ColossalAI/tests/test_device/test_device_mesh.py

89 lines
3.0 KiB
Python

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