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:=10}
  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 for i in $(seq $ITERS); do
  29         time_notrace[i]=$(sh -c "$CMD_NOTRACING")
  30 done
  31
  32
  33 lttng-sessiond -d --no-kernel
  34 lttng -q create --snapshot
  35 lttng -q enable-event -u -a
  36 lttng -q start
  37
  38 for i in $(seq $ITERS); do
  39         time_trace[i]=$(sh -c "$CMD_TRACING")
  40 done
  41
  42 lttng -q stop
  43 lttng -q destroy
  44 killall lttng-sessiond
  45
  46 pass "Trace benchmark"
  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 "($avg_delta * 1000000000)" | bc -l)
  64 # Remove fractions
  65 NS_PER_EVENT=${NS_PER_EVENT%%.*}
  66
  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"