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));
}
