tests: improve benchmark script

[deliverable/lttng-ust.git] / tests / benchmark / test_benchmark

diff --git a/tests/benchmark/test_benchmark b/tests/benchmark/test_benchmark
index c55e3027b261869bcfc3be4bef06dcfd70aedd73..9cffcbc3e6e38cf0569eda77692d8e8428984471 100755 (executable)
--- a/tests/benchmark/test_benchmark
+++ b/tests/benchmark/test_benchmark
@@ -15,28 +15,46 @@ plan_tests 1
 : ${PROG_NOTRACING:="./$CURDIR/bench1 $NR_CPUS $NR_EVENTS"}
 : ${PROG_TRACING:="./$CURDIR/bench2 $NR_CPUS $NR_EVENTS"}
 
+function signal_cleanup ()
+{
+       killall lttng-sessiond
+}
+
+trap signal_cleanup SIGTERM SIGINT
+
 CMD_NOTRACING="$TIME '$PROG_NOTRACING >/dev/null 2>&1'"
 CMD_TRACING="$TIME '$PROG_TRACING >/dev/null 2>&1'"
 
 time_notrace=0
 for i in $(seq $ITERS); do
-       echo 3 >/proc/sys/vm/drop_caches
+       if [[ $EUID -eq 0 ]]; then
+               echo 3 >/proc/sys/vm/drop_caches
+       fi
        time_notrace="$time_notrace+$(sh -c "$CMD_NOTRACING")"
 done
 
+
 lttng-sessiond -d --no-kernel
-lttng -q create
+lttng -q create --snapshot
 lttng -q enable-event -u -a
 lttng -q start
 
 time_trace=0
 for i in $(seq $ITERS); do
-       echo 3 >/proc/sys/vm/drop_caches
+       if [[ $EUID -eq 0 ]]; then
+               echo 3 >/proc/sys/vm/drop_caches
+       fi
        time_trace="$time_trace+$(sh -c "$CMD_TRACING")"
 done
 
 lttng -q stop
 lttng -q destroy
+killall lttng-sessiond
 
 pass "Trace benchmark"
-diag "Average tracing overhead per event is $(echo "scale=6;( ($time_trace) - ($time_notrace) ) / $ITERS / $NR_EVENTS" | bc -l)s"
+S_PER_EVENT=$(echo "( ($time_trace) - ($time_notrace) ) / $ITERS / $NR_EVENTS" | bc -l)
+NS_PER_EVENT=$(echo "$S_PER_EVENT * 1000000000" | bc -l)
+# Remove fractions
+NS_PER_EVENT=${NS_PER_EVENT%%.*}
+
+diag "Average tracing overhead per event is ${NS_PER_EVENT}ns"