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https://git.datalinker.icu/vllm-project/vllm.git
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8c1c81a3de
Signed-off-by: Amir Samani <asamani@nvidia.com> Signed-off-by: Michael Goin <mgoin64@gmail.com> Co-authored-by: Michael Goin <mgoin64@gmail.com>
95 lines
3.5 KiB
Python
95 lines
3.5 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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import random
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import typing
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import pytest
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import torch
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import torch.distributed as dist
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import torch.multiprocessing as mp
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import vllm.envs as envs
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from vllm.distributed import cleanup_dist_env_and_memory
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from vllm.distributed.device_communicators.cuda_communicator import (
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CudaCommunicator)
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from vllm.distributed.device_communicators.pynccl import (
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register_nccl_symmetric_ops)
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from vllm.distributed.device_communicators.pynccl_allocator import (
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get_nccl_mem_pool, is_symmetric_memory_enabled)
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from vllm.distributed.parallel_state import (get_tp_group,
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init_distributed_environment,
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initialize_model_parallel)
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from vllm.platforms import current_platform
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from vllm.utils import update_environment_variables
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torch.manual_seed(42)
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random.seed(44)
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test_size_elements = 4 * 1024 * 1024
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def nccl_symm_mem_allreduce_worker(local_rank: int, world_size: int):
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monkeypatch = pytest.MonkeyPatch()
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with monkeypatch.context() as m:
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m.delenv("CUDA_VISIBLE_DEVICES", raising=False)
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dtype = torch.bfloat16
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device = torch.device(f"cuda:{local_rank}")
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torch.cuda.set_device(device)
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torch.set_default_device(device)
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torch.set_default_dtype(dtype)
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update_environment_variables({
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"RANK": str(local_rank),
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"LOCAL_RANK": str(local_rank),
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"WORLD_SIZE": str(world_size),
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"MASTER_ADDR": "localhost",
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"MASTER_PORT": "12345",
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})
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init_distributed_environment()
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initialize_model_parallel(tensor_model_parallel_size=world_size)
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cuda_communicator = typing.cast(CudaCommunicator,
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get_tp_group().device_communicator)
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pynccl_comm = cuda_communicator.pynccl_comm
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if get_nccl_mem_pool() is None:
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pytest.skip("NCCL allocator compilation failed "
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"(probably missing NCCL headers).")
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if not is_symmetric_memory_enabled():
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pytest.skip("NCCL symmetric memory allreduce is disabled.")
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register_nccl_symmetric_ops(pynccl_comm)
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input = torch.randint(1,
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23, (test_size_elements, ),
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dtype=dtype,
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device=device)
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input_clone = input.clone()
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output = torch.ops.vllm.all_reduce_symmetric_with_copy(input)
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assert output is not None
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group = get_tp_group().device_group
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dist.all_reduce(input_clone, group=group)
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torch.testing.assert_close(output, input_clone, atol=2.5, rtol=0.1)
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@pytest.mark.skipif(
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not current_platform.is_cuda(),
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reason="NCCLSymmMemAllreduce is only available for CUDA platforms.",
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)
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@pytest.mark.parametrize("world_size", [2])
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@pytest.mark.skipif(envs.VLLM_TARGET_DEVICE not in ["cuda"],
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reason="Only test on CUDA")
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def test_nccl_symm_mem_allreduce(monkeypatch: pytest.MonkeyPatch, world_size):
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if world_size > torch.cuda.device_count():
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pytest.skip("Not enough GPUs to run the test.")
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# Enable SymmMemCommunicator
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monkeypatch.setenv("VLLM_USE_NCCL_SYMM_MEM", "1")
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monkeypatch.setenv("NCCL_NVLS_ENABLE", "1")
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monkeypatch.setenv("NCCL_CUMEM_ENABLE", "1")
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mp.spawn(nccl_symm_mem_allreduce_worker,
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args=(world_size, ),
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nprocs=world_size)
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cleanup_dist_env_and_memory()
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