Mercurial > hg
view tests/test-push-r.t @ 27430:e240e914d226 stable
revlog: seek to end of file before writing (issue4943)
Revlogs were recently refactored to open file handles in "a+" and use a
persistent file handle for reading and writing. This drastically
reduced the number of file handles being opened.
Unfortunately, it appears that some versions of Solaris lose the file
offset when performing a write after the handle has been seeked.
The simplest workaround is to seek to EOF on files opened in a+ mode
before writing to them, which is what this patch does.
Ideally, this code would exist in the vfs layer. However, this would
require creating a proxy class for file objects in order to provide a
custom implementation of write(). This would add overhead. Since
revlogs are the only files we open in a+ mode, the one-off workaround
in revlog.py should be sufficient.
This patch appears to have little to no impact on performance on my
Linux machine.
| author | Gregory Szorc <gregory.szorc@gmail.com> |
|---|---|
| date | Thu, 17 Dec 2015 17:16:02 -0800 |
| parents | f2719b387380 |
| children | 24ea47037186 |
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$ hg init test $ cd test $ hg unbundle "$TESTDIR/bundles/remote.hg" adding changesets adding manifests adding file changes added 9 changesets with 7 changes to 4 files (+1 heads) (run 'hg heads' to see heads, 'hg merge' to merge) $ hg up tip 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd .. $ for i in 0 1 2 3 4 5 6 7 8; do > echo > mkdir test-"$i" > hg --cwd test-"$i" init > hg -R test push -r "$i" test-"$i" > cd test-"$i" > hg verify > cd .. > done pushing to test-0 searching for changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 1 changesets, 1 total revisions pushing to test-1 searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 2 changesets, 2 total revisions pushing to test-2 searching for changes adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 3 changesets, 3 total revisions pushing to test-3 searching for changes adding changesets adding manifests adding file changes added 4 changesets with 4 changes to 1 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 4 changesets, 4 total revisions pushing to test-4 searching for changes adding changesets adding manifests adding file changes added 2 changesets with 2 changes to 1 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 2 changesets, 2 total revisions pushing to test-5 searching for changes adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 1 files, 3 changesets, 3 total revisions pushing to test-6 searching for changes adding changesets adding manifests adding file changes added 4 changesets with 5 changes to 2 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 2 files, 4 changesets, 5 total revisions pushing to test-7 searching for changes adding changesets adding manifests adding file changes added 5 changesets with 6 changes to 3 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 3 files, 5 changesets, 6 total revisions pushing to test-8 searching for changes adding changesets adding manifests adding file changes added 5 changesets with 5 changes to 2 files checking changesets checking manifests crosschecking files in changesets and manifests checking files 2 files, 5 changesets, 5 total revisions $ cd test-8 $ hg pull ../test-7 pulling from ../test-7 searching for changes adding changesets adding manifests adding file changes added 4 changesets with 2 changes to 3 files (+1 heads) (run 'hg heads' to see heads, 'hg merge' to merge) $ hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files 4 files, 9 changesets, 7 total revisions $ cd ..