static void test_merge(void) { gpr_histogram *h1, *h2; double last; double i; double cur; LOG_TEST("test_merge"); h1 = gpr_histogram_create(0.05, 1e9); gpr_histogram_add(h1, 2.5); gpr_histogram_add(h1, 2.5); gpr_histogram_add(h1, 8); gpr_histogram_add(h1, 4); h2 = gpr_histogram_create(0.01, 1e9); GPR_ASSERT(gpr_histogram_merge(h1, h2) == 0); gpr_histogram_destroy(h2); h2 = gpr_histogram_create(0.05, 1e10); GPR_ASSERT(gpr_histogram_merge(h1, h2) == 0); gpr_histogram_destroy(h2); h2 = gpr_histogram_create(0.05, 1e9); GPR_ASSERT(gpr_histogram_merge(h1, h2) == 1); GPR_ASSERT(gpr_histogram_count(h1) == 4); GPR_ASSERT(gpr_histogram_minimum(h1) == 2.5); GPR_ASSERT(gpr_histogram_maximum(h1) == 8); GPR_ASSERT(gpr_histogram_sum(h1) == 17); GPR_ASSERT(gpr_histogram_sum_of_squares(h1) == 92.5); GPR_ASSERT(gpr_histogram_mean(h1) == 4.25); GPR_ASSERT(gpr_histogram_variance(h1) == 5.0625); GPR_ASSERT(gpr_histogram_stddev(h1) == 2.25); gpr_histogram_destroy(h2); h2 = gpr_histogram_create(0.05, 1e9); gpr_histogram_add(h2, 7.0); gpr_histogram_add(h2, 17.0); gpr_histogram_add(h2, 1.0); GPR_ASSERT(gpr_histogram_merge(h1, h2) == 1); GPR_ASSERT(gpr_histogram_count(h1) == 7); GPR_ASSERT(gpr_histogram_minimum(h1) == 1.0); GPR_ASSERT(gpr_histogram_maximum(h1) == 17.0); GPR_ASSERT(gpr_histogram_sum(h1) == 42.0); GPR_ASSERT(gpr_histogram_sum_of_squares(h1) == 431.5); GPR_ASSERT(gpr_histogram_mean(h1) == 6.0); /* test monotonicity */ last = 0.0; for (i = 0; i < 100.0; i += 0.01) { cur = gpr_histogram_percentile(h1, i); GPR_ASSERT(cur >= last); last = cur; } gpr_histogram_destroy(h1); gpr_histogram_destroy(h2); }
static void test_percentile(void) { gpr_histogram *h; double last; double i; double cur; LOG_TEST("test_percentile"); h = gpr_histogram_create(0.05, 1e9); gpr_histogram_add(h, 2.5); gpr_histogram_add(h, 2.5); gpr_histogram_add(h, 8); gpr_histogram_add(h, 4); GPR_ASSERT(gpr_histogram_count(h) == 4); GPR_ASSERT(gpr_histogram_minimum(h) == 2.5); GPR_ASSERT(gpr_histogram_maximum(h) == 8); GPR_ASSERT(gpr_histogram_sum(h) == 17); GPR_ASSERT(gpr_histogram_sum_of_squares(h) == 92.5); GPR_ASSERT(gpr_histogram_mean(h) == 4.25); GPR_ASSERT(gpr_histogram_variance(h) == 5.0625); GPR_ASSERT(gpr_histogram_stddev(h) == 2.25); expect_percentile(h, -10, 2.5, 2.5); expect_percentile(h, 0, 2.5, 2.5); expect_percentile(h, 12.5, 2.5, 2.5); expect_percentile(h, 25, 2.5, 2.5); expect_percentile(h, 37.5, 2.5, 2.8); expect_percentile(h, 50, 3.0, 3.5); expect_percentile(h, 62.5, 3.5, 4.5); expect_percentile(h, 75, 5, 7.9); expect_percentile(h, 100, 8, 8); expect_percentile(h, 110, 8, 8); /* test monotonicity */ last = 0.0; for (i = 0; i < 100.0; i += 0.01) { cur = gpr_histogram_percentile(h, i); GPR_ASSERT(cur >= last); last = cur; } gpr_histogram_destroy(h); }
double gpr_histogram_stddev(gpr_histogram *h) { return sqrt(gpr_histogram_variance(h)); }