Mercurial > hg
view tests/test-revlog-mmapindex.t @ 50242:379a78001d8e stable
dirstate: set identity whenever we read the dirstate's v2 docket
The docket can be loaded outside of a full read (for exemple when
pre-fetching parents), so the current code would read/set the identity
after loading the data, opening a race condition:
A0: first process docket is read
B0: other process appends new data to the dirstate (and changes the docket)
A1: first process sets the identity (based on pre-B content, but with post-B identity)
A1: first process loads the dirstatemap from the data file
A1: first process does not detect the race and overwrites the update from B.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Wed, 01 Mar 2023 02:38:20 +0100 |
parents | 42d2b31cee0b |
children | dcaa2df1f688 |
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create verbosemmap.py $ cat << EOF > verbosemmap.py > # extension to make util.mmapread verbose > > > from mercurial import ( > extensions, > pycompat, > util, > ) > > def extsetup(ui): > def mmapread(orig, fp): > ui.write(b"mmapping %s\n" % pycompat.bytestr(fp.name)) > ui.flush() > return orig(fp) > > extensions.wrapfunction(util, 'mmapread', mmapread) > EOF setting up base repo $ hg init a $ cd a $ touch a $ hg add a $ hg commit -qm base $ for i in `$TESTDIR/seq.py 1 100` ; do > echo $i > a > hg commit -qm $i > done set up verbosemmap extension $ cat << EOF >> $HGRCPATH > [extensions] > verbosemmap=$TESTTMP/verbosemmap.py > EOF mmap index which is now more than 4k long $ hg log -l 5 -T '{rev}\n' --config experimental.mmapindexthreshold=4k mmapping $TESTTMP/a/.hg/store/00changelog.i 100 99 98 97 96 do not mmap index which is still less than 32k $ hg log -l 5 -T '{rev}\n' --config experimental.mmapindexthreshold=32k 100 99 98 97 96 $ cd ..