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remotephase: fast path newheads computation in simple case (issue5964)...
remotephase: fast path newheads computation in simple case (issue5964) Changeset 88efb7d6bcb6 fixed the logic of `phases.newheads` but greatly regressed its performance (up to many order of magnitude). The first step to fix the regression is to exit early when there is no work to do. If there are no heads to filter or not roots to filter them, we don't have to do any work. This fixes the regression when talking to an all public changeset. The performance is even better than before. pypy, compared to an all public repo ------------------------------------ 8eeed92475d5: 0.005758 seconds 88efb7d6bcb6: 0.602517 seconds (x104) this code: 0.001508 seconds (-74% from base) mercurial compared to an all public repo ---------------------------------------- 8eeed92475d5: 0.000577 seconds 88efb7d6bcb6: 0.185316 seconds (x321) this code: 0.000150 seconds (-74% from base) The performance of newheads, when actual computations are required, is fixed in the next changeset.

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revset.py
53 lines | 1.6 KiB | text/x-python | PythonLexer
# revset.py - asv revset benchmarks
#
# Copyright 2016 Logilab SA <contact@logilab.fr>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''ASV revset benchmarks generated from contrib/base-revsets.txt
Each revset benchmark is parameterized with variants (first, last, sort, ...)
'''
from __future__ import absolute_import
import os
import string
import sys
from . import basedir, perfbench
def createrevsetbenchmark(baseset, variants=None):
if variants is None:
# Default variants
variants = ["plain", "first", "last", "sort", "sort+first",
"sort+last"]
fname = "track_" + "_".join("".join([
c if c in string.digits + string.letters else " "
for c in baseset
]).split())
def wrap(fname, baseset):
@perfbench(name=baseset, params=[("variant", variants)])
def f(perf, variant):
revset = baseset
if variant != "plain":
for var in variant.split("+"):
revset = "%s(%s)" % (var, revset)
return perf("perfrevset", revset)
f.__name__ = fname
return f
return wrap(fname, baseset)
def initializerevsetbenchmarks():
mod = sys.modules[__name__]
with open(os.path.join(basedir, 'contrib', 'base-revsets.txt'),
'rb') as fh:
for line in fh:
baseset = line.strip()
if baseset and not baseset.startswith('#'):
func = createrevsetbenchmark(baseset)
setattr(mod, func.__name__, func)
initializerevsetbenchmarks()