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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <gtest/gtest.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <unordered_set>
#include <hicn/test/test-utils.h>
extern "C" {
#include <hicn/util/hash.h>
#include <hicn/core/address_pair.h>
#include <hicn/core/listener.h>
}
static constexpr uint32_t init_val = 2166136261UL;
static constexpr int N_HASHES = 50000;
TEST(HashTest, MultipleHashesForSameAddrPair) {
address_pair_t pair =
address_pair_factory(_ADDRESS4_LOCALHOST(1), _ADDRESS4_LOCALHOST(2));
unsigned h1 = hash_struct(&pair);
unsigned h2 = hash_struct(&pair);
EXPECT_EQ(h1, h2);
}
TEST(HashTest, SameAddrPairs) {
address_pair_t pair1 =
address_pair_factory(_ADDRESS4_LOCALHOST(1), _ADDRESS4_LOCALHOST(2));
address_pair_t pair2 = pair1;
unsigned h1 = hash_struct(&pair1);
unsigned h2 = hash_struct(&pair2);
EXPECT_EQ(h1, h2);
}
TEST(HashTest, DifferentAddrPairs) {
address_pair_t pair1 =
address_pair_factory(_ADDRESS4_LOCALHOST(1), _ADDRESS4_LOCALHOST(2));
address_pair_t pair2 =
address_pair_factory(_ADDRESS4_LOCALHOST(3), _ADDRESS4_LOCALHOST(4));
unsigned h1 = hash_struct(&pair1);
unsigned h2 = hash_struct(&pair2);
EXPECT_NE(h1, h2);
}
TEST(HashTest, SameLocalDifferentRemote) {
address_pair_t pair1 =
address_pair_factory(_ADDRESS4_LOCALHOST(1), _ADDRESS4_LOCALHOST(2));
address_pair_t pair2 =
address_pair_factory(_ADDRESS4_LOCALHOST(1), _ADDRESS4_LOCALHOST(4));
unsigned h1 = hash_struct(&pair1);
unsigned h2 = hash_struct(&pair2);
EXPECT_NE(h1, h2);
}
TEST(HashTest, SameRemoteDifferentLocal) {
address_pair_t pair1 =
address_pair_factory(_ADDRESS4_LOCALHOST(1), _ADDRESS4_LOCALHOST(2));
address_pair_t pair2 =
address_pair_factory(_ADDRESS4_LOCALHOST(3), _ADDRESS4_LOCALHOST(2));
unsigned h1 = hash_struct(&pair1);
unsigned h2 = hash_struct(&pair2);
EXPECT_NE(h1, h2);
}
TEST(HashTest, SameAddresses) {
address_t addr1 = _ADDRESS4_LOCALHOST(1);
address_t addr2 = _ADDRESS4_LOCALHOST(1);
unsigned h1 = hash_struct(&addr1);
unsigned h2 = hash_struct(&addr2);
EXPECT_EQ(h1, h2);
}
TEST(HashTest, SameListenerKeys) {
listener_key_t key1 =
listener_key_factory(_ADDRESS4_LOCALHOST(1), FACE_TYPE_UDP_LISTENER);
listener_key_t key2 =
listener_key_factory(_ADDRESS4_LOCALHOST(1), FACE_TYPE_UDP_LISTENER);
unsigned h1 = hash_struct(&key1);
unsigned h2 = hash_struct(&key2);
EXPECT_EQ(h1, h2);
}
TEST(HashTest, Collisions) {
std::unordered_set<uint32_t> hashes;
int n_collisions = 0;
for (int i = 0; i < 50000; i++) {
uint32_t seg = i;
// u32 h = utils::hash::fnv32_buf(&seg, sizeof(seg));
// u32 h = cumulative_hash32(&seg, sizeof(uint32_t), init_val);
u32 h = hash(&seg, sizeof(seg));
if (hashes.find(h) != hashes.end()) n_collisions++;
hashes.insert(h);
}
EXPECT_EQ(n_collisions, 0);
}
/*** Compare FNV with Jenkins ***/
typedef struct {
uint32_t data[6];
} small_struct_t; // Same size as 'NameBitvector'
typedef struct {
uint64_t data[32];
} big_struct_t; // Same size as 'address_pair_t'
TEST(HashTest, PerformanceComparisonSmallStruct) {
small_struct_t small_struct;
// FNV
auto time_fnv = get_execution_time([&]() {
for (int i = 0; i < N_HASHES; i++) {
small_struct.data[0] = i;
cumulative_hash32(&small_struct, sizeof(small_struct_t), init_val);
}
});
// Jenkins
auto time_jenkins = get_execution_time([&]() {
for (int i = 0; i < N_HASHES; i++) {
small_struct.data[0] = i;
hash(&small_struct, sizeof(small_struct_t));
}
});
std::cout << "Small struct (size = " << sizeof(small_struct_t) << " bytes)\n";
std::cout << "FNV: " << time_fnv << "ms\n";
std::cout << "Jenkins: " << time_jenkins << "ms\n";
}
TEST(HashTest, PerformanceComparisonBigStruct) {
big_struct_t big_struct;
// FNV
auto time_fnv = get_execution_time([&]() {
for (int i = 0; i < N_HASHES; i++) {
big_struct.data[0] = i;
cumulative_hash32(&big_struct, sizeof(big_struct_t), init_val);
}
});
// Jenkins
auto time_jenkins = get_execution_time([&]() {
for (int i = 0; i < N_HASHES; i++) {
big_struct.data[0] = i;
hash(&big_struct, sizeof(big_struct_t));
}
});
std::cout << "Big struct (size = " << sizeof(big_struct_t) << " bytes)\n";
std::cout << "FNV: " << time_fnv << "ms\n";
std::cout << "Jenkins: " << time_jenkins << "ms\n";
}
TEST(HashTest, CollisionsComparison) {
small_struct_t small_struct = {0};
std::unordered_set<uint32_t> hashes;
int n_collisions_fnv = 0, n_collisions_jenkins = 0;
// FNV
for (int i = 0; i < 10 * N_HASHES; i++) {
small_struct.data[0] = i;
uint32_t h =
cumulative_hash32(&small_struct, sizeof(small_struct_t), init_val);
if (hashes.find(h) != hashes.end()) n_collisions_fnv++;
hashes.insert(h);
}
hashes.clear();
// Jenkins
for (int i = 0; i < 10 * N_HASHES; i++) {
small_struct.data[0] = i;
uint32_t h = hash(&small_struct, sizeof(small_struct_t));
if (hashes.find(h) != hashes.end()) n_collisions_jenkins++;
hashes.insert(h);
}
std::cout << "Small struct (size = " << sizeof(small_struct_t) << " bytes)\n";
std::cout << "FNV: " << n_collisions_fnv << " collision/s\n";
std::cout << "Jenkins: " << n_collisions_jenkins << " collision/s\n";
}
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