Fix for the hydrate function and 0.22.1 release

[noonio]

This is a small patch release (+ the code itself) to fix the ReplayingState stalling bug that was being observed.

There is some follow-up work to be done in #2086 ; but this never-the-less represents an improvement.

Fixes #2089

[noonio]

Can't put this commit on master. See: #2092

[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	2025-06-27 14:30:01.224327708 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	10.14	3.20	0.51
2	6039	12.87	4.09	0.55
3	6236	14.47	4.57	0.57
5	6641	18.97	6.00	0.64
10	7644	29.09	9.17	0.79
43	14279	98.82	30.88	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	742	3.38	1.73	0.22
3	917	4.36	2.33	0.24
5	1276	6.41	3.60	0.28
10	2174	12.13	7.25	0.40
54	10070	98.61	68.52	1.88

CollectCom transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	56	524	24.46	7.13	0.42
2	114	636	33.25	9.61	0.52
3	170	747	41.20	11.92	0.60
4	228	858	48.25	14.02	0.68
5	285	974	56.36	16.36	0.77
6	338	1085	73.09	20.73	0.94
7	395	1192	72.97	21.15	0.94
8	450	1303	99.90	28.19	1.22
9	506	1414	90.61	26.11	1.13

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	1795	23.78	7.94	0.48
2	2019	26.19	9.45	0.52
3	2068	26.72	10.20	0.53
5	2395	31.08	12.96	0.60
10	3023	38.80	18.70	0.73
42	7883	99.30	59.89	1.73

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	622	22.50	7.27	0.41
2	785	25.36	8.73	0.45
3	945	26.09	9.58	0.47
5	1303	32.10	12.61	0.56
10	1969	40.33	18.23	0.69
42	6641	98.19	55.64	1.64

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	659	28.99	9.24	0.48
2	836	29.03	10.00	0.49
3	902	32.55	11.67	0.54
5	1176	36.02	14.08	0.59
10	2090	45.13	20.74	0.76
36	5978	95.47	54.57	1.58

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	678	33.73	10.50	0.53
2	768	35.02	11.47	0.55
3	942	37.62	13.03	0.59
5	1341	43.66	16.49	0.68
10	2057	53.48	22.86	0.84
29	4810	96.69	49.10	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	5779	27.04	9.05	0.69
2	5948	36.73	12.33	0.80
3	6026	44.48	14.90	0.88
4	6186	54.92	18.41	1.00
5	6358	65.32	21.89	1.12
6	6491	73.70	24.71	1.21
7	6726	85.31	28.79	1.34
8	6813	94.01	31.78	1.44

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	21.23	7.22	0.63
10	5	285	6004	29.80	10.58	0.73
10	10	569	6174	39.27	14.37	0.84
10	20	1139	6513	60.46	22.69	1.09
10	30	1707	6853	81.41	30.92	1.33
10	39	2219	7158	98.11	37.59	1.53

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 2025-06-27 14:33:05.62171876 UTC

Baseline Scenario

Number of nodes	1
Number of txs	300
Avg. Confirmation Time (ms)	4.313699016
P99	5.8977423599999925ms
P95	5.04442325ms
P50	4.1934735ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-06-27 14:31:50.214109914 UTC	0m	0;
2025-06-27 14:31:55.213948486 UTC	8	0;
2025-06-27 14:32:00.213898708 UTC	6	0;
2025-06-27 14:32:05.213939851 UTC	1	0;
2025-06-27 14:32:10.213863253 UTC	1	0;
2025-06-27 14:32:15.213855916 UTC	1	0;

Three local nodes

Number of nodes	3
Number of txs	900
Avg. Confirmation Time (ms)	29.975068542
P99	58.350397269999995ms
P95	46.77941479999999ms
P50	27.388838999999997ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-06-27 14:32:28.500280111 UTC	0m	0;
2025-06-27 14:32:33.500950269 UTC	8	0;
2025-06-27 14:32:38.501330665 UTC	5	0;
2025-06-27 14:32:43.500285534 UTC	23	0;
2025-06-27 14:32:48.5003181 UTC	14	0;
2025-06-27 14:32:53.500275487 UTC	2	0;
2025-06-27 14:32:58.500416958 UTC	2	0;
2025-06-27 14:33:03.500370743 UTC	2	0;

[github-actions]

Transaction cost differences

No cost or size differences found