changegroup: compute seen files as changesets are added (
issue4750)
Before this patch, addchangegroup() would walk the changelog and compute
the set of seen files between applying changesets and applying
manifests. When cloning large repositories such as mozilla-central,
this consumed a non-trivial amount of time. On my MBP, this walk takes
~10s. On a dainty EC2 instance, this was measured to take ~125s! On the
latter machine, this delay was enough for the Mercurial server to
disconnect the client, thinking it had timed out, thus causing a clone
to abort.
This patch enables the changelog to compute the set of changed files as
new revisions are added. By doing so, we:
* avoid a potentially heavy computation between changelog and manifest
processing by spreading the computation across all changelog additions
* avoid extra reads from the changelog by operating on the data as it is
added
The downside of this is that the add revision callback does result in
extra I/O. Before, we would perform a flush (and subsequent read to
construct the full revision) when new delta chains were created. For
changelogs, this is typically every 2-4 revisions. Using the callback
guarantees there will be a flush after every added revision *and* an
open + read of the changelog to obtain the full revision in order to
read the added files. So, this increases the frequency of these
operations by the average chain length. In the future, the revlog
should be smart enough to know how to read revisions that haven't been
flushed yet, thus eliminating this extra I/O.
On my MBP, the total CPU times for an `hg unbundle` with a local
mozilla-central gzip bundle containing 251,934 changesets and 211,065
files did not have a statistically significant change with this patch,
holding steady around 360s. So, the increased revlog flushing did not
have an effect.
With this patch, there is no longer a visible pause between applying
changeset and manifest data. Before, it sure felt like Mercurial was
lethargic making this transition. Now, the transition is nearly
instantaneous, giving the impression that Mercurial is faster. Of course,
eliminating this pause means that the potential for network disconnect due
to channel inactivity during the changelog walk is eliminated as well.
And that is the impetus behind this change.
$ hg init
no bookmarks
$ hg bookmarks
no bookmarks set
$ hg bookmarks -Tjson
[
]
bookmark rev -1
$ hg bookmark X
list bookmarks
$ hg bookmarks
* X -1:000000000000
list bookmarks with color
$ hg --config extensions.color= --config color.mode=ansi \
> bookmarks --color=always
\x1b[0;32m * \x1b[0m\x1b[0;32mX\x1b[0m\x1b[0;32m -1:000000000000\x1b[0m (esc)
$ echo a > a
$ hg add a
$ hg commit -m 0
bookmark X moved to rev 0
$ hg bookmarks
* X 0:f7b1eb17ad24
look up bookmark
$ hg log -r X
changeset: 0:f7b1eb17ad24
bookmark: X
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 0
second bookmark for rev 0, command should work even with ui.strict on
$ hg --config ui.strict=1 bookmark X2
bookmark rev -1 again
$ hg bookmark -r null Y
list bookmarks
$ hg bookmarks
X 0:f7b1eb17ad24
* X2 0:f7b1eb17ad24
Y -1:000000000000
$ echo b > b
$ hg add b
$ hg commit -m 1
$ hg bookmarks -Tjson
[
{
"active": false,
"bookmark": "X",
"node": "f7b1eb17ad24730a1651fccd46c43826d1bbc2ac",
"rev": 0
},
{
"active": true,
"bookmark": "X2",
"node": "925d80f479bb026b0fb3deb27503780b13f74123",
"rev": 1
},
{
"active": false,
"bookmark": "Y",
"node": "0000000000000000000000000000000000000000",
"rev": -1
}
]
bookmarks revset
$ hg log -r 'bookmark()'
changeset: 0:f7b1eb17ad24
bookmark: X
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 0
changeset: 1:925d80f479bb
bookmark: X2
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 1
$ hg log -r 'bookmark(Y)'
$ hg log -r 'bookmark(X2)'
changeset: 1:925d80f479bb
bookmark: X2
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 1
$ hg log -r 'bookmark("re:X")'
changeset: 0:f7b1eb17ad24
bookmark: X
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 0
changeset: 1:925d80f479bb
bookmark: X2
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 1
$ hg log -r 'bookmark("literal:X")'
changeset: 0:f7b1eb17ad24
bookmark: X
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 0
$ hg log -r 'bookmark(unknown)'
abort: bookmark 'unknown' does not exist!
[255]
$ hg log -r 'bookmark("re:unknown")'
abort: no bookmarks exist that match 'unknown'!
[255]
$ hg log -r 'present(bookmark("literal:unknown"))'
$ hg log -r 'present(bookmark("re:unknown"))'
$ hg help revsets | grep 'bookmark('
"bookmark([name])"
bookmarks X and X2 moved to rev 1, Y at rev -1
$ hg bookmarks
X 0:f7b1eb17ad24
* X2 1:925d80f479bb
Y -1:000000000000
bookmark rev 0 again
$ hg bookmark -r 0 Z
$ hg update X
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
(activating bookmark X)
$ echo c > c
$ hg add c
$ hg commit -m 2
created new head
bookmarks X moved to rev 2, Y at rev -1, Z at rev 0
$ hg bookmarks
* X 2:db815d6d32e6
X2 1:925d80f479bb
Y -1:000000000000
Z 0:f7b1eb17ad24
rename nonexistent bookmark
$ hg bookmark -m A B
abort: bookmark 'A' does not exist
[255]
rename to existent bookmark
$ hg bookmark -m X Y
abort: bookmark 'Y' already exists (use -f to force)
[255]
force rename to existent bookmark
$ hg bookmark -f -m X Y
list bookmarks
$ hg bookmark
X2 1:925d80f479bb
* Y 2:db815d6d32e6
Z 0:f7b1eb17ad24
bookmarks from a revset
$ hg bookmark -r '.^1' REVSET
$ hg bookmark -r ':tip' TIP
$ hg up -q TIP
$ hg bookmarks
REVSET 0:f7b1eb17ad24
* TIP 2:db815d6d32e6
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 0:f7b1eb17ad24
$ hg bookmark -d REVSET
$ hg bookmark -d TIP
rename without new name or multiple names
$ hg bookmark -m Y
abort: new bookmark name required
[255]
$ hg bookmark -m Y Y2 Y3
abort: only one new bookmark name allowed
[255]
delete without name
$ hg bookmark -d
abort: bookmark name required
[255]
delete nonexistent bookmark
$ hg bookmark -d A
abort: bookmark 'A' does not exist
[255]
bookmark name with spaces should be stripped
$ hg bookmark ' x y '
list bookmarks
$ hg bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 0:f7b1eb17ad24
* x y 2:db815d6d32e6
look up stripped bookmark name
$ hg log -r '"x y"'
changeset: 2:db815d6d32e6
bookmark: Y
bookmark: x y
tag: tip
parent: 0:f7b1eb17ad24
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 2
reject bookmark name with newline
$ hg bookmark '
> '
abort: bookmark names cannot consist entirely of whitespace
[255]
$ hg bookmark -m Z '
> '
abort: bookmark names cannot consist entirely of whitespace
[255]
bookmark with reserved name
$ hg bookmark tip
abort: the name 'tip' is reserved
[255]
$ hg bookmark .
abort: the name '.' is reserved
[255]
$ hg bookmark null
abort: the name 'null' is reserved
[255]
bookmark with existing name
$ hg bookmark X2
abort: bookmark 'X2' already exists (use -f to force)
[255]
$ hg bookmark -m Y Z
abort: bookmark 'Z' already exists (use -f to force)
[255]
bookmark with name of branch
$ hg bookmark default
abort: a bookmark cannot have the name of an existing branch
[255]
$ hg bookmark -m Y default
abort: a bookmark cannot have the name of an existing branch
[255]
bookmark with integer name
$ hg bookmark 10
abort: cannot use an integer as a name
[255]
incompatible options
$ hg bookmark -m Y -d Z
abort: --delete and --rename are incompatible
[255]
$ hg bookmark -r 1 -d Z
abort: --rev is incompatible with --delete
[255]
$ hg bookmark -r 1 -m Z Y
abort: --rev is incompatible with --rename
[255]
force bookmark with existing name
$ hg bookmark -f X2
force bookmark back to where it was, should deactivate it
$ hg bookmark -fr1 X2
$ hg bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 0:f7b1eb17ad24
x y 2:db815d6d32e6
forward bookmark to descendant without --force
$ hg bookmark Z
moving bookmark 'Z' forward from f7b1eb17ad24
list bookmarks
$ hg bookmark
X2 1:925d80f479bb
Y 2:db815d6d32e6
* Z 2:db815d6d32e6
x y 2:db815d6d32e6
revision but no bookmark name
$ hg bookmark -r .
abort: bookmark name required
[255]
bookmark name with whitespace only
$ hg bookmark ' '
abort: bookmark names cannot consist entirely of whitespace
[255]
$ hg bookmark -m Y ' '
abort: bookmark names cannot consist entirely of whitespace
[255]
invalid bookmark
$ hg bookmark 'foo:bar'
abort: ':' cannot be used in a name
[255]
$ hg bookmark 'foo
> bar'
abort: '\n' cannot be used in a name
[255]
the bookmark extension should be ignored now that it is part of core
$ echo "[extensions]" >> $HGRCPATH
$ echo "bookmarks=" >> $HGRCPATH
$ hg bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
* Z 2:db815d6d32e6
x y 2:db815d6d32e6
test summary
$ hg summary
parent: 2:db815d6d32e6 tip
2
branch: default
bookmarks: *Z Y x y
commit: (clean)
update: 1 new changesets, 2 branch heads (merge)
phases: 3 draft
test id
$ hg id
db815d6d32e6 tip Y/Z/x y
test rollback
$ echo foo > f1
$ hg bookmark tmp-rollback
$ hg ci -Amr
adding f1
$ hg bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 2:db815d6d32e6
* tmp-rollback 3:2bf5cfec5864
x y 2:db815d6d32e6
$ hg rollback
repository tip rolled back to revision 2 (undo commit)
working directory now based on revision 2
$ hg bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 2:db815d6d32e6
* tmp-rollback 2:db815d6d32e6
x y 2:db815d6d32e6
$ hg bookmark -f Z -r 1
$ hg rollback
repository tip rolled back to revision 2 (undo bookmark)
$ hg bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 2:db815d6d32e6
* tmp-rollback 2:db815d6d32e6
x y 2:db815d6d32e6
$ hg bookmark -d tmp-rollback
activate bookmark on working dir parent without --force
$ hg bookmark --inactive Z
$ hg bookmark Z
test clone
$ hg bookmark -r 2 -i @
$ hg bookmark -r 2 -i a@
$ hg bookmarks
@ 2:db815d6d32e6
X2 1:925d80f479bb
Y 2:db815d6d32e6
* Z 2:db815d6d32e6
a@ 2:db815d6d32e6
x y 2:db815d6d32e6
$ hg clone . cloned-bookmarks
updating to bookmark @
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R cloned-bookmarks bookmarks
* @ 2:db815d6d32e6
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 2:db815d6d32e6
a@ 2:db815d6d32e6
x y 2:db815d6d32e6
test clone with pull protocol
$ hg clone --pull . cloned-bookmarks-pull
requesting all changes
adding changesets
adding manifests
adding file changes
added 3 changesets with 3 changes to 3 files (+1 heads)
updating to bookmark @
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R cloned-bookmarks-pull bookmarks
* @ 2:db815d6d32e6
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 2:db815d6d32e6
a@ 2:db815d6d32e6
x y 2:db815d6d32e6
delete multiple bookmarks at once
$ hg bookmark -d @ a@
test clone with a bookmark named "default" (issue3677)
$ hg bookmark -r 1 -f -i default
$ hg clone . cloned-bookmark-default
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R cloned-bookmark-default bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
Z 2:db815d6d32e6
default 1:925d80f479bb
x y 2:db815d6d32e6
$ hg -R cloned-bookmark-default parents -q
2:db815d6d32e6
$ hg bookmark -d default
test clone with a specific revision
$ hg clone -r 925d80 . cloned-bookmarks-rev
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R cloned-bookmarks-rev bookmarks
X2 1:925d80f479bb
test clone with update to a bookmark
$ hg clone -u Z . cloned-bookmarks-update
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg -R cloned-bookmarks-update bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
* Z 2:db815d6d32e6
x y 2:db815d6d32e6
create bundle with two heads
$ hg clone . tobundle
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ echo x > tobundle/x
$ hg -R tobundle add tobundle/x
$ hg -R tobundle commit -m'x'
$ hg -R tobundle update -r -2
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ echo y > tobundle/y
$ hg -R tobundle branch test
marked working directory as branch test
(branches are permanent and global, did you want a bookmark?)
$ hg -R tobundle add tobundle/y
$ hg -R tobundle commit -m'y'
$ hg -R tobundle bundle tobundle.hg
searching for changes
2 changesets found
$ hg unbundle tobundle.hg
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
update to active bookmark if it's not the parent
$ hg summary
parent: 2:db815d6d32e6
2
branch: default
bookmarks: *Z Y x y
commit: 1 added, 1 unknown (new branch head)
update: 2 new changesets (update)
phases: 5 draft
$ hg update
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
updating bookmark Z
$ hg bookmarks
X2 1:925d80f479bb
Y 2:db815d6d32e6
* Z 3:125c9a1d6df6
x y 2:db815d6d32e6
pull --update works the same as pull && update
$ hg bookmark -r3 Y
moving bookmark 'Y' forward from db815d6d32e6
$ hg -R cloned-bookmarks-update update Y
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark Y)
$ hg -R cloned-bookmarks-update pull --update .
pulling from .
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files (+1 heads)
updating bookmark Y
updating bookmark Z
updating to active bookmark Y
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
test wrongly formated bookmark
$ echo '' >> .hg/bookmarks
$ hg bookmarks
X2 1:925d80f479bb
Y 3:125c9a1d6df6
* Z 3:125c9a1d6df6
x y 2:db815d6d32e6
$ echo "Ican'thasformatedlines" >> .hg/bookmarks
$ hg bookmarks
malformed line in .hg/bookmarks: "Ican'thasformatedlines"
X2 1:925d80f479bb
Y 3:125c9a1d6df6
* Z 3:125c9a1d6df6
x y 2:db815d6d32e6
test missing revisions
$ echo "925d80f479bc z" > .hg/bookmarks
$ hg book
no bookmarks set
test stripping a non-checked-out but bookmarked revision
$ hg log --graph
o changeset: 4:9ba5f110a0b3
| branch: test
| tag: tip
| parent: 2:db815d6d32e6
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: y
|
| @ changeset: 3:125c9a1d6df6
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: x
|
o changeset: 2:db815d6d32e6
| parent: 0:f7b1eb17ad24
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: 2
|
| o changeset: 1:925d80f479bb
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: 1
|
o changeset: 0:f7b1eb17ad24
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 0
$ hg book should-end-on-two
$ hg co --clean 4
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
(leaving bookmark should-end-on-two)
$ hg book four
$ hg --config extensions.mq= strip 3
saved backup bundle to * (glob)
should-end-on-two should end up pointing to revision 2, as that's the
tipmost surviving ancestor of the stripped revision.
$ hg log --graph
@ changeset: 3:9ba5f110a0b3
| branch: test
| bookmark: four
| tag: tip
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: y
|
o changeset: 2:db815d6d32e6
| bookmark: should-end-on-two
| parent: 0:f7b1eb17ad24
| user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: 2
|
| o changeset: 1:925d80f479bb
|/ user: test
| date: Thu Jan 01 00:00:00 1970 +0000
| summary: 1
|
o changeset: 0:f7b1eb17ad24
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: 0
test non-linear update not clearing active bookmark
$ hg up 1
1 files updated, 0 files merged, 2 files removed, 0 files unresolved
(leaving bookmark four)
$ hg book drop
$ hg up -C
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
(leaving bookmark drop)
$ hg sum
parent: 2:db815d6d32e6
2
branch: default
bookmarks: should-end-on-two
commit: 2 unknown (clean)
update: 1 new changesets, 2 branch heads (merge)
phases: 4 draft
$ hg book
drop 1:925d80f479bb
four 3:9ba5f110a0b3
should-end-on-two 2:db815d6d32e6
$ hg book -d drop
$ hg up four
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(activating bookmark four)
test clearing divergent bookmarks of linear ancestors
$ hg bookmark Z -r 0
$ hg bookmark Z@1 -r 1
$ hg bookmark Z@2 -r 2
$ hg bookmark Z@3 -r 3
$ hg book
Z 0:f7b1eb17ad24
Z@1 1:925d80f479bb
Z@2 2:db815d6d32e6
Z@3 3:9ba5f110a0b3
* four 3:9ba5f110a0b3
should-end-on-two 2:db815d6d32e6
$ hg bookmark Z
moving bookmark 'Z' forward from f7b1eb17ad24
$ hg book
* Z 3:9ba5f110a0b3
Z@1 1:925d80f479bb
four 3:9ba5f110a0b3
should-end-on-two 2:db815d6d32e6
test clearing only a single divergent bookmark across branches
$ hg book foo -r 1
$ hg book foo@1 -r 0
$ hg book foo@2 -r 2
$ hg book foo@3 -r 3
$ hg book foo -r foo@3
$ hg book
* Z 3:9ba5f110a0b3
Z@1 1:925d80f479bb
foo 3:9ba5f110a0b3
foo@1 0:f7b1eb17ad24
foo@2 2:db815d6d32e6
four 3:9ba5f110a0b3
should-end-on-two 2:db815d6d32e6