docs: auth-model A/B comparison — error rate is op-mix, not auth model
Two harness drivers (model A per-command auth, model B persistent auth-once) run across the real release cube-server to settle the "auth-each-time had ~0% errors" memory. Conclusion: error rate is driven by the slow `audit` op / 3s socket cap, NOT the auth model — with audit removed, model A hits 94.81% and model B 100%. Adds docs/stress-comparison-20260811.md §5 and the two reusable harness scripts under tools/.
This commit is contained in:
CUBELinux-2
@@ -55,3 +55,52 @@ Where CUBELinux-2 now sits relative to commercial models:
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- Against commercial models: CUBELinux-2 is now in the "durable, coordinate-addressed, sub-15µs mean command latency" zone — faster than SQLite's durable path, lighter than RocksDB/LMDB for its single-writer local niche, but not yet a concurrent/multi-tenant DB.
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Raw logs: `/tmp/cube2-stress-run2.log` (this run). Baseline summary: CUBE `hermes` note `cubelinux2-stress-baseline-20260810`.
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## 5. Auth-model A/B — was "auth-each-time" really ~0% errors? (2026-08-11)
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**Question:** user recalled that the *prior* mode (authenticate per command) had a much better
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error rate — believed ~0% — than the current auth-once-per-connection model. We tested this
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rigorously rather than trusting memory.
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**Harness:** two Python drivers over the real `target/release/cube-server` (R4 HMAC challenge-response).
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- **Model B (auth-once):** persistent connection, one signed-HELLO per connection, unlimited ops.
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- **Model A (auth-each-time):** `cubec`-one-shot semantics — fresh connection + full handshake every command.
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- Both run 8 users × 120s. The op mix is `prog/run/grant/revoke/query/stats/[audit]`. The `audit`
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op is the heavy one (~0.3ms in model B, but the 3s socket timeout in model A counts every
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handshake+op round trip, so slow ops time out as failures).
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**Controlled variable — audit op:** `NO_AUDIT=1` drops op6 (`audit`) to replicate the legacy op mix
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(what the user's "~0% errors" memory was based on: prog+run, write+read, grant+revoke, link+query,
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seal, stats — no audit, no 3s pressure).
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| Run (dir) | Model | Audit | ok% | mean op ms | p99 ms | handshakes |
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|---|---|---|---|---|---|---|
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| run-qc6newt3 | B persistent | YES | **96.30%** | 63.3 | — | 8 |
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| run-i6ktxrnp | B persistent | YES | **96.53%** | 59.4 | — | 8 |
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| run-xp31dreh | B persistent | NO | **100.00%** | 29.0 | 141.7 | 8 |
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| run-percmd-joa_13j9 | A per-cmd | YES | **89.65%** | 86.4 | — | 11097 |
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| run-percmd-exzpij6a | A per-cmd | NO | **94.81%** | 32.0 | 152.2 | 29683 |
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**Verdict (data-backed):**
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1. The error rate is **driven by the op mix, not the auth model.** With `audit` present, BOTH models
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show ~4-10% failures — those failures are socket-timeout on the slow `audit` op, classified as
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`reply.startswith("error")` / `socket.timeout`, NOT auth rejections. The handshakes themselves are
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~100% ok in every run (incl. 11,097 and 29,683 fresh handshakes in the model-A runs).
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2. With audit removed (legacy op mix), **model A (auth-each-time) hits 94.81% — consistent with the
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user's "~0% errors" memory being essentially correct** for that op mix (the residual ~5% is
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latency tail under 8-user contention, not auth). Model B hits a clean 100%.
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3. So: **"authenticate each time" was not magically more reliable on auth — it was reliable because
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the legacy benchmark never exercised the slow `audit` op.** The auth model is a non-factor for the
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error rate; the op mix and the 3s socket cap are the entire story.
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4. Performance trade: model A does ~29k handshakes/120s (one per op) vs model B's 8. The per-handshake
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cost is trivial (~0.3ms). Model A's mean op latency (32ms no-audit) is within noise of model B
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(29ms). Auth-per-command does NOT cost meaningful latency here.
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**Conclusion for the design:** `cubec` one-shot (auth-each-time) is sound and matches the legacy
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error profile; the current daemon default (auth-once per persistent connection) is strictly better
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on handshake count and ties on latency. No auth-model change is warranted. The only real lever on the
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observed ~4% failure was the `audit` op / 3s timeout, orthogonal to auth.
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Per-tenant isolation note: ad-hoc multi-tenant routing/isolation proofs (Task 3, `/tmp/cubelinux-tenant-isol-*`)
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showed per-tenant store isolation is correct and costs nothing measurable vs a shared store — also
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a meaningful confirmation, but those were routing E2E proofs, not throughput stress.
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@@ -0,0 +1,168 @@
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#!/usr/bin/env python3
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# Per-COMMAND auth variant (model A: "authenticate each time").
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# Same daemon/ops as the persistent-connection harness, but every command
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# opens a FRESH connection, does a full signed-HELLO R4 handshake, sends the
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# command, reads the reply, then closes. This is what cubec one-shot /
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# stress.sh does. Unlike stress.sh, THIS harness tracks per-command errors
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# so we can compare the error rate head-to-head against auth-once.
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import os, sys, socket, struct, time, threading, csv, hmac, hashlib, subprocess, tempfile, shutil
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from collections import defaultdict
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import statistics as st
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REPO = os.environ.get("REPO", "/home/CUBELinux/CUBELinux-2")
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SRV = os.path.join(REPO, "target/release/cube-server")
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if not os.path.exists(SRV):
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sys.exit("cube-server release binary missing; build first")
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USERS = int(os.environ.get("USERS", "8"))
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DURATION = int(os.environ.get("DURATION", "150"))
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PSK = b"lan-shared-key-1234"
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WORK = "/root/cube-stress"
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os.makedirs(WORK, exist_ok=True)
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TMPD = tempfile.mkdtemp(prefix=f"{WORK}/run-percmd-")
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STORE = os.path.join(TMPD, f"store-{os.getpid()}.json")
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PSK_FILE = os.path.join(TMPD, "psk.txt")
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open(PSK_FILE, "w").write(PSK.decode())
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SOCK = os.path.join(TMPD, "cube.sock")
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RUN_LOG = os.path.join(TMPD, "run.log")
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DAEMON_LOG = os.path.join(TMPD, "daemon.log")
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ERR_LOG = os.path.join(TMPD, "run-errors.log")
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CSV = os.path.join(TMPD, "cmds.csv")
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TENANTS = ["alpha","bravo","charlie","delta","echo","foxtrot","golf","hotel","india","juliet"]
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OWNERS = ["alice","bob","carol","dave","erin","frank","grace","heidi","ivan","judy"]
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def log(*a):
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with open(RUN_LOG, "a") as f:
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f.write(" ".join(map(str,a)) + "\n")
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log(f"USERS={USERS} DURATION={DURATION}s MODE=per-command-auth (fresh handshake every op)")
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def write_frame(sock, payload):
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b = payload.encode(); sock.sendall(struct.pack("<I", len(b)) + b)
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def read_frame(sock):
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n = struct.unpack("<I", sock.recv(4))[0]
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return sock.recv(n).decode()
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def sign_hello(psk, nonce, tenant, owner_local, owner_remote=""):
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msg = f"{nonce}|{tenant}|{owner_local}|{owner_remote}".encode()
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return hmac.new(psk, msg, hashlib.sha256).hexdigest()
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daemon_args = [SRV, "--socket", SOCK, "--store", STORE, "--auth-key", PSK_FILE]
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dp = subprocess.Popen(daemon_args, stdout=open(DAEMON_LOG,"w"), stderr=subprocess.STDOUT)
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for _ in range(15):
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if os.path.exists(SOCK): break
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time.sleep(1)
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if not os.path.exists(SOCK):
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log("daemon failed to start"); sys.exit(1)
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log(f"daemon up pid={dp.pid} on {SOCK} [auth REQUIRED, per-command handshake]")
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# metrics
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hs_results = [] # (ok, ms) per handshake
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results = [] # (user, op, ok, latency_ns)
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hs_fail = 0
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stop = threading.Event()
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csv_lock = threading.Lock()
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def make_cmd(u, c):
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pair = c // 8
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X = ((pair + u*7) % 200) + 1
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Y = ((pair*3 + u*5) % 200) + 1
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Z = ((pair*11 + u*13) % 200) + 1
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W = ((pair*17 + u*3) % 200) + 1
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p = f"/c{W:03d}/z{X:03d}/y{Y:03d}/x{Z:03d}"
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op = c % 8
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if op == 0: return op, f"prog {p} const {X} halt"
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if op == 1: return op, f"run {p}"
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if op == 2: return op, f"grant {OWNERS[u]} r 100.1.1.1"
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if op == 3: return op, f"revoke {OWNERS[u]} 100.1.1.1"
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if op == 4: return op, "query fn"
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if op == 5: return op, "stats"
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if op == 6:
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if os.environ.get("NO_AUDIT") == "1":
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return op, "stats" # drop the slow audit op to replicate legacy op mix
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return op, "audit"
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return op, "stats"
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def one_cmd(u):
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"""Open a fresh connection, handshake, run ONE command, close. Returns (hs_ok, hs_ms, op_ok, op_ms)."""
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tenant, owner = TENANTS[u], OWNERS[u]
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s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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try:
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s.connect(SOCK)
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except OSError:
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return (0, 0.0, 0, 0.0)
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s.settimeout(3.0)
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t0 = time.time()
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try:
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chal = read_frame(s)
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if not chal.lower().startswith("challenge "):
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s.close(); return (0, 0.0, 0, 0.0)
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nonce = chal[len("challenge "):].strip()
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sig = sign_hello(PSK, nonce, tenant, owner)
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write_frame(s, f"HELLO {tenant} {owner} {sig}")
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ack = read_frame(s)
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hs_ok = 1 if ack.startswith("ok:") else 0
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hs_ms = (time.time() - t0) * 1000.0
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except Exception:
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s.close(); return (0, 0.0, 0, 0.0)
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if hs_ok == 0:
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s.close(); return (0, hs_ms, 0, 0.0)
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# now run one command on this fresh connection
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op, cmd = make_cmd(u, one_cmd.counter[0])
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one_cmd.counter[0] += 1
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t1 = time.time()
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try:
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write_frame(s, cmd); reply = read_frame(s)
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ok = 0 if reply.lower().startswith("error") else 1
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except socket.timeout:
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ok = 0; reply = "TIMEOUT(>3s)"
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except Exception as e:
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ok = 0; reply = f"EXC:{e}"
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op_ms = (time.time() - t1) * 1e9
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s.close()
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return (1, hs_ms, ok, op_ms)
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def drive_user(u):
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while not stop.is_set() and time.time() < END:
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ho, hms, ok, oms = one_cmd(u)
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with csv_lock:
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hs_results.append((ho, hms))
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results.append((u, -2, ok, oms)) # op -2 = a per-cmd auth+op unit
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one_cmd.counter = [0]
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END = time.time() + DURATION
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threads = [threading.Thread(target=drive_user, args=(u,), daemon=True) for u in range(USERS)]
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for t in threads: t.start()
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for t in threads: t.join()
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stop.set()
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dp.terminate()
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try: dp.wait(timeout=5)
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except Exception: dp.kill()
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with open(CSV, "w", newline="") as f:
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w = csv.writer(f); w.writerow(["user","op","ok","latency_ns"])
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for r in results: w.writerow(r)
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hs_ok = sum(1 for h,_ in hs_results if h == 1)
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ops = [r for r in results if r[1] == -2]
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ok = sum(1 for r in ops if r[2] == 1)
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lat = [r[3] for r in ops]
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def pct(xs,p):
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xs=sorted(xs); k=int(round((p/100)*(len(xs)-1))); return xs[k]/1e6
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log("===== AGGREGATE RESULTS (per-command auth, model A) =====")
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log(f"users : {USERS}")
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log(f"handshakes : {len(hs_results)}")
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log(f"handshake ok : {hs_ok} ({100*hs_ok/max(len(hs_results),1):.2f}%)")
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if hs_results:
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hms=[m for _,m in hs_results]
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log(f"handshake ms mean/max: {st.mean(hms):.3f} / {max(hms):.3f}")
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log(f"total ops : {len(ops)} (incl. their inline handshake)")
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log(f"successful (ok=1) : {ok} ({100*ok/max(len(ops),1):.2f}%)")
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log(f"failed (ok=0) : {len(ops)-ok}")
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if lat:
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log(f"op latency ms mean/med : {st.mean(lat)/1e6:.3f} / {st.median(lat)/1e6:.3f}")
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log(f"op latency ms p95/p99 : {pct(lat,95):.3f} / {pct(lat,99):.3f}")
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log(f"op latency ms max : {max(lat)/1e6:.3f}")
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log(f"TMPD={TMPD}")
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log("DONE.")
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print(f"DONE. results in {TMPD}")
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@@ -0,0 +1,203 @@
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#!/usr/bin/env python3
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# Persistent-connection AUTH stress test for CUBELinux-2 cube-server.
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#
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# Server's REAL model: one signed-HELLO R4 handshake per connection
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# (auth-once), then unlimited ops over the open socket (no per-command
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# re-auth). Fair comparison vs etcd/Redis (auth once at connect).
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#
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# Wire: 4-byte little-endian length prefix + UTF-8 payload (cubesys/src/net.rs).
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# Handshake: server "CHALLENGE <nonce>"; client "HELLO <tenant> <owner> <sig>"
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# sig = HMAC-SHA256(psk, "nonce|tenant|owner_local|") hex (owner_remote absent).
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#
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# Socket has a 3s recv timeout so a WAL-stalled daemon cannot hang the test
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# forever; timed-out ops are counted as failures (revealing the sustainable
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# rate under load). ALL artifacts live on real disk (/root/cube-stress), never
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# tmpfs, because the WAL can exceed tmpfs capacity.
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import os, sys, socket, struct, time, threading, csv, hmac, hashlib, subprocess, tempfile, shutil
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from collections import defaultdict
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import statistics as st
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REPO = os.environ.get("REPO", "/home/CUBELinux/CUBELinux-2")
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SRV = os.path.join(REPO, "target/release/cube-server")
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if not os.path.exists(SRV):
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sys.exit("cube-server release binary missing; build first")
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USERS = int(os.environ.get("USERS", "8"))
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DURATION = int(os.environ.get("DURATION", "150"))
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PER_TENANT = os.environ.get("PER_TENANT", "0") == "1"
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PSK = b"lan-shared-key-1234"
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WORK = "/root/cube-stress"
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os.makedirs(WORK, exist_ok=True)
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TMPD = tempfile.mkdtemp(prefix=f"{WORK}/run-")
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STORE = os.path.join(TMPD, f"store-{os.getpid()}.json")
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PSK_FILE = os.path.join(TMPD, "psk.txt")
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open(PSK_FILE, "w").write(PSK.decode())
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SOCK = os.path.join(TMPD, "cube.sock")
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RUN_LOG = os.path.join(TMPD, "run.log")
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DAEMON_LOG = os.path.join(TMPD, "daemon.log")
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STATS_LOG = os.path.join(TMPD, "stats-samples.log")
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ERR_LOG = os.path.join(TMPD, "run-errors.log")
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CSV = os.path.join(TMPD, "cmds.csv")
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TENANTS = ["alpha","bravo","charlie","delta","echo","foxtrot","golf","hotel","india","juliet"]
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OWNERS = ["alice","bob","carol","dave","erin","frank","grace","heidi","ivan","judy"]
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def log(*a):
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with open(RUN_LOG, "a") as f:
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f.write(" ".join(map(str,a)) + "\n")
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log(f"USERS={USERS} DURATION={DURATION}s PER_TENANT={PER_TENANT} MODE=persistent-connection")
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def write_frame(sock, payload):
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b = payload.encode(); sock.sendall(struct.pack("<I", len(b)) + b)
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def read_frame(sock):
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n = struct.unpack("<I", sock.recv(4))[0]
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return sock.recv(n).decode()
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def sign_hello(psk, nonce, tenant, owner_local, owner_remote=""):
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msg = f"{nonce}|{tenant}|{owner_local}|{owner_remote}".encode()
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return hmac.new(psk, msg, hashlib.sha256).hexdigest()
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daemon_args = [SRV, "--socket", SOCK, "--store", STORE, "--auth-key", PSK_FILE]
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if PER_TENANT:
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tdir = os.path.join(TMPD, "tenants"); os.makedirs(tdir)
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daemon_args += ["--tenant-dir", tdir]
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dp = subprocess.Popen(daemon_args, stdout=open(DAEMON_LOG,"w"), stderr=subprocess.STDOUT)
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for _ in range(15):
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if os.path.exists(SOCK): break
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time.sleep(1)
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if not os.path.exists(SOCK):
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log("daemon failed to start"); sys.exit(1)
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log(f"daemon up pid={dp.pid} on {SOCK} [auth REQUIRED, persistent connections]")
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results = []
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stop = threading.Event()
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csv_lock = threading.Lock()
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def make_cmd(u, c):
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pair = c // 8
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X = ((pair + u*7) % 200) + 1
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Y = ((pair*3 + u*5) % 200) + 1
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Z = ((pair*11 + u*13) % 200) + 1
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W = ((pair*17 + u*3) % 200) + 1
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p = f"/c{W:03d}/z{X:03d}/y{Y:03d}/x{Z:03d}"
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op = c % 8
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if op == 0: return op, f"prog {p} const {X} halt"
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if op == 1: return op, f"run {p}"
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if op == 2: return op, f"grant {OWNERS[u]} r 100.1.1.1"
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if op == 3: return op, f"revoke {OWNERS[u]} 100.1.1.1"
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if op == 4: return op, "query fn"
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if op == 5: return op, "stats"
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if op == 6:
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if os.environ.get("NO_AUDIT") == "1":
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return op, "stats" # drop the slow audit op to replicate legacy op mix
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return op, "audit"
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return op, "stats"
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def drive_user(u):
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tenant, owner = TENANTS[u], OWNERS[u]
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s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM); s.connect(SOCK)
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s.settimeout(3.0)
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errs_logged = 0
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t0 = time.time()
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chal = read_frame(s); assert chal.lower().startswith("challenge ")
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nonce = chal[len("challenge "):].strip()
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sig = sign_hello(PSK, nonce, tenant, owner)
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write_frame(s, f"HELLO {tenant} {owner} {sig}")
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ack = read_frame(s)
|
||||
hs_ms = (time.time() - t0) * 1000.0
|
||||
with csv_lock:
|
||||
results.append((u, -1, 1 if ack.startswith("ok:") else 0, 0, hs_ms))
|
||||
log(f"user {u} handshake ok={ack.startswith('ok:')} {hs_ms:.2f}ms ack={ack!r}")
|
||||
c = 0
|
||||
while not stop.is_set() and time.time() < END:
|
||||
op, cmd = make_cmd(u, c)
|
||||
t0 = time.time()
|
||||
try:
|
||||
write_frame(s, cmd); reply = read_frame(s)
|
||||
ok = 0 if reply.lower().startswith("error") else 1
|
||||
if ok == 0 and op == 1 and errs_logged < 8:
|
||||
with open(ERR_LOG, "a") as ef:
|
||||
ef.write(f"RUN FAIL u={u} c={c} cmd={cmd!r} reply={reply[:160]!r}\n")
|
||||
errs_logged += 1
|
||||
except socket.timeout:
|
||||
ok = 0; reply = "TIMEOUT(>3s)"
|
||||
except Exception as e:
|
||||
ok = 0; reply = f"EXC:{e}"
|
||||
lat = (time.time() - t0) * 1e9
|
||||
with csv_lock:
|
||||
results.append((u, op, ok, lat, 0.0))
|
||||
c += 1
|
||||
s.close()
|
||||
|
||||
END = time.time() + DURATION
|
||||
threads = [threading.Thread(target=drive_user, args=(u,), daemon=True) for u in range(USERS)]
|
||||
for t in threads: t.start()
|
||||
|
||||
def sampler():
|
||||
s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM); s.connect(SOCK)
|
||||
s.settimeout(3.0)
|
||||
chal = read_frame(s); nonce = chal[len("challenge "):].strip()
|
||||
sig = sign_hello(PSK, nonce, "alpha", "sampler")
|
||||
write_frame(s, f"HELLO alpha sampler {sig}"); read_frame(s)
|
||||
n = 0
|
||||
while not stop.is_set():
|
||||
ts = time.strftime("%H:%M:%S", time.gmtime())
|
||||
with open(STATS_LOG, "a") as f:
|
||||
f.write(f"===== sample {n} @ {ts} =====\n")
|
||||
try:
|
||||
write_frame(s, "stats"); f.write(read_frame(s) + "\n")
|
||||
except Exception as e:
|
||||
f.write(f"(sampler failed: {e})\n")
|
||||
n += 1; time.sleep(10)
|
||||
s.close()
|
||||
sthread = threading.Thread(target=sampler, daemon=True); sthread.start()
|
||||
|
||||
for t in threads: t.join()
|
||||
stop.set(); sthread.join(timeout=3)
|
||||
dp.terminate()
|
||||
try: dp.wait(timeout=5)
|
||||
except Exception: dp.kill()
|
||||
|
||||
with open(CSV, "w", newline="") as f:
|
||||
w = csv.writer(f); w.writerow(["user","op","ok","latency_ns","handshake_ms"])
|
||||
for r in results: w.writerow(r)
|
||||
|
||||
rows = results
|
||||
hs = [r[4] for r in rows if r[1] == -1]
|
||||
ops = [r for r in rows if r[1] != -1]
|
||||
ok = sum(1 for r in ops if r[2] == 1)
|
||||
lat = [r[3] for r in ops]
|
||||
def pct(xs,p):
|
||||
xs=sorted(xs); k=int(round((p/100)*(len(xs)-1))); return xs[k]/1e6
|
||||
log("===== AGGREGATE RESULTS (persistent-connection, auth-once) =====")
|
||||
log(f"users : {USERS}")
|
||||
log(f"duration (s) : {DURATION}")
|
||||
log(f"handshakes : {len(hs)} (1 per connection)")
|
||||
if hs: log(f"handshake ms mean/max: {st.mean(hs):.3f} / {max(hs):.3f}")
|
||||
log(f"total ops : {len(ops)}")
|
||||
log(f"successful (ok=1) : {ok} ({100*ok/max(len(ops),1):.2f}%)")
|
||||
log(f"failed (ok=0) : {len(ops)-ok}")
|
||||
if lat:
|
||||
log(f"op latency ms mean/med : {st.mean(lat)/1e6:.3f} / {st.median(lat)/1e6:.3f}")
|
||||
log(f"op latency ms min/p50 : {min(lat)/1e6:.3f} / {pct(lat,50):.3f}")
|
||||
log(f"op latency ms p95/p99 : {pct(lat,95):.3f} / {pct(lat,99):.3f}")
|
||||
log(f"op latency ms max : {max(lat)/1e6:.3f}")
|
||||
byop=defaultdict(list); byop_ok=defaultdict(int)
|
||||
for r in ops: byop[r[1]].append(r[3]); byop_ok[r[1]]+=r[2]
|
||||
log("per-op (op: count, ok, mean_ms, max_ms):")
|
||||
for op in sorted(byop):
|
||||
xs=byop[op]; log(f" op{op}: n={len(xs)} ok={byop_ok[op]} mean={st.mean(xs)/1e6:.3f} max={max(xs)/1e6:.3f}")
|
||||
byu=defaultdict(list); byu_ok=defaultdict(int)
|
||||
for r in ops: byu[r[0]].append(r[3]); byu_ok[r[0]]+=r[2]
|
||||
log("per-user (user: ops, ok, mean_ms):")
|
||||
for u in sorted(byu, key=lambda x:int(x)):
|
||||
xs=byu[u]; log(f" u{u}: ops={len(xs)} ok={byu_ok[u]} mean={st.mean(xs)/1e6:.3f}")
|
||||
# Clean store/WAL so real disk doesn't accumulate; keep logs/csv.
|
||||
for f in (STORE, STORE+".wal", STORE+".delta", STORE+".seq",
|
||||
os.path.expanduser("~/.local/state/cube/cube-store.recovery.ndjson")):
|
||||
try: os.remove(f)
|
||||
except OSError: pass
|
||||
shutil.rmtree(os.path.join(TMPD,"tenants"), ignore_errors=True)
|
||||
log(f"TMPD={TMPD}")
|
||||
log("DONE.")
|
||||
print(f"DONE. results in {TMPD}")
|
||||
Reference in New Issue
Block a user