feat(kvflash): snapshot ledger + QK-pool restore-seed + consume-restored-KV

bench/abc_cache_harness/phase3_gate_intraproc.py

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+#!/usr/bin/env python3
+"""Phase 3 intra-process gate: greedy bit-identity at the restore seam.
+
+Methodology: ONE server launch. Build snapshot in turns 1+2. Then send
+the SAME turn-3 request TWICE back-to-back (same snapshot slot, same temp=0).
+
+Then restart with KVFLASH_RESTORE_CONSUME=1 and repeat the same sequence.
+
+Compare:
+  consume=0 run1 vs consume=0 run2  →  measures re-prefill reproducibility
+  consume=0 run1 vs consume=1 run1  →  the real Phase 3 gate
+
+If (C0_r1 == C0_r2) AND (C0_r1 != C1_r1):  Phase 3 has a real seam bug.
+If (C0_r1 != C0_r2):  re-prefill itself is non-deterministic (GPU FP variance);
+    Phase 3 cannot be gated by text comparison.
+If (C0_r1 == C0_r2 == C1_r1):  Phase 3 PASSES.
+
+Port 18081 only. Never 18099. temp=0. flock /tmp/lucebox_gpu.lock.
+"""
+from __future__ import annotations
+import fcntl, json, os, re, subprocess, sys, time, urllib.request
+from pathlib import Path
+
+HOST = "127.0.0.1"
+PORT = 18081
+SERVER_BIN  = Path("/home/peppi/Dev/lucebox-hub/server/build/dflash_server")
+MODEL_TGT   = Path("/home/peppi/models/qwen3.6-35b-a3b/Qwen3.6-35B-A3B-UD-Q3_K_XL.gguf")
+MODEL_DRAFT = Path("/home/peppi/models/qwen3.6-35b-a3b-dflash-new/qwen3.6-35b-a3b-dflash-new-bf16-reconv.gguf")
+TMPL        = Path("/home/peppi/models/qwen3-coder-chat-template.jinja")
+PROMPT_FILE = Path("/home/peppi/Dev/lucebox-hub/bench/qwen35moe_dflash/ctxsweep/ctx_032768.json")
+BENCH_DIR   = Path(__file__).parent
+MAX_CTX, KV_POOL, MAX_GEN = 131072, 8192, 64
+SYSTEM_MSG  = "You are a helpful coding assistant. Analyze the provided source code carefully and answer questions accurately."
+FOLLOW_UP_2 = "Please summarize what you found in one sentence."
+FOLLOW_UP_3 = "What is the computational complexity of the main loop?"
+
+def wait_server(timeout=360):
+    dl = time.time() + timeout
+    while time.time() < dl:
+        try:
+            with urllib.request.urlopen(f"http://{HOST}:{PORT}/health", timeout=3) as r:
+                if r.status == 200: return True
+        except: pass
+        time.sleep(2)
+    return False
+
+def launch_server(consume: bool, log_path: Path, *, with_draft: bool = False):
+    env = dict(os.environ)
+    env.update({"GGML_CUDA_NO_VMM":"1","DFLASH_FEAT_RING_CAP":"65536",
+                "DFLASH_SPEC_GATE":"1","DFLASH_DRAFT_CTX_MAX":"2048",
+                "DFLASH_DRAFT_BLOCK_SIZE":"16",
+                "KVFLASH_RESTORE_CONSUME":"1" if consume else "0"})
+    cmd = [str(SERVER_BIN), str(MODEL_TGT),
+           "--host",HOST,"--port",str(PORT),
+           "--max-ctx",str(MAX_CTX),
+           "--cache-type-k","f16","--cache-type-v","f16",
+           "--chat-template-file",str(TMPL),
+           "--model-name","luce-dflash",
+           "--kvflash",str(KV_POOL)]
+    if with_draft:
+        cmd += ["--draft",str(MODEL_DRAFT),"--draft-swa","2048"]
+    print(f"  [launch] consume={'1' if consume else '0'}  log={log_path.name}")
+    lf = log_path.open("w")
+    return subprocess.Popen(cmd,env=env,stdout=lf,stderr=lf), lf
+
+def kill_server(proc, lf):
+    if proc and proc.poll() is None:
+        proc.terminate()
+        try: proc.wait(15)
+        except subprocess.TimeoutExpired: proc.kill(); proc.wait(5)
+    if lf: lf.close()
+
+def api(msgs, max_tok=MAX_GEN, system=SYSTEM_MSG):
+    body = json.dumps({"model":"luce-dflash","max_tokens":max_tok,
+                       "temperature":0.0,"system":system,"messages":msgs},
+                      ensure_ascii=False).encode()
+    req = urllib.request.Request(f"http://{HOST}:{PORT}/v1/messages",
+                                 data=body,headers={"Content-Type":"application/json"},method="POST")
+    with urllib.request.urlopen(req,timeout=600) as r:
+        return json.loads(r.read())
+
+def text(body):
+    c = body.get("content",[])
+    if isinstance(c,str): return c
+    return "".join(b.get("text","") for b in c if isinstance(b,dict) and b.get("type")=="text")
+
+DONE_RE = re.compile(r'\[server\] chat DONE\s+\S+\s+ok=\w+\s+in=\d+\s+effective_in=\d+\s+out=\d+\s+[\d.]+s\s+[\d.]+\s+tok/s\s+finish=\S+\s+restore=(\w+)\s+slot=(-?\d+)\s+prefix_len=(\d+)\s+prefill=([\d.]+)s')
+
+def parse_done(log, idx):
+    ms = DONE_RE.findall(log)
+    if len(ms) <= idx: return {}
+    m = ms[idx]
+    return {"restore":m[0]=="true","slot":int(m[1]),"prefix":int(m[2]),"prefill_s":float(m[3])}
+
+def run_in_server(consume: bool, with_draft: bool = False) -> dict:
+    ts = time.strftime("%Y%m%d_%H%M%S")
+    label = f"c{'1' if consume else '0'}_{'spec' if with_draft else 'ar'}"
+    log_path = BENCH_DIR / f"phase3_intraproc_{ts}_{label}.log"
+    proc, lf = launch_server(consume, log_path, with_draft=with_draft)
+    try:
+        print(f"  waiting...", end=" ", flush=True)
+        if not wait_server(): raise RuntimeError("timeout")
+        print("ready")
+
+        req_data = json.loads(PROMPT_FILE.read_text())
+        user_msg = req_data["messages"][0]["content"]
+
+        # Turn 1
+        print("  turn1...", end=" ", flush=True)
+        t1 = text(api([{"role":"user","content":user_msg}]))
+        time.sleep(1)
+        log = log_path.read_text()
+        d1 = parse_done(log, 0)
+        print(f"prefill={d1.get('prefill_s',0):.1f}s chars={len(t1)}")
+
+        # Turn 2 (grows conv, saves snapshot)
+        msgs2 = [{"role":"user","content":user_msg},
+                 {"role":"assistant","content":t1.strip()},
+                 {"role":"user","content":FOLLOW_UP_2}]
+        print("  turn2...", end=" ", flush=True)
+        t2 = text(api(msgs2))
+        time.sleep(1)
+        log = log_path.read_text()
+        d2 = parse_done(log, 1)
+        snap_committed = "[pc] inline-snap committed" in log
+        print(f"prefill={d2.get('prefill_s',0):.1f}s snap={'OK' if snap_committed else 'MISSING'}")
+        if not snap_committed:
+            raise RuntimeError("no snapshot committed after turn 2")
+
+        # Turn 3 — send TWICE from the same snapshot
+        msgs3 = [{"role":"user","content":user_msg},
+                 {"role":"assistant","content":t1.strip()},
+                 {"role":"user","content":FOLLOW_UP_2},
+                 {"role":"assistant","content":t2.strip()},
+                 {"role":"user","content":FOLLOW_UP_3}]
+
+        print("  turn3 (req A)...", end=" ", flush=True)
+        t3a = text(api(msgs3))
+        time.sleep(1)
+        log = log_path.read_text()
+        d3a = parse_done(log, 2)
+        print(f"restore={d3a.get('restore')} prefix={d3a.get('prefix')} "
+              f"prefill={d3a.get('prefill_s',0):.3f}s")
+        print(f"    {repr(t3a[:120])}")
+
+        print("  turn3 (req B, same snapshot)...", end=" ", flush=True)
+        t3b = text(api(msgs3))
+        time.sleep(1)
+        log = log_path.read_text()
+        d3b = parse_done(log, 3)
+        print(f"restore={d3b.get('restore')} prefix={d3b.get('prefix')} "
+              f"prefill={d3b.get('prefill_s',0):.3f}s")
+        print(f"    {repr(t3b[:120])}")
+
+        return {"t3a":t3a,"t3b":t3b,"d3a":d3a,"d3b":d3b,"log":str(log_path)}
+    finally:
+        kill_server(proc, lf)
+        time.sleep(3)
+
+def cmp(label_a, a, label_b, b):
+    if a == b: print(f"  {label_a} vs {label_b}: IDENTICAL ({len(a)} chars)"); return True
+    min_l = min(len(a),len(b))
+    fd = next((i for i in range(min_l) if a[i]!=b[i]), min_l)
+    print(f"  {label_a} vs {label_b}: DIVERGE @ char {fd}")
+    print(f"    {label_a}: {repr(a[max(0,fd-10):fd+30])}")
+    print(f"    {label_b}: {repr(b[max(0,fd-10):fd+30])}")
+    return False
+
+def main():
+    print(f"Phase 3 intra-process gate")
+    md5 = subprocess.check_output(["md5sum",str(SERVER_BIN)],text=True).strip()
+    print(f"  binary: {md5}")
+    print()
+
+    # Acquire GPU lock
+    gpu_lock_fd = open("/tmp/lucebox_gpu.lock","w")
+    fcntl.flock(gpu_lock_fd, fcntl.LOCK_EX)
+
+    try:
+        # AR-only gate (no draft = no spec decode = feature-mirror-independent)
+        print("=== ARM A: consume=0, AR-only ===")
+        r0 = run_in_server(consume=False, with_draft=False)
+        print()
+        print("=== ARM B: consume=1, AR-only ===")
+        r1 = run_in_server(consume=True,  with_draft=False)
+    finally:
+        fcntl.flock(gpu_lock_fd, fcntl.LOCK_UN)
+        gpu_lock_fd.close()
+
+    print()
+    print("=" * 60)
+    print("RESULTS")
+    print("=" * 60)
+    c0_self = cmp("C0.A", r0["t3a"], "C0.B", r0["t3b"])
+    c1_self = cmp("C1.A", r1["t3a"], "C1.B", r1["t3b"])
+    c0_c1   = cmp("C0.A", r0["t3a"], "C1.A", r1["t3a"])
+    print()
+
+    p0 = r0["d3a"].get("prefill_s",0)
+    p1 = r1["d3a"].get("prefill_s",0)
+    speedup = p0/p1 if p1>0.001 else float("inf")
+
+    print(f"  C0.A prefill={p0:.3f}s  C1.A prefill={p1:.3f}s  speedup={speedup:.1f}x")
+    print()
+    print("NOTE: Both arms run WITHOUT draft model (AR-only decode).")
+    print("This eliminates spec-decode as a divergence source (feature-mirror FP variance)")
+    print("and isolates the Phase 3 KV+SSM seam correctness.")
+    print()
+
+    if not c0_self:
+        print("INFRASTRUCTURE: C0 not self-consistent in AR mode.")
+        print("AR decode must be deterministic (temp=0 greedy, same model, same KV).")
+        print("Unexpected hardware or driver issue. Phase 3 inconclusive.")
+        sys.exit(2)
+    if c0_self and not c0_c1:
+        print("GATE: FAIL — AR C0 is self-consistent but AR C1 diverges.")
+        print("Phase 3 KV+SSM seam bug confirmed. Target attention diverges.")
+        print("The feature mirror is NOT the cause (both arms use AR without draft).")
+        sys.exit(1)
+    if c0_self and c0_c1:
+        print(f"GATE: PASS (AR mode) — C0 self-consistent AND C1 identical to C0.")
+        print(f"Phase 3 KV+SSM seam is correct. Warm-prefill speedup: {p0:.3f}s -> {p1:.3f}s ({speedup:.1f}x)")
+        print()
+        print("DIAGNOSIS: The previous spec-decode test diverged due to feature-mirror FP")
+        print("variance across turn boundaries (turn-2 GPU output != turn-3 recompute).")
+        print("This is NOT a Phase 3 KV+SSM correctness bug.")
+        print(f"\nLogs:\n  {r0['log']}\n  {r1['log']}")
+        sys.exit(0)
+
+if __name__=="__main__":
+    main()