obsolete: order of magnitude speedup in _computebumpedset
Reminder: a changeset is said "bumped" if it tries to obsolete a immutable
changeset.
The previous algorithm for computing bumped changeset was:
1) Get all public changesets
2) Find all they successors
3) Search for stuff that are eligible for being "bumped"
(mutable and non obsolete)
The entry size of this algorithm is `O(len(public))` which is mostly the same as
`O(len(repo))`. Even this this approach mean fewer obsolescence marker are
traveled, this is not very scalable.
The new algorithm is:
1) For each potential bumped changesets (non obsolete mutable)
2) iterate over precursors
3) if a precursors is public. changeset is bumped
We travel more obsolescence marker, but the entry size is much smaller since
the amount of potential bumped should remains mostly stable with time `O(1)`.
On some confidential gigantic repo this move bumped computation from 15.19s to
0.46s (×33 speedup…). On "smaller" repo (mercurial, cubicweb's review) no
significant gain were seen. The additional traversal of obsolescence marker is
probably probably counter balance the advantage of it.
Other optimisation could be done in the future (eg: sharing precursors cache
for divergence detection)
Summary: A fast, lightweight Source Control Management system
Name: mercurial
Version: snapshot
Release: 0
License: GPLv2+
Group: Development/Tools
URL: http://mercurial.selenic.com/
Source0: http://mercurial.selenic.com/release/%{name}-%{version}.tar.gz
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
# From the README:
#
# Note: some distributions fails to include bits of distutils by
# default, you'll need python-dev to install. You'll also need a C
# compiler and a 3-way merge tool like merge, tkdiff, or kdiff3.
#
# python-devel provides an adequate python-dev. The merge tool is a
# run-time dependency.
#
BuildRequires: python >= 2.4, python-devel, make, gcc, python-docutils >= 0.5, gettext
Provides: hg = %{version}-%{release}
Requires: python >= 2.4
# The hgk extension uses the wish tcl interpreter, but we don't enforce it
#Requires: tk
%define pythonver %(python -c 'import sys;print ".".join(map(str, sys.version_info[:2]))')
%define emacs_lispdir %{_datadir}/emacs/site-lisp
%description
Mercurial is a fast, lightweight source control management system designed
for efficient handling of very large distributed projects.
%prep
%setup -q
%build
make all
%install
rm -rf $RPM_BUILD_ROOT
make install DESTDIR=$RPM_BUILD_ROOT PREFIX=%{_prefix} MANDIR=%{_mandir}
install -m 755 contrib/hgk $RPM_BUILD_ROOT%{_bindir}
install -m 755 contrib/hg-ssh $RPM_BUILD_ROOT%{_bindir}
bash_completion_dir=$RPM_BUILD_ROOT%{_sysconfdir}/bash_completion.d
mkdir -p $bash_completion_dir
install -m 644 contrib/bash_completion $bash_completion_dir/mercurial.sh
zsh_completion_dir=$RPM_BUILD_ROOT%{_datadir}/zsh/site-functions
mkdir -p $zsh_completion_dir
install -m 644 contrib/zsh_completion $zsh_completion_dir/_mercurial
mkdir -p $RPM_BUILD_ROOT%{emacs_lispdir}
install -m 644 contrib/mercurial.el $RPM_BUILD_ROOT%{emacs_lispdir}
install -m 644 contrib/mq.el $RPM_BUILD_ROOT%{emacs_lispdir}
mkdir -p $RPM_BUILD_ROOT/%{_sysconfdir}/mercurial/hgrc.d
install -m 644 contrib/mergetools.hgrc $RPM_BUILD_ROOT%{_sysconfdir}/mercurial/hgrc.d/mergetools.rc
%clean
rm -rf $RPM_BUILD_ROOT
%files
%defattr(-,root,root,-)
%doc CONTRIBUTORS COPYING doc/README doc/hg*.txt doc/hg*.html *.cgi contrib/*.fcgi
%doc %attr(644,root,root) %{_mandir}/man?/hg*
%doc %attr(644,root,root) contrib/*.svg contrib/sample.hgrc
%dir %{_datadir}/zsh/
%dir %{_datadir}/zsh/site-functions/
%{_datadir}/zsh/site-functions/_mercurial
%dir %{_datadir}/emacs/site-lisp/
%{_datadir}/emacs/site-lisp/mercurial.el
%{_datadir}/emacs/site-lisp/mq.el
%{_bindir}/hg
%{_bindir}/hgk
%{_bindir}/hg-ssh
%dir %{_sysconfdir}/bash_completion.d/
%config(noreplace) %{_sysconfdir}/bash_completion.d/mercurial.sh
%dir %{_sysconfdir}/mercurial
%dir %{_sysconfdir}/mercurial/hgrc.d
%config(noreplace) %{_sysconfdir}/mercurial/hgrc.d/mergetools.rc
%if "%{?pythonver}" != "2.4"
%{_libdir}/python%{pythonver}/site-packages/%{name}-*-py%{pythonver}.egg-info
%endif
%{_libdir}/python%{pythonver}/site-packages/%{name}
%{_libdir}/python%{pythonver}/site-packages/hgext