*DO NOT MERGE* Doom hotfixes

[noonio]

• Memory leak hotfix ( see DONT MERGE: Not leak memory #1572 )
• Persistence hotfix ( see NOT MERGE: Less reliable persistence prototype #1495 )

Note that this will never be merged; it's merely an attempt to get a "fastest-possible" estimate for writing something, and not crashing with too much memory.

Instead of this PR, we will:

• Use a different persistence backend
• Actually address memory issues Event Log Rotation and Memory Growth #1581

[github-actions]

Transaction cost differences

Script summary

Name	Size (Bytes)
νInitial	-
νCommit	-
νHead	-
μHead	-
νDeposit	-

Init transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
44	-	-	-	-

Commit transaction costs

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
54	-	-	-	-

CollectCom transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-	-
2	-	-	-	-	-
3	-	-	-	-	-
4	-	-	-	-	-
5	-	-	-	-	-
6	-	-	-	-	-
7	-	-	-	-	-
8	-	-	-	-	-
10	-	-	-	-	-

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	$${\color{green}-0.38}$$	$${\color{green}-0.09}$$	$${\color{green}-0.01}$$
3	-	-	-	-
5	-	+0.39	+0.1	-
10	-	$${\color{green}-0.39}$$	$${\color{green}-0.09}$$	-
43	-	+0.39	+0.09	-

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
45	-	-	-	-

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
41	-	-	-	-

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	-	-	-	-
2	-	-	-	-
3	-	-	-	-
5	-	-	-	-
10	-	-	-	-
33	-	-	-	-

FanOut transaction costs

UTxO, Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
(0, 10)	-	-	-	-	-
(1, 10)	-	-	-	-	-
(5, 10)	-	-	-	-	-
(10, 10)	-	-	-	-	-
(20, 10)	-	-	-	-	-
(40, 10)	-	-	-	-	-
(41, 10)	-	-	-	-	-

[github-actions]

Transaction costs

Sizes and execution budgets for Hydra protocol transactions. Note that unlisted parameters are currently using arbitrary values and results are not fully deterministic and comparable to previous runs.

Metadata
Generated at	2025-01-03 15:33:14.520420818 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νInitial	00a6ddbc130ab92f5b7cb8d1ccd8d79eca5bfe25f6843c07b62841f0	2667
νCommit	3e5a776bcee213e3dfd15806952a10ac5590e3e97d09d62eb99266b2	690
νHead	5350e9d521552ebfd9e846fd70c3b801f716fc14296134ec0fb71e97	14495
μHead	482c3ce15cde05bc905b915ccfa2546e500be1c5d722389026c37aa3*	5615
νDeposit	de09cec5f84eedaf64186cb52ba4ee6e74e6fc368af25b90d457f352	1118

• The minting policy hash is only usable for comparison. As the script is parameterized, the actual script is unique per head.

Init transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	6164	10.00	3.17	0.53
2	6365	12.19	3.87	0.56
3	6566	14.43	4.59	0.59
5	6969	18.57	5.89	0.65
10	7974	28.57	9.02	0.80
44	14815	98.04	30.85	1.82

Commit transaction costs

This uses ada-only outputs for better comparability.

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	561	2.45	1.17	0.20
2	744	3.40	1.74	0.22
3	923	4.39	2.34	0.24
5	1282	6.46	3.61	0.29
10	2180	12.24	7.28	0.40
54	10064	99.20	68.72	1.89

CollectCom transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	525	24.20	7.07	0.42
2	114	636	33.06	9.59	0.51
3	170	747	39.56	11.52	0.59
4	226	858	53.66	15.30	0.73
5	282	969	55.78	16.23	0.76
6	339	1081	72.42	20.54	0.93
7	394	1192	76.01	21.92	0.97
8	450	1303	84.81	24.53	1.07
9	505	1414	97.16	27.74	1.20
10	560	1525	99.32	28.73	1.23

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	1810	24.13	8.02	0.48
2	1899	24.21	8.68	0.49
3	2083	27.08	10.30	0.53
5	2379	30.48	12.81	0.59
10	3239	41.12	19.71	0.77
45	8128	99.44	62.01	1.76

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	601	22.68	7.32	0.41
2	795	25.39	8.74	0.45
3	966	26.75	9.80	0.48
5	1171	29.30	11.85	0.52
10	2079	41.88	18.68	0.71
42	6865	98.51	55.93	1.65

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	597	28.00	8.86	0.47
2	817	28.64	9.90	0.49
3	954	30.22	11.07	0.52
5	1172	35.51	13.97	0.59
10	1942	45.45	20.61	0.75
37	5900	90.57	53.68	1.53

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	671	33.31	10.41	0.52
2	814	35.29	11.68	0.56
3	896	36.61	12.65	0.58
5	1245	41.50	15.64	0.65
10	2096	53.11	22.92	0.84
31	5160	97.16	51.08	1.53

Abort transaction costs

There is some variation due to the random mixture of initial and already committed outputs.

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	6073	26.09	8.83	0.69
2	6215	35.55	12.08	0.80
3	6246	40.08	13.48	0.85
4	6457	52.95	17.94	0.99
5	6727	63.96	21.75	1.12
6	6673	70.27	23.73	1.18
7	6622	70.95	23.85	1.19
8	7169	92.78	31.64	1.44
9	7139	97.87	33.25	1.49

FanOut transaction costs

Involves spending head output and burning head tokens. Uses ada-only UTXO for better comparability.

Parties	UTxO	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
10	0	0	6163	18.03	6.15	0.61
10	1	57	6196	19.62	6.80	0.63
10	5	285	6333	27.45	9.95	0.72
10	20	1137	6839	57.20	21.90	1.07
10	30	1708	7182	76.79	29.78	1.30
10	40	2276	7520	96.18	37.59	1.53
10	41	2333	7554	97.98	38.32	1.55

End-to-end benchmark results

This page is intended to collect the latest end-to-end benchmark results produced by Hydra's continuous integration (CI) system from the latest master code.

Please note that these results are approximate as they are currently produced from limited cloud VMs and not controlled hardware. Rather than focusing on the absolute results, the emphasis should be on relative results, such as how the timings for a scenario evolve as the code changes.

Generated at 2025-01-03 15:36:08.651745093 UTC

Baseline Scenario

Number of nodes	1
Number of txs	300
Avg. Confirmation Time (ms)	1.701689410
P99	2.348573399999999ms
P95	2.03803905ms
P50	1.6628715ms
Number of Invalid txs	0

Three local nodes

Number of nodes	3
Number of txs	900
Avg. Confirmation Time (ms)	44.856770553
P99	210.29256548ms
P95	119.2189336ms
P50	19.0422895ms
Number of Invalid txs	0

[noonio]

Note: I've bumped this to the latest updates (incremental commits, etc).