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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/25_tickets_100_auths.bin
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substrate/frame/sassafras/src/data/benchmark-results.md
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# Benchmarks High Level Results
- **Ring size**: the actual number of validators for an epoch
- **Domain size**: a value which bounds the max size of the ring (max_ring_size = domain_size - 256)
## Verify Submitted Tickets (extrinsic)
`x` = Number of tickets
### Domain=1024, Uncompressed (~ 13 ms + 11·x ms)
Time ~= 13400
+ x 11390
µs
### Domain=1024, Compressed (~ 13 ms + 11·x ms)
Time ~= 13120
+ x 11370
µs
### Domain=2048, Uncompressed (~ 26 ms + 11·x ms)
Time ~= 26210
+ x 11440
µs
### Domain=2048, Compressed (~ 26 ms + 11·x ms)
Time ~= 26250
+ x 11460
µs
### Conclusions
- Verification doesn't depend on ring size as verification key is already constructed.
- The call is fast as far as the max number of tickets which can be submitted in one shot
is appropriately bounded.
- Currently, the bound is set equal epoch length, which iirc for Polkadot is 3600.
In this case if all the tickets are submitted in one shot timing is expected to be
~39 seconds, which is not acceptable. TODO: find a sensible bound
---
## Recompute Ring Verifier Key (on epoch change)
`x` = Ring size
### Domain=1024, Uncompressed (~ 50 ms)
Time ~= 54070
+ x 98.53
µs
### Domain=1024, Compressed (~ 700 ms)
Time ~= 733700
+ x 90.49
µs
### Domain=2048, Uncompressed (~ 100 ms)
Time ~= 107700
+ x 108.5
µs
### Domain=2048, Compressed (~ 1.5 s)
Time ~= 1462400
+ x 65.14
µs
### Conclusions
- Here we load the full ring context data to recompute verification key for the epoch
- Ring size influence is marginal (e.g. for 1500 validators → ~98 ms to be added to the base time)
- This step is performed at most once per epoch (if validator set changes).
- Domain size for ring context influence the PoV size (see next paragraph)
- Decompression heavily influence timings (1.5sec vs 100ms for same domain size)
---
## Ring Context Data Size
### Domain=1024, Uncompressed
295412 bytes = ~ 300 KiB
### Domain=1024, Compressed
147716 bytes = ~ 150 KiB
### Domain=2048, Uncompressed
590324 bytes = ~ 590 KiB
### Domain=2048, Compressed
295172 bytes = ~ 300 KiB
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)
substrate/frame/sassafras/src/data/tickets-sort.png
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