72 lines
2.4 KiB
Python
72 lines
2.4 KiB
Python
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# SPDX-License-Identifier: Apache-2.0
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# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
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"""Cold start and warm start tests for vLLM-compile.
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Cold start runs in a forked child (must fork before CUDA init) which
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populates on-disk caches and asserts cold-start counters. Warm start
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then runs in the parent with clean in-memory state but populated caches.
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"""
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import multiprocessing as mp
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from torch._dynamo.utils import counters
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from vllm.compilation.counter import compilation_counter
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from vllm.config import CompilationConfig, CompilationMode, CUDAGraphMode
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MODEL = "microsoft/Phi-tiny-MoE-instruct"
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def _run_vllm(vllm_runner):
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with vllm_runner(
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MODEL,
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trust_remote_code=False,
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max_model_len=256,
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max_num_batched_tokens=1024,
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load_format="dummy",
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compilation_config=CompilationConfig(
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mode=CompilationMode.VLLM_COMPILE,
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cudagraph_mode=CUDAGraphMode.NONE,
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),
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num_gpu_blocks_override=8,
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):
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pass
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def _cold_start(vllm_runner):
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counters.clear()
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with compilation_counter.expect(
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num_compiled_artifacts_saved=3,
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num_compiled_artifacts_loaded=0,
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):
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_run_vllm(vllm_runner)
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assert counters["aot_autograd"]["total"] == 33
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assert counters["aot_autograd"]["autograd_cache_miss"] == 3
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assert counters["aot_autograd"]["autograd_cache_hit"] == 0
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def test_moe_startup(monkeypatch, vllm_runner, fresh_vllm_cache):
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monkeypatch.setenv("VLLM_ENABLE_V1_MULTIPROCESSING", "0")
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# Cold start in a forked child (must fork before CUDA init).
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# This model has 32 identical transformer layers which produce
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# 33 subgraphs after splitting on attention — only 3 are unique.
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ctx = mp.get_context("fork")
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p = ctx.Process(target=_cold_start, args=(vllm_runner,))
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p.start()
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p.join()
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assert p.exitcode == 0, "Cold-start child failed"
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# Warm start — compiled artifacts loaded from disk cache.
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counters.clear()
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with compilation_counter.expect(
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num_compiled_artifacts_loaded=3,
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# TODO: warm start should not save any artifacts
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# https://github.com/vllm-project/vllm/issues/35708
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num_compiled_artifacts_saved=1,
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):
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_run_vllm(vllm_runner)
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assert counters["aot_autograd"]["total"] == 30
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assert counters["aot_autograd"]["autograd_cache_miss"] == 0
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assert counters["aot_autograd"]["autograd_cache_hit"] == 1
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