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changegroup: increase write buffer size to 128k...
changegroup: increase write buffer size to 128k By default, Python defers to the operating system for choosing the default buffer size on opened files. On my Linux machine, the default is 4k, which is really small for 2016. This patch bumps the write buffer size when writing changegroups/bundles to 128k. This matches the 128k read buffer we already use on revlogs. It's worth noting that this only impacts when writing to an explicit file (such as during `hg bundle`). Buffers when writing to bundle files via the repo vfs or to a temporary file are not impacted. When producing a none-v2 bundle file of the mozilla-unified repository, this change caused the number of write() system calls to drop from 952,449 to 29,788. After this change, the most frequent system calls are fstat(), read(), lseek(), and open(). There were 2,523,672 system calls after this patch (so a net decrease of ~950k is statistically significant). This change shows no performance change on my system. But I have a high-end system with a fast SSD. It is quite possible this change will have a significant impact on network file systems, where extra network round trips due to excessive I/O system calls could introduce significant latency.
Laurent Charignon - - Load All Authors

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r26998:4414d500 default
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test-tag.t
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$ hg init test
$ cd test
$ echo a > a
$ hg add a
$ hg commit -m "test"
$ hg history
changeset: 0:acb14030fe0a
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: test
$ hg tag ' '
abort: tag names cannot consist entirely of whitespace
[255]
(this tests also that editor is not invoked, if '--edit' is not
specified)
$ HGEDITOR=cat hg tag "bleah"
$ hg history
changeset: 1:d4f0d2909abc
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Added tag bleah for changeset acb14030fe0a
changeset: 0:acb14030fe0a
tag: bleah
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: test
$ echo foo >> .hgtags
$ hg tag "bleah2"
abort: working copy of .hgtags is changed
(please commit .hgtags manually)
[255]
$ hg revert .hgtags
$ hg tag -r 0 x y z y y z
abort: tag names must be unique
[255]
$ hg tag tap nada dot tip
abort: the name 'tip' is reserved
[255]
$ hg tag .
abort: the name '.' is reserved
[255]
$ hg tag null
abort: the name 'null' is reserved
[255]
$ hg tag "bleah"
abort: tag 'bleah' already exists (use -f to force)
[255]
$ hg tag "blecch" "bleah"
abort: tag 'bleah' already exists (use -f to force)
[255]
$ hg tag --remove "blecch"
abort: tag 'blecch' does not exist
[255]
$ hg tag --remove "bleah" "blecch" "blough"
abort: tag 'blecch' does not exist
[255]
$ hg tag -r 0 "bleah0"
$ hg tag -l -r 1 "bleah1"
$ hg tag gack gawk gorp
$ hg tag -f gack
$ hg tag --remove gack gorp
$ hg tag "bleah "
abort: tag 'bleah' already exists (use -f to force)
[255]
$ hg tag " bleah"
abort: tag 'bleah' already exists (use -f to force)
[255]
$ hg tag " bleah"
abort: tag 'bleah' already exists (use -f to force)
[255]
$ hg tag -r 0 " bleahbleah "
$ hg tag -r 0 " bleah bleah "
$ cat .hgtags
acb14030fe0a21b60322c440ad2d20cf7685a376 bleah
acb14030fe0a21b60322c440ad2d20cf7685a376 bleah0
336fccc858a4eb69609a291105009e484a6b6b8d gack
336fccc858a4eb69609a291105009e484a6b6b8d gawk
336fccc858a4eb69609a291105009e484a6b6b8d gorp
336fccc858a4eb69609a291105009e484a6b6b8d gack
799667b6f2d9b957f73fa644a918c2df22bab58f gack
799667b6f2d9b957f73fa644a918c2df22bab58f gack
0000000000000000000000000000000000000000 gack
336fccc858a4eb69609a291105009e484a6b6b8d gorp
0000000000000000000000000000000000000000 gorp
acb14030fe0a21b60322c440ad2d20cf7685a376 bleahbleah
acb14030fe0a21b60322c440ad2d20cf7685a376 bleah bleah
$ cat .hg/localtags
d4f0d2909abc9290e2773c08837d70c1794e3f5a bleah1
tagging on a non-head revision
$ hg update 0
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg tag -l localblah
$ hg tag "foobar"
abort: not at a branch head (use -f to force)
[255]
$ hg tag -f "foobar"
$ cat .hgtags
acb14030fe0a21b60322c440ad2d20cf7685a376 foobar
$ cat .hg/localtags
d4f0d2909abc9290e2773c08837d70c1794e3f5a bleah1
acb14030fe0a21b60322c440ad2d20cf7685a376 localblah
$ hg tag -l 'xx
> newline'
abort: '\n' cannot be used in a name
[255]
$ hg tag -l 'xx:xx'
abort: ':' cannot be used in a name
[255]
cloning local tags
$ cd ..
$ hg -R test log -r0:5
changeset: 0:acb14030fe0a
tag: bleah
tag: bleah bleah
tag: bleah0
tag: bleahbleah
tag: foobar
tag: localblah
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: test
changeset: 1:d4f0d2909abc
tag: bleah1
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Added tag bleah for changeset acb14030fe0a
changeset: 2:336fccc858a4
tag: gawk
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Added tag bleah0 for changeset acb14030fe0a
changeset: 3:799667b6f2d9
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Added tag gack, gawk, gorp for changeset 336fccc858a4
changeset: 4:154eeb7c0138
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Added tag gack for changeset 799667b6f2d9
changeset: 5:b4bb47aaff09
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Removed tag gack, gorp
$ hg clone -q -rbleah1 test test1
$ hg -R test1 parents --style=compact
1[tip] d4f0d2909abc 1970-01-01 00:00 +0000 test
Added tag bleah for changeset acb14030fe0a
$ hg clone -q -r5 test#bleah1 test2
$ hg -R test2 parents --style=compact
5[tip] b4bb47aaff09 1970-01-01 00:00 +0000 test
Removed tag gack, gorp
$ hg clone -q -U test#bleah1 test3
$ hg -R test3 parents --style=compact
$ cd test
Issue601: hg tag doesn't do the right thing if .hgtags or localtags
doesn't end with EOL
$ python << EOF
> f = file('.hg/localtags'); last = f.readlines()[-1][:-1]; f.close()
> f = file('.hg/localtags', 'w'); f.write(last); f.close()
> EOF
$ cat .hg/localtags; echo
acb14030fe0a21b60322c440ad2d20cf7685a376 localblah
$ hg tag -l localnewline
$ cat .hg/localtags; echo
acb14030fe0a21b60322c440ad2d20cf7685a376 localblah
c2899151f4e76890c602a2597a650a72666681bf localnewline
$ python << EOF
> f = file('.hgtags'); last = f.readlines()[-1][:-1]; f.close()
> f = file('.hgtags', 'w'); f.write(last); f.close()
> EOF
$ hg ci -m'broken manual edit of .hgtags'
$ cat .hgtags; echo
acb14030fe0a21b60322c440ad2d20cf7685a376 foobar
$ hg tag newline
$ cat .hgtags; echo
acb14030fe0a21b60322c440ad2d20cf7685a376 foobar
a0eea09de1eeec777b46f2085260a373b2fbc293 newline
tag and branch using same name
$ hg branch tag-and-branch-same-name
marked working directory as branch tag-and-branch-same-name
(branches are permanent and global, did you want a bookmark?)
$ hg ci -m"discouraged"
$ hg tag tag-and-branch-same-name
warning: tag tag-and-branch-same-name conflicts with existing branch name
test custom commit messages
$ cat > editor.sh << '__EOF__'
> echo "==== before editing"
> cat "$1"
> echo "===="
> echo "custom tag message" > "$1"
> echo "second line" >> "$1"
> __EOF__
at first, test saving last-message.txt
(test that editor is not invoked before transaction starting)
$ cat > .hg/hgrc << '__EOF__'
> [hooks]
> # this failure occurs before editor invocation
> pretag.test-saving-lastmessage = false
> __EOF__
$ rm -f .hg/last-message.txt
$ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg tag custom-tag -e
abort: pretag.test-saving-lastmessage hook exited with status 1
[255]
$ test -f .hg/last-message.txt
[1]
(test that editor is invoked and commit message is saved into
"last-message.txt")
$ cat >> .hg/hgrc << '__EOF__'
> [hooks]
> pretag.test-saving-lastmessage =
> # this failure occurs after editor invocation
> pretxncommit.unexpectedabort = false
> __EOF__
(this tests also that editor is invoked, if '--edit' is specified,
regardless of '--message')
$ rm -f .hg/last-message.txt
$ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg tag custom-tag -e -m "foo bar"
==== before editing
foo bar
HG: Enter commit message. Lines beginning with 'HG:' are removed.
HG: Leave message empty to abort commit.
HG: --
HG: user: test
HG: branch 'tag-and-branch-same-name'
HG: changed .hgtags
====
note: commit message saved in .hg/last-message.txt
transaction abort!
rollback completed
abort: pretxncommit.unexpectedabort hook exited with status 1
[255]
$ cat .hg/last-message.txt
custom tag message
second line
$ cat >> .hg/hgrc << '__EOF__'
> [hooks]
> pretxncommit.unexpectedabort =
> __EOF__
$ hg status .hgtags
M .hgtags
$ hg revert --no-backup -q .hgtags
then, test custom commit message itself
$ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg tag custom-tag -e
==== before editing
Added tag custom-tag for changeset 75a534207be6
HG: Enter commit message. Lines beginning with 'HG:' are removed.
HG: Leave message empty to abort commit.
HG: --
HG: user: test
HG: branch 'tag-and-branch-same-name'
HG: changed .hgtags
====
$ hg log -l1 --template "{desc}\n"
custom tag message
second line
local tag with .hgtags modified
$ hg tag hgtags-modified
$ hg rollback
repository tip rolled back to revision 13 (undo commit)
working directory now based on revision 13
$ hg st
M .hgtags
? .hgtags.orig
? editor.sh
$ hg tag --local baz
$ hg revert --no-backup .hgtags
tagging when at named-branch-head that's not a topo-head
$ hg up default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge -t internal:local
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg ci -m 'merge named branch'
$ hg up 13
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg tag new-topo-head
tagging on null rev
$ hg up null
0 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ hg tag nullrev
abort: not at a branch head (use -f to force)
[255]
$ hg init empty
$ hg tag -R empty nullrev
abort: cannot tag null revision
[255]
$ hg tag -R empty -r 00000000000 -f nulltag
abort: cannot tag null revision
[255]
$ cd ..
tagging on an uncommitted merge (issue2542)
$ hg init repo-tag-uncommitted-merge
$ cd repo-tag-uncommitted-merge
$ echo c1 > f1
$ hg ci -Am0
adding f1
$ echo c2 > f2
$ hg ci -Am1
adding f2
$ hg co -q 0
$ hg branch b1
marked working directory as branch b1
(branches are permanent and global, did you want a bookmark?)
$ hg ci -m2
$ hg up default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge b1
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg tag t1
abort: uncommitted merge
[255]
$ hg status
$ hg tag --rev 1 t2
abort: uncommitted merge
[255]
$ hg tag --rev 1 --local t3
$ hg tags -v
tip 2:2a156e8887cc
t3 1:c3adabd1a5f4 local
$ cd ..
commit hook on tag used to be run without write lock - issue3344
$ hg init repo-tag
$ touch repo-tag/test
$ hg -R repo-tag commit -A -m "test"
adding test
$ hg init repo-tag-target
$ cat > "$TESTTMP/issue3344.sh" <<EOF
> hg push "$TESTTMP/repo-tag-target"
> EOF
$ hg -R repo-tag --config hooks.commit="sh ../issue3344.sh" tag tag
pushing to $TESTTMP/repo-tag-target (glob)
searching for changes
adding changesets
adding manifests
adding file changes
added 2 changesets with 2 changes to 2 files
automatically merge resolvable tag conflicts (i.e. tags that differ in rank)
create two clones with some different tags as well as some common tags
check that we can merge tags that differ in rank
$ hg init repo-automatic-tag-merge
$ cd repo-automatic-tag-merge
$ echo c0 > f0
$ hg ci -A -m0
adding f0
$ hg tag tbase
$ hg up -qr '.^'
$ hg log -r 'wdir()' -T "{latesttagdistance}\n"
1
$ hg up -q
$ hg log -r 'wdir()' -T "{latesttagdistance}\n"
2
$ cd ..
$ hg clone repo-automatic-tag-merge repo-automatic-tag-merge-clone
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd repo-automatic-tag-merge-clone
$ echo c1 > f1
$ hg ci -A -m1
adding f1
$ hg tag t1 t2 t3
$ hg tag --remove t2
$ hg tag t5
$ echo c2 > f2
$ hg ci -A -m2
adding f2
$ hg tag -f t3
$ cd ../repo-automatic-tag-merge
$ echo c3 > f3
$ hg ci -A -m3
adding f3
$ hg tag -f t4 t5 t6
$ hg up -q '.^'
$ hg log -r 'wdir()' -T "{changessincelatesttag} changes since {latesttag}\n"
1 changes since t4:t5:t6
$ hg log -r '.' -T "{changessincelatesttag} changes since {latesttag}\n"
0 changes since t4:t5:t6
$ echo c5 > f3
$ hg log -r 'wdir()' -T "{changessincelatesttag} changes since {latesttag}\n"
1 changes since t4:t5:t6
$ hg up -qC
$ hg tag --remove t5
$ echo c4 > f4
$ hg log -r '.' -T "{changessincelatesttag} changes since {latesttag}\n"
2 changes since t4:t6
$ hg log -r '.' -T "{latesttag % '{latesttag}\n'}"
t4
t6
$ hg log -r '.' -T "{latesttag('t4') % 'T: {tag}, C: {changes}, D: {distance}\n'}"
T: t4, C: 2, D: 2
$ hg log -r '.' -T "{latesttag('re:\d') % 'T: {tag}, C: {changes}, D: {distance}\n'}"
T: t4, C: 2, D: 2
T: t6, C: 2, D: 2
$ hg log -r . -T '{join(latesttag(), "*")}\n'
t4*t6
$ hg ci -A -m4
adding f4
$ hg log -r 'wdir()' -T "{changessincelatesttag} changes since {latesttag}\n"
4 changes since t4:t6
$ hg tag t2
$ hg tag -f t6
$ cd ../repo-automatic-tag-merge-clone
$ hg pull
pulling from $TESTTMP/repo-automatic-tag-merge (glob)
searching for changes
adding changesets
adding manifests
adding file changes
added 6 changesets with 6 changes to 3 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
$ hg merge --tool internal:tagmerge
merging .hgtags
2 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg status
M .hgtags
M f3
M f4
$ hg resolve -l
R .hgtags
$ cat .hgtags
9aa4e1292a27a248f8d07339bed9931d54907be7 t4
9aa4e1292a27a248f8d07339bed9931d54907be7 t6
9aa4e1292a27a248f8d07339bed9931d54907be7 t6
09af2ce14077a94effef208b49a718f4836d4338 t6
6cee5c8f3e5b4ae1a3996d2f6489c3e08eb5aea7 tbase
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t1
929bca7b18d067cbf3844c3896319a940059d748 t2
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
0000000000000000000000000000000000000000 t2
875517b4806a848f942811a315a5bce30804ae85 t5
9aa4e1292a27a248f8d07339bed9931d54907be7 t5
9aa4e1292a27a248f8d07339bed9931d54907be7 t5
0000000000000000000000000000000000000000 t5
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
79505d5360b07e3e79d1052e347e73c02b8afa5b t3
check that the merge tried to minimize the diff with the first merge parent
$ hg diff --git -r 'p1()' .hgtags
diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -1,9 +1,17 @@
+9aa4e1292a27a248f8d07339bed9931d54907be7 t4
+9aa4e1292a27a248f8d07339bed9931d54907be7 t6
+9aa4e1292a27a248f8d07339bed9931d54907be7 t6
+09af2ce14077a94effef208b49a718f4836d4338 t6
6cee5c8f3e5b4ae1a3996d2f6489c3e08eb5aea7 tbase
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t1
+929bca7b18d067cbf3844c3896319a940059d748 t2
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
0000000000000000000000000000000000000000 t2
875517b4806a848f942811a315a5bce30804ae85 t5
+9aa4e1292a27a248f8d07339bed9931d54907be7 t5
+9aa4e1292a27a248f8d07339bed9931d54907be7 t5
+0000000000000000000000000000000000000000 t5
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
79505d5360b07e3e79d1052e347e73c02b8afa5b t3
detect merge tag conflicts
$ hg update -C -r tip
3 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ hg tag t7
$ hg update -C -r 'first(sort(head()))'
3 files updated, 0 files merged, 2 files removed, 0 files unresolved
$ printf "%s %s\n" `hg log -r . --template "{node} t7"` >> .hgtags
$ hg commit -m "manually add conflicting t7 tag"
$ hg merge --tool internal:tagmerge
merging .hgtags
automatic .hgtags merge failed
the following 1 tags are in conflict: t7
automatic tag merging of .hgtags failed! (use 'hg resolve --tool :merge' or another merge tool of your choice)
2 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C .' to abandon
[1]
$ hg resolve -l
U .hgtags
$ cat .hgtags
6cee5c8f3e5b4ae1a3996d2f6489c3e08eb5aea7 tbase
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t1
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
0000000000000000000000000000000000000000 t2
875517b4806a848f942811a315a5bce30804ae85 t5
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
79505d5360b07e3e79d1052e347e73c02b8afa5b t3
ea918d56be86a4afc5a95312e8b6750e1428d9d2 t7
$ cd ..
handle the loss of tags
$ hg clone repo-automatic-tag-merge-clone repo-merge-lost-tags
updating to branch default
4 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd repo-merge-lost-tags
$ echo c5 > f5
$ hg ci -A -m5
adding f5
$ hg tag -f t7
$ hg update -r 'p1(t7)'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ printf '' > .hgtags
$ hg commit -m 'delete all tags'
created new head
$ hg log -r 'max(t7::)'
changeset: 17:ffe462b50880
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: Added tag t7 for changeset fd3a9e394ce3
$ hg update -r 'max(t7::)'
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge -r tip --tool internal:tagmerge
merging .hgtags
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg resolve -l
R .hgtags
$ cat .hgtags
6cee5c8f3e5b4ae1a3996d2f6489c3e08eb5aea7 tbase
0000000000000000000000000000000000000000 tbase
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t1
0000000000000000000000000000000000000000 t1
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
0000000000000000000000000000000000000000 t2
875517b4806a848f942811a315a5bce30804ae85 t5
0000000000000000000000000000000000000000 t5
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
79505d5360b07e3e79d1052e347e73c02b8afa5b t3
0000000000000000000000000000000000000000 t3
ea918d56be86a4afc5a95312e8b6750e1428d9d2 t7
0000000000000000000000000000000000000000 t7
ea918d56be86a4afc5a95312e8b6750e1428d9d2 t7
fd3a9e394ce3afb354a496323bf68ac1755a30de t7
also check that we minimize the diff with the 1st merge parent
$ hg diff --git -r 'p1()' .hgtags
diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -1,12 +1,17 @@
6cee5c8f3e5b4ae1a3996d2f6489c3e08eb5aea7 tbase
+0000000000000000000000000000000000000000 tbase
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t1
+0000000000000000000000000000000000000000 t1
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t2
0000000000000000000000000000000000000000 t2
875517b4806a848f942811a315a5bce30804ae85 t5
+0000000000000000000000000000000000000000 t5
4f3e9b90005b68b4d8a3f4355cedc302a8364f5c t3
79505d5360b07e3e79d1052e347e73c02b8afa5b t3
+0000000000000000000000000000000000000000 t3
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