nodemap: introduce append-only incremental update of the persistent data
Rewriting the full nodemap for each transaction has a cost we would like to
avoid. We introduce a new way to write persistent nodemap data by adding new
information at the end for file. Any new and updated block as added at the end
of the file. The last block is the new root node.
With this method, some of the block already on disk get "dereferenced" and
become dead data. In later changesets, We'll start tracking the amount of dead
data to eventually re-generate a full nodemap.
Differential Revision: https://phab.mercurial-scm.org/D7886
Test basic extension support
$ cat > foobar.py <<EOF
> import os
> from mercurial import commands, registrar
> cmdtable = {}
> command = registrar.command(cmdtable)
> configtable = {}
> configitem = registrar.configitem(configtable)
> configitem(b'tests', b'foo', default=b"Foo")
> def uisetup(ui):
> ui.debug(b"uisetup called [debug]\\n")
> ui.write(b"uisetup called\\n")
> ui.status(b"uisetup called [status]\\n")
> ui.flush()
> def reposetup(ui, repo):
> ui.write(b"reposetup called for %s\\n" % os.path.basename(repo.root))
> ui.write(b"ui %s= repo.ui\\n" % (ui == repo.ui and b"=" or b"!"))
> ui.flush()
> @command(b'foo', [], b'hg foo')
> def foo(ui, *args, **kwargs):
> foo = ui.config(b'tests', b'foo')
> ui.write(foo)
> ui.write(b"\\n")
> @command(b'bar', [], b'hg bar', norepo=True)
> def bar(ui, *args, **kwargs):
> ui.write(b"Bar\\n")
> EOF
$ abspath=`pwd`/foobar.py
$ mkdir barfoo
$ cp foobar.py barfoo/__init__.py
$ barfoopath=`pwd`/barfoo
$ hg init a
$ cd a
$ echo foo > file
$ hg add file
$ hg commit -m 'add file'
$ echo '[extensions]' >> $HGRCPATH
$ echo "foobar = $abspath" >> $HGRCPATH
$ filterlog () {
> sed -e 's!^[0-9/]* [0-9:]* ([0-9]*)>!YYYY/MM/DD HH:MM:SS (PID)>!'
> }
Test extension setup timings
$ hg foo --traceback --config devel.debug.extensions=yes --debug 2>&1 | filterlog
YYYY/MM/DD HH:MM:SS (PID)> loading extensions
YYYY/MM/DD HH:MM:SS (PID)> - processing 1 entries
YYYY/MM/DD HH:MM:SS (PID)> - loading extension: foobar
YYYY/MM/DD HH:MM:SS (PID)> > foobar extension loaded in * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - validating extension tables: foobar
YYYY/MM/DD HH:MM:SS (PID)> - invoking registered callbacks: foobar
YYYY/MM/DD HH:MM:SS (PID)> > callbacks completed in * (glob)
YYYY/MM/DD HH:MM:SS (PID)> > loaded 1 extensions, total time * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - loading configtable attributes
YYYY/MM/DD HH:MM:SS (PID)> - executing uisetup hooks
YYYY/MM/DD HH:MM:SS (PID)> - running uisetup for foobar
uisetup called [debug]
uisetup called
uisetup called [status]
YYYY/MM/DD HH:MM:SS (PID)> > uisetup for foobar took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> > all uisetup took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - executing extsetup hooks
YYYY/MM/DD HH:MM:SS (PID)> - running extsetup for foobar
YYYY/MM/DD HH:MM:SS (PID)> > extsetup for foobar took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> > all extsetup took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - executing remaining aftercallbacks
YYYY/MM/DD HH:MM:SS (PID)> > remaining aftercallbacks completed in * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - loading extension registration objects
YYYY/MM/DD HH:MM:SS (PID)> > extension registration object loading took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> > extension foobar take a total of * to load (glob)
YYYY/MM/DD HH:MM:SS (PID)> extension loading complete
YYYY/MM/DD HH:MM:SS (PID)> loading additional extensions
YYYY/MM/DD HH:MM:SS (PID)> - processing 1 entries
YYYY/MM/DD HH:MM:SS (PID)> > loaded 0 extensions, total time * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - loading configtable attributes
YYYY/MM/DD HH:MM:SS (PID)> - executing uisetup hooks
YYYY/MM/DD HH:MM:SS (PID)> > all uisetup took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - executing extsetup hooks
YYYY/MM/DD HH:MM:SS (PID)> > all extsetup took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - executing remaining aftercallbacks
YYYY/MM/DD HH:MM:SS (PID)> > remaining aftercallbacks completed in * (glob)
YYYY/MM/DD HH:MM:SS (PID)> - loading extension registration objects
YYYY/MM/DD HH:MM:SS (PID)> > extension registration object loading took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> extension loading complete
YYYY/MM/DD HH:MM:SS (PID)> - executing reposetup hooks
YYYY/MM/DD HH:MM:SS (PID)> - running reposetup for foobar
reposetup called for a
ui == repo.ui
YYYY/MM/DD HH:MM:SS (PID)> > reposetup for foobar took * (glob)
YYYY/MM/DD HH:MM:SS (PID)> > all reposetup took * (glob)
Foo
$ cd ..
$ echo 'foobar = !' >> $HGRCPATH