ColossalAI/tests/test_tensor/test_dist_spec_mgr.py

67 lines
2.5 KiB
Python

import math
import torch
import torch.distributed as dist
import pytest
import colossalai
import torch.multiprocessing as mp
from colossalai.testing import rerun_if_address_is_in_use
from colossalai.utils import free_port
from colossalai.tensor import DistSpecManager, ProcessGroup, ShardSpec, ReplicaSpec
from functools import partial
def run():
group = ProcessGroup(tp_degree=dist.get_world_size())
rank = dist.get_rank()
size = dist.get_world_size()
depth = int(math.sqrt(size))
assert depth == math.sqrt(size)
x = torch.rand(8, 8).cuda()
old_dist_spec = ReplicaSpec()
row_spec = ShardSpec([0], [size])
col_spec = ShardSpec([-1], [size])
mat_spec = ShardSpec([0, 1], [depth, depth])
row_shard = DistSpecManager._shard_as(x, old_dist_spec, row_spec, group)
assert torch.equal(x.chunk(size, 0)[rank], row_shard)
assert torch.equal(x, DistSpecManager._gather(row_shard, row_spec, group))
col_shard = DistSpecManager._all_to_all(row_shard, row_spec, col_spec, group)
assert torch.equal(x.chunk(size, -1)[rank], col_shard)
assert torch.equal(x, DistSpecManager._gather(col_shard, col_spec, group))
mat_shard = DistSpecManager._shard_as(x, old_dist_spec, mat_spec, group)
assert torch.equal(x.chunk(depth, 0)[rank // depth].chunk(depth, 1)[rank % depth], mat_shard)
assert torch.equal(x, DistSpecManager._gather(mat_shard, mat_spec, group))
def check_mem():
pg = ProcessGroup(tp_degree=dist.get_world_size())
size = dist.get_world_size()
assert torch.cuda.memory_allocated() == 0
x = torch.rand(32, 32).cuda()
orig_mem = x.numel() * x.element_size()
assert torch.cuda.memory_allocated() == orig_mem
old_dist_spec = ReplicaSpec()
row_spec = ShardSpec([0], [size])
x.data = DistSpecManager._shard_as(x, old_dist_spec, row_spec, pg)
assert x.size(0) == 32 // size and x.size(1) == 32
assert torch.cuda.memory_allocated() == orig_mem // size
x.data = DistSpecManager._gather(x, row_spec, pg)
assert torch.cuda.memory_allocated() == orig_mem
def run_dist(rank, world_size, port):
colossalai.launch(config={}, rank=rank, world_size=world_size, host='localhost', port=port, backend='nccl')
check_mem()
run()
@pytest.mark.dist
@pytest.mark.parametrize('world_size', [1, 4])
@rerun_if_address_is_in_use()
def test_dist_spec_mgr(world_size):
run_func = partial(run_dist, world_size=world_size, port=free_port())
mp.spawn(run_func, nprocs=world_size)
if __name__ == '__main__':
test_dist_spec_mgr(4)