test/core/iomgr/time_averaged_stats_test.c

/*
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#include "src/core/iomgr/time_averaged_stats.h"

#include <math.h>

#include <grpc/support/log.h>
#include "test/core/util/test_config.h"

#define EXPECT_EQ(a, b) GPR_ASSERT((a) == (b))
#define EXPECT_DOUBLE_EQ(a, b) GPR_ASSERT(fabs((a) - (b)) < 1e-9)

static void
no_regress_no_persist_test_1 (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 0, 0.0);
  EXPECT_DOUBLE_EQ (1000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (0, tas.aggregate_total_weight);

  /* Should have no effect */
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (1000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (0, tas.aggregate_total_weight);

  /* Should replace old average */
  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (2000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (1, tas.aggregate_total_weight);
}

static void
no_regress_no_persist_test_2 (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 0, 0.0);
  EXPECT_DOUBLE_EQ (1000, tas.aggregate_weighted_avg);
  /* Should replace init value */
  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (2000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (1, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 3000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (3000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (1, tas.aggregate_total_weight);
}

static void
no_regress_no_persist_test_3 (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 0, 0.0);
  EXPECT_DOUBLE_EQ (1000, tas.aggregate_weighted_avg);
  /* Should replace init value */
  grpc_time_averaged_stats_add_sample (&tas, 2500);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (2500, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (1, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 3500);
  grpc_time_averaged_stats_add_sample (&tas, 4500);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (4000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2, tas.aggregate_total_weight);
}

static void
some_regress_no_persist_test (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 0.5, 0.0);
  EXPECT_DOUBLE_EQ (1000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (0, tas.aggregate_total_weight);
  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  /* (2 * 2000 + 0.5 * 1000) / 2.5 */
  EXPECT_DOUBLE_EQ (1800, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2.5, tas.aggregate_total_weight);
}

static void
some_decay_test (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 1, 0.0);
  EXPECT_EQ (1000, tas.aggregate_weighted_avg);
  /* Should avg with init value */
  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (1500, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (1500, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (1500, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2, tas.aggregate_total_weight);
}

static void
no_regress_full_persist_test (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 0, 1.0);
  EXPECT_DOUBLE_EQ (1000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (0, tas.aggregate_total_weight);

  /* Should replace init value */
  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_EQ (2000, tas.aggregate_weighted_avg);
  EXPECT_EQ (1, tas.aggregate_total_weight);

  /* Will result in average of the 3 samples. */
  grpc_time_averaged_stats_add_sample (&tas, 2300);
  grpc_time_averaged_stats_add_sample (&tas, 2300);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (2200, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (3, tas.aggregate_total_weight);
}

static void
no_regress_some_persist_test (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 0, 0.5);
  /* Should replace init value */
  grpc_time_averaged_stats_add_sample (&tas, 2000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (2000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (1, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 2500);
  grpc_time_averaged_stats_add_sample (&tas, 4000);
  grpc_time_averaged_stats_update_average (&tas);
  EXPECT_DOUBLE_EQ (3000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2.5, tas.aggregate_total_weight);
}

static void
some_regress_some_persist_test (void)
{
  grpc_time_averaged_stats tas;
  grpc_time_averaged_stats_init (&tas, 1000, 0.4, 0.6);
  /* Sample weight = 0 */
  EXPECT_EQ (1000, tas.aggregate_weighted_avg);
  EXPECT_EQ (0, tas.aggregate_total_weight);

  grpc_time_averaged_stats_update_average (&tas);
  /* (0.6 * 0 * 1000 + 0.4 * 1000 / 0.4) */
  EXPECT_DOUBLE_EQ (1000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (0.4, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 2640);
  grpc_time_averaged_stats_update_average (&tas);
  /* (1 * 2640 + 0.6 * 0.4 * 1000 + 0.4 * 1000 / (1 + 0.6 * 0.4 + 0.4) */
  EXPECT_DOUBLE_EQ (2000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (1.64, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 2876.8);
  grpc_time_averaged_stats_update_average (&tas);
  /* (1 * 2876.8 + 0.6 * 1.64 * 2000 + 0.4 * 1000 / (1 + 0.6 * 1.64 + 0.4) */
  EXPECT_DOUBLE_EQ (2200, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2.384, tas.aggregate_total_weight);

  grpc_time_averaged_stats_add_sample (&tas, 4944.32);
  grpc_time_averaged_stats_update_average (&tas);
  /* (1 * 4944.32 + 0.6 * 2.384 * 2200 + 0.4 * 1000) /
     (1 + 0.6 * 2.384 + 0.4) */
  EXPECT_DOUBLE_EQ (3000, tas.aggregate_weighted_avg);
  EXPECT_DOUBLE_EQ (2.8304, tas.aggregate_total_weight);
}

int
main (int argc, char **argv)
{
  grpc_test_init (argc, argv);
  no_regress_no_persist_test_1 ();
  no_regress_no_persist_test_2 ();
  no_regress_no_persist_test_3 ();
  some_regress_no_persist_test ();
  some_decay_test ();
  no_regress_full_persist_test ();
  no_regress_some_persist_test ();
  some_regress_some_persist_test ();
  return 0;
}