Commit | Line | Data |
---|---|---|
a44af49d ZT |
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 $NR_EVENTS"} | |
17 | ||
57aff1c0 MD |
18 | function signal_cleanup () |
19 | { | |
20 | killall lttng-sessiond | |
21 | } | |
22 | ||
23 | trap signal_cleanup SIGTERM SIGINT | |
24 | ||
a44af49d ZT |
25 | CMD_NOTRACING="$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 | |
57aff1c0 MD |
30 | if [[ $EUID -eq 0 ]]; then |
31 | echo 3 >/proc/sys/vm/drop_caches | |
32 | fi | |
a44af49d ZT |
33 | time_notrace="$time_notrace+$(sh -c "$CMD_NOTRACING")" |
34 | done | |
35 | ||
57aff1c0 | 36 | |
a44af49d | 37 | lttng-sessiond -d --no-kernel |
57aff1c0 | 38 | lttng -q create --snapshot |
a44af49d ZT |
39 | lttng -q enable-event -u -a |
40 | lttng -q start | |
41 | ||
42 | time_trace=0 | |
43 | for i in $(seq $ITERS); do | |
57aff1c0 MD |
44 | if [[ $EUID -eq 0 ]]; then |
45 | echo 3 >/proc/sys/vm/drop_caches | |
46 | fi | |
a44af49d ZT |
47 | time_trace="$time_trace+$(sh -c "$CMD_TRACING")" |
48 | done | |
49 | ||
50 | lttng -q stop | |
51 | lttng -q destroy | |
57aff1c0 | 52 | killall lttng-sessiond |
a44af49d ZT |
53 | |
54 | pass "Trace benchmark" | |
57aff1c0 MD |
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" |