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Sassafras Consensus Pallet (#1577)

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This PR introduces the pallet for Sassafras consensus.

## Non Goals

The pallet delivers only the bare-bones and doesn't deliver support for
auxiliary functionalities such as equivocation report and support for
epoch change via session pallet.

These functionalities were drafted in the [main
PR](https://github.com/paritytech/polkadot-sdk/pull/1336), but IMO is
better to introduce this auxiliary stuff in a follow up PR and after
client code.

## Potential follow ups

https://github.com/paritytech/polkadot-sdk/issues/2364

---------

Co-authored-by: Sebastian Kunert <skunert49@gmail.com>
Co-authored-by: Koute <koute@users.noreply.github.com>
Co-authored-by: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>
Co-authored-by: André Silva <123550+andresilva@users.noreply.github.com>
Co-authored-by: Bastian Köcher <git@kchr.de>
This commit is contained in:
Davide Galassi
2023-12-01 16:39:07 +01:00
committed by GitHub
parent 7f0beaf2a5
commit 095f4bd9ae
21 changed files with 3763 additions and 127 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/frame/sassafras/src/data/tickets-sort.md
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# Segments Incremental Sorting Strategy Empirical Results
Parameters:
- 128 segments
- segment max length 128
- 32767 random tickets ids
- epoch length 3600 (== max tickets to keep)
The table shows the comparison between the segments left in the unsorted segments buffer
and the number of new tickets which are added from the last segment to the sorted tickets
buffer (i.e. how many tickets we retain from the last processed segment)
| Segments Left | Tickets Pushed |
|-----|-----|
| 255 | 128 |
| 254 | 128 |
| 253 | 128 |
| 252 | 128 |
| 251 | 128 |
| 250 | 128 |
| 249 | 128 |
| 248 | 128 |
| 247 | 128 |
| 246 | 128 |
| 245 | 128 |
| 244 | 128 |
| 243 | 128 |
| 242 | 128 |
| 241 | 128 |
| 240 | 128 |
| 239 | 128 |
| 238 | 128 |
| 237 | 128 |
| 236 | 128 |
| 235 | 128 |
| 234 | 128 |
| 233 | 128 |
| 232 | 128 |
| 231 | 128 |
| 230 | 128 |
| 229 | 128 |
| 228 | 128 |
| 227 | 128 |
| 226 | 126 |
| 225 | 117 |
| 224 | 120 |
| 223 | 110 |
| 222 | 110 |
| 221 | 102 |
| 220 | 107 |
| 219 | 96 |
| 218 | 105 |
| 217 | 92 |
| 216 | 91 |
| 215 | 85 |
| 214 | 84 |
| 213 | 88 |
| 212 | 77 |
| 211 | 86 |
| 210 | 73 |
| 209 | 73 |
| 208 | 81 |
| 207 | 83 |
| 206 | 70 |
| 205 | 84 |
| 204 | 71 |
| 203 | 63 |
| 202 | 60 |
| 201 | 53 |
| 200 | 73 |
| 199 | 55 |
| 198 | 65 |
| 197 | 62 |
| 196 | 55 |
| 195 | 63 |
| 194 | 61 |
| 193 | 48 |
| 192 | 67 |
| 191 | 61 |
| 190 | 55 |
| 189 | 49 |
| 188 | 60 |
| 187 | 49 |
| 186 | 51 |
| 185 | 53 |
| 184 | 47 |
| 183 | 51 |
| 182 | 51 |
| 181 | 53 |
| 180 | 42 |
| 179 | 43 |
| 178 | 48 |
| 177 | 46 |
| 176 | 39 |
| 175 | 54 |
| 174 | 39 |
| 173 | 44 |
| 172 | 51 |
| 171 | 49 |
| 170 | 48 |
| 169 | 48 |
| 168 | 41 |
| 167 | 39 |
| 166 | 41 |
| 165 | 40 |
| 164 | 43 |
| 163 | 53 |
| 162 | 51 |
| 161 | 36 |
| 160 | 45 |
| 159 | 40 |
| 158 | 29 |
| 157 | 37 |
| 156 | 31 |
| 155 | 38 |
| 154 | 31 |
| 153 | 38 |
| 152 | 39 |
| 151 | 30 |
| 150 | 37 |
| 149 | 42 |
| 148 | 35 |
| 147 | 33 |
| 146 | 35 |
| 145 | 37 |
| 144 | 38 |
| 143 | 31 |
| 142 | 38 |
| 141 | 38 |
| 140 | 27 |
| 139 | 31 |
| 138 | 25 |
| 137 | 31 |
| 136 | 26 |
| 135 | 30 |
| 134 | 31 |
| 133 | 37 |
| 132 | 29 |
| 131 | 24 |
| 130 | 31 |
| 129 | 34 |
| 128 | 31 |
| 127 | 28 |
| 126 | 28 |
| 125 | 19 |
| 124 | 27 |
| 123 | 29 |
| 122 | 36 |
| 121 | 32 |
| 120 | 29 |
| 119 | 28 |
| 118 | 33 |
| 117 | 18 |
| 116 | 28 |
| 115 | 27 |
| 114 | 28 |
| 113 | 21 |
| 112 | 23 |
| 111 | 19 |
| 110 | 21 |
| 109 | 20 |
| 108 | 26 |
| 107 | 23 |
| 106 | 30 |
| 105 | 31 |
| 104 | 19 |
| 103 | 25 |
| 102 | 23 |
| 101 | 29 |
| 100 | 18 |
| 99 | 19 |
| 98 | 20 |
| 97 | 21 |
| 96 | 23 |
| 95 | 20 |
| 94 | 27 |
| 93 | 20 |
| 92 | 22 |
| 91 | 23 |
| 90 | 23 |
| 89 | 20 |
| 88 | 15 |
| 87 | 17 |
| 86 | 28 |
| 85 | 25 |
| 84 | 10 |
| 83 | 20 |
| 82 | 23 |
| 81 | 28 |
| 80 | 17 |
| 79 | 23 |
| 78 | 24 |
| 77 | 22 |
| 76 | 18 |
| 75 | 25 |
| 74 | 31 |
| 73 | 27 |
| 72 | 19 |
| 71 | 13 |
| 70 | 17 |
| 69 | 24 |
| 68 | 20 |
| 67 | 12 |
| 66 | 17 |
| 65 | 16 |
| 64 | 26 |
| 63 | 24 |
| 62 | 12 |
| 61 | 19 |
| 60 | 18 |
| 59 | 20 |
| 58 | 18 |
| 57 | 12 |
| 56 | 15 |
| 55 | 17 |
| 54 | 14 |
| 53 | 25 |
| 52 | 22 |
| 51 | 15 |
| 50 | 17 |
| 49 | 15 |
| 48 | 17 |
| 47 | 18 |
| 46 | 17 |
| 45 | 23 |
| 44 | 17 |
| 43 | 13 |
| 42 | 15 |
| 41 | 18 |
| 40 | 11 |
| 39 | 19 |
| 38 | 18 |
| 37 | 12 |
| 36 | 19 |
| 35 | 18 |
| 34 | 15 |
| 33 | 12 |
| 32 | 25 |
| 31 | 20 |
| 30 | 24 |
| 29 | 20 |
| 28 | 10 |
| 27 | 15 |
| 26 | 16 |
| 25 | 15 |
| 24 | 15 |
| 23 | 13 |
| 22 | 12 |
| 21 | 14 |
| 20 | 19 |
| 19 | 17 |
| 18 | 17 |
| 17 | 18 |
| 16 | 15 |
| 15 | 13 |
| 14 | 11 |
| 13 | 16 |
| 12 | 13 |
| 11 | 18 |
| 10 | 19 |
| 9 | 10 |
| 8 | 7 |
| 7 | 15 |
| 6 | 12 |
| 5 | 12 |
| 4 | 17 |
| 3 | 14 |
| 2 | 17 |
| 1 | 9 |
| 0 | 13
# Graph of the same data
![graph](tickets-sort.png)