d not available, skipping tests', file=sys.stderr)
sys.exit(0)
if NO_MULTIPROCESSING_SPAWN:
print('spawn not available, skipping tests', file=sys.stderr)
sys.exit(0)
NO_NCCL = not hasattr(c10d, "ProcessGroupNCCL")
class ProcessGroupShareTensorTest(TestCase):
world_size = 2
@classmethod
def opts(cls, threads=2):
opts = c10d.ProcessGroupGloo.Options()
opts.devices = [create_device(interface='lo')]
opts.timeout = 5.0
opts.threads = threads
return opts
@classmethod
def _init_pg_gloo(cls, rank, filename, world_size):
store = c10d.FileStore(filename, world_size)
return c10d.ProcessGroupGloo(
store, rank, world_size, ProcessGroupShareTensorTest.opts())
@classmethod
def _init_pg_nccl(cls, rank, filename, world_size):
store = c10d.FileStore(filename, world_size)
return c10d.ProcessGroupNCCL(store, rank, world_size)
def _test_multiprocess(self, f, shared_tensors, init_pg, n_output):
ws = self.world_size
# file store will delete the test file on destruction
file = tempfile.NamedTemporaryFile(delete=False)
ctx = mp.get_context('spawn')
c2p = ctx.Queue(2)
p2c = ctx.Queue(2)
ps = []
for i in range(ws):
p = ctx.Process(
target=f,
args=(i, file.name, shared_tensors, ws, init_pg, c2p, p2c))
p.start()
ps.append(p)
for _ in range(ws * n_output):
pid, expected, result = c2p.get()
self.assertEqual(
expected,
result,
msg=(
"Expect rank {} to receive tensor {} but got {}."
).format(pid, expected, result)
)
for _ in range(ws):
p2c.put(0)
for p in ps:
p.join(2)
# Why classmethod? multiprocessing cannot pickle TestCase subclass when in
# spawn mode. See https://bugs.python.org/issue33884.
@classmethod
def _test_broadcast_process(
cls, rank, filename, shared_tensors, world_size, init_pg, c2p, p2c):
pg = init_pg(rank, filename, world_size)
xs = [shared_tensors[rank]]
pg.broadcast(xs).wait()
c2p.put((rank, torch.zeros(2, 2), xs[0].to("cpu")))
p2c.get()
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
def test_shared_broadcast_gloo(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_broadcast_process,
[torch.ones(2, 2).to(i) * i for i in range(self.world_size)],
ProcessGroupShareTensorTest._init_pg_gloo,
1)
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
@unittest.skipIf(NO_NCCL, "NCCL needed")
def test_shared_broadcast_nccl(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_broadcast_process,
[torch.ones(2, 2).to(i) * i for i in range(self.world_size)],
ProcessGroupShareTensorTest._init_pg_nccl,
1)
@classmethod
def _test_allreduce_process(
cls, rank, filename, shared_tensors, world_size, init_pg, c2p, p2c):
pg = init_pg(rank, filename, world_size)
xs = [shared_tensors[rank]]
pg.allreduce(xs, op=c10d.ReduceOp.SUM).wait()
c2p.put((rank, torch.ones(2, 2) * 2, xs[0].to("cpu")))
p2c.get()
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
def test_shared_allreduce_gloo(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_allreduce_process,
[torch.ones(2, 2).to(i) for i in range(self.world_size)],
ProcessGroupShareTensorTest._init_pg_gloo,
1)
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
@unittest.skipIf(NO_NCCL, "NCCL needed")
def test_shared_allreduce_nccl(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_allreduce_process,
[torch.ones(2, 2).to(i) for i in range(self.world_size)],
ProcessGroupShareTensorTest._init_pg_nccl,
1)
@classmethod
def _test_reduce_process(
cls, rank, filename, shared_tensors, world_size, init_pg, c2p, p2c):
pg = init_pg(rank, filename, world_size)
x = shared_tensors[rank]
pg.reduce(x, root=0, op=c10d.ReduceOp.SUM).wait()
if rank == 0:
c2p.put((rank, torch.ones(2, 2) * 2, x.to("cpu")))
else:
c2p.put((rank, torch.ones(2, 2), x.to("cpu")))
p2c.get()
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
@unittest.skipIf(NO_NCCL, "NCCL needed")
def test_shared_reduce_nccl(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_reduce_process,
[torch.ones(2, 2).to(i) for i in range(self.world_size)],
ProcessGroupShareTensorTest._init_pg_nccl,
1)
@classmethod
def _test_allgather_process(
cls, rank, filename, shared_tensors, world_size, init_pg, c2p, p2c):
pg = init_pg(rank, filename, world_size)
xs = [shared_tensors[rank]]
ys = [[torch.zeros_like(xs[0]) for i in range(world_size)]]
pg.allgather(ys, xs).wait()
for i in range(world_size):
c2p.put((rank, torch.ones(2, 2) * i, ys[0][i].to("cpu")))
p2c.get()
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
def test_shared_allgather_gloo(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_allgather_process,
[torch.ones(2, 2).to(i) * i for i in range(self.world_size)],
ProcessGroupShareTensorTest._init_pg_gloo,
self.world_size)
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
@unittest.skipIf(NO_NCCL, "NCCL needed")
def test_shared_allgather_nccl(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_allgather_process,
[torch.ones(2, 2).to(i) * i for i in range(self.world_size)],
ProcessGroupShareTensorTest._init_pg_nccl,
self.world_size)
@classmethod
def _test_allgather_chunk_process(
cls, rank, filename, shared_tensor, world_size, init_pg, c2p, p2c):
pg = init_pg(rank, filename, world_size)
chunks = torch.chunk(shared_tensor, world_size, dim=0)
x = chunks[rank]
ys = [torch.zeros_like(x) for _ in range(world_size)]
pg.allgather(ys, x).wait()
c2p.put((rank, chunks[0].to("cpu"), ys[0].to("cpu")))
c2p.put((rank, chunks[1].to("cpu"), ys[1].to("cpu")))
p2c.get()
@unittest.skipIf(not TEST_MULTIGPU, "At least 2 CUDA GPUS needed")
def test_shared_allgather_chunk_gloo(self):
self._test_multiprocess(
ProcessGroupShareTensorTest._test_allgather_chunk_process,
torch.tensor(range(4)).reshape(2, 2),
ProcessGroupShareTensorTest._init_pg_gloo,
self.world_size)
@unittest.skipIf(TEST_WITH_TSAN, "TSAN is not fork-safe since we're forking in a multi-threaded environment")
class DistributedDataParallelSingleProcessTest(TestCase):
def setUp(self):
self.rank = 0
self.world_size = 1
self.file = tempfile.NamedTemporaryFile(delete=False) # noqa: P201
def tearDown(self):
try:
os.remove(self.file.name)
except OSError:
pass
def _test_base(self, net, inp, check_allclose=True):
store = c10d.FileStore(self.file.name, self.world_size)
process_group = c10d.ProcessGroupGloo(store, self.rank, self.world_size)
if inp[0].is_cuda:
num_gpus = torch.cuda.device_count()
batch_size = inp[0].size(0)
# batch_size must be evenly divisible by num_gpus_used, take the largest one
num_gpus_used = [i for i in range(1, num_gpus + 1) if batch_size % i == 0][-1]
device_ids = list(range(num_gpus_used))
else:
device_ids = None
ddp = nn.parallel.DistributedDataParallel(
copy.deepcopy(net),
device_ids=device_ids,
process_group=process_group
)
net_opt = torch.optim.Adam(net.parameters(), lr=0.001)
ddp_opt = torch.optim.Adam(ddp.parameters(), lr=0.001)
for i, j in zip(ddp.parameters(), net.parameters()):
self.assertTrue(i.allclose(j))
for _ in range(10):
net_out = net(*inp)
ddp_out = ddp(*inp)
net_out.sum().backward()
ddp_out.sum().backward()
net_opt.step()
ddp_opt.step()
if check_allclose:
for i, j in zip(ddp.parameters(), net.parameters()):
self.assertTrue(i.allclose(j))
@requires_gloo()
def test_cpu(self):
self._test_base(nn.Linear(2, 2), [torch.randn(30, 2)])
@requires_gloo()
@unittest.skipIf(not TEST_CUDA, "At least 1 CUDA GPUS needed")
def test_cuda(self):
self._test_base(nn.Linear(2, 2).to(0), [torch.randn(30, 2).to(0)])
@requires_gloo()
@unittest.skipIf(not TEST_CUDA, "At least 1 CUDA GPUS needed")
@skipIfRocm
def test_rnn(self):
# This test is inspired by the bug reported in
# https://github.com/pytorch/pytorch/issues/36268
BATCH_SIZE = 12 # Divisible by 2, 3, 4
INPUT_DIM = 256
OUTPUT_DIM = 256
HIDDEN_DIM = 256
N_LAYERS = 3
SEQ_LEN = 100
class Net(nn.Module):
def __init__(self, input_dim, hidden_dim, output_dim, hidden_layers):
super(Net, self).__init__()
self.input_dim = input_dim
self.hidden_dim = hidden_dim
self.output_dim = output_dim
self.hidden_layers = hidden_layers
self.lstm = nn.LSTM(input_dim, hidden_dim, hidden_layers, batch_first=True)
self.h2o = nn.Linear(hidden_dim, output_dim)
def forward(self, x, y):
self.lstm.flatten_parameters()
h_t, _ = self.lstm(x)
output = self.h2o(h_t)
loss = nn.functional.mse_loss(output, y)
return loss
net = Net(INPUT_DIM, HIDDEN_DIM, OUTPUT_DIM, N_LAYERS).to(0)
inp = [
torch.randn((BATCH_SIZE, SEQ_LEN, INPUT_DIM)).to(0),
torch.rand((BATCH_SIZE, SEQ_LEN, OUTPUT_DIM)).to(0)
]
# Not checking result allclose as the parameter inconsistency exist
# prior to this change. See #37079
self._test_base(net, inp, check_allclose=False)
if __name__ == '__main__':
run_tests()