view tests/test-notify-changegroup.t @ 44363:f7459da77f23

nodemap: introduce an option to use mmap to read the nodemap mapping

The performance and memory benefit is much greater if we don't have to copy all
the data in memory for each information. So we introduce an option (on by
default) to read the data using mmap.

This changeset is the last one definition the API for index support nodemap
data. (they have to be able to use the mmaping).

Below are some benchmark comparing the best we currently have in 5.3 with the
final step of this series (using the persistent nodemap implementation in
Rust). The benchmark run `hg perfindex` with various revset and the following
variants:

Before:

 * do not use the persistent nodemap
 * use the CPython implementation of the index for nodemap
 * use mmapping of the changelog index

After:

 * use the MixedIndex Rust code, with the NodeTree object for nodemap access
   (still in review)
 * use the persistent nodemap data from disk
 * access the persistent nodemap data through mmap
 * use mmapping of the changelog index

The persistent nodemap greatly speed up  most operation on very large
repositories. Some of the previously very fast lookup end up a bit slower because
the persistent nodemap has to be setup. However the absolute slowdown is very
small and won't matters in the big picture.

Here are some numbers (in seconds) for the reference copy of mozilla-try:

Revset            Before   After     abs-change speedup

-10000:           0.004622 0.005532   0.000910  ×   0.83
-10:              0.000050 0.000132   0.000082  ×   0.37
tip               0.000052 0.000085   0.000033  ×   0.61
0 + (-10000:)     0.028222 0.005337  -0.022885  ×   5.29
0                 0.023521 0.000084  -0.023437  × 280.01
(-10000:) + 0     0.235539 0.005308  -0.230231  ×  44.37
(-10:) + :9       0.232883 0.000180  -0.232703  ×1293.79
(-10000:) + (:99) 0.238735 0.005358  -0.233377  ×  44.55
:99 + (-10000:)   0.317942 0.005593  -0.312349  ×  56.84
:9 + (-10:)       0.313372 0.000179  -0.313193  ×1750.68
:9                0.316450 0.000143  -0.316307  ×2212.93


On smaller repositories, the cost of nodemap related operation is not as big, so
the win is much more modest. Yet it helps shaving a handful of millisecond here
and there.

Here are some numbers (in seconds) for the reference copy of mercurial:

Revset            Before   After     abs-change speedup
-10:              0.000065 0.000097   0.000032  × 0.67
tip               0.000063 0.000078   0.000015  × 0.80
0                 0.000561 0.000079  -0.000482  × 7.10
-10000:           0.004609 0.003648  -0.000961  × 1.26
0 + (-10000:)     0.005023 0.003715  -0.001307  × 1.35
(-10:) + :9       0.002187 0.000108  -0.002079  ×20.25
(-10000:) + 0     0.006252 0.003716  -0.002536  × 1.68
(-10000:) + (:99) 0.006367 0.003707  -0.002660  × 1.71
:9 + (-10:)       0.003846 0.000110  -0.003736  ×34.96
:9                0.003854 0.000099  -0.003755  ×38.92
:99 + (-10000:)   0.007644 0.003778  -0.003866  × 2.02

Differential Revision: https://phab.mercurial-scm.org/D7894

  $ cat <<EOF >> $HGRCPATH
  > [extensions]
  > notify=
  > 
  > [hooks]
  > changegroup.notify = python:hgext.notify.hook
  > 
  > [notify]
  > sources = push
  > diffstat = False
  > maxsubject = 10
  > 
  > [usersubs]
  > foo@bar = *
  > 
  > [reposubs]
  > * = baz
  > EOF
  $ hg init a

clone

  $ hg --traceback clone a b
  updating to branch default
  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo a > b/a

commit

  $ hg --traceback --cwd b commit -Ama
  adding a
  $ echo a >> b/a

commit

  $ hg --traceback --cwd b commit -Amb

push

  $ hg --traceback --cwd b push ../a 2>&1 |
  >     "$PYTHON" $TESTDIR/unwrap-message-id.py | \
  >     "$PYTHON" -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
  pushing to ../a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files
  MIME-Version: 1.0
  Content-Type: text/plain; charset="us-ascii"
  Content-Transfer-Encoding: 7bit
  Date: * (glob)
  Subject: * (glob)
  From: test
  X-Hg-Notification: changeset cb9a9f314b8b
  Message-Id: <*> (glob)
  To: baz, foo@bar
  
  changeset cb9a9f314b8b in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=cb9a9f314b8b
  summary: a
  
  changeset ba677d0156c1 in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=ba677d0156c1
  summary: b
  
  diffs (6 lines):
  
  diff -r 000000000000 -r ba677d0156c1 a
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,2 @@
  +a
  +a
  $ hg --cwd a rollback
  repository tip rolled back to revision -1 (undo push)

unbundle with unrelated source

  $ hg --cwd b bundle ../test.hg ../a
  searching for changes
  2 changesets found
  $ hg --cwd a unbundle ../test.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files
  new changesets cb9a9f314b8b:ba677d0156c1 (2 drafts)
  (run 'hg update' to get a working copy)
  $ hg --cwd a rollback
  repository tip rolled back to revision -1 (undo unbundle)

unbundle with correct source

  $ hg --config notify.sources=unbundle --cwd a unbundle ../test.hg 2>&1 |
  >     "$PYTHON" $TESTDIR/unwrap-message-id.py | \
  >     "$PYTHON" -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 1 files
  new changesets cb9a9f314b8b:ba677d0156c1 (2 drafts)
  MIME-Version: 1.0
  Content-Type: text/plain; charset="us-ascii"
  Content-Transfer-Encoding: 7bit
  Date: * (glob)
  Subject: * (glob)
  From: test
  X-Hg-Notification: changeset cb9a9f314b8b
  Message-Id: <*> (glob)
  To: baz, foo@bar
  
  changeset cb9a9f314b8b in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=cb9a9f314b8b
  summary: a
  
  changeset ba677d0156c1 in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=ba677d0156c1
  summary: b
  
  diffs (6 lines):
  
  diff -r 000000000000 -r ba677d0156c1 a
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/a	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,2 @@
  +a
  +a
  (run 'hg update' to get a working copy)

Check that using the first committer as the author of a changeset works:
Check that the config option works.
Check that the first committer is indeed used for "From:".
Check that the merge user is NOT used for "From:"

Create new file

  $ echo a > b/b
  $ echo b >> b/b
  $ echo c >> b/b
  $ hg --traceback --cwd b commit -Amnewfile -u committer_1
  adding b

commit as one user

  $ echo x > b/b
  $ echo b >> b/b
  $ echo c >> b/b
  $ hg --traceback --cwd b commit -Amx -u committer_2

commit as other user, change file so we can do an (automatic) merge

  $ hg --cwd b up 2
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ echo a > b/b
  $ echo b >> b/b
  $ echo y >> b/b
  $ hg --traceback --cwd b commit -Amy -u committer_3
  created new head

merge as a different user

  $ hg --cwd b merge --config notify.fromauthor=True
  merging b
  0 files updated, 1 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)

  $ hg --traceback --cwd b commit -Am "merged"

push

  $ hg --traceback --cwd b --config notify.fromauthor=True push ../a 2>&1 |
  >     "$PYTHON" $TESTDIR/unwrap-message-id.py | \
  >     "$PYTHON" -c 'from __future__ import print_function ; import sys,re; print(re.sub("\n\t", " ", sys.stdin.read()), end="")'
  pushing to ../a
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 4 changesets with 4 changes to 1 files
  MIME-Version: 1.0
  Content-Type: text/plain; charset="us-ascii"
  Content-Transfer-Encoding: 7bit
  Date: * (glob)
  Subject: * (glob)
  From: committer_1
  X-Hg-Notification: changeset 84e487dddc58
  Message-Id: <*> (glob)
  To: baz, foo@bar
  
  changeset 84e487dddc58 in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=84e487dddc58
  summary: newfile
  
  changeset b29c7a2b6b0c in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=b29c7a2b6b0c
  summary: x
  
  changeset 0957c7d64886 in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=0957c7d64886
  summary: y
  
  changeset 485b4e6b0249 in $TESTTMP/a
  details: $TESTTMP/a?cmd=changeset;node=485b4e6b0249
  summary: merged
  
  diffs (7 lines):
  
  diff -r ba677d0156c1 -r 485b4e6b0249 b
  --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
  +++ b/b	Thu Jan 01 00:00:00 1970 +0000
  @@ -0,0 +1,3 @@
  +x
  +b
  +y
  $ hg --cwd a rollback
  repository tip rolled back to revision 1 (undo push)