src/utils_latency_test.c

   1 /**
   2  * collectd - src/utils_latency_test.c
   3  * Copyright (C) 2015       Florian octo Forster
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *   Florian octo Forster <octo at collectd.org>
  25  */
  26
  27 #define DBL_PRECISION 1e-9
  28
  29 #include "common.h" /* for STATIC_ARRAY_SIZE */
  30 #include "collectd.h"
  31
  32 #include "testing.h"
  33 #include "utils_latency.h"
  34 #include "utils_time.h"
  35
  36 DEF_TEST(simple) {
  37   struct {
  38     double val;
  39     double min;
  40     double max;
  41     double sum;
  42     double avg;
  43   } cases[] = {
  44       /* val  min  max  sum   avg */
  45       {0.5, 0.5, 0.5, 0.5, 0.5}, {0.3, 0.3, 0.5, 0.8, 0.4},
  46       {0.7, 0.3, 0.7, 1.5, 0.5}, {2.5, 0.3, 2.5, 4.0, 1.0},
  47       {99, 0.3, 99, 103, 20.6},
  48       /* { -1, 0.3,  99, 103, 20.6}, see issue #1139 */
  49   };
  50   latency_counter_t *l;
  51
  52   CHECK_NOT_NULL(l = latency_counter_create());
  53
  54   for (size_t i = 0; i < STATIC_ARRAY_SIZE(cases); i++) {
  55     printf("# case %zu: DOUBLE_TO_CDTIME_T(%g) = %" PRIu64 "\n", i,
  56            cases[i].val, DOUBLE_TO_CDTIME_T(cases[i].val));
  57     latency_counter_add(l, DOUBLE_TO_CDTIME_T(cases[i].val));
  58
  59     EXPECT_EQ_DOUBLE(cases[i].min,
  60                      CDTIME_T_TO_DOUBLE(latency_counter_get_min(l)));
  61     EXPECT_EQ_DOUBLE(cases[i].max,
  62                      CDTIME_T_TO_DOUBLE(latency_counter_get_max(l)));
  63     EXPECT_EQ_DOUBLE(cases[i].sum,
  64                      CDTIME_T_TO_DOUBLE(latency_counter_get_sum(l)));
  65     EXPECT_EQ_DOUBLE(cases[i].avg,
  66                      CDTIME_T_TO_DOUBLE(latency_counter_get_average(l)));
  67   }
  68
  69   latency_counter_destroy(l);
  70   return 0;
  71 }
  72
  73 DEF_TEST(percentile) {
  74   latency_counter_t *l;
  75
  76   CHECK_NOT_NULL(l = latency_counter_create());
  77
  78   for (size_t i = 0; i < 100; i++) {
  79     latency_counter_add(l, TIME_T_TO_CDTIME_T(((time_t)i) + 1));
  80   }
  81
  82   EXPECT_EQ_DOUBLE(1.0, CDTIME_T_TO_DOUBLE(latency_counter_get_min(l)));
  83   EXPECT_EQ_DOUBLE(100.0, CDTIME_T_TO_DOUBLE(latency_counter_get_max(l)));
  84   EXPECT_EQ_DOUBLE(100.0 * 101.0 / 2.0,
  85                    CDTIME_T_TO_DOUBLE(latency_counter_get_sum(l)));
  86   EXPECT_EQ_DOUBLE(50.5, CDTIME_T_TO_DOUBLE(latency_counter_get_average(l)));
  87
  88   EXPECT_EQ_DOUBLE(50.0,
  89                    CDTIME_T_TO_DOUBLE(latency_counter_get_percentile(l, 50.0)));
  90   EXPECT_EQ_DOUBLE(80.0,
  91                    CDTIME_T_TO_DOUBLE(latency_counter_get_percentile(l, 80.0)));
  92   EXPECT_EQ_DOUBLE(95.0,
  93                    CDTIME_T_TO_DOUBLE(latency_counter_get_percentile(l, 95.0)));
  94   EXPECT_EQ_DOUBLE(99.0,
  95                    CDTIME_T_TO_DOUBLE(latency_counter_get_percentile(l, 99.0)));
  96
  97   CHECK_ZERO(latency_counter_get_percentile(l, -1.0));
  98   CHECK_ZERO(latency_counter_get_percentile(l, 101.0));
  99
 100   latency_counter_destroy(l);
 101   return 0;
 102 }
 103
 104 int main(void) {
 105   RUN_TEST(simple);
 106   RUN_TEST(percentile);
 107
 108   END_TEST;
 109 }
 110
 111 /* vim: set sw=2 sts=2 et : */