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 $NR_EVENTS"}
  17
  18 CMD_NOTRACING="$TIME '$PROG_NOTRACING >/dev/null 2>&1'"
  19 CMD_TRACING="$TIME '$PROG_TRACING >/dev/null 2>&1'"
  20
  21 time_notrace=0
  22 for i in $(seq $ITERS); do
  23         echo 3 >/proc/sys/vm/drop_caches
  24         time_notrace="$time_notrace+$(sh -c "$CMD_NOTRACING")"
  25 done
  26
  27 lttng-sessiond -d --no-kernel
  28 lttng -q create
  29 lttng -q enable-event -u -a
  30 lttng -q start
  31
  32 time_trace=0
  33 for i in $(seq $ITERS); do
  34         echo 3 >/proc/sys/vm/drop_caches
  35         time_trace="$time_trace+$(sh -c "$CMD_TRACING")"
  36 done
  37
  38 lttng -q stop
  39 lttng -q destroy
  40
  41 pass "Trace benchmark"
  42 diag "Average tracing overhead per event is $(echo "scale=6;( ($time_trace) - ($time_notrace) ) / $ITERS / $NR_EVENTS" | bc -l)s"