test_config.py

# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
import pytest

import vllm
from vllm.compilation.counter import compilation_counter
from vllm.config import VllmConfig
from vllm.utils import _is_torch_equal_or_newer


def test_version():
    assert _is_torch_equal_or_newer('2.8.0.dev20250624+cu128', '2.8.0.dev')
    assert _is_torch_equal_or_newer('2.8.0a0+gitc82a174', '2.8.0.dev')
    assert _is_torch_equal_or_newer('2.8.0', '2.8.0.dev')
    assert _is_torch_equal_or_newer('2.8.1', '2.8.0.dev')
    assert not _is_torch_equal_or_newer('2.7.1', '2.8.0.dev')


def test_use_cudagraphs_dynamic(monkeypatch):
    assert vllm.envs.VLLM_USE_V1
    vllm_config = VllmConfig()
    assert vllm_config.compilation_config.use_cudagraph

    monkeypatch.setenv('VLLM_USE_V1', '0')
    vllm_config = VllmConfig()
    assert not vllm_config.compilation_config.use_cudagraph


@pytest.mark.parametrize("enabled", [True, False])
def test_use_cudagraphs(vllm_runner, monkeypatch, enabled):
    assert vllm.envs.VLLM_USE_V1

    # Disable multiprocessing so that the counter is in the same process
    monkeypatch.setenv('VLLM_ENABLE_V1_MULTIPROCESSING', '0')

    compilation_config = {
        "cudagraph_capture_sizes": [100],
        "use_cudagraph": enabled,
    }
    with (
            compilation_counter.expect(
                num_graphs_seen=1,
                num_gpu_runner_capture_triggers=1 if enabled else 0,
                num_cudagraph_captured=13 if enabled else 0,
            ),
            # loading the model causes compilation (if enabled) to happen
            vllm_runner('facebook/opt-125m',
                        compilation_config=compilation_config,
                        gpu_memory_utilization=0.4) as _):
        pass