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view tests/test-convert-bzr-merges.t @ 30288:ceddc3d94d74
revlog: inline start() and end() for perf reasons
When I implemented `hg perfrevlogchunks`, one of the things that
stood out was N * _chunk() calls was ~38x slower than 1
_chunks() call. Specifically, on the mozilla-unified repo:
N*_chunk: 0.528997s
1*_chunks: 0.013735s
This repo has 352,097 changesets. So the average time per changeset
comes out to:
N*_chunk: 1.502us
1*_chunks: 0.039us
If you extrapolate these numbers to a repository with 1M changesets,
that comes out to 1.502s versus 0.039s, which is significant.
At these latencies, Python attribute lookups and function calls
matter. So, this patch inlines some code to cut down on that overhead.
The impact of this patch on N*_chunk() calls is clear:
! wall 0.528997 comb 0.520000 user 0.500000 sys 0.020000 (best of 19)
! wall 0.367723 comb 0.370000 user 0.350000 sys 0.020000 (best of 27)
So, we go from ~38x slower to ~27x. A nice improvement. But there's
still a long way to go.
It's worth noting that functionality like revsets perform changelog
lookups one revision at a time. So this code path is worth optimizing.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sat, 22 Oct 2016 15:41:23 -0700 |
parents | 89872688893f |
children | 30a027c0e327 |
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#require bzr N.B. bzr 1.13 has a bug that breaks this test. If you see this test fail, check your bzr version. Upgrading to bzr 1.13.1 should fix it. $ . "$TESTDIR/bzr-definitions" test multiple merges at once $ mkdir test-multimerge $ cd test-multimerge $ bzr init -q source $ cd source $ echo content > file $ bzr add -q file $ bzr commit -q -m 'Initial add' $ cd .. $ bzr branch -q source source-branch1 $ cd source-branch1 $ echo morecontent >> file $ echo evenmorecontent > file-branch1 $ bzr add -q file-branch1 $ bzr commit -q -m 'Added branch1 file' $ cd ../source $ sleep 1 $ echo content > file-parent $ bzr add -q file-parent $ bzr commit -q -m 'Added parent file' $ cd .. $ bzr branch -q source source-branch2 $ cd source-branch2 $ echo somecontent > file-branch2 $ bzr add -q file-branch2 $ bzr commit -q -m 'Added brach2 file' $ sleep 1 $ cd ../source $ bzr merge -q ../source-branch1 $ bzr merge -q --force ../source-branch2 $ bzr commit -q -m 'Merged branches' $ cd .. $ hg convert --datesort source source-hg initializing destination source-hg repository scanning source... sorting... converting... 4 Initial add 3 Added branch1 file 2 Added parent file 1 Added brach2 file 0 Merged branches $ glog -R source-hg o 5@source "(octopus merge fixup)" files: |\ | o 4@source "Merged branches" files: file-branch2 | |\ o---+ 3@source-branch2 "Added brach2 file" files: file-branch2 / / | o 2@source "Added parent file" files: file-parent | | o | 1@source-branch1 "Added branch1 file" files: file file-branch1 |/ o 0@source "Initial add" files: file $ manifest source-hg tip % manifest of tip 644 file 644 file-branch1 644 file-branch2 644 file-parent $ cd ..