cproof/baseline.csv at 16aa5693291334e0ecee4f93cefa8a56884180eb

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perf+harden(export): 25x faster export at 1M, mkstemp, full-body dedup

Address 6 of 7 high/medium audit findings on database_export.c.
End-to-end migration of 1M rows: ~5 min -> ~1 min.

  H1  cache g_slist_length(merged) out of the write loop — was O(n²)
      via 2000 list walks at 500-row progress interval, now O(1).
        S7a_export_cold @ 1M:  309 s -> 11.2 s  (-96 %)

  L1  splice existing flatfile lines into merged via ownership
      transfer instead of 12-strdup deep-copy + g_date_time_ref;
      free list nodes only, NULL out existing.
        S7b_export_dedup @ 1M: 304 s -> 13.3 s  (-96 %)
        RSS @ S7b 1M: 2.4 GB -> 1.9 GB

  H2  mkstemp() with random suffix instead of fixed
      "{log_path}.export.tmp". Eliminates the unlink-and-retry race
      where two concurrent exports could clobber each other's
      in-flight tmp files.

  M4  SHA-256 over full body (incremental g_checksum_update) in
      the dedup-key fallback. Previous body[:256] hash collided
      on common preambles (signatures, code blocks) — second
      occurrence silently dropped on import.

  M2  Refuse _ff_read_all_lines on files > 2 GB. Each line expands
      ~10x in heap on parse; without a cap we OOM-kill prof on
      large flatfiles. Surface a clear error instead.

  M5  Break the outer import loop on system-level INSERT failure.
      Was cascading "Import of X failed" through every remaining
      contact when the real issue was disk-full / sqlite locked.

Verified on bench-pipeline-max: 1M rows, full content diff,
mismatches=0. baseline.csv updated.

Deferred: M3 O_TMPFILE (platform-conditional + linkat dance;
mkstemp covers most of the same window) and M6 SIGINT cancellation
(needs event-loop architecture changes).

2026-04-30 17:10:39 +03:00

5.1 KiB

Raw Blame History

1	scenario	volume	bytes	lines	wall_ms	peak_rss_kb	note
2	S1_cold_tail	small	39494716	10002	46.040	14408	tail page=100
3	S2_warm_tail	small	39494716	10002	33.878	14716	tail page=100
4	S3_deep_pagination	small	39494716	10002	1.024	14716	n_pages=1000
5	S4_first_build	small	39494716	10002	39.139	14716	idx_entries=20
6	S5_incremental_extend	small	104411	1000	0.859	14716	appended=1000_lines
7	S6_verify	small	39494716	10002	396.022	16424	total=1 err=0 warn=1 info=0
8	L1	longmsg	110586	100	1.486	9432	n=100 body=1024 write=0.8ms read=0.6ms parsed=100 mismatch=0 parse_fail=0 1KB body x100
9	L2	longmsg	1032186	100	10.468	9432	n=100 body=10240 write=5.7ms read=4.8ms parsed=100 mismatch=0 parse_fail=0 10KB body x100
10	L3	longmsg	10248186	100	100.337	9816	n=100 body=102400 write=57.3ms read=43.1ms parsed=100 mismatch=0 parse_fail=0 100KB body x100
11	L4	longmsg	52432936	50	502.785	13608	n=50 body=1048576 write=264.5ms read=238.3ms parsed=50 mismatch=0 parse_fail=0 1MB body x50
12	L5	longmsg	52429696	10	518.558	27764	n=10 body=5242880 write=264.4ms read=254.2ms parsed=10 mismatch=0 parse_fail=0 5MB body x10
13	L6	longmsg	41435552	4	407.803	45852	n=4 body=10358784 write=211.3ms read=196.5ms parsed=4 mismatch=0 parse_fail=0 9.9MB body x4 (just under FF_MAX_LINE_LEN)
14	L7	longmsg	10485981	2	3.750	45852	oversize=10485761_rejected=yes read=3.8ms parsed=1
15	L8	longmsg	5175286	50	45.549	45852	n=50 body=102400 write=26.6ms read=18.9ms parsed=50 mismatch=0 parse_fail=0 100KB body w/ \n every 100B
16	L9	longmsg	5124136	50	45.487	45852	n=50 body=102400 write=24.5ms read=21.0ms parsed=50 mismatch=0 parse_fail=0 100KB body w/ pipes
17	L10	longmsg	5124136	50	43.254	45852	n=50 body=102400 write=18.9ms read=24.4ms parsed=50 mismatch=0 parse_fail=0 100KB body utf-8 emoji
18	L11	longmsg	110586	100	1.284	45852	n=100 body=1024 write=0.7ms read=0.6ms parsed=100 mismatch=0 parse_fail=0 sanity baseline
19	L12	longmsg	5415366	1000	26.437	45852	5x1MB_in_last_100 parsed=1000
20	L13	longmsg	104865786	100	932.630	45852	n=100 body=1048576 write=485.7ms read=446.9ms parsed=100 mismatch=0 parse_fail=0 verify-equiv full parse on 100x1MB
21	L14	longmsg	102481986	1000	962.342	45852	n=1000 body=102400 write=510.4ms read=452.0ms parsed=1000 mismatch=0 parse_fail=0 rapid append 1000x100KB
22	F1	fail-pass	904	0	0.118	9540	issues total=1 err=0 warn=1 (partial-line tail; expect graceful handle)
23	F2	fail-pass	1119	0	0.113	9540	warnings=2 (expect CRLF warning) first_warn=File permissions are 644 expected 600 (sensitive data)
24	F3	fail-pass	341	0	0.072	9540	errors=1 warnings=1 (expect 1 unparsable line for mid-file BOM) first=Unparsable line
25	F7	fail-pass	527	0	0.082	9540	issues total=1 err=0 (cycle handled at read-time not verify)
26	F8	fail-pass	19044	0	0.981	9540	201 lines (1 orig + 200 corrections) errors=0 warns=1
27	F9	fail-pass	341	0	0.069	9540	errors=0 (parser splits at first ': ' — not flagged but body truncated)
28	F10	fail-pass	176	0	0.060	9540	errors=0 warnings=1 (RTL/ZWSP preserved literally)
29	F11	fail-pass	323	0	0.264	9540	errors=1 (Latin-1 byte: error or fallback OK)
30	F12	fail-pass	330	0	0.071	9540	errors=0 (empty body OK)
31	F14	fail-pass	23236	0	0.914	9540	v1_lines=100 v2_lines=250 (expect rebuild detected and 250 lines)
32	F15	fail-pass	0	0	0.121	9540	errors=0 infos=1 warnings=1 (empty file should yield INFO)
33	S1_cold_tail	lmc	389183687	100002	480.428	43456	tail page=100
34	S2_warm_tail	lmc	389183687	100002	477.482	43456	tail page=100
35	S3_deep_pagination	lmc	389183687	100002	1.066	43456	n_pages=1000
36	S4_first_build	lmc	389183687	100002	473.604	43456	idx_entries=200
37	S5_incremental_extend	lmc	104411	1000	0.902	43456	appended=1000_lines
38	S6_verify	lmc	389183687	100002	3892.137	43456	total=1 err=0 warn=1 info=0
39	S6_verify	ooo	397586720	100002	4037.058	33336	total=17573 err=0 warn=17573 info=0
40	S7a_export_cold	pipe100000	40714240	100000	1231.613	148128	exported=100000 db_rows=100000
41	S7b_export_dedup	pipe100000	40714240	100000	1484.406	199460	exported=0 db_rows=100000
42	S7_seed_export	pipe100000	40714240	100000	1238.138	148208	exported=100000 db_rows=100000
43	S8a_import_cold	pipe100000	40628224	100000	3237.481	123108	imported=100000 rows_before=0 rows_after=100000
44	S8b_import_idempotent	pipe100000	40628224	0	1047.286	194860	imported=0 rows_before=100000 rows_after=100000
45	S8e_roundtrip	pipe100000	40521728	100000	6520.475	148184	rows=100000 seed=1591ms export=1237ms import=3376ms diff=317ms exported=100000 imported=100000 rows_a=100000 rows_b=100000 mismatches=0 body=0 lmc=0
46	S7a_export_cold	pipe1000000	407732224	1000000	11247.107	1376772	exported=1000000 db_rows=1000000
47	S7b_export_dedup	pipe1000000	407732224	1000000	13262.643	1873220	exported=0 db_rows=1000000
48	S7_seed_export	pipe1000000	407732224	1000000	12125.624	1377076	exported=1000000 db_rows=1000000
49	S8a_import_cold	pipe1000000	406605824	1000000	36877.801	1124804	imported=1000000 rows_before=0 rows_after=1000000
50	S8b_import_idempotent	pipe1000000	406605824	0	11986.786	1841488	imported=0 rows_before=1000000 rows_after=1000000
51	S8e_roundtrip	pipe1000000	405757952	1000000	66449.762	1377084	rows=1000000 seed=20012ms export=11939ms import=31533ms diff=2966ms exported=1000000 imported=1000000 rows_a=1000000 rows_b=1000000 mismatches=0 body=0 lmc=0

5.1 KiB Raw Blame History

5.1 KiB

Raw Blame History