Mercurial > hg
view tests/test-convert-svn-startrev.t @ 30289:1f92056c4066
revlog: optimize _chunkraw when startrev==endrev
In many cases, _chunkraw() is called with startrev==endrev. When
this is true, we can avoid an extra index lookup and some other
minor operations.
On the mozilla-unified repo, `hg perfrevlogchunks -c` says this
has the following impact:
! read w/ reused fd
! wall 0.371846 comb 0.370000 user 0.350000 sys 0.020000 (best of 27)
! wall 0.337930 comb 0.330000 user 0.300000 sys 0.030000 (best of 30)
! read batch w/ reused fd
! wall 0.014952 comb 0.020000 user 0.000000 sys 0.020000 (best of 197)
! wall 0.014866 comb 0.010000 user 0.000000 sys 0.010000 (best of 196)
So, we've gone from ~25x slower than batch to ~22.5x slower.
At this point, there's probably not much else we can do except
implement an optimized function in the index itself, including in C.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sun, 23 Oct 2016 10:40:33 -0700 |
parents | 7a9cbb315d84 |
children |
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#require svn svn-bindings $ cat >> $HGRCPATH <<EOF > [extensions] > convert = > EOF $ convert() > { > startrev=$1 > repopath=A-r$startrev-hg > hg convert --config convert.svn.startrev=$startrev \ > --config convert.svn.trunk=branches/branch1 \ > --config convert.svn.branches=" " \ > --config convert.svn.tags= \ > --datesort svn-repo $repopath > hg -R $repopath log -G \ > --template '{rev} {desc|firstline} files: {files}\n' > echo > } $ svnadmin create svn-repo $ svnadmin load -q svn-repo < "$TESTDIR/svn/startrev.svndump" Convert before branching point $ convert 3 initializing destination A-r3-hg repository scanning source... sorting... converting... 3 removeb 2 changeaa 1 branch, changeaaa 0 addc,changeaaaa o 3 addc,changeaaaa files: a c | o 2 branch, changeaaa files: a | o 1 changeaa files: a | o 0 removeb files: a Convert before branching point $ convert 4 initializing destination A-r4-hg repository scanning source... sorting... converting... 2 changeaa 1 branch, changeaaa 0 addc,changeaaaa o 2 addc,changeaaaa files: a c | o 1 branch, changeaaa files: a | o 0 changeaa files: a Convert at branching point $ convert 5 initializing destination A-r5-hg repository scanning source... sorting... converting... 1 branch, changeaaa 0 addc,changeaaaa o 1 addc,changeaaaa files: a c | o 0 branch, changeaaa files: a Convert last revision only $ convert 6 initializing destination A-r6-hg repository scanning source... sorting... converting... 0 addc,changeaaaa o 0 addc,changeaaaa files: a c