| |
| """Concurrent API correctness/load check for ds4-server session batching. |
| |
| Each case is submitted twice with the same non-zero seed. The pairs run in one |
| cold concurrent wave and must return identical output, even though prompt sizes |
| and output limits differ across cases. A fresh nonce avoids accidental reuse of |
| an earlier run's in-memory or disk checkpoint. |
| """ |
|
|
| import argparse |
| import concurrent.futures |
| import json |
| import math |
| import statistics |
| import sys |
| import threading |
| import time |
| import urllib.error |
| import urllib.request |
|
|
|
|
| CASES = ( |
| ("short-greedy", 0, 80, 0.0, 101), |
| ("medium-sampled", 384, 72, 0.7, 202), |
| ("long-greedy", 2304, 48, 0.0, 303), |
| ("short-sampled", 32, 96, 0.65, 404), |
| ("very-long-sampled", 3600, 32, 0.75, 505), |
| ("medium-greedy", 1024, 64, 0.0, 606), |
| ("long-sampled", 2048, 40, 0.7, 707), |
| ("tiny-sampled", 0, 96, 0.6, 808), |
| ) |
|
|
|
|
| def percentile(values, fraction): |
| ordered = sorted(values) |
| return ordered[max(0, math.ceil(len(ordered) * fraction) - 1)] |
|
|
|
|
| def make_payload(case, case_number, nonce, stream): |
| name, filler_words, max_tokens, temperature, seed = case |
| filler = (" alpha beta gamma delta" * ((filler_words + 3) // 4)) |
| filler = " ".join(filler.split()[:filler_words]) |
| prompt = ( |
| "This is batching test %s case %d (%s). Read the filler, then write " |
| "a concise explanation of why deterministic request isolation matters. " |
| "Do not quote the filler.\nFILLER:\n%s" |
| ) % (nonce, case_number, name, filler) |
| payload = { |
| "model": "deepseek-chat", |
| "messages": [{"role": "user", "content": prompt}], |
| "max_tokens": max_tokens, |
| "temperature": temperature, |
| "top_p": 0.9, |
| "seed": seed + case_number * 1000, |
| "stream": stream, |
| } |
| if stream: |
| payload["stream_options"] = {"include_usage": True} |
| return name, filler_words, payload |
|
|
|
|
| def parse_stream(raw): |
| content = [] |
| reasoning = [] |
| finish = None |
| usage = None |
| for line in raw.decode("utf-8", errors="replace").splitlines(): |
| if not line.startswith("data:"): |
| continue |
| data = line[5:].strip() |
| if not data or data == "[DONE]": |
| continue |
| event = json.loads(data) |
| if event.get("usage"): |
| usage = event["usage"] |
| choices = event.get("choices") or [] |
| if not choices: |
| continue |
| choice = choices[0] |
| delta = choice.get("delta") or {} |
| if delta.get("content") is not None: |
| content.append(delta["content"]) |
| if delta.get("reasoning_content") is not None: |
| reasoning.append(delta["reasoning_content"]) |
| if choice.get("finish_reason") is not None: |
| finish = choice["finish_reason"] |
| return { |
| "content": "".join(content), |
| "reasoning": "".join(reasoning), |
| "finish": finish, |
| "completion_tokens": (usage or {}).get("completion_tokens"), |
| } |
|
|
|
|
| def post_chat(url, payload, timeout, start_event): |
| start_event.wait() |
| body = json.dumps(payload, separators=(",", ":")).encode("utf-8") |
| req = urllib.request.Request( |
| url.rstrip("/") + "/v1/chat/completions", |
| data=body, |
| headers={"Content-Type": "application/json"}, |
| method="POST", |
| ) |
| started = time.monotonic() |
| try: |
| with urllib.request.urlopen(req, timeout=timeout) as response: |
| raw = response.read() |
| except urllib.error.HTTPError as exc: |
| detail = exc.read().decode("utf-8", errors="replace") |
| raise RuntimeError("HTTP %d: %s" % (exc.code, detail)) from exc |
| elapsed = time.monotonic() - started |
|
|
| if payload["stream"]: |
| result = parse_stream(raw) |
| else: |
| response = json.loads(raw) |
| choice = response["choices"][0] |
| message = choice.get("message") or {} |
| result = { |
| "content": message.get("content") or "", |
| "reasoning": message.get("reasoning_content") or "", |
| "finish": choice.get("finish_reason"), |
| "completion_tokens": (response.get("usage") or {}).get( |
| "completion_tokens" |
| ), |
| } |
| result["elapsed"] = elapsed |
| return result |
|
|
|
|
| def comparable(result): |
| return ( |
| result["content"], |
| result["reasoning"], |
| result["finish"], |
| result["completion_tokens"], |
| ) |
|
|
|
|
| def main(): |
| parser = argparse.ArgumentParser() |
| parser.add_argument("--url", default="http://127.0.0.1:8000") |
| parser.add_argument("--pairs", type=int, default=4) |
| parser.add_argument("--workers", type=int, default=0) |
| parser.add_argument("--timeout", type=float, default=1800.0) |
| parser.add_argument("--stream", action="store_true") |
| parser.add_argument("--nonce", default="") |
| parser.add_argument( |
| "--same-prompt", action="store_true", |
| help="send one identical prompt and seed in every request", |
| ) |
| parser.add_argument( |
| "--max-tokens", type=int, |
| help="override each case's completion limit", |
| ) |
| parser.add_argument( |
| "--case", choices=[case[0] for case in CASES], |
| help="repeat one case shape instead of cycling through mixed lengths", |
| ) |
| args = parser.parse_args() |
| if args.pairs <= 0: |
| parser.error("--pairs must be positive") |
|
|
| nonce = args.nonce or "cold-%d" % time.time_ns() |
| requests = [] |
| metadata = [] |
| for i in range(args.pairs): |
| case = next((c for c in CASES if c[0] == args.case), None) |
| if case is None: |
| case = CASES[i % len(CASES)] |
| case_number = 0 if args.same_prompt else i |
| name, filler_words, payload = make_payload( |
| case, case_number, nonce, args.stream |
| ) |
| if args.max_tokens is not None: |
| if args.max_tokens < 0: |
| parser.error("--max-tokens must be non-negative") |
| payload["max_tokens"] = args.max_tokens |
| for copy in range(2): |
| requests.append(payload) |
| metadata.append((i, copy, name, filler_words)) |
|
|
| workers = args.workers or len(requests) |
| workers = max(1, min(workers, len(requests))) |
| start_event = threading.Event() |
| wall_start = time.monotonic() |
| with concurrent.futures.ThreadPoolExecutor(max_workers=workers) as executor: |
| futures = [ |
| executor.submit(post_chat, args.url, payload, args.timeout, start_event) |
| for payload in requests |
| ] |
| start_event.set() |
| results = [future.result() for future in futures] |
| wall = time.monotonic() - wall_start |
|
|
| failures = 0 |
| for i in range(args.pairs): |
| a = results[2 * i] |
| b = results[2 * i + 1] |
| if comparable(a) != comparable(b): |
| failures += 1 |
| print("MISMATCH pair=%d case=%s" % (i, metadata[2 * i][2]), file=sys.stderr) |
| print(" A=%s" % (json.dumps(a, ensure_ascii=True)[:1000]), file=sys.stderr) |
| print(" B=%s" % (json.dumps(b, ensure_ascii=True)[:1000]), file=sys.stderr) |
| for label, result in (("A", a), ("B", b)): |
| matches = [ |
| index for index, candidate in enumerate(results) |
| if index not in (2 * i, 2 * i + 1) |
| and comparable(candidate) == comparable(result) |
| ] |
| if matches: |
| print( |
| " %s also returned by requests=%s" % (label, matches), |
| file=sys.stderr, |
| ) |
| if args.same_prompt: |
| mismatches = [ |
| index for index, result in enumerate(results[1:], start=1) |
| if comparable(result) != comparable(results[0]) |
| ] |
| if mismatches: |
| failures += 1 |
| print( |
| "MISMATCH identical prompt requests=%s" % mismatches, |
| file=sys.stderr, |
| ) |
|
|
| latencies = [result["elapsed"] for result in results] |
| known_tokens = [ |
| result["completion_tokens"] |
| for result in results |
| if result["completion_tokens"] is not None |
| ] |
| summary = { |
| "status": "PASS" if failures == 0 else "FAIL", |
| "pairs": args.pairs, |
| "requests": len(requests), |
| "workers": workers, |
| "stream": args.stream, |
| "wall_seconds": round(wall, 3), |
| "latency_p50_seconds": round(statistics.median(latencies), 3), |
| "latency_p95_seconds": round(percentile(latencies, 0.95), 3), |
| "completion_tokens": sum(known_tokens) if known_tokens else None, |
| "completion_tokens_per_second": ( |
| round(sum(known_tokens) / wall, 2) if known_tokens else None |
| ), |
| "nonce": nonce, |
| } |
| print(json.dumps(summary, sort_keys=True)) |
| return 0 if failures == 0 else 1 |
|
|
|
|
| if __name__ == "__main__": |
| raise SystemExit(main()) |
|
|
