| 1 | #!/bin/bash |
| 2 | |
| 3 | CURDIR=$(dirname $0)/ |
| 4 | TESTDIR=$CURDIR/.. |
| 5 | source $TESTDIR/utils/tap.sh |
| 6 | |
| 7 | plan_tests 1 |
| 8 | |
| 9 | : ${ITERS:=20} |
| 10 | : ${NR_EVENTS:=7000000} |
| 11 | : ${NR_CPUS:=1} |
| 12 | |
| 13 | : ${TIME:="./$CURDIR/ptime"} |
| 14 | |
| 15 | : ${PROG_NOTRACING:="./$CURDIR/bench1 $NR_CPUS $NR_EVENTS"} |
| 16 | : ${PROG_TRACING:="./$CURDIR/bench2 $NR_CPUS $NR_EVENTS"} |
| 17 | |
| 18 | function signal_cleanup () |
| 19 | { |
| 20 | killall lttng-sessiond |
| 21 | } |
| 22 | |
| 23 | trap signal_cleanup SIGTERM SIGINT |
| 24 | |
| 25 | CMD_NOTRACING="$TIME '$PROG_NOTRACING >/dev/null 2>&1'" |
| 26 | CMD_TRACING="$TIME '$PROG_TRACING >/dev/null 2>&1'" |
| 27 | |
| 28 | time_notrace=0 |
| 29 | for i in $(seq $ITERS); do |
| 30 | if [[ $EUID -eq 0 ]]; then |
| 31 | echo 3 >/proc/sys/vm/drop_caches |
| 32 | fi |
| 33 | time_notrace="$time_notrace+$(sh -c "$CMD_NOTRACING")" |
| 34 | done |
| 35 | |
| 36 | |
| 37 | lttng-sessiond -d --no-kernel |
| 38 | lttng -q create --snapshot |
| 39 | lttng -q enable-event -u -a |
| 40 | lttng -q start |
| 41 | |
| 42 | time_trace=0 |
| 43 | for i in $(seq $ITERS); do |
| 44 | if [[ $EUID -eq 0 ]]; then |
| 45 | echo 3 >/proc/sys/vm/drop_caches |
| 46 | fi |
| 47 | time_trace="$time_trace+$(sh -c "$CMD_TRACING")" |
| 48 | done |
| 49 | |
| 50 | lttng -q stop |
| 51 | lttng -q destroy |
| 52 | killall lttng-sessiond |
| 53 | |
| 54 | pass "Trace benchmark" |
| 55 | S_PER_EVENT=$(echo "( ($time_trace) - ($time_notrace) ) / $ITERS / $NR_EVENTS" | bc -l) |
| 56 | NS_PER_EVENT=$(echo "$S_PER_EVENT * 1000000000" | bc -l) |
| 57 | # Remove fractions |
| 58 | NS_PER_EVENT=${NS_PER_EVENT%%.*} |
| 59 | |
| 60 | diag "Average tracing overhead per event is ${NS_PER_EVENT}ns" |