*do not merge* - logging hacks to see if we can see a bit more

[noonio]

WIP

Do not merge.

Random links:

• https://github.com/kazu-yamamoto/logger
• https://well-typed.com/blog/2024/01/when-blocked-indefinitely-is-not-indefinite/

[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	2025-06-26 15:17:01.762564991 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νInitial	c8a101a5c8ac4816b0dceb59ce31fc2258e387de828f02961d2f2045	2652
νCommit	61458bc2f297fff3cc5df6ac7ab57cefd87763b0b7bd722146a1035c	685
νHead	be6ebc744208c660bf0fdc1cfbb5157477cd305de5b1777e575cbb4c	14665
μHead	1f47a42d1d6edc32ccd834acb19d5db3b2a5232f0bd7eaa8908dc519*	5284
νDeposit	ae01dade3a9c346d5c93ae3ce339412b90a0b8f83f94ec6baa24e30c	1102

• 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	5836	10.35	3.28	0.51
2	6037	12.41	3.92	0.54
3	6238	14.64	4.63	0.58
5	6641	18.80	5.94	0.64
10	7647	29.44	9.29	0.79
43	14281	98.53	30.78	1.80

Commit transaction costs

This uses ada-only outputs for better comparability.

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	561	2.44	1.16	0.20
2	737	3.38	1.73	0.22
3	920	4.36	2.33	0.24
5	1283	6.41	3.60	0.28
10	2174	12.13	7.25	0.40
54	10059	98.61	68.52	1.88

CollectCom transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	56	528	25.20	7.30	0.43
2	114	636	34.23	9.85	0.53
3	171	751	41.36	11.94	0.60
4	226	858	51.16	14.70	0.71
5	282	969	56.37	16.37	0.77
6	337	1085	67.49	19.39	0.88
7	394	1192	82.91	23.53	1.04
8	451	1303	85.79	24.72	1.08

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	1802	23.78	7.94	0.48
2	1882	24.66	8.79	0.50
3	2059	26.85	10.23	0.53
5	2441	31.91	13.29	0.61
10	3228	41.31	19.75	0.77
42	7986	99.01	59.91	1.73

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	609	22.46	7.26	0.41
2	726	23.51	8.19	0.43
3	957	27.03	9.86	0.48
5	1219	30.06	12.02	0.53
10	1953	38.49	17.71	0.67
41	6548	98.32	55.03	1.63

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	677	29.00	9.25	0.48
2	827	29.03	9.99	0.49
3	963	30.77	11.20	0.52
5	1312	35.36	14.16	0.60
10	2083	48.30	21.70	0.79
37	6158	98.07	56.12	1.62

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	670	33.66	10.49	0.53
2	810	35.77	11.79	0.56
3	993	38.33	13.35	0.60
5	1392	43.47	16.47	0.68
10	2037	54.05	23.04	0.84
30	4862	96.45	49.56	1.50

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	5774	26.97	9.03	0.69
2	5950	36.69	12.33	0.80
3	6025	44.60	14.91	0.88
4	6115	50.27	16.77	0.95
5	6305	64.17	21.47	1.10
6	6425	72.36	24.24	1.19
7	6581	79.03	26.51	1.27
8	6680	91.97	30.90	1.41
9	6898	99.83	33.68	1.50

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	1	57	5868	20.78	7.06	0.63
10	5	284	6003	28.92	10.28	0.72
10	10	569	6174	38.64	14.15	0.84
10	30	1708	6855	79.64	30.32	1.31
10	39	2221	7160	99.44	38.05	1.54

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 2025-06-26 15:20:11.634391966 UTC

Baseline Scenario

Number of nodes	1
Number of txs	300
Avg. Confirmation Time (ms)	4.301284086
P99	8.372218339999982ms
P95	5.10982245ms
P50	4.1360885ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-06-26 15:18:50.293485802 UTC	0m	0;
2025-06-26 15:18:55.293304283 UTC	2	0;
2025-06-26 15:19:00.293406963 UTC	7	0;
2025-06-26 15:19:05.293397529 UTC	1	0;
2025-06-26 15:19:10.293378679 UTC	1	0;
2025-06-26 15:19:15.293409427 UTC	1	0;

Three local nodes

Number of nodes	3
Number of txs	900
Avg. Confirmation Time (ms)	34.947646282
P99	73.29900472ms
P95	60.44702249999999ms
P50	31.0532125ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-06-26 15:19:28.599612384 UTC	0m	0;
2025-06-26 15:19:33.599618511 UTC	2	0;
2025-06-26 15:19:38.600630539 UTC	4	0;
2025-06-26 15:19:43.601292982 UTC	20	0;
2025-06-26 15:19:48.599696683 UTC	15	0;
2025-06-26 15:19:53.599622867 UTC	5	0;
2025-06-26 15:19:58.599722445 UTC	2	0;
2025-06-26 15:20:03.599710882 UTC	2	0;
2025-06-26 15:20:08.599621006 UTC	2	0;

[github-actions]

Transaction cost differences

No cost or size differences found

[noonio]

Closing, as we've moved on to #2088 .

But I'll leave the branch/commits here, so we can look back over it for a while until we fix #2086 .