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Viewing changes to bzrlib/plugins/multiparent.py

  • Committer: Canonical.com Patch Queue Manager
  • Date: 2007-06-28 07:08:27 UTC
  • mfrom: (2553.1.3 integration)
  • Revision ID: pqm@pqm.ubuntu.com-20070628070827-h5s313dg5tnag9vj
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bzrlib/plugins/multiparent.py
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"""Implementation of multiparent diffs for versionedfile-like storage
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Provides mp-regen and mp-extract commands.
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Focus is on comparing size/performance to knits.
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"""
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from bzrlib.lazy_import import lazy_import
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lazy_import(globals(), """
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import (
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        errno,
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        os,
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        sys,
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        time,
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        )
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from bzrlib import (
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    commands,
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    urlutils
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    )
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from bzrlib.workingtree import WorkingTree
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from bzrlib.tests import TestUtil
23
 
 
24
 
from bzrlib.plugins.multiparent.multiparent import (
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    MultiVersionedFile,
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    MultiMemoryVersionedFile,
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    )
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""")
29
 
 
30
 
class cmd_mp_regen(commands.Command):
31
 
    """Generate a multiparent versionedfile"""
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    hidden = True
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35
 
    takes_args = ['file?']
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37
 
    takes_options = [commands.Option('sync-snapshots',
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                                     help='Snapshots follow source.'),
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                     commands.Option('snapshot-interval', type=int,
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                                     help='Take snapshots every x revisions.'),
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                     commands.Option('outfile', type=unicode,
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                                     help='Write pseudo-knit to this file.'),
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                     commands.Option('memory', help='Use memory, not disk.'),
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                     commands.Option('extract', help='Test extract time.'),
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                     commands.Option('single', help='Use a single parent.'),
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                     commands.Option('verify', help='Verify added texts.'),
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                     commands.Option('cache', help='Aggresively cache.'),
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                     commands.Option('size', help='Aggressive size.'),
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                     commands.Option('build', help='Aggressive build.'),
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                    ]
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    hidden = True
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53
 
    def run(self, file=None, sync_snapshots=False, snapshot_interval=26,
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            lsprof_timed=False, dump=False, extract=False, single=False,
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            verify=False, outfile=None, memory=False, cache=False,
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            size=False, build=False):
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        file_weave = get_file_weave(file)
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        url = file_weave.transport.abspath(file_weave.filename)
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        print >> sys.stderr, 'Importing: %s' % \
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            urlutils.local_path_from_url(url)
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        if sync_snapshots:
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            print >> sys.stderr, 'Snapshots follow input'
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        else:
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            print >> sys.stderr, 'Snapshot interval: %d' % snapshot_interval
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        if not memory:
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            if outfile is None:
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                filename = 'pknit'
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            else:
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                filename = outfile
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            vf = MultiVersionedFile(filename, snapshot_interval)
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        else:
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            vf = MultiMemoryVersionedFile(snapshot_interval)
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        vf.destroy()
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        old_snapshots = set(r for r in file_weave.versions() if
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                        file_weave._index.get_method(r) == 'fulltext')
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        if sync_snapshots:
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            to_sync = old_snapshots
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        elif size or build:
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            assert memory
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            to_sync = set()
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        else:
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            to_sync = vf.select_snapshots(file_weave)
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        print >> sys.stderr, "%d fulltext(s)" % len(old_snapshots)
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        print >> sys.stderr, "%d planned snapshots" % len(to_sync)
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        try:
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            vf.import_versionedfile(file_weave, to_sync, single_parent=single,
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                                    verify=verify, no_cache=not cache)
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            if size:
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                snapshots = vf.select_by_size(len(old_snapshots))
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                for version_id in snapshots:
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                    vf.make_snapshot(version_id)
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            if build:
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                ranking = vf.get_build_ranking()
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                snapshots = ranking[:len(old_snapshots) -\
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                    len(vf._snapshots)]
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                for version_id in snapshots:
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                    vf.make_snapshot(version_id)
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        except:
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            vf.destroy()
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            raise
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        try:
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            print >> sys.stderr, "%d actual snapshots" % len(vf._snapshots)
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            if not cache:
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                vf.clear_cache()
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            if memory:
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                if outfile is not None:
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                    vf_file = MultiVersionedFile(outfile)
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                vf_file.import_diffs(vf)
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            else:
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                vf_file = vf
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        finally:
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            if outfile is None:
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                vf.destroy()
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            else:
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                vf_file.save()
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class cmd_mp_extract(commands.Command):
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    """Test extraction time multiparent knits"""
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    hidden = True
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    takes_options = [
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        commands.Option('lsprof-timed', help='Use lsprof.'),
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        commands.Option('parallel', help='Extract multiple versions at once.'),
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        commands.Option('count', help='Number of cycles to do.', type=int),
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        ]
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129
 
    takes_args = ['filename', 'vfile?']
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    def run(self, filename, vfile=None, lsprof_timed=False, count=1000,
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            parallel=False):
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        vf = MultiVersionedFile(filename)
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        vf.load()
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        snapshots = [r for r in vf.versions() if vf.get_diff(r).is_snapshot()]
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        print '%d snapshots' % len(snapshots)
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        revisions = list(vf.versions())
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        revisions = revisions[-count:]
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        print 'Testing extract time of %d revisions' % len(revisions)
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        if parallel:
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            revisions_list = [revisions]
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        else:
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            revisions_list = [[r] for r in revisions]
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        start = time.clock()
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        for revisions in revisions_list:
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            vf = MultiVersionedFile(filename)
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            vf.load()
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            vf.get_line_list(revisions)
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        print >> sys.stderr, time.clock() - start
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        if lsprof_timed:
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            from bzrlib.lsprof import profile
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            vf.clear_cache()
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            ret, stats = profile(vf.get_line_list, revisions_list[-1][-1])
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            stats.sort()
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            stats.pprint()
156
 
        start = time.clock()
157
 
        for revisions in revisions_list:
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            file_weave = get_file_weave(vfile)
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            file_weave.get_line_list(revisions)
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        print >> sys.stderr, time.clock() - start
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162
 
 
163
 
def get_file_weave(filename=None, wt=None):
164
 
    if filename is None:
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        wt, path = WorkingTree.open_containing('.')
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        return wt.branch.repository.get_inventory_weave()
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    else:
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        wt, path = WorkingTree.open_containing(filename)
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        file_id = wt.path2id(path)
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        bt = wt.branch.repository.revision_tree(wt.last_revision())
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        return bt.get_weave(file_id)
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173
 
 
174
 
commands.register_command(cmd_mp_regen)
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commands.register_command(cmd_mp_extract)