| import fcntl |
| import multiprocessing |
| import os |
| import sys |
| import copy |
| import time |
| import unittest |
| from functools import wraps, reduce |
| from contextlib import contextmanager |
| |
| import torch |
| import torch.cuda |
| import torch.nn as nn |
| import torch.distributed as dist |
| import torch.optim as optim |
| import torch.nn.functional as F |
| from torch.autograd import Variable |
| from common import TestCase |
| |
| BACKEND = os.environ['BACKEND'] |
| TEMP_DIR = os.environ['TEMP_DIR'] |
| INIT_METHOD = os.getenv('INIT_METHOD', 'env://') |
| MASTER_PORT = '29500' |
| MASTER_ADDR = '127.0.0.1' |
| |
| DEFAULT_TIMEOUT = 15 |
| CUSTOMIZED_TIMEOUT = {'test_DistributedDataParallel': 25} |
| |
| |
| def get_timeout(test_id): |
| test_name = test_id.split('.')[-1] |
| if test_name in CUSTOMIZED_TIMEOUT: |
| return CUSTOMIZED_TIMEOUT[test_name] |
| else: |
| return DEFAULT_TIMEOUT |
| |
| |
| if not dist.is_available(): |
| print('Distributed not available, skipping tests') |
| sys.exit(0) |
| |
| SKIP_IF_NO_CUDA_EXIT_CODE = 75 |
| SKIP_IF_NO_GPU_EXIT_CODE = 76 |
| SKIP_IF_SMALL_WORLDSIZE_EXIT_CODE = 77 |
| |
| |
| def skip_if_no_cuda_distributed(func): |
| func.skip_if_no_cuda_distributed = True |
| |
| @wraps(func) |
| def wrapper(*args, **kwargs): |
| if not torch.cuda.is_available(): |
| sys.exit(SKIP_IF_NO_CUDA_EXIT_CODE) |
| |
| return func(*args, **kwargs) |
| return wrapper |
| |
| |
| def skip_if_no_gpu(func): |
| """ Nccl multigpu tests requires at least 2 GPUS. Skip if this is not met""" |
| func.skip_if_no_gpu = True |
| |
| @wraps(func) |
| def wrapper(*args, **kwargs): |
| if not torch.cuda.is_available(): |
| sys.exit(SKIP_IF_NO_CUDA_EXIT_CODE) |
| if torch.cuda.device_count() < int(os.environ['WORLD_SIZE']): |
| sys.exit(SKIP_IF_NO_GPU_EXIT_CODE) |
| |
| return func(*args, **kwargs) |
| return wrapper |
| |
| |
| def skip_if_small_worldsize(func): |
| func.skip_if_small_worldsize = True |
| |
| @wraps(func) |
| def wrapper(*args, **kwargs): |
| if (os.environ['BACKEND'] != "mpi") and int(os.environ['WORLD_SIZE']) <= 2: |
| sys.exit(SKIP_IF_SMALL_WORLDSIZE_EXIT_CODE) |
| |
| return func(*args, **kwargs) |
| return wrapper |
| |
| |
| def apply_hack_for_nccl(): |
| # This is a hack for a known NCCL issue using multiprocess |
| # in conjunction with multiple threads to manage different GPUs which |
| # may cause ncclCommInitRank to fail. |
| # http://docs.nvidia.com/deeplearning/sdk/nccl-release-notes/rel_2.1.4.html#rel_2.1.4 |
| # It slows down the performance of collective operations. |
| # Without this setting NCCL might throw unhandled error. |
| os.environ['NCCL_MAX_NRINGS'] = '1' |
| |
| |
| @contextmanager |
| def _lock(): |
| lockfile = os.path.join(TEMP_DIR, 'lockfile') |
| with open(lockfile, 'w') as lf: |
| try: |
| fcntl.flock(lf.fileno(), fcntl.LOCK_EX) |
| yield |
| finally: |
| fcntl.flock(lf.fileno(), fcntl.LOCK_UN) |
| lf.close() |
| |
| |
| def _build_tensor(size, value=None): |
| if value is None: |
| value = size |
| return torch.FloatTensor(size, size, size).fill_(value) |
| |
| |
| class Barrier(object): |
| barrier_id = 0 |
| |
| @classmethod |
| def init(cls): |
| cls.barrier_id = 0 |
| barrier_dir = os.path.join(TEMP_DIR, 'barrier') |
| for f_name in os.listdir(barrier_dir): |
| os.unlink(os.path.join(barrier_dir, f_name)) |
| |
| @classmethod |
| def sync(cls, timeout=5): |
| cls.barrier_id += 1 |
| barrier_dir = os.path.join(TEMP_DIR, 'barrier') |
| pid = str(os.getpid()) |
| barrier_file = os.path.join(barrier_dir, pid) |
| with _lock(): |
| with open(barrier_file, 'w') as f: |
| f.write(str(cls.barrier_id)) |
| |
| start_time = time.time() |
| while True: |
| arrived = 0 |
| with _lock(): |
| for f_name in os.listdir(barrier_dir): |
| with open(os.path.join(barrier_dir, f_name), 'r') as f: |
| data = f.read() |
| if int(data) >= cls.barrier_id: |
| arrived += 1 |
| if arrived == dist.get_world_size(): |
| break |
| |
| if time.time() - start_time > timeout: |
| raise RuntimeError("barrier timeout") |
| time.sleep(0.1) |
| |
| |
| class _DistTestBase(object): |
| |
| def _barrier(self, *args, **kwargs): |
| Barrier.sync(*args, **kwargs) |
| |
| def _init_group_test(self): |
| group = [1, 2] |
| group_id = dist.new_group(group) |
| rank = dist.get_rank() |
| if rank not in group: |
| return ([], None, rank) |
| |
| return (group, group_id, rank) |
| |
| def _init_global_test(self): |
| group = [i for i in range(0, dist.get_world_size())] |
| group_id = dist.group.WORLD |
| rank = dist.get_rank() |
| return (group, group_id, rank) |
| |
| # HELPER FOR MULTIGPU TESTS |
| def _init_multigpu_helper(self): |
| """Multigpu tests are designed to simulate the multi nodes with multi |
| GPUs on each node. Nccl backend requires equal #GPUs in each process. |
| On a single node, all visible GPUs are evenly |
| divided to subsets, each process only uses a subset. |
| """ |
| nGPUs = torch.cuda.device_count() |
| world_size = dist.get_world_size() |
| visible_devices = range(nGPUs) |
| |
| if BACKEND == 'nccl': |
| apply_hack_for_nccl() |
| |
| nGPUs_per_process = nGPUs // world_size |
| rank_to_GPU = {i: list(visible_devices[i * nGPUs_per_process: (i + 1) * nGPUs_per_process]) |
| for i in range(world_size)} |
| return rank_to_GPU |
| |
| # GET RANK |
| def test_get_rank(self): |
| test_dir = os.path.join(TEMP_DIR, 'test_dir') |
| pid = str(os.getpid()) |
| num_processes = dist.get_world_size() |
| with open(os.path.join(test_dir, pid), 'w') as f: |
| f.write(str(dist.get_rank())) |
| |
| self._barrier() |
| |
| all_ranks = set() |
| for f_name in os.listdir(test_dir): |
| with open(os.path.join(test_dir, f_name), 'r') as f: |
| all_ranks.add(int(f.read())) |
| self.assertEqual(len(all_ranks), num_processes) |
| |
| self._barrier() |
| |
| if dist.get_rank() == 0: |
| for f_name in os.listdir(test_dir): |
| os.unlink(os.path.join(test_dir, f_name)) |
| |
| self._barrier() |
| |
| # SEND RECV |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support send/recv") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support send/recv") |
| def test_send_recv(self): |
| rank = dist.get_rank() |
| tensor = _build_tensor(rank + 1) |
| for dest in range(0, dist.get_world_size()): |
| if dest == rank: |
| continue |
| dist.send(tensor, dest) |
| |
| for src in range(0, dist.get_world_size()): |
| if src == rank: |
| continue |
| tensor = _build_tensor(src + 1, value=-1) |
| expected_tensor = _build_tensor(src + 1) |
| dist.recv(tensor, src) |
| self.assertEqual(tensor, expected_tensor) |
| |
| self._barrier() |
| |
| # SEND RECV ANY SOURCE |
| @unittest.skipIf(BACKEND == 'gloo', |
| "Gloo does not support send/recv from any source") |
| @unittest.skipIf(BACKEND == 'nccl', |
| "Nccl does not support send/recv from any source") |
| def test_send_recv_any_source(self): |
| rank = dist.get_rank() |
| tensor = _build_tensor(10, rank) |
| for dest in range(0, dist.get_world_size()): |
| if dest == rank: |
| continue |
| dist.send(tensor, dest) |
| |
| recv_ranks = set() |
| for src in range(0, dist.get_world_size()): |
| if src == rank: |
| continue |
| tensor = _build_tensor(10, value=-1) |
| sender = dist.recv(tensor) |
| self.assertTrue(tensor.eq(sender).all()) |
| recv_ranks.add(sender) |
| |
| self.assertEqual(len(recv_ranks), dist.get_world_size() - 1) |
| self._barrier() |
| |
| # ISEND |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support isend") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support isend") |
| def test_isend(self): |
| rank = dist.get_rank() |
| world_size = dist.get_world_size() |
| |
| if rank == 0: |
| requests = [ |
| dist.isend(_build_tensor(dest, 10), dest) for dest in range(1, world_size) |
| ] |
| for request in requests: |
| request.wait() |
| self.assertTrue(request.is_completed()) |
| else: |
| tensor = _build_tensor(rank, -1) |
| dist.recv(tensor, 0) |
| self.assertEqual(tensor, _build_tensor(rank, 10)) |
| |
| self._barrier() |
| |
| # IRECV |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support irecv") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support irecv") |
| def test_irecv(self): |
| rank = dist.get_rank() |
| world_size = dist.get_world_size() |
| |
| if rank == 0: |
| expected_tensors = [_build_tensor(src, -1) for src in range(1, world_size)] |
| requests = [ |
| dist.irecv(expected_tensors[src - 1], src) for src in range(1, world_size) |
| ] |
| |
| for src in range(1, world_size): |
| requests[src - 1].wait() |
| self.assertTrue(requests[src - 1].is_completed()) |
| self.assertEqual(expected_tensors[src - 1], _build_tensor(src, 10)) |
| else: |
| tensor = _build_tensor(rank, 10) |
| dist.send(tensor, 0) |
| |
| self._barrier() |
| |
| # BROADCAST |
| def _test_broadcast_helper(self, group, group_id, rank, cuda=False, rank_to_GPU=None): |
| for ttype, value, requires_cuda in [ |
| ('torch.FloatTensor', -1e-10, False), |
| ('torch.DoubleTensor', -1e-100, False), |
| ('torch.HalfTensor', -0.1, True), |
| ('torch.CharTensor', -2, False), |
| ('torch.ByteTensor', 129, False), |
| ('torch.IntTensor', -1e5, False), |
| ('torch.LongTensor', -1e15, False), |
| ]: |
| if requires_cuda and not cuda: |
| continue |
| for src in group: |
| expected_tensor = _build_tensor(src + 1, value).type(ttype) |
| if cuda: |
| expected_tensor = expected_tensor.cuda(rank_to_GPU[rank][0]) |
| if rank == src: |
| dist.broadcast(expected_tensor, src, group_id) |
| else: |
| tensor = _build_tensor(src + 1, -1).type(ttype) |
| if cuda: |
| tensor = tensor.cuda(rank_to_GPU[rank][0]) |
| dist.broadcast(tensor, src, group_id) |
| self.assertEqual(tensor.size(), expected_tensor.size()) |
| self.assertEqual(tensor.ne(expected_tensor).max(), 0) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_broadcast(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_broadcast_helper(group, group_id, rank) |
| |
| @unittest.skipIf(BACKEND != 'gloo' and BACKEND != 'nccl', |
| "Only Gloo and Nccl backend supports CUDA allReduce") |
| @skip_if_no_cuda_distributed |
| @skip_if_no_gpu |
| def test_broadcast_cuda(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_broadcast_helper(group, group_id, rank, True, rank_to_GPU) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_broadcast_group(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_broadcast_helper(group, group_id, rank) |
| |
| # REDUCE |
| def _test_reduce_helper(self, group, group_id, rank, op, master_value, |
| worker_value, expected_value, cuda=False, rank_to_GPU=None): |
| for src in group: |
| if rank == src: |
| tensor = _build_tensor(src + 1).fill_(master_value) |
| if cuda: |
| tensor = tensor.cuda(rank_to_GPU[rank][0]) |
| dist.reduce(tensor, src, op, group_id) |
| self.assertEqual(tensor, _build_tensor(src + 1, expected_value)) |
| else: |
| tensor = _build_tensor(src + 1).fill_(worker_value) |
| if cuda: |
| tensor = tensor.cuda(rank_to_GPU[rank][0]) |
| dist.reduce(tensor, src, op, group_id) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_reduce_sum(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.SUM, |
| 2, 10, 2 + (10 * (len(group) - 1)) |
| ) |
| |
| @unittest.skipIf(BACKEND != 'nccl', "Only Nccl supports CUDA reduce") |
| @skip_if_no_cuda_distributed |
| @skip_if_no_gpu |
| def test_reduce_sum_cuda(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.SUM, 2, 10, |
| 2 + 10 * (len(group) - 1), True, rank_to_GPU) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_reduce_product(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.PRODUCT, |
| 2, 10, reduce((lambda x, y: x * y), [10] * (len(group) - 1), 2) |
| ) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_reduce_min(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MIN, 1010, 1, 1 |
| ) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_reduce_max(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MAX, -1, 10, 10 |
| ) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_reduce_group_sum(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.SUM, 2, 10, 2 + (10 * (len(group) - 1)) |
| ) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_reduce_group_product(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.PRODUCT, |
| 2, 10, reduce((lambda x, y: x * y), [10] * (len(group) - 1), 2) |
| ) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_reduce_group_min(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MIN, 1010, 1, 1 |
| ) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support reduce") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_reduce_group_max(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MAX, -1, 10, 10 |
| ) |
| |
| # ALL REDUCE |
| def _test_all_reduce_helper(self, group, group_id, rank, op, master_value, |
| worker_value, expected_value, cuda=False, rank_to_GPU=None): |
| for src in group: |
| if rank == src: |
| tensor = _build_tensor(src + 1).fill_(master_value) |
| if cuda: |
| tensor = tensor.cuda(rank_to_GPU[rank][0]) |
| dist.all_reduce(tensor, op, group_id) |
| self.assertEqual(tensor, _build_tensor(src + 1, expected_value)) |
| else: |
| tensor = _build_tensor(src + 1).fill_(worker_value) |
| if cuda: |
| tensor = tensor.cuda(rank_to_GPU[rank][0]) |
| dist.all_reduce(tensor, op, group_id) |
| self.assertEqual(tensor, _build_tensor(src + 1, expected_value)) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_all_reduce_sum(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.SUM, 2, 10, 2 + (10 * (len(group) - 1)) |
| ) |
| |
| @unittest.skipIf(BACKEND != 'gloo' and BACKEND != 'nccl', |
| "Only Gloo & Nccl backend support CUDA allReduce") |
| @skip_if_no_cuda_distributed |
| @skip_if_no_gpu |
| def test_all_reduce_sum_cuda(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.SUM, 2, 10, 2 + (10 * (len(group) - 1)), True, rank_to_GPU |
| ) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_all_reduce_product(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.PRODUCT, |
| 2, 10, reduce((lambda x, y: x * y), [10] * (len(group) - 1), 2) |
| ) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_all_reduce_min(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MIN, 1010, 1, 1 |
| ) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_all_reduce_max(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MAX, -1, 10, 10 |
| ) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_all_reduce_group_sum(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.SUM, 2, 10, 2 + (10 * (len(group) - 1)) |
| ) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_all_reduce_group_product(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.PRODUCT, |
| 2, 10, reduce((lambda x, y: x * y), [10] * (len(group) - 1), 2) |
| ) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_all_reduce_group_min(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MIN, 1010, 1, 1 |
| ) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_all_reduce_group_max(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_all_reduce_helper( |
| group, group_id, rank, dist.reduce_op.MAX, -1, 10, 10 |
| ) |
| |
| # SCATTER |
| def _test_scatter_helper(self, group, group_id, rank): |
| for dest in group: |
| tensor = _build_tensor(dest + 1, -1) |
| expected_tensor = _build_tensor(dest + 1, rank) |
| tensors = [_build_tensor(dest + 1, i) for i in group] if rank == dest else [] |
| dist.scatter(tensor, src=dest, scatter_list=tensors, group=group_id) |
| self.assertEqual(tensor, expected_tensor) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support scatter") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support scatter") |
| def test_scatter(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_scatter_helper(group, group_id, rank) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support scatter") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support scatter") |
| @skip_if_small_worldsize |
| def test_scatter_group(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_scatter_helper(group, group_id, rank) |
| |
| # GATHER |
| def _test_gather_helper(self, group, group_id, rank): |
| for dest in group: |
| tensor = _build_tensor(dest + 1, rank) |
| tensors = [_build_tensor(dest + 1, -1) for i in group] if rank == dest else [] |
| dist.gather(tensor, dst=dest, gather_list=tensors, group=group_id) |
| if rank == dest: |
| expected_tensors = [_build_tensor(dest + 1, i) for i in group] |
| for t1, t2 in zip(tensors, expected_tensors): |
| self.assertEqual(t1, t2) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support gather") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_gather(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_gather_helper(group, group_id, rank) |
| |
| @unittest.skipIf(BACKEND == 'gloo', "Gloo does not support gather") |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_gather_group(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_gather_helper(group, group_id, rank) |
| |
| # ALL GATHER |
| def _test_all_gather_helper(self, group, group_id, rank, cuda=False, rank_to_GPU=None): |
| for dest in group: |
| tensor = _build_tensor(dest + 1, rank) |
| tensors = [_build_tensor(dest + 1, -1) for i in group] |
| if cuda: |
| tensor = tensor.cuda(rank_to_GPU[rank][0]) |
| tensors = [t.cuda(rank_to_GPU[rank][0]) for t in tensors] |
| dist.all_gather(tensors, tensor, group_id) |
| |
| expected_tensors = [_build_tensor(dest + 1, i) for i in group] |
| for t1, t2 in zip(tensors, expected_tensors): |
| self.assertEqual(t1, t2) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_all_gather(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_all_gather_helper(group, group_id, rank) |
| |
| @unittest.skipIf(BACKEND != 'nccl', "Only Nccl supports CUDA all gather") |
| @skip_if_no_cuda_distributed |
| @skip_if_no_gpu |
| def test_all_gather_cuda(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_all_gather_helper(group, group_id, rank, True, rank_to_GPU) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_all_gather_group(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_all_gather_helper(group, group_id, rank) |
| |
| # BARRIER |
| def _test_barrier_helper(self, group, group_id, rank): |
| WAIT_TIME = 0.3 # seconds |
| |
| for dest in group: |
| expected_time = torch.DoubleTensor(1).fill_(0.0) |
| if dest == rank: |
| expected_time.fill_(time.time() + WAIT_TIME) |
| dist.broadcast(expected_time, dest, group_id) |
| time.sleep(WAIT_TIME + 0.1) # sleep a little bit longer |
| dist.barrier(group_id) |
| else: |
| dist.broadcast(expected_time, dest, group_id) |
| dist.barrier(group_id) |
| self.assertGreaterEqual(time.time(), expected_time[0]) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support CPU tensors") |
| def test_barrier(self): |
| group, group_id, rank = self._init_global_test() |
| self._test_barrier_helper(group, group_id, rank) |
| |
| @unittest.skipIf(BACKEND == 'nccl', "Nccl does not support newGroup") |
| @skip_if_small_worldsize |
| def test_barrier_group(self): |
| group, group_id, rank = self._init_group_test() |
| self._test_barrier_helper(group, group_id, rank) |
| |
| def _test_broadcast_multigpu_helper(self, group, group_id, |
| rank, rank_to_GPU): |
| for src in group: |
| expected_tensor = _build_tensor(src + 1) |
| tensors = [_build_tensor(src + 1, -1).cuda(device=i) |
| for i in rank_to_GPU[rank]] |
| if rank == src: |
| tensors[0] = expected_tensor.cuda( |
| device=rank_to_GPU[rank][0]) |
| |
| dist.broadcast_multigpu(tensors, src, group_id) |
| for tensor in tensors: |
| self.assertEqual(tensor, expected_tensor) |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND != 'nccl', |
| "Only Nccl backend supports broadcast multigpu") |
| @skip_if_no_gpu |
| def test_broadcast_multigpu(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_broadcast_multigpu_helper(group, group_id, |
| rank, rank_to_GPU) |
| |
| def _test_all_reduce_multigpu_helper(self, group, group_id, rank, |
| rank_to_GPU, op, |
| master_value, worker_value, |
| expected_value): |
| for src in group: |
| if rank == src: |
| tensors = [_build_tensor(src + 1, master_value).cuda(device=i) |
| for i in rank_to_GPU[rank]] |
| else: |
| tensors = [_build_tensor(src + 1, worker_value).cuda(device=i) |
| for i in rank_to_GPU[rank]] |
| |
| dist.all_reduce_multigpu(tensors, op, group_id) |
| expected_tensor = _build_tensor(src + 1, expected_value) |
| for tensor in tensors: |
| self.assertEqual(tensor, expected_tensor) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND != 'nccl', |
| "Only Nccl backend supports allreduce multigpu") |
| @skip_if_no_gpu |
| def test_all_reduce_multigpu(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_all_reduce_multigpu_helper( |
| group, group_id, rank, rank_to_GPU, dist.reduce_op.SUM, |
| 2, 10, (2 + 10 * (len(group) - 1)) * len(rank_to_GPU[0])) |
| |
| def _test_reduce_multigpu_helper(self, group, group_id, rank, |
| rank_to_GPU, op, master_value, |
| worker_value, expected_value): |
| for src in group: |
| if rank == src: |
| tensors = [_build_tensor(src + 1, master_value).cuda(device=i) |
| for i in rank_to_GPU[rank]] |
| dist.reduce_multigpu(tensors, src, op, group_id) |
| expected_tensor = _build_tensor(src + 1, expected_value) |
| self.assertEqual(tensors[0], expected_tensor) |
| else: |
| tensors = [_build_tensor(src + 1, worker_value).cuda(device=i) |
| for i in rank_to_GPU[rank]] |
| dist.reduce_multigpu(tensors, src, op, group_id) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND != 'nccl', |
| "Only Nccl backend supports reduce multigpu") |
| @skip_if_no_gpu |
| def test_reduce_multigpu(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_reduce_multigpu_helper( |
| group, group_id, rank, rank_to_GPU, dist.reduce_op.SUM, |
| 2, 10, (2 + 10 * (len(group) - 1)) * len(rank_to_GPU[0])) |
| |
| def _test_all_gather_multigpu_helper(self, group, group_id, rank, |
| rank_to_GPU): |
| for dest in group: |
| tensors = [_build_tensor(dest + 1).cuda(device=i) |
| for i in rank_to_GPU[rank]] |
| |
| # construct expected output along with |
| # a place holder to receive all gather results |
| output_tensors = [] |
| expected_output = [] |
| output_per_gpu = [_build_tensor(dest + 1, -1)] * len(rank_to_GPU[0]) * len(group) |
| expected_per_gpu = [_build_tensor(dest + 1)] * len(rank_to_GPU[0]) * len(group) |
| for gpu in rank_to_GPU[rank]: |
| output_tensors.append([t.cuda(device=gpu) for t in output_per_gpu]) |
| expected_output.append([t.cuda(device=gpu) for t in expected_per_gpu]) |
| |
| dist.all_gather_multigpu(output_tensors, tensors, group_id) |
| self.assertEqual(output_tensors, expected_output) |
| |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND != 'nccl', |
| "Only Nccl backend supports allgather multigpu") |
| @skip_if_no_gpu |
| def test_all_gather_multigpu(self): |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| self._test_all_gather_multigpu_helper(group, group_id, rank, |
| rank_to_GPU) |
| |
| def _create_Net(self): |
| class Net(nn.Module): |
| def __init__(self): |
| super(Net, self).__init__() |
| self.fc1 = nn.Linear(2, 10, bias=False) |
| self.fc2 = nn.Linear(10, 50, bias=False) |
| self.fc3 = nn.Linear(50, 4, bias=False) |
| self.relu = nn.ReLU() |
| |
| def forward(self, x): |
| x = self.relu(self.fc1(x)) |
| x = self.relu(self.fc2(x)) |
| x = self.fc3(x) |
| return F.softmax(x, dim=1) |
| return Net() |
| |
| def _model_step(self, model): |
| for param in model.parameters(): |
| param.data += param.grad |
| param.grad = None |
| |
| def _prepare_dummy_data(self, local_bs): |
| # global_bs for DDP should be divisible by WORLD_SIZE |
| global_bs = int(WORLD_SIZE) * local_bs |
| input_cpu = torch.randn(global_bs, 2) |
| target = torch.randn(global_bs, 4) |
| loss = nn.MSELoss() |
| return global_bs, input_cpu, target, loss |
| |
| # END TO END TEST FOR DISTRIBUTEDDATAPARALLEL |
| def _test_DDP_helper(self, model, input_var, target, loss): |
| model.train() |
| output = model(input_var) |
| l = loss(output, target) |
| l.backward() |
| |
| def _assert_equal_param(self, param_gpu, param_DDP): |
| self.assertEqual(len(param_gpu), len(param_DDP)) |
| for p_gpu, p_DDP in zip(param_gpu, param_DDP): |
| self.assertEqual(p_gpu, p_DDP) |
| |
| def _test_DDP_2iter(self, model_base, model_DDP, input, target, loss, local_bs, rank, batch_size): |
| for i in range(2): |
| # single cpu/gpu training |
| self._test_DDP_helper(model_base, |
| input, |
| target, |
| loss) |
| |
| # DDP training, DDP scatters subsets of input_cpu to nodes/GPUs |
| self._test_DDP_helper(model_DDP, |
| input[rank * local_bs: (rank + 1) * local_bs], |
| target[rank * local_bs: (rank + 1) * local_bs], |
| loss) |
| |
| # Update weights and run a second iteration to shake out errors |
| self._model_step(model_base) |
| self._model_step(model_DDP) |
| self._assert_equal_param(list(model_base.parameters()), list(model_DDP.module.parameters())) |
| |
| # Shuffle the input so that DDP input is different |
| input = input[torch.randperm(batch_size)] |
| |
| @unittest.skipIf(BACKEND != 'nccl' and BACKEND != 'gloo', |
| "Only Nccl & Gloo backend support DistributedDataParallel") |
| @skip_if_no_cuda_distributed |
| @skip_if_no_gpu |
| def test_DistributedDataParallel(self): |
| # Run a simple end to end DDP model, use result of single node model |
| # as baseline |
| group, group_id, rank = self._init_global_test() |
| rank_to_GPU = self._init_multigpu_helper() |
| |
| # cpu training setup |
| model = self._create_Net() |
| |
| # single gpu training setup |
| model_gpu = copy.deepcopy(model) |
| gpu_subset = list(rank_to_GPU[rank]) |
| model_gpu.cuda(gpu_subset[0]) |
| |
| # DDP training setup |
| model_DDP = copy.deepcopy(model) |
| model_DDP.cuda(gpu_subset[0]) |
| model_DDP = nn.parallel.DistributedDataParallel(model_DDP, device_ids=gpu_subset) |
| |
| # dummy data initialization |
| local_bs = len(gpu_subset) |
| global_bs, input_cpu, target, loss = self._prepare_dummy_data(local_bs) |
| |
| # check two model parameters over 2 iterations |
| self._test_DDP_2iter(model_gpu, |
| model_DDP, |
| input_cpu.cuda(gpu_subset[0]), |
| target.cuda(gpu_subset[0]), |
| loss, |
| local_bs, |
| rank, |
| global_bs) |
| self._barrier() |
| |
| @unittest.skipIf(BACKEND == 'nccl', "nccl does not support DistributedDataParallelCPU") |
| def test_DistributedDataParallelCPU(self): |
| # Run a simple end to end DDP-CPU model, use result of single node |
| # model as baseline |
| group, group_id, rank = self._init_global_test() |
| |
| # cpu training setup |
| model_base = self._create_Net() |
| |
| # DDP-CPU training setup |
| model_DDP = copy.deepcopy(model_base) |
| model_DDP = nn.parallel.DistributedDataParallelCPU(model_DDP) |
| |
| # dummy data initialization |
| local_bs = 2 |
| global_bs, input_cpu, target, loss = self._prepare_dummy_data(local_bs) |
| |
| # check two model parameters over 2 iterations |
| self._test_DDP_2iter(model_base, |
| model_DDP, |
| input_cpu, |
| target, |
| loss, |
| local_bs, |
| rank, |
| global_bs) |
| self._barrier() |
| |
| |
| if BACKEND == 'tcp' or BACKEND == 'gloo' or BACKEND == 'nccl': |
| WORLD_SIZE = os.environ['WORLD_SIZE'] |
| |
| class TestDistBackend(TestCase, _DistTestBase): |
| |
| MANAGER_PROCESS_RANK = -1 |
| |
| @staticmethod |
| def manager_join(fn): |
| @wraps(fn) |
| def wrapper(self): |
| if self.rank == self.MANAGER_PROCESS_RANK: |
| self._join_and_reduce(fn) |
| else: |
| fn(self) |
| return wrapper |
| |
| @classmethod |
| def setUpClass(cls): |
| os.environ['MASTER_ADDR'] = MASTER_ADDR |
| os.environ['MASTER_PORT'] = MASTER_PORT |
| os.environ['WORLD_SIZE'] = WORLD_SIZE |
| for attr in dir(cls): |
| if attr.startswith('test'): |
| fn = getattr(cls, attr) |
| setattr(cls, attr, cls.manager_join(fn)) |
| |
| def setUp(self): |
| self.processes = [] |
| self.rank = self.MANAGER_PROCESS_RANK |
| Barrier.init() |
| for rank in range(int(WORLD_SIZE)): |
| self.processes.append(self._spawn_process(rank)) |
| |
| def tearDown(self): |
| for p in self.processes: |
| p.terminate() |
| |
| def _spawn_process(self, rank): |
| os.environ['RANK'] = str(rank) |
| name = 'process ' + str(rank) |
| process = multiprocessing.Process(target=self._run, name=name, |
| args=(rank,)) |
| process.start() |
| return process |
| |
| def _run(self, rank): |
| self.rank = rank |
| try: |
| dist.init_process_group(init_method=INIT_METHOD, |
| backend=BACKEND, |
| world_size=int(WORLD_SIZE)) |
| except RuntimeError as e: |
| if 'recompile' in e.args[0]: |
| sys.exit(0) |
| raise |
| # self.id() == e.g. '__main__.TestDistributed.test_get_rank' |
| # We're retreiving a corresponding test and executing it. |
| getattr(self, self.id().split(".")[2])() |
| sys.exit(0) |
| |
| def _join_and_reduce(self, fn): |
| skip_ok = getattr(fn, "skip_if_no_cuda_distributed", False) \ |
| or getattr(fn, "skip_if_no_gpu", False) \ |
| or getattr(fn, "skip_if_small_worldsize", False) |
| self.JOIN_TIMEOUT = get_timeout(self.id()) |
| for p in self.processes: |
| p.join(self.JOIN_TIMEOUT) |
| if not skip_ok: |
| self.assertEqual(p.exitcode, 0) |
| |
| if skip_ok: |
| first_process = self.processes[0] |
| # do this first so we don't give an error message about |
| # mismatched exit codes if the first isn't valid |
| assert first_process.exitcode == 0 \ |
| or first_process.exitcode == SKIP_IF_NO_CUDA_EXIT_CODE \ |
| or first_process.exitcode == SKIP_IF_NO_GPU_EXIT_CODE \ |
| or first_process.exitcode == SKIP_IF_SMALL_WORLDSIZE_EXIT_CODE |
| |
| for p in self.processes: |
| self.assertEqual(p.exitcode, first_process.exitcode) |
| if first_process.exitcode == SKIP_IF_NO_CUDA_EXIT_CODE: |
| raise unittest.SkipTest("cuda is not available") |
| if first_process.exitcode == SKIP_IF_NO_GPU_EXIT_CODE: |
| raise unittest.SkipTest("One unique gpu per process is not available") |
| if first_process.exitcode == SKIP_IF_SMALL_WORLDSIZE_EXIT_CODE: |
| raise unittest.SkipTest("worldsize is too small to run group tests") |
| |
| elif BACKEND == 'mpi': |
| WORLD_SIZE = os.environ['WORLD_SIZE'] |
| dist.init_process_group(init_method=INIT_METHOD, backend='mpi') |
| |
| class TestMPI(TestCase, _DistTestBase): |
| pass |
| |
| if __name__ == '__main__': |
| unittest.main() |
