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/**
* Copyright (C) 2022-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/latency_distribution.h"
namespace mongo {
TEST(LatencyDistributionTest, WorksWithInterpolation) {
constexpr auto resolution = Microseconds{100};
LatencyPercentileDistribution distribution{resolution};
for (int i = 0; i < 100; i++) {
distribution.addEntry(resolution);
}
ASSERT_EQ(distribution.getPercentile(0.0f), Microseconds{0});
ASSERT_EQ(distribution.getPercentile(0.75f), Microseconds{75});
}
TEST(LatencyDistributionTest, MergesWorkCorrectly) {
constexpr auto resolution = Microseconds{100};
LatencyPercentileDistribution distribution1{resolution};
LatencyPercentileDistribution distribution2{resolution};
for (int i = 0; i < 100; i++) {
distribution1.addEntry(resolution);
distribution2.addEntry(resolution * 2);
}
auto merged = distribution1.mergeWith(distribution2);
ASSERT_EQ(merged.numEntries(), 200);
ASSERT_EQ(merged.getMax(), Microseconds{200});
ASSERT_EQ(merged.getPercentile(0.6f), Microseconds{120});
ASSERT_EQ(merged.getPercentile(0.5f), Microseconds{100});
}
} // namespace mongo
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