Mercurial > hg > mercurial-crew-with-dirclash
view contrib/buildrpm @ 2577:fa76c5d609c9
bdiff: improve worst case behavior by 100x.
on 5.8MB (244.000 lines) text file with similar lines, hash before
this change made diff against empty file take 75 seconds. this change
improves performance to 0.6 seconds. result is that clone of smallish
repo (137MB) with some files like this takes 1 minute instead of 10
minutes.
common case of diff is 10% slower now, probably because of worse cache
locality. but diff does not affect overall performance in common case
(less than 1% of runtime is in diff when it is working ok), so this
tradeoff looks good.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
---|---|
date | Fri, 07 Jul 2006 15:02:55 -0700 |
parents | ced5f5ceb172 |
children | e5e6dd8ba6bb |
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#!/bin/sh # # Build a Mercurial RPM in place. # # Bryan O'Sullivan <bos@serpentine.com> root="`hg root 2>/dev/null`" specfile=contrib/mercurial.spec if [ -z "$root" ]; then echo 'You are not inside a Mercurial repository!' 1>&2 exit 1 fi rpmdir=/tmp/"`basename $root | sed 's/ /_/'`"-rpm cd "$root" rm -rf $rpmdir mkdir -p $rpmdir/RPMS hg clone "$root" $rpmdir/BUILD if [ ! -f $specfile ]; then echo "Cannot find $specfile!" 1>&2 exit 1 fi tmpspec=/tmp/`basename "$specfile"`.$$ # Use the most recent tag as the version. version=`hg tags | perl -e 'while(<STDIN>){if(/^(\d\S+)/){print$1;exit}}'` # Compute the release number as the difference in revision numbers # between the tip and the most recent tag. release=`hg tags | perl -e 'while(<STDIN>){/^(\S+)\s+(\d+)/;if($1eq"tip"){$t=$2}else{print$t-$2+1;exit}}'` tip=`hg -q tip` # Beat up the spec file sed -e 's,^Source:.*,Source: /dev/null,' \ -e "s,^Version:.*,Version: $version," \ -e "s,^Release:.*,Release: $release," \ -e "s,^%prep.*,Changeset: $tip\n\0," \ -e 's,^%setup.*,,' \ $specfile > $tmpspec rpmbuild --define "_topdir $rpmdir" -bb $tmpspec if [ $? = 0 ]; then rm -rf $tmpspec $rpmdir/BUILD mv $rpmdir/RPMS/*/* $rpmdir && rm -r $rpmdir/RPMS echo echo "Packages are in $rpmdir" fi