Here is a re-formatted version of the tables I introduced earlier. The tables were too wide for public-inbox to render correctly (when paired with my email client). Hopefully this bulleted-list format works better. Thanks, Stefan, for pointing out the rendering problems!
### Test 1: `git log --topo-order -N` This test focuses on the number of commits that are parsed during a `git log --topo-order` before writing `N` commits to output. You can reproduce this test using `topo-order-tests.sh` and see all the data in `topo-order-summary.txt`. The values reported here are a sampling of the data, ignoring tests where all values were the same or extremely close in value. android-base, N = 100 V0: 5487 V1: 8534 V2: 6937 V3: 6419 V4: 6453 android-base, N = 1000 V0: 36029 V1: 44030 V2: 41493 V3: 41206 V4: 45431 chromium, N = 100 V0: 101 V1: 424406 V2: 101 V3: 101 V4: 101 gerrit, N = 100 V0: 8212 V1: 8533 V2: 164 V3: 159 V4: 162 gerrit, N = 1000 V0: 8512 V1: 8533 V2: 1990 V3: 1973 V4: 3766 Linux, N = 100 V0: 12458 V1: 12444 V2: 13683 V3: 13123 V4: 13124 Linux, N = 1000 V0: 24436 V1: 26247 V2: 27878 V3: 26430 V4: 27875 Linux, N = 10000 V0: 30364 V1: 28891 V2: 27878 V3: 26430 V4: 27875 electron, N = 1000 V0: 19927 V1: 18733 V2: 1072 V3: 18214 V4: 18214 Ffmpeg, N = 10000 V0: 32154 V1: 47429 V2: 10435 V3: 11054 V4: 11054 jgit, N = 1000 V0: 1550 V1: 6264 V2: 1067 V3: 1060 V4: 1233 julia, N = 10000 V0: 43043 V1: 43043 V2: 10201 V3: 23505 V4: 23828 odoo, N = 1000 V0: 17175 V1: 9714 V2: 4043 V3: 4046 V4: 4111 php-src, N = 1000 V0: 19014 V1: 27530 V2: 1311 V3: 1305 V4: 1320 rails, N = 100 V0: 1420 V1: 2041 V2: 1757 V3: 1428 V4: 1441 rails, N = 1000 V0: 7952 V1: 10145 V2: 10053 V3: 8373 V4: 8373 swift, N = 1000 V0: 1914 V1: 4004 V2: 2071 V3: 1939 V4: 1940 tensorflow, N = 1000 V0: 10019 V1: 39221 V2: 6711 V3: 10051 V4: 10051 TypeScript, N = 1000 V0: 2873 V1: 12014 V2: 3049 V3: 2876 V4: 2876 ### Test 2: `git log --topo-order -10 A..B` This test focuses on the number of commits that are parsed during a `git log --topo-order A..B` before writing ten commits to output. Since we fix a very small set of output commits, we care more about the part of the walk that determines which commits are reachable from `B` but not reachable from `A`. This part of the walk uses commit date as a heuristic in the existing implementation. You can reproduce this test using `topo-compare-tests.sh` and see all the data in `topo-compare-summary.txt`. The values reported here are a sampling of the data, ignoring tests where all values were the same or extremely close in value. _Note:_ For some of the rows, the `A` and `B` values may be swapped from what is expected. This is due to (1) a bug in the reference implementation that doesn't short-circuit the walk when `A` can reach `B`, and (2) data-entry errors by the author. The bug can be fixed, but would have introduced strange-looking rows in this table. android-base 53c1972bc8f 92f18ac3e39 OLD: 39403 V0: 1544 V1: 6957 V2: 26 V3: 1015 V4: 1098 gerrit c4311f7642 777a8cd1e0 OLD: 6457 V0: 7836 V1: 10869 V2: 415 V3: 414 V4: 445 electron 7da7dd85e addf069f2 OLD: 18164 V0: 945 V1: 6528 V2: 17 V3: 17 V4: 18 julia 7faee1b201 e2022b9f0f OLD: 22800 V0: 4221 V1: 12710 V2: 377 V3: 213 V4: 213 julia ae69259cd9 c8b5402afc OLD: 1864 V0: 1859 V1: 13287 V2: 12 V3: 1859 V4: 1859 Linux 69973b830859 c470abd4fde4 OLD: 111692 V0: 77263 V1: 96598 V2: 80238 V3: 76332 V4: 76495 Linux c3b92c878736 19f949f52599 OLD: 167418 V0: 5736 V1: 4684 V2: 9675 V3: 3887 V4: 3923 Linux c8d2bc9bc39e 69973b830859 OLD: 44940 V0: 4056 V1: 16636 V2: 10405 V3: 3475 V4: 4022 odoo 4a31f55d0a0 93fb2b4a616 OLD: 25139 V0: 19528 V1: 20418 V2: 19874 V3: 19634 V4: 27247 swift 4046359efd b34b6a14c7 OLD: 13411 V0: 662 V1: 321 V2: 12 V3: 80 V4: 134 tensorflow ec6d17219c fa1db5eb0d OLD: 10373 V0: 4762 V1: 36272 V2: 174 V3: 3631 V4: 3632 TypeScript 35ea2bea76 123edced90 OLD: 3450 V0: 267 V1: 10386 V2: 27 V3: 259 V4: 259 ### Test 3: `git merge-base A B` This test focuses on the number of commits that are parsed during a `git merge-base A B`. This part of the walk uses commit date as a heuristic in the existing implementation. You can reproduce this test using `merge-base-tests.sh` and see all the data in `merge-base-summary.txt`. The values reported here are a sampling of the data, ignoring tests where all values were the same or extremely close in value. android-base 53c1972bc8f 92f18ac3e39 OLD: 81999 V0: 109025 V1: 81885 V2: 77475 V3: 81999 V4: 82001 gerrit c4311f7642 777a8cd1e0 OLD: 6468 V0: 7995 V1: 6566 V2: 6478 V3: 6468 V4: 6468 electron 7da7dd85e addf069f2 OLD: 18160 V0: 19871 V1: 18670 V2: 2231 V3: 18160 V4: 18160 julia 7faee1b201 e2022b9f0f OLD: 22803 V0: 42339 V1: 42212 V2: 6803 V3: 22803 V4: 22803 julia c8b5402afc ae69259cd9 OLD: 7076 V0: 42909 V1: 42770 V2: 2690 V3: 7076 V4: 7076 Linux 69973b830859 c470abd4fde4 OLD: 44984 V0: 47457 V1: 44679 V2: 38461 V3: 44984 V4: 44984 Linux c3b92c878736 19f949f52599 OLD: 111740 V0: 111027 V1: 111196 V2: 107835 V3: 111771 V4: 111368 Linux c8d2bc9bc39e 69973b830859 OLD: 167468 V0: 635579 V1: 630138 V2: 33716 V3: 167496 V4: 153774 odoo 4a31f55d0a0 93fb2b4a616 OLD: 25150 V0: 27259 V1: 23977 V2: 24041 V3: 23974 V4: 26829 swift 4046359efd b34b6a14c7 OLD: 13434 V0: 13254 V1: 13940 V2: 16023 V3: 13127 V4: 15008 tensorflow ec6d17219c fa1db5eb0d OLD: 10377 V0: 10448 V1: 10377 V2: 8460 V3: 10377 V4: 10377 TypeScript 35ea2bea76 123edced90 OLD: 3464 V0: 3439 V1: 3464 V2: 3581 V3: 3464 V4: 3464
