Mercurial > evolve
changeset 4838:bc0ea7666d4d
stablerange: add some data from field testing
This show that in number of stable range to track stay reasonable.
| author | Pierre-Yves David <pierre-yves.david@octobus.net> |
|---|---|
| date | Sun, 08 Sep 2019 21:24:45 +0200 |
| parents | b59231359479 |
| children | 485a9f3490c9 |
| files | hgext3rd/evolve/stablerange.py |
| diffstat | 1 files changed, 123 insertions(+), 1 deletions(-) [+] |
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--- a/hgext3rd/evolve/stablerange.py Sun Sep 08 17:50:48 2019 +0200 +++ b/hgext3rd/evolve/stablerange.py Sun Sep 08 21:24:45 2019 +0200 @@ -180,7 +180,8 @@ but in practice the impact stay limited. The total number of standard subranges stay under control with about -`O(log2(N))` new stable range introduced for each new revision. +`O(log2(N))` new stable range introduced for each new revision. In practice the +total number of stableranges we have is about `O(length(repo))` In addition, it is worth nothing that the head of the extra ranges we have to use will match the destination of the "jump" cached by the stablesort @@ -225,6 +226,127 @@ algorithm should give much faster performance. Combined with commit-time computation and exchange over the network, the overall impact of this should be invisible to the user. + +The stable range is currently successfully used in production for 2 use cases: +* obsolescence markers discovery, +* caching precomputed bundle while serving pulls + +practical data +-------------- + +The evolve repository: + + number of revisions: 4833 + number of heads: 15 + number of merge: 612 ( 12%) + number of range: 4826 + with 2 subranges: 4551 ( 94%) + with 3 subranges: 255 ( 5%) + with 4 subranges: 12 ( 0%) + with 5 subranges: 7 ( 0%) + with 8 subranges: 1 ( 0%) + average range/revs: 0.99 + + Estimated approximative size of a naive compact storage: + 41 056 bytes + Current size of the sqlite cache (for comparison): + 5 312 512 bytes + +The mercurial repository: + + number of revisions: 42849 + number of heads: 2 + number of merge: 2647 ( 6%) + number of range: 41279 + with 2 subranges: 39740 ( 96%) + with 3 subranges: 1494 ( 3%) + with 4 subranges: 39 ( 0%) + with 5 subranges: 5 ( 0%) + with 7 subranges: 1 ( 0%) + average range/revs: 0.96 + Estimated approximative size of a naive compact storage: + 342 968 bytes + Current size of the sqlite cache (for comparison): + 62 803 968 bytes + +The pypy repository (very brancy history): + + number of revisions: 97409 + number of heads: 183 + number of merge: 8371 ( 8%) + number of range: 107025 + with 2 subranges: 100166 ( 93%) + with 3 subranges: 5839 ( 5%) + with 4 subranges: 605 ( 0%) + with 5 subranges: 189 ( 0%) + with 6 subranges: 90 ( 0%) + with 7 subranges: 38 ( 0%) + with 8 subranges: 18 ( 0%) + with 9 subranges: 9 ( 0%) + with 10 subranges: 15 ( 0%) + with 11 subranges: 4 ( 0%) + with 12 subranges: 6 ( 0%) + with 13 subranges: 7 ( 0%) + with 14 subranges: 6 ( 0%) + with 15 subranges: 1 ( 0%) + with 16 subranges: 2 ( 0%) + with 17 subranges: 2 ( 0%) + with 18 subranges: 3 ( 0%) + with 19 subranges: 2 ( 0%) + with 20 subranges: 3 ( 0%) + with 25 subranges: 1 ( 0%) + with 27 subranges: 1 ( 0%) + with 31 subranges: 3 ( 0%) + with 32 subranges: 2 ( 0%) + with 33 subranges: 1 ( 0%) + with 35 subranges: 1 ( 0%) + with 43 subranges: 1 ( 0%) + with 44 subranges: 1 ( 0%) + with 45 subranges: 2 ( 0%) + with 47 subranges: 1 ( 0%) + with 51 subranges: 1 ( 0%) + with 52 subranges: 1 ( 0%) + with 57 subranges: 1 ( 0%) + with 65 subranges: 1 ( 0%) + with 73 subranges: 1 ( 0%) + with 79 subranges: 1 ( 0%) + average range/revs: 1.10 + Estimated approximative size of a naive compact storage: + 934 176 bytes + Current size of the sqlite cache (for comparison): + 201 236 480 bytes + +A private and branchy repository: + + number of revisions: 605011 + number of heads: 14061 + number of merge: 118109 ( 19%) + number of range: 747625 + with 2 subranges: 595985 ( 79%) + with 3 subranges: 130196 ( 17%) + with 4 subranges: 14093 ( 1%) + with 5 subranges: 4090 ( 0%) + with 6 subranges: 741 ( 0%) + with 7 subranges: 826 ( 0%) + with 8 subranges: 1313 ( 0%) + with 9 subranges: 83 ( 0%) + with 10 subranges: 22 ( 0%) + with 11 subranges: 9 ( 0%) + with 12 subranges: 26 ( 0%) + with 13 subranges: 5 ( 0%) + with 14 subranges: 9 ( 0%) + with 15 subranges: 3 ( 0%) + with 16 subranges: 212 ( 0%) + with 18 subranges: 6 ( 0%) + with 19 subranges: 3 ( 0%) + with 24 subranges: 1 ( 0%) + with 27 subranges: 1 ( 0%) + with 32 subranges: 1 ( 0%) + average range/revs: 1.23 + Estimated approximative size of a naive compact storage: + 7 501 928 bytes + Current size of the sqlite cache (for comparison): + 1 950 310 400 bytes """ import abc