view mercurial/revlogutils/constants.py @ 39627:ee7ee0c516ca

narrow: intersect provided matcher with narrowmatcher in `hg diff`

This provides significant speedups when running diff, and no change in behavior
that I'm aware of (or that the tests found). I tested with a repo that I started
using narrow in after it was created and attempted to run `hg diff -c .` and
similar commands in it on a commit that had files not in the narrowspec.

Timing numbers below, using a similar setup as my previous commits.
before=9db85644, m-u is mozilla-unified at eb39298e432d (flatmanifest) and
0553b7f29eaf (treemanifest). l-d-r is a repo simulating a situation I've
encountered where there's one directory with 30k+ subdirectories. N means
narrow, T means treemanifest. The narrowspec is pretty small when in use, and
importantly the narrowspec is applied *after* doing the initial checkout
(without narrowing), so all of these files exist in the filesystem, which is not
normally the case if someone has been using narrow for the entire life of the
clone.

Anything less than a 5% difference in performance is most likely noise.

    diff --git:
    repo  | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before
    ------+---+---+------------------------+-----------------------+------------
    m-u   |   |   | 1.292 s +-  0.009 s    | 1.295 s +-  0.010 s   | 100.2%
    m-u   |   | x | 1.296 s +-  0.042 s    | 1.299 s +-  0.026 s   | 100.2%
    m-u   | x |   | 1.292 s +-  0.010 s    | 1.297 s +-  0.021 s   | 100.4%
    m-u   | x | x | 84.2 ms +-   1.2 ms    | 83.6 ms +-   0.2 ms   |  99.3%
    l-d-r |   |   | 188.7 ms +-   2.7 ms   | 188.8 ms +-   2.0 ms  | 100.1%
    l-d-r |   | x | 189.9 ms +-   1.5 ms   | 189.4 ms +-   1.2 ms  |  99.7%
    l-d-r | x |   | 97.1 ms +-   1.0 ms    | 87.1 ms +-   1.0 ms   |  89.7% <--
    l-d-r | x | x | 96.9 ms +-   0.8 ms    | 87.2 ms +-   0.7 ms   |  90.0% <--

    diff -c . --git:
    repo  | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before
    ------+---+---+------------------------+-----------------------+------------
    m-u   |   |   | 231.6 ms +-   3.1 ms   | 228.9 ms +-   1.6 ms  |  98.8%
    m-u   |   | x | 150.5 ms +-   1.7 ms   | 150.7 ms +-   1.4 ms  | 100.1%
    m-u   | x |   | 233.7 ms +-   2.4 ms   | 232.2 ms +-   1.9 ms  |  99.4%
    m-u   | x | x | 126.1 ms +-   1.2 ms   | 126.8 ms +-   1.2 ms  | 100.6%
    l-d-r |   |   | 82.1 ms +-   2.0 ms    | 81.8 ms +-   1.4 ms   |  99.6%
    l-d-r |   | x | 3.732 s +-  0.020 s    | 3.746 s +-  0.027 s   | 100.4%
    l-d-r | x |   | 83.1 ms +-   0.8 ms    | 107.6 ms +-   2.4 ms  | 129.5% <--
    l-d-r | x | x | 758.2 ms +-  38.8 ms   | 188.5 ms +-   1.8 ms  |  24.9% <--

    rebase -r . --keep -d .^^:
    repo  | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before
    ------+---+---+------------------------+-----------------------+------------
    m-u   |   |   | 5.532 s +-  0.087 s    | 5.496 s +-  0.016 s   |  99.3%
    m-u   |   | x | 5.554 s +-  0.061 s    | 5.532 s +-  0.013 s   |  99.6%
    m-u   | x |   | 5.602 s +-  0.134 s    | 5.508 s +-  0.035 s   |  98.3%
    m-u   | x | x | 582.2 ms +-  15.2 ms   | 572.9 ms +-  12.0 ms  |  98.4%
    l-d-r |   |   | 629.5 ms +-  12.3 ms   | 622.5 ms +-   7.3 ms  |  98.9%
    l-d-r |   | x | 6.173 s +-  0.062 s    | 6.185 s +-  0.076 s   | 100.2%
    l-d-r | x |   | 274.5 ms +-  10.0 ms   | 272.1 ms +-   6.2 ms  |  99.1%
    l-d-r | x | x | 4.835 s +-  0.056 s    | 4.826 s +-  0.034 s   |  99.8%

    status --change . --copies:
    repo  | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before
    ------+---+---+------------------------+-----------------------+------------
    m-u   |   |   | 214.4 ms +-   1.4 ms   | 212.2 ms +-   1.7 ms  |  99.0%
    m-u   |   | x | 130.9 ms +-   1.2 ms   | 131.7 ms +-   1.1 ms  | 100.6%
    m-u   | x |   | 215.0 ms +-   2.1 ms   | 214.9 ms +-   2.7 ms  | 100.0%
    m-u   | x | x | 109.5 ms +-   2.3 ms   | 107.8 ms +-   0.9 ms  |  98.4%
    l-d-r |   |   | 79.6 ms +-   0.9 ms    | 79.8 ms +-   1.6 ms   | 100.3%
    l-d-r |   | x | 3.799 s +-  0.037 s    | 3.928 s +-  0.021 s   | 103.4% <--?
    l-d-r | x |   | 82.7 ms +-   0.7 ms    | 83.2 ms +-   1.0 ms   | 100.6%
    l-d-r | x | x | 746.8 ms +-   6.1 ms   | 739.0 ms +-   4.2 ms  |  99.0%

    status --copies:
    repo  | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before
    ------+---+---+------------------------+-----------------------+------------
    m-u   |   |   | 1.884 s +-  0.012 s    | 1.885 s +-  0.013 s   | 100.1%
    m-u   |   | x | 1.897 s +-  0.027 s    | 1.909 s +-  0.077 s   | 100.6%
    m-u   | x |   | 1.886 s +-  0.021 s    | 1.891 s +-  0.030 s   | 100.3%
    m-u   | x | x | 92.0 ms +-   0.7 ms    | 92.4 ms +-   0.4 ms   | 100.4%
    l-d-r |   |   | 570.3 ms +-  18.7 ms   | 552.2 ms +-   4.5 ms  |  96.8%
    l-d-r |   | x | 568.9 ms +-  16.1 ms   | 567.2 ms +-  11.9 ms  |  99.7%
    l-d-r | x |   | 171.1 ms +-   2.5 ms   | 170.4 ms +-   1.2 ms  |  99.6%
    l-d-r | x | x | 171.6 ms +-   3.4 ms   | 171.5 ms +-   1.7 ms  |  99.9%

    update $rev^; ~/src/hg/hg{hg}/hg update $rev:
    repo  | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before
    ------+---+---+------------------------+-----------------------+------------
    m-u   |   |   | 3.107 s +-  0.017 s    | 3.116 s +-  0.012 s   | 100.3%
    m-u   |   | x | 2.943 s +-  0.010 s    | 2.945 s +-  0.019 s   | 100.1%
    m-u   | x |   | 3.116 s +-  0.033 s    | 3.118 s +-  0.027 s   | 100.1%
    m-u   | x | x | 318.5 ms +-   2.7 ms   | 320.8 ms +-   4.8 ms  | 100.7%
    l-d-r |   |   | 428.9 ms +-   4.4 ms   | 429.5 ms +-   4.0 ms  | 100.1%
    l-d-r |   | x | 9.593 s +-  0.081 s    | 9.869 s +-  0.043 s   | 102.9%
    l-d-r | x |   | 253.2 ms +-   3.6 ms   | 254.0 ms +-   2.8 ms  | 100.3%
    l-d-r | x | x | 1.613 s +-  0.009 s    | 1.630 s +-  0.017 s   | 101.1%

Differential Revision: https://phab.mercurial-scm.org/D4587

# revlogdeltas.py - constant used for revlog logic
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
# Copyright 2018 Octobus <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
"""Helper class to compute deltas stored inside revlogs"""

from __future__ import absolute_import

from .. import (
    util,
)

# revlog header flags
REVLOGV0 = 0
REVLOGV1 = 1
# Dummy value until file format is finalized.
# Reminder: change the bounds check in revlog.__init__ when this is changed.
REVLOGV2 = 0xDEAD
FLAG_INLINE_DATA = (1 << 16)
FLAG_GENERALDELTA = (1 << 17)
REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA
REVLOG_DEFAULT_FORMAT = REVLOGV1
REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS
REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA
REVLOGV2_FLAGS = REVLOGV1_FLAGS

# revlog index flags
REVIDX_ISCENSORED = (1 << 15) # revision has censor metadata, must be verified
REVIDX_ELLIPSIS = (1 << 14) # revision hash does not match data (narrowhg)
REVIDX_EXTSTORED = (1 << 13) # revision data is stored externally
REVIDX_DEFAULT_FLAGS = 0
# stable order in which flags need to be processed and their processors applied
REVIDX_FLAGS_ORDER = [
    REVIDX_ISCENSORED,
    REVIDX_ELLIPSIS,
    REVIDX_EXTSTORED,
]
REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER)
# bitmark for flags that could cause rawdata content change
REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED

SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000