view tests/test-remotefilelog-push-pull.t @ 42743:8c9a6adec67a

rust-discovery: using the children cache in add_missing

The DAG range computation often needs to get back to very old
revisions, and turns out to be disproportionately long, given
that the end goal is to remove the descendents of the given
missing revisons from the undecided set.

The fast iteration capabilities available in the Rust case make
it possible to avoid the DAG range entirely, at the cost of
precomputing the children cache, and to simply iterate on
children of the given missing revisions.

This is a case where staying on the same side of the interface
between the two languages has clear benefits.

On discoveries with initial undecided sets
small enough to bypass sampling entirely, the total cost of
computing the children cache and the subsequent iteration
becomes better than the Python + C counterpart, which relies on
reachableroots2.

For example, on a repo with more than one million revisions with
an initial undecided set of 11 elements, we get these figures:

Rust version with simple iteration
  addcommons: 57.287us
  first undecided computation: 184.278334ms
  first children cache computation: 131.056us
  addmissings iteration: 42.766us
  first addinfo total: 185.24 ms

Python + C version
  first addcommons: 0.29 ms
  addcommons 0.21 ms
  first undecided computation 191.35 ms
  addmissings 45.75 ms
  first addinfo total: 237.77 ms

On discoveries with large undecided sets, the initial price paid
makes the first addinfo slower than the Python + C version,
but that's more than compensated by the gain in sampling and
subsequent iterations.
Here's an extreme example with an undecided set of a million revisions:

Rust version:
  first undecided computation: 293.842629ms
  first children cache computation: 407.911297ms
  addmissings iteration: 34.312869ms
  first addinfo total: 776.02 ms
  taking initial sample
  query 2: sampling time: 1318.38 ms
  query 2; still undecided: 1005013, sample size is: 200
  addmissings: 143.062us

Python + C version:
  first undecided computation 298.13 ms
  addmissings 80.13 ms
  first addinfo total: 399.62 ms
  taking initial sample
  query 2: sampling time: 3957.23 ms
  query 2; still undecided: 1005013, sample size is: 200
  addmissings 52.88 ms

Differential Revision: https://phab.mercurial-scm.org/D6428

#require no-windows

  $ . "$TESTDIR/remotefilelog-library.sh"

  $ hg init master
  $ cd master
  $ cat >> .hg/hgrc <<EOF
  > [remotefilelog]
  > server=True
  > EOF
  $ echo x > x
  $ hg commit -qAm x

  $ cd ..

  $ hgcloneshallow ssh://user@dummy/master shallow -q
  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)
  $ hgcloneshallow ssh://user@dummy/master shallow2 -q

We should see the remotefilelog capability here, which advertises that
the server supports our custom getfiles method.

  $ cd master
  $ echo 'hello' | hg -R . serve --stdio | grep capa | identifyrflcaps
  exp-remotefilelog-ssh-getfiles-1
  x_rfl_getfile
  x_rfl_getflogheads
  $ echo 'capabilities' | hg -R . serve --stdio | identifyrflcaps ; echo
  exp-remotefilelog-ssh-getfiles-1
  x_rfl_getfile
  x_rfl_getflogheads
  
# pull to shallow from full

  $ echo y > y
  $ hg commit -qAm y

  $ cd ../shallow
  $ hg pull
  pulling from ssh://user@dummy/master
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 0 changes to 0 files
  new changesets d34c38483be9
  (run 'hg update' to get a working copy)

  $ hg up
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)

  $ cat y
  y

  $ cd ..

# pull from shallow to shallow (local)

  $ cd shallow
  $ echo z > z
  $ hg commit -qAm z
  $ echo x >> x
  $ echo y >> y
  $ hg commit -qAm xxyy
  $ cd ../shallow2
  $ clearcache
  $ hg pull ../shallow
  pulling from ../shallow
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 4 changes to 3 files
  new changesets d34c38483be9:d7373980d475 (2 drafts)
  (run 'hg update' to get a working copy)
  2 files fetched over 2 fetches - (2 misses, 0.00% hit ratio) over *s (glob)

# pull from shallow to shallow (ssh)

  $ hg strip -r 1
  saved backup bundle to $TESTTMP/shallow2/.hg/strip-backup/d34c38483be9-89d325c9-backup.hg (glob)
  $ hg pull ssh://user@dummy/$TESTTMP/shallow --config remotefilelog.cachepath=${CACHEDIR}2
  pulling from ssh://user@dummy/$TESTTMP/shallow
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 3 changesets with 4 changes to 3 files
  new changesets d34c38483be9:d7373980d475 (2 drafts)
  (run 'hg update' to get a working copy)
  1 files fetched over 1 fetches - (1 misses, 0.00% hit ratio) over *s (glob)

  $ hg up
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat z
  z

  $ hg -R ../shallow strip -qr 3
  $ hg strip -qr 3
  $ cd ..

# push from shallow to shallow

  $ cd shallow
  $ echo a > a
  $ hg commit -qAm a
  $ hg push ssh://user@dummy/$TESTTMP/shallow2
  pushing to ssh://user@dummy/$TESTTMP/shallow2
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 1 changesets with 1 changes to 1 files

  $ cd ../shallow2
  $ hg up
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat a
  a

# verify files are read-only

  $ ls -l .hg/store/data
  total * (glob)
  drwxrwxr-x* 11f6ad8ec52a2984abaafd7c3b516503785c2072 (glob)
  drwxrwxr-x* 395df8f7c51f007019cb30201c49e884b46b92fa (glob)
  drwxrwxr-x* 86f7e437faa5a7fce15d1ddcb9eaeaea377667b8 (glob)
  drwxrwxr-x* 95cb0bfd2977c761298d9624e4b4d4c72a39974a (glob)
  $ ls -l .hg/store/data/395df8f7c51f007019cb30201c49e884b46b92fa
  total * (glob)
  -r--r--r--* 69a1b67522704ec122181c0890bd16e9d3e7516a (glob)
  -r--r--r--* 69a1b67522704ec122181c0890bd16e9d3e7516a_old (glob)
  $ cd ..

# push from shallow to full

  $ cd shallow
  $ hg push
  pushing to ssh://user@dummy/master
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 2 changesets with 2 changes to 2 files

  $ cd ../master
  $ hg log -l 1 --style compact
  3[tip]   1489bbbc46f0   1970-01-01 00:00 +0000   test
    a
  
  $ hg up
  2 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ cat a
  a

# push public commits

  $ cd ../shallow
  $ echo p > p
  $ hg commit -qAm p
  $ hg phase -f -p -r .
  $ echo d > d
  $ hg commit -qAm d

  $ cd ../shallow2
  $ hg pull ../shallow
  pulling from ../shallow
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 3a2e32c04641:cedeb4167c1f (1 drafts)
  2 local changesets published (?)
  (run 'hg update' to get a working copy)

  $ cd ..

# Test pushing from shallow to shallow with multiple manifests introducing the
# same filenode. Test this by constructing two separate histories of file 'c'
# that share a file node and verifying that the history works after pushing.

  $ hg init multimf-master
  $ hgcloneshallow ssh://user@dummy/multimf-master multimf-shallow -q
  $ hgcloneshallow ssh://user@dummy/multimf-master multimf-shallow2 -q
  $ cd multimf-shallow
  $ echo a > a
  $ hg commit -qAm a
  $ echo b > b
  $ hg commit -qAm b
  $ echo c > c
  $ hg commit -qAm c1
  $ hg up -q 0
  $ echo c > c
  $ hg commit -qAm c2
  $ echo cc > c
  $ hg commit -qAm c22
  $ hg log -G -T '{rev} {desc}\n'
  @  4 c22
  |
  o  3 c2
  |
  | o  2 c1
  | |
  | o  1 b
  |/
  o  0 a
  

  $ cd ../multimf-shallow2
- initial commit to prevent hg pull from being a clone
  $ echo z > z && hg commit -qAm z
  $ hg pull -f ssh://user@dummy/$TESTTMP/multimf-shallow
  pulling from ssh://user@dummy/$TESTTMP/multimf-shallow
  searching for changes
  warning: repository is unrelated
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 5 changesets with 4 changes to 3 files (+2 heads)
  new changesets cb9a9f314b8b:d8f06a4c6d38 (5 drafts)
  (run 'hg heads' to see heads, 'hg merge' to merge)

  $ hg up -q 5
  $ hg log -f -T '{rev}\n' c
  5
  4