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 | ||
035d7688 | 11 | : ${ITERS:=10} |
a44af49d ZT |
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 | ||
a44af49d | 30 | for i in $(seq $ITERS); do |
035d7688 | 31 | time_notrace[i]=$(sh -c "$CMD_NOTRACING") |
a44af49d ZT |
32 | done |
33 | ||
3b2e1857 | 34 | |
a44af49d | 35 | lttng-sessiond -d --no-kernel |
3b2e1857 | 36 | lttng -q create --snapshot |
a44af49d ZT |
37 | lttng -q enable-event -u -a |
38 | lttng -q start | |
39 | ||
a44af49d | 40 | for i in $(seq $ITERS); do |
035d7688 | 41 | time_trace[i]=$(sh -c "$CMD_TRACING") |
a44af49d ZT |
42 | done |
43 | ||
44 | lttng -q stop | |
45 | lttng -q destroy | |
3b2e1857 | 46 | killall lttng-sessiond |
a44af49d ZT |
47 | |
48 | pass "Trace benchmark" | |
035d7688 MD |
49 | |
50 | avg_delta=0 | |
51 | for i in $(seq $ITERS); do | |
52 | delta[$i]=$(echo "( ((${time_trace[$i]}) - (${time_notrace[$i]})) / $NR_EVENTS)" | bc -l) | |
53 | avg_delta=$(echo "(${avg_delta} + ${delta[$i]})" | bc -l) | |
54 | done | |
55 | avg_delta=$(echo "(${avg_delta} / $ITERS)" | bc -l) | |
56 | ||
57 | std_dev=0 | |
58 | for i in $(seq $ITERS); do | |
59 | dev[$i]=$(echo "(( (${delta[$i]}) - (${avg_delta}) ) ^ 2)" | bc -l) | |
60 | std_dev=$(echo "( (${std_dev}) + (${dev[i]}) )" | bc -l) | |
61 | done | |
62 | std_dev=$(echo "( (${std_dev}) / $ITERS )" | bc -l) | |
63 | std_dev=$(echo "(sqrt(${std_dev}))" | bc -l) | |
64 | ||
65 | NS_PER_EVENT=$(echo "($avg_delta * 1000000000)" | bc -l) | |
3b2e1857 MD |
66 | # Remove fractions |
67 | NS_PER_EVENT=${NS_PER_EVENT%%.*} | |
68 | ||
035d7688 MD |
69 | STD_DEV_NS_PER_EVENT=$(echo "($std_dev * 1000000000)" | bc -l) |
70 | STD_DEV_NS_PER_EVENT=${STD_DEV_NS_PER_EVENT%%.*} | |
71 | ||
72 | diag "Average tracing overhead per event is ${NS_PER_EVENT}ns, std.dev.: ${STD_DEV_NS_PER_EVENT}ns" |