tests/benchmark/test_benchmark

   1 #!/bin/bash
   2
   3 CURDIR=$(dirname $0)/
   4 TESTDIR=$CURDIR/..
   5 source $TESTDIR/utils/tap.sh
   6
   7 plan_tests 1
   8
   9 : ${ITERS:=20}
  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 $NR_EVENTS"}
  17
  18 function signal_cleanup ()
  19 {
  20         killall lttng-sessiond
  21 }
  22
  23 trap signal_cleanup SIGTERM SIGINT
  24
  25 CMD_NOTRACING="$TIME '$PROG_NOTRACING >/dev/null 2>&1'"
  26 CMD_TRACING="$TIME '$PROG_TRACING >/dev/null 2>&1'"
  27
  28 time_notrace=0
  29 for i in $(seq $ITERS); do
  30         if [[ $EUID -eq 0 ]]; then
  31                 echo 3 >/proc/sys/vm/drop_caches
  32         fi
  33         time_notrace="$time_notrace+$(sh -c "$CMD_NOTRACING")"
  34 done
  35
  36
  37 lttng-sessiond -d --no-kernel
  38 lttng -q create --snapshot
  39 lttng -q enable-event -u -a
  40 lttng -q start
  41
  42 time_trace=0
  43 for i in $(seq $ITERS); do
  44         if [[ $EUID -eq 0 ]]; then
  45                 echo 3 >/proc/sys/vm/drop_caches
  46         fi
  47         time_trace="$time_trace+$(sh -c "$CMD_TRACING")"
  48 done
  49
  50 lttng -q stop
  51 lttng -q destroy
  52 killall lttng-sessiond
  53
  54 pass "Trace benchmark"
  55 S_PER_EVENT=$(echo "( ($time_trace) - ($time_notrace) ) / $ITERS / $NR_EVENTS" | bc -l)
  56 NS_PER_EVENT=$(echo "$S_PER_EVENT * 1000000000" | bc -l)
  57 # Remove fractions
  58 NS_PER_EVENT=${NS_PER_EVENT%%.*}
  59
  60 diag "Average tracing overhead per event is ${NS_PER_EVENT}ns"