[Tile-serving] [osm2pgsql-dev/osm2pgsql] Add grouped-linemerge generalization (PR #2482)

[leijurv]

leijurv left a comment (osm2pgsql-dev/osm2pgsql#2482)

Here is an updated table. I restarted postgres between each run, and I used drop_caches as well. It is several times slower which is probably what you expected?

| expired tile  | region | walk | collect | delete | insert |  total |
|---------------|--------|------|---------|--------|--------|--------|
| z13  |     74 |  267 |      42 |    206 |     53 | 642 ms |
| z14           |     66 |  176 |      20 |     95 |     23 | 382 ms |
| z15           |     85 |   96 |       9 |     53 |     16 | 259 ms |
| z16           |     73 |   76 |       6 |     41 |     16 | 212 ms |
| z17           |     65 |   58 |       6 |     29 |      6 | 164 ms |
| z18 |     69 |   55 |       6 |     28 |      6 | 165 ms |
| z19           |     67 |   54 |       7 |     28 |      5 | 161 ms |
| z20  |     71 |   60 |       9 |     27 |      8 | 175 ms |


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