/brz/remove-bazaar

#!/usr/bin/env python

import random

import os

import time

import sys

import optparse

from bzrlib import (

    branch,

    commands,

    graph,

    ui,

    trace,

    _known_graph_py,

    _known_graph_pyx,

    )

from bzrlib.ui import text

p = optparse.OptionParser()

p.add_option('--quick', default=False, action='store_true')

p.add_option('--max-combinations', default=500, type=int)

p.add_option('--lsprof', default=None, type=str)

opts, args = p.parse_args(sys.argv[1:])

trace.enable_default_logging()

ui.ui_factory = text.TextUIFactory()

begin = time.clock()

if len(args) >= 1:

    b = branch.Branch.open(args[0])

else:

    b = branch.Branch.open('.')

b.lock_read()

try:

    g = b.repository.get_graph()

    parent_map = dict(p for p in g.iter_ancestry([b.last_revision()])

                         if p[1] is not None)

finally:

    b.unlock()

end = time.clock()

print 'Found %d nodes, loaded in %.3fs' % (len(parent_map), end - begin)

def all_heads_comp(g, combinations):

    h = []

    pb = ui.ui_factory.nested_progress_bar()

    try:

        for idx, combo in enumerate(combinations):

            if idx & 0x1f == 0:

                pb.update('proc', idx, len(combinations))

            h.append(g.heads(combo))

    finally:

        pb.finished()

    return h

combinations = []

# parents = parent_map.keys()

# for p1 in parents:

#     for p2 in random.sample(parents, 10):

#         combinations.append((p1, p2))

# Times for random sampling of 10x1150 of bzrtools

#   Graph        KnownGraph

#   96.1s   vs   25.7s  :)

# Times for 500 'merge parents' from bzr.dev

#   25.6s   vs   45.0s  :(

for revision_id, parent_ids in parent_map.iteritems():

    if parent_ids is not None and len(parent_ids) > 1:

        combinations.append(parent_ids)

# The largest portion of the graph that has to be walked for a heads() check

# combinations = [('john@arbash-meinel.com-20090312021943-tu6tcog48aiujx4s',

#                  'john@arbash-meinel.com-20090312130552-09xa2xsitf6rilzc')]

if opts.max_combinations > 0 and len(combinations) > opts.max_combinations:

    combinations = random.sample(combinations, opts.max_combinations)

print '      %d combinations' % (len(combinations),)

def combi_graph(graph_klass, comb):

    # DEBUG

    graph._counters[1] = 0

    graph._counters[2] = 0

    begin = time.clock()

    g = graph_klass(parent_map)

    if opts.lsprof is not None:

        heads = commands.apply_lsprofiled(opts.lsprof, all_heads_comp, g, comb)

    else:

        heads = all_heads_comp(g, comb)

    end = time.clock()

    return dict(elapsed=(end - begin), graph=g, heads=heads)

def report(name, g):

    print '%s: %.3fs' % (name, g['elapsed'])

    counters_used = False

    for c in graph._counters:

        if c:

            counters_used = True

    if counters_used:

        print '  %s' % (graph._counters,)

known_python = combi_graph(_known_graph_py.KnownGraph, combinations)

report('Known', known_python)

known_pyrex = combi_graph(_known_graph_pyx.KnownGraph, combinations)

report('Known (pyx)', known_pyrex)

def _simple_graph(parent_map):

    return graph.Graph(graph.DictParentsProvider(parent_map))

if opts.quick:

    if known_python['heads'] != known_pyrex['heads']:

        import pdb; pdb.set_trace()

    print 'ratio: %.1f:1 faster' % (

        known_python['elapsed'] / known_pyrex['elapsed'],)

else:

    orig = combi_graph(_simple_graph, combinations)

    report('Orig', orig)

    if orig['heads'] != known_pyrex['heads']:

        import pdb; pdb.set_trace()

    print 'ratio: %.1f:1 faster' % (

        orig['elapsed'] / known_pyrex['elapsed'],)