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} |
df62bd71 MD |
10 | : ${DURATION:=2} |
11 | : ${NR_THREADS:=1} | |
12 | : ${NR_CPUS:=$(lscpu | grep "^CPU(s)" | sed 's/^.*:[ \t]*//g')} | |
a44af49d ZT |
13 | |
14 | : ${TIME:="./$CURDIR/ptime"} | |
15 | ||
df62bd71 MD |
16 | : ${PROG_NOTRACING:="./$CURDIR/bench1 $NR_THREADS $DURATION"} |
17 | : ${PROG_TRACING:="./$CURDIR/bench2 $NR_THREADS $DURATION"} | |
a44af49d | 18 | |
57aff1c0 MD |
19 | function signal_cleanup () |
20 | { | |
21 | killall lttng-sessiond | |
df62bd71 | 22 | exit |
57aff1c0 MD |
23 | } |
24 | ||
25 | trap signal_cleanup SIGTERM SIGINT | |
26 | ||
df62bd71 MD |
27 | CMD_NOTRACING="$TIME '$PROG_NOTRACING'" |
28 | CMD_TRACING="$TIME '$PROG_TRACING'" | |
29 | ||
30 | NR_ACTIVE_CPUS=$(( $NR_CPUS > $NR_THREADS ? $NR_THREADS : $NR_CPUS )) | |
a44af49d | 31 | |
a44af49d | 32 | for i in $(seq $ITERS); do |
df62bd71 MD |
33 | res=$(sh -c "$CMD_NOTRACING") |
34 | loops_notrace[$i]=$(echo "${res}" | grep "^Number of loops:" | sed 's/^.*: //g') | |
35 | time_notrace[$i]=$(echo "${res}" | grep "^Wall time:" | sed 's/^.*: //g') | |
a44af49d ZT |
36 | done |
37 | ||
38 | lttng-sessiond -d --no-kernel | |
57aff1c0 | 39 | lttng -q create --snapshot |
a44af49d ZT |
40 | lttng -q enable-event -u -a |
41 | lttng -q start | |
42 | ||
a44af49d | 43 | for i in $(seq $ITERS); do |
df62bd71 MD |
44 | res=$(sh -c "$CMD_TRACING") |
45 | loops_trace[$i]=$(echo "${res}" | grep "^Number of loops:" | sed 's/^.*: //g') | |
46 | time_trace[$i]=$(echo "${res}" | grep "^Wall time:" | sed 's/^.*: //g') | |
a44af49d ZT |
47 | done |
48 | ||
49 | lttng -q stop | |
50 | lttng -q destroy | |
57aff1c0 | 51 | killall lttng-sessiond |
a44af49d ZT |
52 | |
53 | pass "Trace benchmark" | |
e2a245bb | 54 | |
df62bd71 MD |
55 | # Multiply the wall time by the number of active CPUs to get the |
56 | # overhead of events on each active cpu. | |
57 | ||
e2a245bb MD |
58 | avg_delta=0 |
59 | for i in $(seq $ITERS); do | |
df62bd71 | 60 | delta[$i]=$(echo "((${time_trace[$i]} * ${NR_ACTIVE_CPUS} / ${loops_trace[$i]}) - (${time_notrace[$i]} * ${NR_ACTIVE_CPUS} / ${loops_notrace[$i]}))" | bc -l) |
e2a245bb MD |
61 | avg_delta=$(echo "(${avg_delta} + ${delta[$i]})" | bc -l) |
62 | done | |
63 | avg_delta=$(echo "(${avg_delta} / $ITERS)" | bc -l) | |
64 | ||
65 | std_dev=0 | |
66 | for i in $(seq $ITERS); do | |
67 | dev[$i]=$(echo "(( (${delta[$i]}) - (${avg_delta}) ) ^ 2)" | bc -l) | |
68 | std_dev=$(echo "( (${std_dev}) + (${dev[i]}) )" | bc -l) | |
69 | done | |
70 | std_dev=$(echo "( (${std_dev}) / $ITERS )" | bc -l) | |
71 | std_dev=$(echo "(sqrt(${std_dev}))" | bc -l) | |
72 | ||
73 | NS_PER_EVENT=$(echo "($avg_delta * 1000000000)" | bc -l) | |
57aff1c0 MD |
74 | # Remove fractions |
75 | NS_PER_EVENT=${NS_PER_EVENT%%.*} | |
76 | ||
e2a245bb | 77 | STD_DEV_NS_PER_EVENT=$(echo "($std_dev * 1000000000)" | bc -l) |
df62bd71 | 78 | # Remove fractions |
e2a245bb MD |
79 | STD_DEV_NS_PER_EVENT=${STD_DEV_NS_PER_EVENT%%.*} |
80 | ||
df62bd71 | 81 | 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} }" |