revlog: use LRU for the chain cache
For a large repository, this reduces the number of filelog instances and
associated data a lot. For a 1% speed penalty, it reduces peak RSS by
20% for the full NetBSD test repository.
Differential Revision: https://phab.mercurial-scm.org/D9235
A python hook for "hg fix" that prints out the number of files and revisions
that were affected, along with which fixer tools were applied. Also checks how
many times it sees a specific key generated by one of the fixer tools defined
below.
$ cat >> $TESTTMP/postfixhook.py <<EOF
> import collections
> def file(ui, repo, rev=None, path=b'', metadata=None, **kwargs):
> ui.status(b'fixed %s in revision %d using %s\n' %
> (path, rev, b', '.join(metadata.keys())))
> def summarize(ui, repo, replacements=None, wdirwritten=False,
> metadata=None, **kwargs):
> counts = collections.defaultdict(int)
> keys = 0
> for fixername, metadatalist in metadata.items():
> for metadata in metadatalist:
> if metadata is None:
> continue
> counts[fixername] += 1
> if 'key' in metadata:
> keys += 1
> ui.status(b'saw "key" %d times\n' % (keys,))
> for name, count in sorted(counts.items()):
> ui.status(b'fixed %d files with %s\n' % (count, name))
> if replacements:
> ui.status(b'fixed %d revisions\n' % (len(replacements),))
> if wdirwritten:
> ui.status(b'fixed the working copy\n')
> EOF
Some mock output for fixer tools that demonstrate what could go wrong with
expecting the metadata output format.
$ printf 'new content\n' > $TESTTMP/missing
$ printf 'not valid json\0new content\n' > $TESTTMP/invalid
$ printf '{"key": "value"}\0new content\n' > $TESTTMP/valid
Configure some fixer tools based on the output defined above, and enable the
hooks defined above. Disable parallelism to make output of the parallel file
processing phase stable.
$ cat >> $HGRCPATH <<EOF
> [extensions]
> fix =
> [fix]
> metadatafalse:command=cat $TESTTMP/missing
> metadatafalse:pattern=metadatafalse
> metadatafalse:metadata=false
> missing:command=cat $TESTTMP/missing
> missing:pattern=missing
> missing:metadata=true
> invalid:command=cat $TESTTMP/invalid
> invalid:pattern=invalid
> invalid:metadata=true
> valid:command=cat $TESTTMP/valid
> valid:pattern=valid
> valid:metadata=true
> [hooks]
> postfixfile = python:$TESTTMP/postfixhook.py:file
> postfix = python:$TESTTMP/postfixhook.py:summarize
> [worker]
> enabled=false
> EOF
See what happens when we execute each of the fixer tools. Some print warnings,
some write back to the file.
$ hg init repo
$ cd repo
$ printf "old content\n" > metadatafalse
$ printf "old content\n" > invalid
$ printf "old content\n" > missing
$ printf "old content\n" > valid
$ hg add -q
$ hg fix -w
ignored invalid output from fixer tool: invalid
fixed metadatafalse in revision 2147483647 using metadatafalse
ignored invalid output from fixer tool: missing
fixed valid in revision 2147483647 using valid
saw "key" 1 times
fixed 1 files with valid
fixed the working copy
$ cat metadatafalse
new content
$ cat missing
old content
$ cat invalid
old content
$ cat valid
new content
$ cd ..