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90 lines
3.0 KiB
90 lines
3.0 KiB
import pytest
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import torch
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import torch.distributed as dist
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import colossalai
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from colossalai.device.device_mesh import DeviceMesh
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from colossalai.testing import rerun_if_address_is_in_use, spawn
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def test_device_mesh():
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physical_mesh_id = torch.arange(0, 16)
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mesh_shape = (4, 4)
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# [[0, 1, 2, 3],
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# [4, 5, 6, 7],
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# [8, 9, 10,11],
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# [12,13,14,15]]
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device_mesh = DeviceMesh(physical_mesh_id, mesh_shape)
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assert device_mesh.global_rank_to_local_rank(5) == [1, 1]
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assert device_mesh.global_rank_to_local_rank(11) == [2, 3]
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assert device_mesh.get_ranks_in_process_group(axis=1, global_rank=2) == [0, 1, 2, 3]
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def check_1d_device_mesh():
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# check for 1D device mesh
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process_group = dist.GroupMember.WORLD
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device_mesh = DeviceMesh.from_process_group(process_group)
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# checks
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assert device_mesh.shape == [4]
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assert len(device_mesh.get_process_group_for_all_axes().keys()) == 1, "Expected 1 axis for the process group dict"
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assert device_mesh.get_process_group(axis=0) == process_group, "Expected world process group"
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assert device_mesh.is_initialized
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assert device_mesh.num_devices == 4
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assert device_mesh.is_initialized
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assert device_mesh.logical_mesh_id is None
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assert device_mesh._is_init_from_process_group
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def check_2d_device_mesh():
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# create process group for 2D device mesh
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first_row_ranks = [0, 1]
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second_row_ranks = [2, 3]
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first_col_ranks = [0, 2]
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second_col_ranks = [1, 3]
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first_row_pg = dist.new_group(first_row_ranks, backend="nccl")
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second_row_pg = dist.new_group(second_row_ranks, backend="nccl")
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first_col_pg = dist.new_group(first_col_ranks, backend="nccl")
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second_col_pg = dist.new_group(second_col_ranks, backend="nccl")
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# check for
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current_rank = dist.get_rank()
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if current_rank in first_row_ranks:
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row_pg = first_row_pg
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else:
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row_pg = second_row_pg
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if current_rank in first_col_ranks:
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col_pg = first_col_pg
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else:
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col_pg = second_col_pg
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device_mesh = DeviceMesh.from_process_group([col_pg, row_pg])
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# checks
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assert device_mesh.shape == [2, 2]
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assert len(device_mesh.get_process_group_for_all_axes().keys()) == 2, "Expected 2 axes for the process group dict"
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assert device_mesh.get_process_group(axis=0) == col_pg, "Expected column process group"
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assert device_mesh.get_process_group(axis=1) == row_pg, "Expected row process group"
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assert device_mesh.num_devices == 4
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assert device_mesh.is_initialized
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assert device_mesh.logical_mesh_id is None
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assert device_mesh._is_init_from_process_group
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def check_init_from_process_group(rank, world_size, port):
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colossalai.launch(rank=rank, world_size=world_size, host="localhost", port=port, backend="nccl")
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@pytest.mark.dist
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@rerun_if_address_is_in_use()
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def test_device_mesh_from_process_group():
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spawn(check_init_from_process_group, 4)
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if __name__ == "__main__":
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test_device_mesh()
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test_device_mesh_from_process_group()
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