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 | ||
e2a245bb | 9 | : ${ITERS:=10} |
a44af49d ZT |
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 | ||
a44af49d | 28 | for i in $(seq $ITERS); do |
e2a245bb | 29 | time_notrace[i]=$(sh -c "$CMD_NOTRACING") |
a44af49d ZT |
30 | done |
31 | ||
57aff1c0 | 32 | |
a44af49d | 33 | lttng-sessiond -d --no-kernel |
57aff1c0 | 34 | lttng -q create --snapshot |
a44af49d ZT |
35 | lttng -q enable-event -u -a |
36 | lttng -q start | |
37 | ||
a44af49d | 38 | for i in $(seq $ITERS); do |
e2a245bb | 39 | time_trace[i]=$(sh -c "$CMD_TRACING") |
a44af49d ZT |
40 | done |
41 | ||
42 | lttng -q stop | |
43 | lttng -q destroy | |
57aff1c0 | 44 | killall lttng-sessiond |
a44af49d ZT |
45 | |
46 | pass "Trace benchmark" | |
e2a245bb MD |
47 | |
48 | avg_delta=0 | |
49 | for i in $(seq $ITERS); do | |
50 | delta[$i]=$(echo "( ((${time_trace[$i]}) - (${time_notrace[$i]})) / $NR_EVENTS)" | bc -l) | |
51 | avg_delta=$(echo "(${avg_delta} + ${delta[$i]})" | bc -l) | |
52 | done | |
53 | avg_delta=$(echo "(${avg_delta} / $ITERS)" | bc -l) | |
54 | ||
55 | std_dev=0 | |
56 | for i in $(seq $ITERS); do | |
57 | dev[$i]=$(echo "(( (${delta[$i]}) - (${avg_delta}) ) ^ 2)" | bc -l) | |
58 | std_dev=$(echo "( (${std_dev}) + (${dev[i]}) )" | bc -l) | |
59 | done | |
60 | std_dev=$(echo "( (${std_dev}) / $ITERS )" | bc -l) | |
61 | std_dev=$(echo "(sqrt(${std_dev}))" | bc -l) | |
62 | ||
63 | NS_PER_EVENT=$(echo "($avg_delta * 1000000000)" | bc -l) | |
57aff1c0 MD |
64 | # Remove fractions |
65 | NS_PER_EVENT=${NS_PER_EVENT%%.*} | |
66 | ||
e2a245bb MD |
67 | STD_DEV_NS_PER_EVENT=$(echo "($std_dev * 1000000000)" | bc -l) |
68 | STD_DEV_NS_PER_EVENT=${STD_DEV_NS_PER_EVENT%%.*} | |
69 | ||
70 | diag "Average tracing overhead per event is ${NS_PER_EVENT}ns, std.dev.: ${STD_DEV_NS_PER_EVENT}ns" |