Ken Moffat wrote:
> On Mon, Oct 18, 2010 at 10:19:58PM +0100, Ken Moffat wrote:
>> I've never imagined that build times were exactly repeatable, but
>> I'd assumed that, *on an unloaded system with only a browser
>> running* the times would be fairly close, say plus or minus 3%.
>> Now, I start to wonder.
>>
> I forgot to add that the original builds were probably into swap
> (abiword is almost at the end of my build, and if I look, I usually
> see the box is using swap during a build), but no swap was used
> after the most recent [slow] build.
>
> Also, I'm deleting the source directory between builds.
I haven't looked at it in detail, but I think files in memory are kept
around for a while until it's needed for something else. About the only
way to really get repeatability is to reboot between tries and that
isn't realistic.
In any case, I use a script like the following one for each program.
Installing the package on /tmp allows for repeatability in size, if not
SBU time.
-- Bruce
#!/bin/bash
source /usr/src/stats
#######################
# Installing openssh
DIR=`pwd`
PROGRAM=openssh-4.5p1
LOG=$DIR/$PROGRAM.log
TITLE=$PROGRAM
TIMEFORMAT="$TIMEFMT $TITLE"
BUILDDIR=/tmp/openssh
DEST=$BUILDDIR/install
rm -rf $BUILDDIR
mkdir $BUILDDIR
cd $BUILDDIR
before=`df -k / | grep / | sed -e "s/ \{2,\}/ /g" | cut -d' ' -f3`
tar -xf $DIR/$PROGRAM.tar.?z* || exit 1
cd $PROGRAM
{ time \
{
echo Making $TITLE
date
sed -i "s:-lcrypto:/usr/lib/libcrypto.a:g" configure
./configure --prefix=/usr \
--sysconfdir=/etc/ssh \
--libexecdir=/usr/lib/openssh \
--with-md5-passwords \
--with-privsep-path=/var/lib/sshd &&
make &&
make DESTDIR=$DEST install &&
install -v -m755 -d $DEST/usr/share/doc/$PROGRAM &&
install -v -m644 INSTALL LICENCE OVERVIEW README* WARNING.RNG \
$DEST/usr/share/doc/$PROGRAM
}
} 2>&1 | tee -a $LOG
if [ $PIPESTATUS -ne 0 ]; then exit 1; fi;
stats $LOG $DIR/$PROGRAM.tar.?z* $before
exit 0
-----------------------
$ cat stats
#!/bin/bash
function stats()
{
log=$1
tarball=$2
b4=$3
free_now=`df -k / | grep / | sed -e "s/ \{2,\}/ /g" | cut -d" " -f3`
buildtime=`tail -n1 $log|cut -f1 -d" "`
sbu=`echo "scale=3; $buildtime / 132.5" | bc`
psizeK=`du -k $tarball | cut -f1`
psizeM=`echo "scale=3; $psizeK / 1024" | bc`
bsizeK=`echo "$free_now - $b4" | bc`
bsizeM=`echo "scale=3; $bsizeK / 1024" | bc`
echo "SBU=$sbu" | tee -a $log
echo "$psizeK $tarball size ($psizeM MB)" | tee -a $log
echo "$bsizeK kilobytes build size ($bsizeM MB)" | tee -a $log
(echo -n "md5sum : "; md5sum $tarball) | tee -a $log
(echo -n "sha1sum: "; sha1sum $tarball) | tee -a $log
echo "`date` $tarball" >> /usr/src/packages.log
}
TIMEFMT='%1R Elapsed Time - '
------------------
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