tests/benchmark/test_benchmark

   1 #!/bin/bash
   2 #
   3 # SPDX-License-Identifier: LGPL-2.1-only
   4
   5 CURDIR=$(dirname $0)/
   6 TESTDIR=$CURDIR/..
   7 source $TESTDIR/utils/tap.sh
   8
   9 plan_tests 1
  10
  11 : ${ITERS:=20}
  12 : ${NR_EVENTS:=7000000}
  13 : ${NR_CPUS:=1}
  14
  15 : ${TIME:="./$CURDIR/ptime"}
  16
  17 : ${PROG_NOTRACING:="./$CURDIR/bench1 $NR_CPUS $NR_EVENTS"}
  18 : ${PROG_TRACING:="./$CURDIR/bench2 $NR_CPUS $NR_EVENTS"}
  19
  20 CMD_NOTRACING="$TIME '$PROG_NOTRACING >/dev/null 2>&1'"
  21 CMD_TRACING="$TIME '$PROG_TRACING >/dev/null 2>&1'"
  22
  23 time_notrace=0
  24 for i in $(seq $ITERS); do
  25         echo 3 >/proc/sys/vm/drop_caches
  26         time_notrace="$time_notrace+$(sh -c "$CMD_NOTRACING")"
  27 done
  28
  29 lttng-sessiond -d --no-kernel
  30 lttng -q create
  31 lttng -q enable-event -u -a
  32 lttng -q start
  33
  34 time_trace=0
  35 for i in $(seq $ITERS); do
  36         echo 3 >/proc/sys/vm/drop_caches
  37         time_trace="$time_trace+$(sh -c "$CMD_TRACING")"
  38 done
  39
  40 lttng -q stop
  41 lttng -q destroy
  42
  43 pass "Trace benchmark"
  44 diag "Average tracing overhead per event is $(echo "scale=6;( ($time_trace) - ($time_notrace) ) / $ITERS / $NR_EVENTS" | bc -l)s"