Commit | Line | Data |
---|---|---|
a44af49d | 1 | #!/bin/bash |
c0c0989a MJ |
2 | # |
3 | # SPDX-License-Identifier: LGPL-2.1-only | |
a44af49d ZT |
4 | |
5 | CURDIR=$(dirname $0)/ | |
6 | TESTDIR=$CURDIR/.. | |
7 | source $TESTDIR/utils/tap.sh | |
8 | ||
9 | plan_tests 1 | |
10 | ||
11 | : ${ITERS:=20} | |
12 | : ${NR_EVENTS:=7000000} | |
13 | : ${NR_CPUS:=1} | |
14 | ||
15 | : ${TIME:="./$CURDIR/ptime"} | |
16 | ||
17 | : ${PROG_NOTRACING:="./$CURDIR/bench1 $NR_CPUS $NR_EVENTS"} | |
18 | : ${PROG_TRACING:="./$CURDIR/bench2 $NR_CPUS $NR_EVENTS"} | |
19 | ||
3b2e1857 MD |
20 | function signal_cleanup () |
21 | { | |
22 | killall lttng-sessiond | |
23 | } | |
24 | ||
25 | trap signal_cleanup SIGTERM SIGINT | |
26 | ||
a44af49d ZT |
27 | CMD_NOTRACING="$TIME '$PROG_NOTRACING >/dev/null 2>&1'" |
28 | CMD_TRACING="$TIME '$PROG_TRACING >/dev/null 2>&1'" | |
29 | ||
30 | time_notrace=0 | |
31 | for i in $(seq $ITERS); do | |
3b2e1857 MD |
32 | if [[ $EUID -eq 0 ]]; then |
33 | echo 3 >/proc/sys/vm/drop_caches | |
34 | fi | |
a44af49d ZT |
35 | time_notrace="$time_notrace+$(sh -c "$CMD_NOTRACING")" |
36 | done | |
37 | ||
3b2e1857 | 38 | |
a44af49d | 39 | lttng-sessiond -d --no-kernel |
3b2e1857 | 40 | lttng -q create --snapshot |
a44af49d ZT |
41 | lttng -q enable-event -u -a |
42 | lttng -q start | |
43 | ||
44 | time_trace=0 | |
45 | for i in $(seq $ITERS); do | |
3b2e1857 MD |
46 | if [[ $EUID -eq 0 ]]; then |
47 | echo 3 >/proc/sys/vm/drop_caches | |
48 | fi | |
a44af49d ZT |
49 | time_trace="$time_trace+$(sh -c "$CMD_TRACING")" |
50 | done | |
51 | ||
52 | lttng -q stop | |
53 | lttng -q destroy | |
3b2e1857 | 54 | killall lttng-sessiond |
a44af49d ZT |
55 | |
56 | pass "Trace benchmark" | |
3b2e1857 MD |
57 | S_PER_EVENT=$(echo "( ($time_trace) - ($time_notrace) ) / $ITERS / $NR_EVENTS" | bc -l) |
58 | NS_PER_EVENT=$(echo "$S_PER_EVENT * 1000000000" | bc -l) | |
59 | # Remove fractions | |
60 | NS_PER_EVENT=${NS_PER_EVENT%%.*} | |
61 | ||
62 | diag "Average tracing overhead per event is ${NS_PER_EVENT}ns" |