view contrib/perf-utils/search-discovery-case @ 48598:a6f16ec07ed7

stream-clone: add a explicit test for format change during stream clone

They are different kind of requirements, the one which impact the data storage
and are relevant to the files being streamed and the one which does not. For
example some requirements are only relevant to the working copy, like sparse, or
dirstate-v2.

Since they are irrelevant to the content being streamed, they do not prevent the
receiving side to use streaming clone and mercurial skip adverting them over
the wire and, ideally, within the bundle.

In addition, this let the client decide to use whichever format it desire for
the part that does not affect the store itself. So the configuration related to
these format are used as normal when doing a streaming clone.

In practice, the feature was not really tested and is badly broken with bundle-2,
since the requirements are not filtered out from the stream bundle.

So we start with adding simple tests as a good base before the fix and adjust
the feature.

Differential Revision: https://phab.mercurial-scm.org/D12029

#!/usr/bin/env python3
# Search for interesting discovery instance
#
#  search-discovery-case REPO [REPO]…
#
# This use a subsetmaker extension (next to this script) to generate a steam of
# random discovery instance. When interesting case are discovered, information
# about them are print on the stdout.
from __future__ import print_function

import json
import os
import queue
import random
import signal
import subprocess
import sys
import threading

this_script = os.path.abspath(sys.argv[0])
this_dir = os.path.dirname(this_script)
hg_dir = os.path.join(this_dir, '..', '..')
HG_REPO = os.path.normpath(hg_dir)
HG_BIN = os.path.join(HG_REPO, 'hg')

JOB = int(os.environ.get('NUMBER_OF_PROCESSORS', 8))


SLICING = ('scratch', 'randomantichain', 'rev')


def nb_revs(repo_path):
    cmd = [
        HG_BIN,
        '--repository',
        repo_path,
        'log',
        '--template',
        '{rev}',
        '--rev',
        'tip',
    ]
    s = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    out, err = s.communicate()
    return int(out)


repos = []
for repo in sys.argv[1:]:
    size = nb_revs(repo)
    repos.append((repo, size))


def pick_one(repo):
    pick = random.choice(SLICING)
    seed = random.randint(0, 100000)
    if pick == 'scratch':
        start = int(repo[1] * 0.3)
        end = int(repo[1] * 0.7)
        nb = random.randint(start, end)
        return ('scratch', nb, seed)
    elif pick == 'randomantichain':
        return ('randomantichain', seed)
    elif pick == 'rev':
        start = int(repo[1] * 0.3)
        end = int(repo[1])
        rev = random.randint(start, end)
        return ('rev', rev)
    else:
        assert False


done = threading.Event()
cases = queue.Queue(maxsize=10 * JOB)
results = queue.Queue()


def worker():
    while not done.is_set():
        c = cases.get()
        if c is None:
            return
        try:
            res = process(c)
            results.put((c, res))
        except Exception as exc:
            print('processing-failed: %s %s' % (c, exc), file=sys.stderr)
        c = (c[0], c[2], c[1])
        try:
            res = process(c)
            results.put((c, res))
        except Exception as exc:
            print('processing-failed: %s %s' % (c, exc), file=sys.stderr)


SUBSET_PATH = os.path.join(HG_REPO, 'contrib', 'perf-utils', 'subsetmaker.py')


CMD_BASE = (
    HG_BIN,
    'debugdiscovery',
    '--template',
    'json',
    '--config',
    'extensions.subset=%s' % SUBSET_PATH,
)
#    '--local-as-revs "$left" --local-as-revs "$right"'
#    > /data/discovery-references/results/disco-mozilla-unified-$1-$2.txt
#        )


def to_revsets(case):
    t = case[0]
    if t == 'scratch':
        return 'not scratch(all(), %d, "%d")' % (case[1], case[2])
    elif t == 'randomantichain':
        return '::randomantichain(all(), "%d")' % case[1]
    elif t == 'rev':
        return '::%d' % case[1]
    else:
        assert False


def process(case):
    (repo, left, right) = case
    cmd = list(CMD_BASE)
    cmd.append('-R')
    cmd.append(repo[0])
    cmd.append('--local-as-revs')
    cmd.append(to_revsets(left))
    cmd.append('--remote-as-revs')
    cmd.append(to_revsets(right))
    s = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    out, err = s.communicate()
    return json.loads(out)[0]


def interesting_boundary(res):
    """check if a case is interesting or not

    For now we are mostly interrested in case were we do multiple roundstrip
    and where the boundary is somewhere in the middle of the undecided set.

    Ideally, we would make this configurable, but this is not a focus for now

    return None or (round-trip, undecided-common, undecided-missing)
    """
    roundtrips = res["total-roundtrips"]
    if roundtrips <= 1:
        return None
    undecided_common = res["nb-ini_und-common"]
    undecided_missing = res["nb-ini_und-missing"]
    if undecided_common == 0:
        return None
    if undecided_missing == 0:
        return None
    return (roundtrips, undecided_common, undecided_missing)


def end(*args, **kwargs):
    done.set()


def format_case(case):
    return '-'.join(str(s) for s in case)


signal.signal(signal.SIGINT, end)

for i in range(JOB):
    threading.Thread(target=worker).start()

nb_cases = 0
while not done.is_set():
    repo = random.choice(repos)
    left = pick_one(repo)
    right = pick_one(repo)
    cases.put((repo, left, right))
    while not results.empty():
        # results has a single reader so this is fine
        c, res = results.get_nowait()
        boundary = interesting_boundary(res)
        if boundary is not None:
            print(c[0][0], format_case(c[1]), format_case(c[2]), *boundary)
            sys.stdout.flush()

    nb_cases += 1
    if not nb_cases % 100:
        print('[%d cases generated]' % nb_cases, file=sys.stderr)

for i in range(JOB):
    try:
        cases.put_nowait(None)
    except queue.Full:
        pass

print('[%d cases generated]' % nb_cases, file=sys.stderr)
print('[ouput generation is over]' % nb_cases, file=sys.stderr)