# SPDX-License-Identifier: Apache-2.0
from __future__ import annotations

from typing import TYPE_CHECKING

import pytest

from ..utils import compare_two_settings, fork_new_process_for_each_test

if TYPE_CHECKING:
    from typing_extensions import LiteralString


@pytest.mark.parametrize("PP_SIZE, MODEL_NAME", [
    (2, "JackFram/llama-160m"),
])
@pytest.mark.parametrize("ATTN_BACKEND", [
    "FLASH_ATTN",
    "FLASHINFER",
])
@fork_new_process_for_each_test
def test_pp_cudagraph(
    monkeypatch: pytest.MonkeyPatch,
    PP_SIZE: int,
    MODEL_NAME: str,
    ATTN_BACKEND: LiteralString,
):
    with monkeypatch.context() as m:
        cudagraph_args = [
            # use half precision for speed and memory savings in CI environment
            "--dtype",
            "float16",
            "--pipeline-parallel-size",
            str(PP_SIZE),
            "--distributed-executor-backend",
            "mp",
        ]
        m.setenv("VLLM_ATTENTION_BACKEND", ATTN_BACKEND)

        eager_args = cudagraph_args + ["--enforce-eager"]

        compare_two_settings(MODEL_NAME, eager_args, cudagraph_args)