From a93891ee72bb1793eb1845d6d49369cb9f1e8806 Mon Sep 17 00:00:00 2001
From: eunhhu <necpition205@gmail.com>
Date: Mon, 19 Oct 2026 14:44:13 +0100
Subject: 047: "the leaf is the commit" (feedback 009) set up before it runs:
 today's store measured as the base (baseline.py, 046's shim and journal: list
 bytes a message, the log and images, at 1 / 16 / 256 messages a commit:
 entries' appends 65.5 / 15.7 / 12.4, the bank's transfers 122 / 35.6 / 30.1,
 the tree apart), and a byte-accounting model (model.py) of commits writing
 the leaves they changed in memory's own bytes (leaf 296 to 1,320 B, inner
 node 680 B, cow; tail appends in place past every kept snapshot's count;
 inplace, which may not be, to show why), its bars written before the run
 (appends at most today's, sparse updates at most twice, no write a kept
 snapshot sees) and what a pass for appends with a miss for updates would mean
 (two units, not one); 046's Run takes pure-run's arguments; 045's keyed file
 says 24 refused, not the 26 its commit said

---
 research/experiments/047-leaf-commit/baseline.py | 101 +++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 research/experiments/047-leaf-commit/baseline.py

(limited to 'research/experiments/047-leaf-commit/baseline.py')

diff --git a/research/experiments/047-leaf-commit/baseline.py b/research/experiments/047-leaf-commit/baseline.py
new file mode 100644
index 0000000..ace86fa
--- /dev/null
+++ b/research/experiments/047-leaf-commit/baseline.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+"""Research 047: what today's store writes for a workload, by file, as the base the leaf-commit model is held to.
+046's owner (pure-run --store, the shim shipping every cut to a follower, its journal kept) takes a workload's messages
+at a commit grouping (pure-run --batch N: N messages a save); the journal's ops give the bytes written, by file: the
+list log (log-N), the lists' images, the tree's commits (pure.tree) and its compactions (.pending-*), zeros apart. A
+workload with a setup (the bank's branches, tellers and accounts) runs twice, setup alone and setup then the work, and
+the work's bytes are the difference.
+
+  baseline.py entries MESSAGES        appends of one number (046's entries.aup)
+  baseline.py bank ACCOUNTS TRANSFERS the bank (benchmarks/bank/bank.aup): 10 branches, 100 tellers, ACCOUNTS accounts,
+                                      then TRANSFERS transfers (uniform aid, tid, bid; a whole delta in -5000..5000)
+One JSON line a grouping (1, 16, 256)."""
+import collections
+import json
+import random
+import struct
+import subprocess
+import sys
+from pathlib import Path
+
+HERE = Path(__file__).resolve().parent
+sys.path.insert(0, str(HERE.parent / '046-commit-replica'))
+import prefixes  # noqa: E402  (046's journal reader)
+import run as harness  # noqa: E402
+
+PURE = HERE.parents[2]
+
+
+def entries_commands(n):
+    return [harness.message(i) for i in range(n)], 0
+
+
+def bank_commands(accounts, transfers, seed=47):
+    rng = random.Random(seed)
+    setup = [f'message branch {struct.pack("<I", b).hex()}\n' for b in range(10)]
+    setup += [f'message teller {struct.pack("<II", t, t % 10).hex()}\n' for t in range(100)]
+    setup += [f'message account {struct.pack("<II", a, a % 10).hex()}\n' for a in range(accounts)]
+    work = [f'message transfer {struct.pack("<IIId", rng.randrange(accounts), rng.randrange(100), rng.randrange(10), float(rng.randint(-5000, 5000))).hex()}\n'
+            for _ in range(transfers)]
+    return setup + work, len(setup)
+
+
+def written(journal):
+    """Bytes written by file kind (zeros apart), and the number of syncs."""
+    out, zeros, syncs = collections.Counter(), collections.Counter(), 0
+    for kind, path, rest, _ in prefixes.ops_of(journal.read_bytes()):
+        if kind == prefixes.OP_SYNC:
+            syncs += 1
+        if kind != prefixes.OP_WRITE:
+            continue
+        name = ('compaction' if path.startswith('.pending') else 'image' if 'image' in path else
+                'log' if path.startswith('log-') else 'tree' if path == 'pure.tree' else path)
+        data = rest[12:]
+        out[name] += len(data)
+        if not any(data):
+            zeros[name] += len(data)
+    return out, zeros, syncs
+
+
+def one(keys, module, commands, batch):
+    journal = harness.WORK / 'journal'
+    harness.ENV['SHIM_JOURNAL'] = str(journal)
+    r = harness.Run(keys, module=module, extra=('--batch', str(batch)) if batch > 1 else ())
+    try:
+        for c in commands:
+            r.owner.stdin.write(c)
+        r.owner.stdin.close()
+    except BrokenPipeError:
+        pass
+    r.owner.wait()
+    r.reader.join(timeout=30)
+    r.shipper.communicate(timeout=60)
+    r.stop_follower()
+    del harness.ENV['SHIM_JOURNAL']
+    return written(journal), r.done
+
+
+def main():
+    keys = harness.build()
+    what = sys.argv[1]
+    if what == 'entries':
+        module, (commands, setup) = 'entries', entries_commands(int(sys.argv[2]))
+    else:
+        subprocess.run([str(harness.AUP), 'build', str(PURE / 'benchmarks' / 'bank' / 'bank.aup'), '-o',
+                        str(harness.WORK / 'bank.pmod')], check=True)
+        module, (commands, setup) = 'bank', bank_commands(int(sys.argv[2]), int(sys.argv[3]))
+    work = len(commands) - setup
+    for batch in (1, 16, 256):
+        (total, zeros, syncs), done = one(keys, module, commands, batch)
+        if setup:
+            (base, base_zeros, base_syncs), _ = one(keys, module, commands[:setup], batch)
+            total, zeros, syncs = total - base, zeros - base_zeros, syncs - base_syncs
+        print(json.dumps({'workload': what, 'messages': work, 'batch': batch, 'done': done,
+                          'bytes_per_message': {k: round(v / work, 1) for k, v in sorted(total.items())},
+                          'zero_bytes_per_message': {k: round(v / work, 1) for k, v in sorted(zeros.items())},
+                          'list_bytes_per_message': round((total['log'] + total['image']) / work, 1),
+                          'syncs_per_message': round(syncs / work, 3)}), flush=True)
+
+
+if __name__ == '__main__':
+    main()
-- 
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