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# Measure probe performance. Currently measures:
# static user uprobes, static user kprobes, dynamic user uprobes.
# example use:
# ./bench.sh -stapdir /foo/stap/install/ -gccdir /foo/gcc-4.4.3-10/install/
function stap_test() {
# Compile bench
$STAP/bin/dtrace -G -s bench_.d -D$1
$STAP/bin/dtrace --types -h -s bench_.d -D$1
$GCC/bin/gcc -D$1 -DLOOP=10 bench_.o bench.c -o bench-$2$3.x -I$TESTSRC -I. -isystem $STAP/include -g
if [ $? -ne 0 ]; then echo "error compiling bench-$2$3"; return; fi
./bench-$2$3.x > /dev/null
# Run bench with stap
taskset 1 $STAP/bin/stap -DSTP_NO_OVERLOAD=1 -g -p4 -m stapbench_$2$3 bench.stp ./bench-$2$3.x $1 >/dev/null
if [ $? -ne 0 ]; then echo "error running stapbench_$2$3 with stap"; return; fi
# Parse /usr/bin/time, bench.x, bench.stp output to get statistics
(
taskset 1 /usr/bin/time ./bench-$2$3.x 2>&1 >/dev/null # mute stdout, get times from stderr
$STAP/bin/staprun stapbench_$2$3.ko -c "taskset 1 /usr/bin/time ./bench-$2$3.x" 2>&1
) | awk --non-decimal-data '
function seconds(s) {
if (index(s,":"))
m=substr(s,0,index(s,":"))*60
else m=0
return m + substr(s,index(s,":")+1)
}
# probe count and average probe setup cycles from bench.stp
/@count/ {
n += 1
count += (substr($2,8));
avg += (substr($6,6))
}
# elapsed time from /usr/bin/time
/elapsed/ {
elapsed=(seconds($3))
if (nostapet == 0) {
nostapet=elapsed
print "without stap elapsed time is " elapsed
}
else
print "with stap elapsed time is " elapsed
}
# average probe cycles from bench.x
/_cycles/ {
cycles_n += 1
cycles += $2
}
END {
print "count of probe hits is " count
if (cycles && n) {
printf "average cycles/probe is %d\n", (cycles / cycles_n)
printf "average setup cycles/probe is %d\n", (avg / n)
}
if (count)
printf "seconds/probe (%s/%s) is %.9f\n",
elapsed-nostapet, count, (elapsed-nostapet)/count
}'
}
usage () {
echo 'Usage $0 -testsrcdir /testsuite/src/top/dir [-k] [-stapdir /stap/top/dir] [-gccdir /gcc/top/dir] [-help]'
exit
}
# Main
while test ! -z "$1" ; do
if [ "$1" = "-gccdir" ] ; then GCC=$2 ; shift
elif [ "$1" = "-stapdir" ] ; then STAP=$2 ; shift
elif [ "$1" = "-testsrcdir" ] ; then TESTSRC=$2 ; shift
elif [ "$1" = "-k" ] ; then KEEP=1 ;
elif [ "$1" = "-h" -o "$1" = "-help" -o "$1" = "?" ] ; then
usage
else echo Unrecognized arg "$1"
exit
fi
shift
done
if [ ! -z "$GCC" ] ; then
if [ ! -x "$GCC/bin/gcc" ] ; then
echo $GCC/bin/gcc does not exist
exit
fi
else
GCC=/usr/
fi
echo Using $GCC/bin/gcc
if [ ! -z "$STAP" ] ; then
if [ ! -x "$STAP/bin/stap" ] ; then
echo $STAP/bin/stap does not exist
exit
fi
else
STAP=/usr/
fi
echo Using $STAP/bin/stap
if [ ! -z "$TESTSRC" ] ; then
if [ ! -r "$TESTSRC/sys/sdt.h" ] ; then
echo $TESTSRC/sys/sdt.h does not exist
exit
fi
else
echo -e 'The testsuite sources containing directory must be given\nso the compatible sdt.h can be found'
usage
fi
echo Using $TESTSRC/sys/sdt.h
echo -e "\n##### LABEL (NO SDT) #####\n"
stap_test NO_STAP_SDT nosdt
echo -e "\n##### UPROBE V1 #####\n"
stap_test STAP_SDT_V1 uprobe
echo -e "\n##### UPROBE V2 #####\n"
stap_test STAP_SDT_V2 uprobe2
echo -e "\n##### UPROBE V3 #####\n"
stap_test STAP_SDT_V3 uprobe3
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