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} |
b670e9e8 MD |
12 | : ${DURATION:=2} |
13 | : ${NR_THREADS:=1} | |
14 | : ${NR_CPUS:=$(lscpu | grep "^CPU(s)" | sed 's/^.*:[ \t]*//g')} | |
a44af49d ZT |
15 | |
16 | : ${TIME:="./$CURDIR/ptime"} | |
17 | ||
b670e9e8 MD |
18 | : ${PROG_NOTRACING:="./$CURDIR/bench1 $NR_THREADS $DURATION"} |
19 | : ${PROG_TRACING:="./$CURDIR/bench2 $NR_THREADS $DURATION"} | |
a44af49d | 20 | |
3b2e1857 MD |
21 | function signal_cleanup () |
22 | { | |
23 | killall lttng-sessiond | |
b670e9e8 | 24 | exit |
3b2e1857 MD |
25 | } |
26 | ||
27 | trap signal_cleanup SIGTERM SIGINT | |
28 | ||
b670e9e8 MD |
29 | CMD_NOTRACING="$TIME '$PROG_NOTRACING'" |
30 | CMD_TRACING="$TIME '$PROG_TRACING'" | |
31 | ||
32 | NR_ACTIVE_CPUS=$(( $NR_CPUS > $NR_THREADS ? $NR_THREADS : $NR_CPUS )) | |
a44af49d | 33 | |
a44af49d | 34 | for i in $(seq $ITERS); do |
b670e9e8 MD |
35 | res=$(sh -c "$CMD_NOTRACING") |
36 | loops_notrace[$i]=$(echo "${res}" | grep "^Number of loops:" | sed 's/^.*: //g') | |
37 | time_notrace[$i]=$(echo "${res}" | grep "^Wall time:" | sed 's/^.*: //g') | |
a44af49d ZT |
38 | done |
39 | ||
40 | lttng-sessiond -d --no-kernel | |
3b2e1857 | 41 | lttng -q create --snapshot |
a44af49d ZT |
42 | lttng -q enable-event -u -a |
43 | lttng -q start | |
44 | ||
a44af49d | 45 | for i in $(seq $ITERS); do |
b670e9e8 MD |
46 | res=$(sh -c "$CMD_TRACING") |
47 | loops_trace[$i]=$(echo "${res}" | grep "^Number of loops:" | sed 's/^.*: //g') | |
48 | time_trace[$i]=$(echo "${res}" | grep "^Wall time:" | sed 's/^.*: //g') | |
a44af49d ZT |
49 | done |
50 | ||
51 | lttng -q stop | |
52 | lttng -q destroy | |
3b2e1857 | 53 | killall lttng-sessiond |
a44af49d ZT |
54 | |
55 | pass "Trace benchmark" | |
035d7688 | 56 | |
b670e9e8 MD |
57 | # Multiply the wall time by the number of active CPUs to get the |
58 | # overhead of events on each active cpu. | |
59 | ||
035d7688 MD |
60 | avg_delta=0 |
61 | for i in $(seq $ITERS); do | |
b670e9e8 | 62 | delta[$i]=$(echo "((${time_trace[$i]} * ${NR_ACTIVE_CPUS} / ${loops_trace[$i]}) - (${time_notrace[$i]} * ${NR_ACTIVE_CPUS} / ${loops_notrace[$i]}))" | bc -l) |
035d7688 MD |
63 | avg_delta=$(echo "(${avg_delta} + ${delta[$i]})" | bc -l) |
64 | done | |
65 | avg_delta=$(echo "(${avg_delta} / $ITERS)" | bc -l) | |
66 | ||
67 | std_dev=0 | |
68 | for i in $(seq $ITERS); do | |
69 | dev[$i]=$(echo "(( (${delta[$i]}) - (${avg_delta}) ) ^ 2)" | bc -l) | |
70 | std_dev=$(echo "( (${std_dev}) + (${dev[i]}) )" | bc -l) | |
71 | done | |
72 | std_dev=$(echo "( (${std_dev}) / $ITERS )" | bc -l) | |
73 | std_dev=$(echo "(sqrt(${std_dev}))" | bc -l) | |
74 | ||
75 | NS_PER_EVENT=$(echo "($avg_delta * 1000000000)" | bc -l) | |
3b2e1857 MD |
76 | # Remove fractions |
77 | NS_PER_EVENT=${NS_PER_EVENT%%.*} | |
78 | ||
035d7688 | 79 | STD_DEV_NS_PER_EVENT=$(echo "($std_dev * 1000000000)" | bc -l) |
b670e9e8 | 80 | # Remove fractions |
035d7688 MD |
81 | STD_DEV_NS_PER_EVENT=${STD_DEV_NS_PER_EVENT%%.*} |
82 | ||
b670e9e8 | 83 | diag "Average tracing overhead per event is ${NS_PER_EVENT}ns, std.dev.: ${STD_DEV_NS_PER_EVENT}ns { NR_THREADS=${NR_THREADS}, NR_ACTIVE_CPUS=${NR_ACTIVE_CPUS} }" |