File size: 3,012 Bytes
ee93ecd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | """Tests for GPU selection utilities."""
import os
import pytest
from mjlab.utils.gpu import select_gpus
@pytest.fixture(autouse=True)
def clean_cuda_env():
"""Clean CUDA_VISIBLE_DEVICES before each test."""
original = os.environ.get("CUDA_VISIBLE_DEVICES")
yield
# Restore original value after test.
if original is None:
os.environ.pop("CUDA_VISIBLE_DEVICES", None)
else:
os.environ["CUDA_VISIBLE_DEVICES"] = original
def test_select_gpus_with_visible_devices_set():
"""Respects CUDA_VISIBLE_DEVICES when selecting GPUs."""
os.environ["CUDA_VISIBLE_DEVICES"] = "0,1,2,3"
# Select first two GPUs (indices 0, 1 -> physical GPUs 0, 1).
selected, num = select_gpus([0, 1])
assert selected == [0, 1]
assert num == 2
def test_select_gpus_with_non_contiguous_devices():
"""Handles non-contiguous CUDA_VISIBLE_DEVICES correctly."""
os.environ["CUDA_VISIBLE_DEVICES"] = "1,3,5"
# Index 0 -> physical GPU 1.
selected, num = select_gpus([0])
assert selected == [1]
assert num == 1
# Index 1 -> physical GPU 3.
selected, num = select_gpus([1])
assert selected == [3]
assert num == 1
# Indices 0, 2 -> physical GPUs 1, 5.
selected, num = select_gpus([0, 2])
assert selected == [1, 5]
assert num == 2
def test_select_gpus_all_option():
"""Selects all GPUs when 'all' is specified."""
os.environ["CUDA_VISIBLE_DEVICES"] = "2,4,6"
selected, num = select_gpus("all")
assert selected == [2, 4, 6]
assert num == 3
def test_select_gpus_single_gpu():
"""Correctly selects a single GPU."""
os.environ["CUDA_VISIBLE_DEVICES"] = "0,1"
selected, num = select_gpus([0])
assert selected == [0]
assert num == 1
def test_select_gpus_with_spaces():
"""Handles CUDA_VISIBLE_DEVICES with spaces correctly."""
os.environ["CUDA_VISIBLE_DEVICES"] = " 0 , 1 , 2 "
selected, num = select_gpus([1, 2])
assert selected == [1, 2]
assert num == 2
def test_select_gpus_empty_segments():
"""Handles empty segments in CUDA_VISIBLE_DEVICES."""
# This can happen with malformed environment variables.
os.environ["CUDA_VISIBLE_DEVICES"] = "0,,2"
selected, num = select_gpus([0, 1])
assert selected == [0, 2]
assert num == 2
def test_select_gpus_respects_user_order():
"""Preserves the order specified by the user."""
os.environ["CUDA_VISIBLE_DEVICES"] = "0,1,2,3"
# User requests in reverse order.
selected, num = select_gpus([3, 2, 1, 0])
assert selected == [3, 2, 1, 0]
assert num == 4
def test_select_gpus_cpu_mode_explicit():
"""Selects CPU mode when None is specified."""
os.environ["CUDA_VISIBLE_DEVICES"] = "0,1"
selected, num = select_gpus(None)
assert selected is None
assert num == 0
def test_select_gpus_cpu_mode_empty_cuda_visible_devices():
"""Selects CPU mode when CUDA_VISIBLE_DEVICES is empty."""
os.environ["CUDA_VISIBLE_DEVICES"] = ""
# Should return CPU mode (None, 0) since no GPUs are visible.
selected, num = select_gpus([0])
assert selected is None
assert num == 0
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