view tests/test-rebase-partial.t @ 39492:a33f394b2bfd

snapshot: try intermediate snapshot against parents' base # Regarding The Series Started By This Changeset This is the first changesets of a group adjusting delta chain strategy to build a useful chain of intermediate snapshots. The series will introduce a full strategy to produce chains of multiple snapshots on top of which a "usual" delta chain will be built. That strategy will have multiple steps to maximize snapshot reuse, avoiding pathological cases and improving overall compression in very branchy repositories. An important property of sparse-revlog using such snapshot-chain is that they can use very short delta chain without problematic impact on the resulting compression. Shorter delta chains are important to achieve good performance. To make each step clear, we'll introduce them one by one. See the end of this series for full details. # Regarding This Changeset Before this change, if we cannot store the current revision as a delta against a "simple" candidate (p1, p2, prev), we created a new level-0 snapshot (also called full snapshot). As the first step, we introduce a simple strategy: try an intermediate level-1 snapshot against the chain base of the "current revision" parents. The "current revision" is the one we are currently trying to store in the revlog, triggering this search for a good delta base. The first item in the chain is always a level-0 snapshot. # Effect On The Test Repository We can already see the effect on the test-repository. Most of the snapshots have shifted from level 0 to level 1. The overall size has slightly decreased. (However, keep in mind that this repository only emulates real data) # Regarding Statistic The current series focuses on improving the chain built. Improving the performance of this logic will be done as a second step. Sparse-revlog is still experimental and disabled by default. We'll provide more statistic about resulting size and delta chain at the end of this series.
author Boris Feld <boris.feld@octobus.net>
date Fri, 07 Sep 2018 11:17:29 -0400
parents 177f3b90335f
children 5abc47d4ca6b
line wrap: on
line source

Tests rebasing with part of the rebase set already in the
destination (issue5422)

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > rebase=
  > drawdag=$TESTDIR/drawdag.py
  > 
  > [experimental]
  > evolution.createmarkers=True
  > evolution.allowunstable=True
  > 
  > [alias]
  > tglog = log -G --template "{rev}: {node|short} {desc}"
  > EOF

  $ rebasewithdag() {
  >   N=`$PYTHON -c "print($N+1)"`
  >   hg init repo$N && cd repo$N
  >   hg debugdrawdag
  >   hg rebase "$@" > _rebasetmp
  >   r=$?
  >   grep -v 'saved backup bundle' _rebasetmp
  >   [ $r -eq 0 ] && hg tglog
  >   cd ..
  >   return $r
  > }

Rebase two commits, of which one is already in the right place

  $ rebasewithdag -r C+D -d B <<EOF
  > C
  > |
  > B D
  > |/
  > A
  > EOF
  rebasing 2:b18e25de2cf5 "D" (D)
  already rebased 3:26805aba1e60 "C" (C tip)
  o  4: fe3b4c6498fa D
  |
  | o  3: 26805aba1e60 C
  |/
  | x  2: b18e25de2cf5 D
  | |
  o |  1: 112478962961 B
  |/
  o  0: 426bada5c675 A
  
Can collapse commits even if one is already in the right place

  $ rebasewithdag --collapse -r C+D -d B <<EOF
  > C
  > |
  > B D
  > |/
  > A
  > EOF
  rebasing 2:b18e25de2cf5 "D" (D)
  rebasing 3:26805aba1e60 "C" (C tip)
  o  4: a2493f4ace65 Collapsed revision
  |  * D
  |  * C
  | x  3: 26805aba1e60 C
  |/
  | x  2: b18e25de2cf5 D
  | |
  o |  1: 112478962961 B
  |/
  o  0: 426bada5c675 A
  
Abort doesn't lose the commits that were already in the right place

  $ hg init abort
  $ cd abort
  $ hg debugdrawdag <<EOF
  > C
  > |
  > B D  # B/file = B
  > |/   # D/file = D
  > A
  > EOF
  $ hg rebase -r C+D -d B
  rebasing 2:ef8c0fe0897b "D" (D)
  merging file
  warning: conflicts while merging file! (edit, then use 'hg resolve --mark')
  unresolved conflicts (see hg resolve, then hg rebase --continue)
  [1]
  $ hg rebase --abort
  rebase aborted
  $ hg tglog
  o  3: 79f6d6ab7b14 C
  |
  | o  2: ef8c0fe0897b D
  | |
  o |  1: 594087dbaf71 B
  |/
  o  0: 426bada5c675 A
  
  $ cd ..

Rebase with "holes". The commits after the hole should end up on the parent of
the hole (B below), not on top of the destination (A).

  $ rebasewithdag -r B+D -d A <<EOF
  > D
  > |
  > C
  > |
  > B
  > |
  > A
  > EOF
  already rebased 1:112478962961 "B" (B)
  rebasing 3:f585351a92f8 "D" (D tip)
  o  4: 1e6da8103bc7 D
  |
  | x  3: f585351a92f8 D
  | |
  | o  2: 26805aba1e60 C
  |/
  o  1: 112478962961 B
  |
  o  0: 426bada5c675 A