tests/regression/tools/tracefile-limits/test_tracefile_count

   1 #!/bin/bash
   2 #
   3 # Copyright (C) 2013 Christian Babeux <christian.babeux@efficios.com>
   4 # Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5 #
   6 # SPDX-License-Identifier: LGPL-2.1-only
   7
   8 TEST_DESC="Tracefile count limits"
   9
  10 CURDIR=$(dirname "$0")/
  11 TESTDIR=$CURDIR/../../..
  12
  13 TESTAPP_PATH="$TESTDIR/utils/testapp"
  14 TESTAPP_NAME="gen-ust-events"
  15 TESTAPP_BIN="$TESTAPP_PATH/$TESTAPP_NAME/$TESTAPP_NAME"
  16
  17 STATS_BIN="$TESTDIR/utils/babelstats.pl"
  18 NUM_TESTS=74
  19
  20 PAGE_SIZE=$(getconf PAGE_SIZE)
  21 TRACEFILE_SIZE=$PAGE_SIZE
  22
  23 source "$TESTDIR"/utils/utils.sh
  24
  25 if [ ! -x "$TESTAPP_BIN" ]; then
  26         BAIL_OUT "No UST events binary detected."
  27 fi
  28
  29 function pick_random_cpuid ()
  30 {
  31         local cpuids
  32         read -r -a cpuids <<< "$(get_online_cpus)"
  33         echo "${cpuids[ $RANDOM % ${#cpuids[@]} ]}"
  34 }
  35
  36 function enable_lttng_channel_count_limit ()
  37 {
  38         sess_name="$1"
  39         channel_name="$2"
  40         tracefile_count_limit="$3"
  41
  42         test_name="Enable channel \`$channel_name\` "
  43         test_name+="for session \`$sess_name\`: "
  44         test_name+="$tracefile_count_limit tracefiles"
  45
  46         "$TESTDIR"/../src/bin/lttng/"$LTTNG_BIN" enable-channel \
  47             -u "$channel_name" -s "$sess_name" \
  48             --subbuf-size "$PAGE_SIZE" \
  49             --tracefile-size "$TRACEFILE_SIZE" \
  50             --tracefile-count "$tracefile_count_limit" >/dev/null 2>&1
  51
  52         ok $? "$test_name"
  53 }
  54
  55 function validate_min_max ()
  56 {
  57         stats="$1"
  58         field="$2"
  59         expected_min="$3"
  60         expected_max="$4"
  61
  62         echo $stats | grep -q -E "$field $expected_min $expected_max"
  63         return $?
  64 }
  65
  66 function get_total_stream_file_size ()
  67 {
  68         local trace_path="$1"
  69         local stream_name_pattern="$2"
  70         local size
  71
  72         size=$(find "$trace_path" -type f -regex "$stream_name_pattern" -exec du -b -c {} + | tail -n1 | cut -f 1)
  73         echo "$size"
  74 }
  75
  76 function get_stream_file_count ()
  77 {
  78         local trace_path="$1"
  79         local stream_name_pattern="$2"
  80         local count
  81
  82         count=$(find "$trace_path" -type f -regex "$stream_name_pattern" | wc -l)
  83         echo "$count"
  84 }
  85
  86 function test_tracefile_count_limit ()
  87 {
  88         local count_limit="$1"
  89
  90         local channel_name="channel"
  91         local cpuno=$(pick_random_cpuid)
  92         local event_name="tp:tptest"
  93         local expected_size=$((count_limit * TRACEFILE_SIZE))
  94         local num_iter=100000
  95         local previous_stream_size=-1
  96         local session_name
  97         local stream_pattern=".*${channel_name}_${cpuno}_[0-9]*"
  98         local stream_size=0
  99         local trace_path
 100
 101         session_name=$(randstring 16 0)
 102         trace_path=$(mktemp -d)
 103
 104         diag "Test tracefile count limit : CPU $cpuno, $count_limit tracefiles, expecting a maximum of $expected_size bytes per CPU"
 105
 106         create_lttng_session_ok "$session_name" "$trace_path"
 107
 108         enable_lttng_channel_count_limit \
 109             "$session_name" "$channel_name" "$count_limit"
 110
 111         enable_ust_lttng_event_ok \
 112             "$session_name" "$event_name" "$channel_name"
 113
 114         # Run the test app until the total stream size stops changing the
 115         # expected size is exceeded (error).
 116         #
 117         # The `$stream_size` will not stabilize until the trace file count
 118         # limit is reached. This is guaranteed by the use of start/produce/stop
 119         # cycles forcing the consumption of buffers, preventing unwanted stall
 120         # in stream size.
 121         while [ "$stream_size" -ne "$previous_stream_size" ]; do
 122                 start_lttng_tracing_notap "$session_name"
 123                 taskset -c "$cpuno" "$TESTAPP_BIN" -i "$num_iter" >/dev/null 2>&1
 124                 stop_lttng_tracing_notap "$session_name"
 125
 126                 previous_stream_size="$stream_size"
 127                 stream_size=$(get_total_stream_file_size "$trace_path" "$stream_pattern")
 128                 diag "Completed an iteration: previous size = $previous_stream_size bytes, new size = $stream_size bytes"
 129
 130                 if [ "$stream_size" -gt "$expected_size" ]; then
 131                         diag "Total size for CPU $cpuno exceeds expected size: stream size = $stream_size bytes, expected size = $expected_size"
 132                         break
 133                 fi
 134         done
 135
 136         destroy_lttng_session_ok "$session_name"
 137
 138         [ "$expected_size" -eq "$stream_size" ]
 139         ok $? "Total stream size of CPU $cpuno is $expected_size"
 140
 141         [ "$(get_stream_file_count "$trace_path" "$stream_pattern")" -eq "$count_limit" ]
 142         ok $? "Stream meets the trace file limit of $count_limit"
 143
 144         stats=`babeltrace $trace_path | $STATS_BIN --tracepoint $event_name`
 145
 146         validate_min_max "$stats" "intfield" "[0-9]+" "$expected_max"
 147         ok $? "Trace validation - intfield"
 148
 149         validate_min_max "$stats" "netintfield" "[0-9]+" "$expected_max"
 150         ok $? "Trace validation - netintfield"
 151
 152         validate_min_max "$stats" "longfield" "[0-9]+" "$expected_max"
 153         ok $? "Trace validation - longfield"
 154
 155         rm -rf "$trace_path"
 156 }
 157
 158 LIMITS=("1" "2" "4" "8" "10" "16" "32" "64")
 159
 160 plan_tests $NUM_TESTS
 161
 162 print_test_banner "$TEST_DESC"
 163
 164 start_lttng_sessiond
 165
 166 for limit in "${LIMITS[@]}";
 167 do
 168         test_tracefile_count_limit "$limit"
 169 done
 170
 171 stop_lttng_sessiond