view tests/test-sidedata.t @ 51250:1b23aaf5eb7b

rust-index: optimize find_gca_candidates() on less than 8 revisions

This is expected to be by far the most common case, given that, e.g.,
merging involves using it on two revisions.

Using a `u8` as support for the bitset obviously divides the amount of
RAM needed by 8. To state the obvious, on a repository with 10 million
changesets, this spares 70MB. It is also possible that it'd be slightly
faster, because it is easier to allocate and provides better cache locality.

It is possible that some exhaustive listing of the traits implemented by
`u8` and `u64` would avoid the added duplication, but that can be done later
and would need a replacement for the `MAX` consts.

==========================================================
Test file dedicated to checking side-data related behavior
==========================================================

Check data can be written/read from sidedata
============================================

  $ cat << EOF >> $HGRCPATH
  > [extensions]
  > testsidedata=$TESTDIR/testlib/ext-sidedata.py
  > EOF

  $ hg init test-sidedata --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data
  $ cd test-sidedata
  $ echo aaa > a
  $ hg add a
  $ hg commit -m a --traceback
  $ echo aaa > b
  $ hg add b
  $ hg commit -m b
  $ echo xxx >> a
  $ hg commit -m aa

  $ hg debugsidedata -c 0
  2 sidedata entries
   entry-0001 size 4
   entry-0002 size 32
  $ hg debugsidedata -c 1 -v
  2 sidedata entries
   entry-0001 size 4
    '\x00\x00\x006'
   entry-0002 size 32
    '\x98\t\xf9\xc4v\xf0\xc5P\x90\xf7wRf\xe8\xe27e\xfc\xc1\x93\xa4\x96\xd0\x1d\x97\xaaG\x1d\xd7t\xfa\xde'
  $ hg debugsidedata -m 2
  2 sidedata entries
   entry-0001 size 4
   entry-0002 size 32
  $ hg debugsidedata a  1
  2 sidedata entries
   entry-0001 size 4
   entry-0002 size 32

  $ hg debug-revlog-index --verbose -c
     rev   rank linkrev       nodeid p1-rev    p1-nodeid p2-rev    p2-nodeid            full-size delta-base flags comp-mode          data-offset chunk-size sd-comp-mode      sidedata-offset sd-chunk-size
       0     -1       0 7049e48789d7     -1 000000000000     -1 000000000000                   54          0     0         0                    0         54        plain                    0            90
       1     -1       1 2707720c6597      0 7049e48789d7     -1 000000000000                   54          1     0         0                   54         54        plain                   90            90
       2     -1       2 40f977031323      1 2707720c6597     -1 000000000000                   55          2     0         0                  108         55        plain                  180            90

  $ hg debug-revlog-index --verbose -m
     rev   rank linkrev       nodeid p1-rev    p1-nodeid p2-rev    p2-nodeid            full-size delta-base flags comp-mode          data-offset chunk-size sd-comp-mode      sidedata-offset sd-chunk-size
       0     -1       0 b85d294330e3     -1 000000000000     -1 000000000000                   43          0     0         0                    0         43        plain                    0            90
       1     -1       1 1a0aec305c63      0 b85d294330e3     -1 000000000000                   86          0     0         0                   43         55        plain                   90            90
       2     -1       2 104258a4f75f      1 1a0aec305c63     -1 000000000000                   86          1     0         0                   98         55        plain                  180            90

Check upgrade behavior
======================

Right now, sidedata has not upgrade support

Check that we can upgrade to sidedata
-------------------------------------

  $ hg init up-no-side-data --config experimental.revlogv2=no
  $ hg debugformat -v -R up-no-side-data | grep -E 'changelog-v2|revlog-v2'
  revlog-v2:           no     no      no
  changelog-v2:        no     no      no
  $ hg debugformat -v -R up-no-side-data --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data | grep -E 'changelog-v2|revlog-v2'
  revlog-v2:           no    yes      no
  changelog-v2:        no     no      no
  $ hg debugupgraderepo -R up-no-side-data --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data > /dev/null

Check that we can downgrade from sidedata
-----------------------------------------

  $ hg init up-side-data --config experimental.revlogv2=enable-unstable-format-and-corrupt-my-data
  $ hg debugformat -v -R up-side-data | grep -E 'changelog-v2|revlog-v2'
  revlog-v2:          yes     no      no
  changelog-v2:        no     no      no
  $ hg debugformat -v -R up-side-data --config experimental.revlogv2=no | grep -E 'changelog-v2|revlog-v2'
  revlog-v2:          yes     no      no
  changelog-v2:        no     no      no
  $ hg debugupgraderepo -R up-side-data --config experimental.revlogv2=no > /dev/null