add workflow to simulate node restarts using pumba

[ffakenz]

Randomly restarts hydra-node containers during benchmarks to observe system resilience and network recovery behavior.

---

• CHANGELOG updated or not needed
• Documentation updated or not needed
• Haddocks updated or not needed
• No new TODOs introduced or explained herafter

[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	2025-07-15 13:39:53.835188272 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	10.19	3.22	0.51
2	6037	12.46	3.94	0.55
3	6239	14.72	4.66	0.58
5	6640	18.43	5.81	0.63
10	7648	29.12	9.18	0.79
43	14285	98.73	30.85	1.80

Commit transaction costs

This uses ada-only outputs for better comparability.

UTxO	Tx size	% max Mem	% max CPU	Min fee ₳
1	559	2.44	1.16	0.20
2	739	3.38	1.73	0.22
3	923	4.36	2.33	0.24
5	1280	6.41	3.60	0.28
10	2173	12.13	7.25	0.40
54	10060	98.61	68.52	1.88

CollectCom transaction costs

Parties	UTxO (bytes)	Tx size	% max Mem	% max CPU	Min fee ₳
1	57	525	24.43	7.12	0.42
2	114	636	34.31	9.88	0.53
3	170	747	43.59	12.49	0.63
4	226	858	51.97	14.89	0.72
5	283	974	61.14	17.48	0.81
6	339	1081	65.99	19.00	0.87
7	397	1192	78.65	22.46	1.00
8	449	1303	83.35	24.08	1.05
9	504	1414	93.68	26.90	1.16

Cost of Increment Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	1748	23.20	7.66	0.47
2	1938	25.24	9.07	0.50
3	2104	27.88	10.62	0.54
5	2545	32.61	13.63	0.62
10	3076	38.33	18.61	0.73
40	7375	92.88	56.21	1.63

Cost of Decrement Transaction

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	633	22.80	7.37	0.42
2	758	24.25	8.44	0.44
3	977	26.93	9.85	0.48
5	1230	29.09	11.77	0.52
10	2184	42.84	18.97	0.73
41	6285	91.20	53.07	1.55

Close transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	708	27.33	8.81	0.47
2	740	30.15	10.16	0.50
3	1019	31.36	11.49	0.53
5	1269	34.75	13.87	0.59
10	2079	48.27	21.69	0.79
37	5935	96.18	55.11	1.59

Contest transaction costs

Parties	Tx size	% max Mem	% max CPU	Min fee ₳
1	628	33.02	10.19	0.52
2	808	35.65	11.76	0.56
3	995	38.45	13.37	0.60
5	1295	42.43	15.94	0.66
10	2013	53.69	22.88	0.84
29	4997	98.47	49.98	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	5823	27.09	9.09	0.69
2	5902	34.91	11.69	0.78
3	6162	45.69	15.41	0.90
4	6172	50.34	16.86	0.95
5	6443	63.88	21.53	1.11
6	6619	71.36	24.02	1.19
7	6678	78.57	26.39	1.27
8	6783	88.65	29.75	1.38

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	5834	19.64	6.56	0.61
10	5	285	6004	28.92	10.28	0.72
10	10	570	6174	38.83	14.22	0.84
10	20	1138	6512	59.57	22.38	1.08
10	30	1705	6851	80.53	30.62	1.32
10	39	2220	7159	98.99	37.90	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 2025-07-15 13:44:24.62940793 UTC

Baseline Scenario

Number of nodes	1
Number of txs	300
Avg. Confirmation Time (ms)	4.312965576
P99	10.907685739999993ms
P95	5.101238800000001ms
P50	4.055712ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-07-15 13:43:09.024184223 UTC	0m	0;
2025-07-15 13:43:14.024089504 UTC	13	0;
2025-07-15 13:43:19.023958568 UTC	5	0;
2025-07-15 13:43:24.02396027 UTC	1	0;
2025-07-15 13:43:29.023923484 UTC	1	0;
2025-07-15 13:43:34.024046736 UTC	1	0;

Three local nodes

Number of nodes	3
Number of txs	900
Avg. Confirmation Time (ms)	27.458376682
P99	42.65176027ms
P95	35.95386865ms
P50	26.390521ms
Number of Invalid txs	0

Memory data

Time	Used	Free
2025-07-15 13:43:47.498015825 UTC	0m	0;
2025-07-15 13:43:52.498634236 UTC	11	0;
2025-07-15 13:43:57.498205229 UTC	5	0;
2025-07-15 13:44:02.498138877 UTC	22	0;
2025-07-15 13:44:07.498078692 UTC	14	0;
2025-07-15 13:44:12.498090064 UTC	2	0;
2025-07-15 13:44:17.49819017 UTC	2	0;
2025-07-15 13:44:22.498028287 UTC	2	0;

[github-actions]

Transaction cost differences

No cost or size differences found