Improve fee estimation in internal wallet

[ch1bo]

🪙 Using the cardano-ledger we improve the fee estimation to be within 0.1 ADA of the minimum fee.

🪙 Practically, this reduces cost of initializing and aborting a single party head from about 6.4 ADA to only 3.7 ADA.

🪙 There is still some overestimation in coverFees, however this is only due to the commit transaction requiring (usually) two witnesses, while all other txs would only be fine with one.

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• CHANGELOG updated or not needed
• Documentation updated or not needed
• Haddocks updated or not needed
• No new TODOs introduced or explained herafter
  • An XXX note how to address the witness overestimation / make commit more flexible in the future.

[github-actions]

Transactions 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	2024-02-21 17:53:48.067432512 UTC
Max. memory units	14000000
Max. CPU units	10000000000
Max. tx size (kB)	16384

Script summary

Name	Hash	Size (Bytes)
νInitial	985245919fcc6c0c5cd116023cd2c947c43e80dcbb5075fe12433fbb	4072
νCommit	7cb20fa71eb4c563ca283566ebe0aa65859d96c3f8cba35c52c181fd	2043
νHead	7a36661f5c15e9f1783aeaab890812c59b7286cbbc6de762d3110772	8816
μHead	8b111ac12274e46314769295a1c5dcab1d260096fc469fd698065463*	3851

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

Cost of Init Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	4432	10.25	3.95	0.46
2	4633	12.85	4.95	0.49
3	4835	14.89	5.72	0.52
5	5241	19.33	7.40	0.59
10	6240	30.41	11.60	0.75
41	12475	99.12	37.64	1.77

Cost of Commit Transaction

This is using ada-only outputs for better comparability.

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	591	11.37	4.44	0.30
2	781	15.04	6.07	0.35
3	972	18.85	7.75	0.40
5	1338	26.90	11.27	0.51
10	2278	49.55	20.97	0.80
19	3965	99.43	41.75	1.43

Cost of CollectCom Transaction

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	544	21.78	8.51	0.41
2	114	654	34.21	13.47	0.55
3	170	764	45.96	18.29	0.69
4	227	874	59.41	23.86	0.84
5	283	984	77.21	31.09	1.04
6	339	1099	93.03	37.74	1.22

Cost of Close Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	595	16.64	7.66	0.37
2	736	18.09	8.99	0.39
3	857	19.45	10.27	0.42
5	1267	22.82	13.49	0.49
10	2130	30.93	21.19	0.65
50	7809	89.55	76.04	1.77

Cost of Contest Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	644	20.27	8.99	0.41
2	773	21.76	10.32	0.43
3	937	23.78	12.02	0.47
5	1346	28.29	15.82	0.55
10	1977	35.82	22.43	0.69
47	7456	98.76	76.94	1.83

Cost of Abort Transaction

Some variation because of random mixture of still initial and already committed outputs.

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	4223	15.19	6.26	0.50
2	4513	31.87	13.91	0.71
3	4541	45.05	19.64	0.86
4	4650	58.34	25.41	1.01
5	4807	74.26	32.31	1.19

Cost of FanOut Transaction

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 ₳
5	0	0	4266	7.63	3.19	0.42
5	1	57	4299	8.86	3.96	0.44
5	5	285	4436	13.77	7.00	0.51
5	10	570	4605	20.13	10.90	0.59
5	20	1139	4945	32.43	18.53	0.76
5	30	1709	5286	44.73	26.16	0.93
5	40	2277	5624	56.83	33.70	1.10
5	50	2846	5963	69.35	41.43	1.27
5	75	4268	6811	99.95	60.45	1.69

End-To-End Benchmark Results

This page is intended to collect the latest end-to-end benchmarks results produced by Hydra's Continuous Integration system from the latest master code.

Please take those results with a grain of salt as they are currently produced from very limited cloud VMs and not controlled hardware. Instead of focusing on the absolute results, the emphasis should be on relative results, eg. how the timings for a scenario evolve as the code changes.

Generated at 2024-02-21 17:57:17.038809719 UTC

Baseline Scenario

Number of nodes	3
Number of txs	9000
Avg. Confirmation Time (ms)	23.159508195
P99	113.35773657000003ms
P95	32.2337339ms
P50	20.1000715ms
Number of Invalid txs	0

Baseline Scenario

Number of nodes	1
Number of txs	3000
Avg. Confirmation Time (ms)	4.616345710
P99	9.658092109999993ms
P95	6.277151649999996ms
P50	4.2871555ms
Number of Invalid txs	0

[github-actions]

Test Results

416 tests  ±0   409 ✅ ±0   13m 47s ⏱️ +2s
139 suites ±0     7 💤 ±0 
  5 files   ±0     0 ❌ ±0 

Results for commit b15b69f. ± Comparison against base commit 4463d6f.