feat: 服务化基础设施 - 有界队列/超时/优雅关闭/metrics
- astrai/inference/scheduler.py: 有界队列 (max_queue_size) 拒绝满时入队抛 RuntimeError
-> 请求超时检测 (deadline + _abort_expired_tasks)，超时任务 abort 释放页并通知回调
-> stop() 改为 drain 模式：等待活跃任务自然结束再强制清理
-> get_stats() 扩展 latency P50/P95/P99 + cache hit rate
- astrai/inference/engine.py: generate/generate_async 新增 timeout 参数
-> _generate_streaming/_generate_non_streaming 捕获 add_task 异常并清理
- astrai/inference/server.py: 新增 /metrics 端点 (Prometheus 格式)
-> chat completions 端点捕获 RuntimeError 返回 503
-> configure_server 传递 max_queue_size/request_timeout
- astrai/inference/cache.py: 新增 lookup_hits/lookup_misses 计数器
- tests/: fix stats key total_tasks -> total_requests
This commit is contained in:
parent
3da428e0e4
commit
a3bde30fb1
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@ -61,6 +61,8 @@ class PagedCache:
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self._hash_to_page: Dict[int, int] = {}
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self._lru: List[int] = []
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self._pin: List[bool] = [False] * n_pages
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self.lookup_hits: int = 0
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self.lookup_misses: int = 0
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def _touch(self, idx: int) -> None:
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if self._refs[idx] == 0 and idx in self._lru:
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@ -98,7 +100,9 @@ class PagedCache:
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h = page_hash(token_ids, i, self.page_size)
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p = self._hash_to_page.get(h)
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if p is None:
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self.lookup_misses += 1
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break
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self.lookup_hits += 1
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self._touch(p)
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hits.append(p)
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return hits
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@ -195,6 +195,8 @@ class InferenceEngine:
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model: nn.Module,
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tokenizer: AutoTokenizer,
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max_batch_size: int = 1,
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max_queue_size: int = 64,
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request_timeout: float = 60.0,
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max_seq_len: Optional[int] = None,
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max_prompt_len: int = 2048,
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page_size: int = 128,
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@ -207,7 +209,6 @@ class InferenceEngine:
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max_batch_size: Maximum number of concurrent tasks.
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max_seq_len: Maximum sequence length.
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max_prompt_len: Maximum prompt tokens.
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compile: Whether to compile the model with torch.compile.
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page_size: Number of tokens per KV cache page.
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"""
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self.model = model
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@ -216,6 +217,8 @@ class InferenceEngine:
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model=self.model,
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tokenizer=self.tokenizer,
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max_batch_size=max_batch_size,
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max_queue_size=max_queue_size,
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request_timeout=request_timeout,
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max_seq_len=max_seq_len,
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max_prompt_len=max_prompt_len,
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page_size=page_size,
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@ -238,6 +241,7 @@ class InferenceEngine:
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temperature: float = 1.0,
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top_p: float = 1.0,
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top_k: int = 50,
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timeout: Optional[float] = None,
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) -> Union[Generator, str, List[str]]:
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"""Generates text from a prompt.
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@ -248,6 +252,7 @@ class InferenceEngine:
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temperature: Sampling temperature.
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top_p: Nucleus sampling probability threshold.
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top_k: Top-k sampling count (0 disables).
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timeout: Per-request timeout in seconds (None = use scheduler default).
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Returns:
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stream=False, single prompt: str
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@ -260,11 +265,11 @@ class InferenceEngine:
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if stream:
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return self._generate_streaming(
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prompts, is_batch, max_tokens, temperature, top_p, top_k
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prompts, is_batch, max_tokens, temperature, top_p, top_k, timeout
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)
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else:
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return self._generate_non_streaming(
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prompts, is_batch, max_tokens, temperature, top_p, top_k
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prompts, is_batch, max_tokens, temperature, top_p, top_k, timeout
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)
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def generate_async(
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@ -274,6 +279,7 @@ class InferenceEngine:
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temperature: float = 1.0,
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top_p: float = 1.0,
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top_k: int = 50,
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timeout: Optional[float] = None,
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) -> AsyncGenerator[str, None]:
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"""Async streaming generator that does not block the event loop.
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@ -286,12 +292,13 @@ class InferenceEngine:
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temperature: Sampling temperature.
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top_p: Nucleus sampling threshold.
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top_k: Top-k sampling count.
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timeout: Per-request timeout in seconds.
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Yields:
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Decoded token strings as they are generated.
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"""
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sync_gen = self._generate_streaming(
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[prompt], False, max_tokens, temperature, top_p, top_k
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[prompt], False, max_tokens, temperature, top_p, top_k, timeout
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)
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async def _agen():
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@ -350,6 +357,7 @@ class InferenceEngine:
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temperature: float,
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top_p: float,
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top_k: int,
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timeout: Optional[float] = None,
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) -> Generator:
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"""Internal streaming generator.
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@ -363,6 +371,7 @@ class InferenceEngine:
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temperature: Sampling temperature.
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top_p: Nucleus sampling threshold.
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top_k: Top-k sampling count.
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timeout: Per-request timeout in seconds.
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Yields:
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Single prompt: decoded token strings.
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@ -372,6 +381,7 @@ class InferenceEngine:
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result = _Result(count=n)
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task_ids = []
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try:
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for i, p in enumerate(prompts):
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task_id = self.scheduler.add_task(
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prompt=p,
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@ -380,8 +390,13 @@ class InferenceEngine:
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top_p=top_p,
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top_k=top_k,
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stream_callback=lambda tok, idx=i: result.append(tok, idx),
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timeout=timeout,
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)
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task_ids.append(task_id)
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except RuntimeError:
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for tid in task_ids:
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self.scheduler.remove_task(tid)
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raise
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remaining = n
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finished = [False] * n
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@ -415,6 +430,7 @@ class InferenceEngine:
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temperature: float,
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top_p: float,
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top_k: int,
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timeout: Optional[float] = None,
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) -> Union[str, List[str]]:
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"""Internal non-streaming generator.
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@ -427,6 +443,7 @@ class InferenceEngine:
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temperature: Sampling temperature.
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top_p: Nucleus sampling threshold.
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top_k: Top-k sampling count.
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timeout: Per-request timeout in seconds.
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Returns:
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Single string for one prompt, list of strings for batch.
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@ -434,6 +451,7 @@ class InferenceEngine:
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result = _Result(count=len(prompts))
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task_ids = []
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try:
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for i, p in enumerate(prompts):
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def make_cb(idx):
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@ -446,8 +464,13 @@ class InferenceEngine:
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top_p=top_p,
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top_k=top_k,
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stream_callback=make_cb(i),
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timeout=timeout,
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)
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task_ids.append(task_id)
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except RuntimeError:
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for tid in task_ids:
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self.scheduler.remove_task(tid)
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raise
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result.wait_completion()
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@ -55,6 +55,7 @@ class Task:
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self.n_pages: int = 0
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self._prefix_cached_tokens: int = 0
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self.arrival_time = time.time()
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self.deadline: float = 0.0
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self.finish_time: Optional[float] = None
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self.stream_callback = stream_callback
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self._pages_freed: bool = False
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@ -86,6 +87,8 @@ class InferenceScheduler:
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model: AutoModel,
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tokenizer: AutoTokenizer,
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max_batch_size: int = 16,
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max_queue_size: int = 64,
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request_timeout: float = 60.0,
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max_seq_len: Optional[int] = None,
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max_prompt_len: int = 512,
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page_size: int = 64,
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@ -97,6 +100,8 @@ class InferenceScheduler:
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self.model = model
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self.tokenizer = tokenizer
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self.max_batch_size = max_batch_size
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self.max_queue_size = max_queue_size
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self.request_timeout = request_timeout
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self.max_seq_len = max_seq_len or config.max_len
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self.max_prompt_len = max_prompt_len
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self.page_size = page_size
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@ -124,11 +129,16 @@ class InferenceScheduler:
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self.active_tasks: List[Task] = []
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self._running = False
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self._draining = False
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self._task_event = threading.Event()
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self._lock = threading.Lock()
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self._total_tasks = 0
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self._total_tokens = 0
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self._total_requests = 0
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self._total_rejected = 0
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self._total_timeouts = 0
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self._request_latencies: List[float] = []
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def _n_pages_for(self, n_tokens: int) -> int:
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return (n_tokens + self.page_size - 1) // self.page_size
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@ -141,6 +151,7 @@ class InferenceScheduler:
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top_p: float = 1.0,
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top_k: int = 50,
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stream_callback: Optional[Callable[[str], None]] = None,
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timeout: Optional[float] = None,
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) -> str:
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task_id = f"task_{int(time.time())}_{uuid.uuid4().hex[:8]}"
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prompt_ids = self.tokenizer.encode(prompt)
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@ -156,9 +167,16 @@ class InferenceScheduler:
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top_k=top_k,
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stream_callback=stream_callback,
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)
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task.deadline = time.time() + (
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timeout if timeout is not None else self.request_timeout
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)
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with self._lock:
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if len(self.waiting_queue) >= self.max_queue_size:
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self._total_rejected += 1
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raise RuntimeError("Request queue is full")
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self.waiting_queue.append(task)
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self._total_requests += 1
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self._total_tasks += 1
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self._task_event.set()
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@ -181,6 +199,40 @@ class InferenceScheduler:
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for idx in indices:
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self.page_cache.free(idx)
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def _abort_task(self, task: Task) -> None:
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task.status = TaskStatus.ABORTED
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task.finish_time = time.time()
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if not task._pages_freed:
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self._free_pages(task.page_table)
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task.page_table.clear()
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task.n_pages = 0
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task._pages_freed = True
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if task.stream_callback:
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task.stream_callback(STOP)
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def _abort_expired_tasks(self) -> None:
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now = time.time()
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alive = []
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for t in self.active_tasks:
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if now > t.deadline:
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self._abort_task(t)
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self._total_timeouts += 1
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else:
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alive.append(t)
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self.active_tasks = alive
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with self._lock:
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keep = []
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for t in self.waiting_queue:
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if now > t.deadline:
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t.status = TaskStatus.ABORTED
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if t.stream_callback:
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t.stream_callback(STOP)
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self._total_timeouts += 1
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else:
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keep.append(t)
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self.waiting_queue = keep
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def _record_page_hashes(self, task: Task, start_logical_page: int = 0) -> None:
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full_pages = len(task.prompt_ids) // self.page_size
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for i in range(start_logical_page, full_pages):
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@ -194,6 +246,9 @@ class InferenceScheduler:
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task.finish_time = time.time()
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finished.append(task)
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self._total_tokens += task.output_tokens
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self._request_latencies.append(task.finish_time - task.arrival_time)
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if len(self._request_latencies) > 1000:
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self._request_latencies.pop(0)
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for task in finished:
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if not task._pages_freed:
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@ -345,11 +400,16 @@ class InferenceScheduler:
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def _run_generation_loop(self) -> None:
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try:
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while self._running:
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while self._running or (self._draining and self.active_tasks):
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self._abort_expired_tasks()
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self._remove_finished_tasks()
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if not self._draining:
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self._refill_active_batch()
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if not self.active_tasks and not self.waiting_queue:
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if not self.active_tasks:
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if self._draining:
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break
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if not self.waiting_queue:
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self._task_event.clear()
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self._task_event.wait(timeout=1.0)
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continue
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@ -392,20 +452,54 @@ class InferenceScheduler:
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t.start()
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self._loop_thread = t
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def stop(self) -> None:
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def stop(self, timeout: float = 30.0) -> None:
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self._draining = True
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self._running = False
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self._task_event.set()
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if hasattr(self, "_loop_thread"):
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self._loop_thread.join(timeout=2.0)
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self._loop_thread.join(timeout=timeout)
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for task in self.active_tasks:
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if not task._pages_freed:
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self._free_pages(task.page_table)
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task._pages_freed = True
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if task.stream_callback:
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task.stream_callback(STOP)
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with self._lock:
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for task in self.waiting_queue:
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task.status = TaskStatus.ABORTED
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if task.stream_callback:
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task.stream_callback(STOP)
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self.waiting_queue.clear()
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self.active_tasks.clear()
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if torch.cuda.is_available():
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torch.cuda.empty_cache()
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def get_stats(self) -> Dict[str, Any]:
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latencies = self._request_latencies
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sorted_lat = sorted(latencies) if latencies else []
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n = len(sorted_lat)
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p50 = sorted_lat[n // 2] if n > 0 else 0.0
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p95 = sorted_lat[int(n * 0.95)] if n > 0 else 0.0
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p99 = sorted_lat[int(n * 0.99)] if n > 0 else 0.0
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cache = self.page_cache
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total_lookups = cache.lookup_hits + cache.lookup_misses
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hit_rate = cache.lookup_hits / total_lookups if total_lookups > 0 else 0.0
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return {
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"total_tasks": self._total_tasks,
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"total_requests": self._total_requests,
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"total_rejected": self._total_rejected,
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"total_timeouts": self._total_timeouts,
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"total_tokens": self._total_tokens,
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"active_tasks": len(self.active_tasks),
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"waiting_queue": len(self.waiting_queue),
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"latency_p50": p50,
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"latency_p95": p95,
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"latency_p99": p99,
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"cache_hit_rate": hit_rate,
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"cache_hits": cache.lookup_hits,
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"cache_misses": cache.lookup_misses,
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}
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@ -13,7 +13,7 @@ from typing import Any, Dict, List, Optional, Union
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import torch
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import uvicorn
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from fastapi import FastAPI, HTTPException
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from fastapi.responses import StreamingResponse
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from fastapi.responses import PlainTextResponse, StreamingResponse
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from pydantic import BaseModel, Field
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from astrai.inference.engine import InferenceEngine
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@ -92,6 +92,8 @@ def configure_server(
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dtype=dtype,
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param_path=param_path,
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max_batch_size=max_batch_size,
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max_queue_size=64,
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request_timeout=60.0,
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)
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@ -185,6 +187,40 @@ async def get_stats():
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return _get_engine().get_stats()
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@app.get("/metrics")
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async def metrics():
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s = _get_engine().get_stats()
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lines = [
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"# HELP astrai_requests_total Total requests received",
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"# TYPE astrai_requests_total counter",
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f'astrai_requests_total{{status="accepted"}} {s["total_requests"]}',
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f'astrai_requests_total{{status="rejected"}} {s["total_rejected"]}',
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f'astrai_requests_total{{status="timeout"}} {s["total_timeouts"]}',
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"# HELP astrai_tokens_generated Total generated tokens",
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"# TYPE astrai_tokens_generated counter",
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f"astrai_tokens_generated {s['total_tokens']}",
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"# HELP astrai_active_tasks Currently active tasks",
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"# TYPE astrai_active_tasks gauge",
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f"astrai_active_tasks {s['active_tasks']}",
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"# HELP astrai_queue_depth Waiting queue depth",
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"# TYPE astrai_queue_depth gauge",
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f"astrai_queue_depth {s['waiting_queue']}",
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"# HELP astrai_request_latency_seconds Request latency quantiles",
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"# TYPE astrai_request_latency_seconds gauge",
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f'astrai_request_latency_seconds{{quantile="0.5"}} {s["latency_p50"]:.3f}',
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f'astrai_request_latency_seconds{{quantile="0.95"}} {s["latency_p95"]:.3f}',
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f'astrai_request_latency_seconds{{quantile="0.99"}} {s["latency_p99"]:.3f}',
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"# HELP astrai_cache_hit_rate Prefix cache hit ratio",
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"# TYPE astrai_cache_hit_rate gauge",
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f"astrai_cache_hit_rate {s['cache_hit_rate']:.3f}",
|
||||
"# HELP astrai_cache_lookups_total Prefix cache page lookups",
|
||||
"# TYPE astrai_cache_lookups_total counter",
|
||||
f'astrai_cache_lookups_total{{result="hit"}} {s["cache_hits"]}',
|
||||
f'astrai_cache_lookups_total{{result="miss"}} {s["cache_misses"]}',
|
||||
]
|
||||
return PlainTextResponse("\n".join(lines) + "\n")
|
||||
|
||||
|
||||
@app.post("/v1/chat/completions")
|
||||
async def chat_completion(request: ChatCompletionRequest):
|
||||
"""OpenAI-compatible chat completion endpoint (streaming + non-streaming)."""
|
||||
|
|
@ -200,6 +236,7 @@ async def chat_completion(request: ChatCompletionRequest):
|
|||
prompt_tokens = len(engine.tokenizer.encode(prompt))
|
||||
|
||||
if request.stream:
|
||||
try:
|
||||
agen = engine.generate_async(
|
||||
prompt=prompt,
|
||||
max_tokens=request.max_tokens,
|
||||
|
|
@ -207,6 +244,8 @@ async def chat_completion(request: ChatCompletionRequest):
|
|||
top_p=request.top_p,
|
||||
top_k=request.top_k,
|
||||
)
|
||||
except RuntimeError as e:
|
||||
raise HTTPException(status_code=503, detail=str(e))
|
||||
|
||||
async def event_stream():
|
||||
yield _make_chunk(
|
||||
|
|
@ -252,6 +291,7 @@ async def chat_completion(request: ChatCompletionRequest):
|
|||
|
||||
completion_tokens = 0
|
||||
chunks: List[str] = []
|
||||
try:
|
||||
agen = engine.generate_async(
|
||||
prompt=prompt,
|
||||
max_tokens=request.max_tokens,
|
||||
|
|
@ -259,6 +299,8 @@ async def chat_completion(request: ChatCompletionRequest):
|
|||
top_p=request.top_p,
|
||||
top_k=request.top_k,
|
||||
)
|
||||
except RuntimeError as e:
|
||||
raise HTTPException(status_code=503, detail=str(e))
|
||||
async for token in agen:
|
||||
chunks.append(token)
|
||||
completion_tokens += 1
|
||||
|
|
|
|||
|
|
@ -173,5 +173,5 @@ def test_scheduler_concurrent_get_stats(mock_model_and_tokenizer):
|
|||
|
||||
# Verify stats are consistent
|
||||
for stats in results["stats"]:
|
||||
assert "total_tasks" in stats
|
||||
assert stats["total_tasks"] >= 0
|
||||
assert "total_requests" in stats
|
||||
assert stats["total_requests"] >= 0
|
||||
|
|
|
|||
Loading…
Reference in New Issue