Mercurial > hg
view tests/test-pull.t @ 30561:7c0c722d568d
bdiff: early pruning of common prefix before doing expensive computations
It seems quite common that files don't change completely. New lines are often
pretty much appended, and modifications will often only change a small section
of the file which on average will be in the middle.
There can thus be a big win by pruning a common prefix before starting the more
expensive search for longest common substrings.
Worst case, it will scan through a long sequence of similar bytes without
encountering a newline. Splitlines will then have to do the same again ...
twice for each side. If similar lines are found, splitlines will save the
double iteration and hashing of the lines ... plus there will be less lines to
find common substrings in.
This change might in some cases make the algorith pick shorter or less optimal
common substrings. We can't have the cake and eat it.
This make hg --time bundle --base null -r 4.0 go from 14.5 to 15 s - a 3%
increase.
On mozilla-unified:
perfbdiff -m 3041e4d59df2
! wall 0.053088 comb 0.060000 user 0.060000 sys 0.000000 (best of 100) to
! wall 0.024618 comb 0.020000 user 0.020000 sys 0.000000 (best of 116)
perfbdiff 0e9928989e9c --alldata --count 10
! wall 0.702075 comb 0.700000 user 0.700000 sys 0.000000 (best of 15) to
! wall 0.579235 comb 0.580000 user 0.580000 sys 0.000000 (best of 18)
author | Mads Kiilerich <madski@unity3d.com> |
---|---|
date | Wed, 16 Nov 2016 19:45:35 +0100 |
parents | a3fcc8e3136b |
children | 5e92ba77793c |
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#require serve $ hg init test $ cd test $ echo foo>foo $ hg addremove adding foo $ hg commit -m 1 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 1 changesets, 1 total revisions $ hg serve -p $HGPORT -d --pid-file=hg.pid $ cat hg.pid >> $DAEMON_PIDS $ cd .. $ hg clone --pull http://foo:bar@localhost:$HGPORT/ copy requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files updating to branch default 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd copy $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 1 changesets, 1 total revisions $ hg co 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cat foo foo $ hg manifest --debug 2ed2a3912a0b24502043eae84ee4b279c18b90dd 644 foo $ hg pull pulling from http://foo@localhost:$HGPORT/ searching for changes no changes found $ hg rollback --dry-run --verbose repository tip rolled back to revision -1 (undo pull: http://foo:***@localhost:$HGPORT/) Test pull of non-existing 20 character revision specification, making sure plain ascii identifiers not are encoded like a node: $ hg pull -r 'xxxxxxxxxxxxxxxxxxxy' pulling from http://foo@localhost:$HGPORT/ abort: unknown revision 'xxxxxxxxxxxxxxxxxxxy'! [255] $ hg pull -r 'xxxxxxxxxxxxxxxxxx y' pulling from http://foo@localhost:$HGPORT/ abort: unknown revision '7878787878787878787878787878787878782079'! [255] Issue622: hg init && hg pull -u URL doesn't checkout default branch $ cd .. $ hg init empty $ cd empty $ hg pull -u ../test pulling from ../test requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files 1 files updated, 0 files merged, 0 files removed, 0 files unresolved Test 'file:' uri handling: $ hg pull -q file://../test-does-not-exist abort: file:// URLs can only refer to localhost [255] $ hg pull -q file://../test abort: file:// URLs can only refer to localhost [255] $ hg pull -q file:../test # no-msys It's tricky to make file:// URLs working on every platform with regular shell commands. $ URL=`$PYTHON -c "import os; print 'file://foobar' + ('/' + os.getcwd().replace(os.sep, '/')).replace('//', '/') + '/../test'"` $ hg pull -q "$URL" abort: file:// URLs can only refer to localhost [255] $ URL=`$PYTHON -c "import os; print 'file://localhost' + ('/' + os.getcwd().replace(os.sep, '/')).replace('//', '/') + '/../test'"` $ hg pull -q "$URL" $ cd ..