Mercurial > hg
view tests/test-static-http.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 | 34a5f6c66bc5 |
children | 728d37353e1e |
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#require killdaemons $ hg clone http://localhost:$HGPORT/ copy abort: * (glob) [255] $ test -d copy [1] This server doesn't do range requests so it's basically only good for one pull $ python "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid $ cat dumb.pid >> $DAEMON_PIDS $ hg init remote $ cd remote $ echo foo > bar $ echo c2 > '.dotfile with spaces' $ hg add adding .dotfile with spaces adding bar $ hg commit -m"test" $ hg tip changeset: 0:02770d679fb8 tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: test $ cd .. $ hg clone static-http://localhost:$HGPORT/remote local requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 2 changes to 2 files updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd local $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 2 files, 1 changesets, 2 total revisions $ cat bar foo $ cd ../remote $ echo baz > quux $ hg commit -A -mtest2 adding quux check for HTTP opener failures when cachefile does not exist $ rm .hg/cache/* $ cd ../local $ cat >> .hg/hgrc <<EOF > [hooks] > changegroup = sh -c "printenv.py changegroup" > EOF $ hg pull pulling from static-http://localhost:$HGPORT/remote searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files changegroup hook: HG_NODE=4ac2e3648604439c580c69b09ec9d93a88d93432 HG_NODE_LAST=4ac2e3648604439c580c69b09ec9d93a88d93432 HG_SOURCE=pull HG_TXNID=TXN:* HG_URL=http://localhost:$HGPORT/remote (glob) (run 'hg update' to get a working copy) trying to push $ hg update 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ echo more foo >> bar $ hg commit -m"test" $ hg push pushing to static-http://localhost:$HGPORT/remote abort: destination does not support push [255] trying clone -r $ cd .. $ hg clone -r doesnotexist static-http://localhost:$HGPORT/remote local0 abort: unknown revision 'doesnotexist'! [255] $ hg clone -r 0 static-http://localhost:$HGPORT/remote local0 adding changesets adding manifests adding file changes added 1 changesets with 2 changes to 2 files updating to branch default 2 files updated, 0 files merged, 0 files removed, 0 files unresolved test with "/" URI (issue747) and subrepo $ hg init $ hg init sub $ touch sub/test $ hg -R sub commit -A -m "test" adding test $ hg -R sub tag not-empty $ echo sub=sub > .hgsub $ echo a > a $ hg add a .hgsub $ hg -q ci -ma $ hg clone static-http://localhost:$HGPORT/ local2 requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 3 changes to 3 files updating to branch default cloning subrepo sub from static-http://localhost:$HGPORT/sub requesting all changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 2 files 3 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd local2 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 3 files, 1 changesets, 3 total revisions checking subrepo links $ cat a a $ hg paths default = static-http://localhost:$HGPORT/ test with empty repo (issue965) $ cd .. $ hg init remotempty $ hg clone static-http://localhost:$HGPORT/remotempty local3 no changes found updating to branch default 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd local3 $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 0 files, 0 changesets, 0 total revisions $ hg paths default = static-http://localhost:$HGPORT/remotempty test with non-repo $ cd .. $ mkdir notarepo $ hg clone static-http://localhost:$HGPORT/notarepo local3 abort: 'http://localhost:$HGPORT/notarepo' does not appear to be an hg repository! [255] $ killdaemons.py