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rocksdb/util/autovector_test.cc

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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#include <atomic>
#include <iostream>
#include <string>
#include <utility>
#include "rocksdb/env.h"
#include "test_util/testharness.h"
#include "test_util/testutil.h"
#include "util/autovector.h"
#include "util/string_util.h"
using std::cout;
using std::endl;
namespace ROCKSDB_NAMESPACE {
class AutoVectorTest : public testing::Test {};
const unsigned long kSize = 8;
namespace {
template <class T>
void AssertAutoVectorOnlyInStack(autovector<T, kSize>* vec, bool result) {
#ifndef ROCKSDB_LITE
ASSERT_EQ(vec->only_in_stack(), result);
#else
(void) vec;
(void) result;
#endif // !ROCKSDB_LITE
}
} // namespace
TEST_F(AutoVectorTest, PushBackAndPopBack) {
autovector<size_t, kSize> vec;
ASSERT_TRUE(vec.empty());
ASSERT_EQ(0ul, vec.size());
for (size_t i = 0; i < 1000 * kSize; ++i) {
vec.push_back(i);
ASSERT_TRUE(!vec.empty());
if (i < kSize) {
AssertAutoVectorOnlyInStack(&vec, true);
} else {
AssertAutoVectorOnlyInStack(&vec, false);
}
ASSERT_EQ(i + 1, vec.size());
ASSERT_EQ(i, vec[i]);
ASSERT_EQ(i, vec.at(i));
}
size_t size = vec.size();
while (size != 0) {
vec.pop_back();
// will always be in heap
AssertAutoVectorOnlyInStack(&vec, false);
ASSERT_EQ(--size, vec.size());
}
ASSERT_TRUE(vec.empty());
}
TEST_F(AutoVectorTest, EmplaceBack) {
using ValType = std::pair<size_t, std::string>;
autovector<ValType, kSize> vec;
for (size_t i = 0; i < 1000 * kSize; ++i) {
vec.emplace_back(i, std::to_string(i + 123));
ASSERT_TRUE(!vec.empty());
if (i < kSize) {
AssertAutoVectorOnlyInStack(&vec, true);
} else {
AssertAutoVectorOnlyInStack(&vec, false);
}
ASSERT_EQ(i + 1, vec.size());
ASSERT_EQ(i, vec[i].first);
ASSERT_EQ(std::to_string(i + 123), vec[i].second);
}
vec.clear();
ASSERT_TRUE(vec.empty());
AssertAutoVectorOnlyInStack(&vec, false);
}
TEST_F(AutoVectorTest, Resize) {
autovector<size_t, kSize> vec;
vec.resize(kSize);
AssertAutoVectorOnlyInStack(&vec, true);
for (size_t i = 0; i < kSize; ++i) {
vec[i] = i;
}
vec.resize(kSize * 2);
AssertAutoVectorOnlyInStack(&vec, false);
for (size_t i = 0; i < kSize; ++i) {
ASSERT_EQ(vec[i], i);
}
for (size_t i = 0; i < kSize; ++i) {
vec[i + kSize] = i;
}
vec.resize(1);
ASSERT_EQ(1U, vec.size());
}
namespace {
void AssertEqual(
const autovector<size_t, kSize>& a, const autovector<size_t, kSize>& b) {
ASSERT_EQ(a.size(), b.size());
ASSERT_EQ(a.empty(), b.empty());
#ifndef ROCKSDB_LITE
ASSERT_EQ(a.only_in_stack(), b.only_in_stack());
#endif // !ROCKSDB_LITE
for (size_t i = 0; i < a.size(); ++i) {
ASSERT_EQ(a[i], b[i]);
}
}
} // namespace
TEST_F(AutoVectorTest, CopyAndAssignment) {
// Test both heap-allocated and stack-allocated cases.
for (auto size : { kSize / 2, kSize * 1000 }) {
autovector<size_t, kSize> vec;
for (size_t i = 0; i < size; ++i) {
vec.push_back(i);
}
{
autovector<size_t, kSize> other;
other = vec;
AssertEqual(other, vec);
}
{
autovector<size_t, kSize> other(vec);
AssertEqual(other, vec);
}
}
}
TEST_F(AutoVectorTest, Iterators) {
autovector<std::string, kSize> vec;
for (size_t i = 0; i < kSize * 1000; ++i) {
vec.push_back(std::to_string(i));
}
// basic operator test
ASSERT_EQ(vec.front(), *vec.begin());
ASSERT_EQ(vec.back(), *(vec.end() - 1));
ASSERT_TRUE(vec.begin() < vec.end());
// non-const iterator
size_t index = 0;
for (const auto& item : vec) {
ASSERT_EQ(vec[index++], item);
}
index = vec.size() - 1;
for (auto pos = vec.rbegin(); pos != vec.rend(); ++pos) {
ASSERT_EQ(vec[index--], *pos);
}
// const iterator
const auto& cvec = vec;
index = 0;
for (const auto& item : cvec) {
ASSERT_EQ(cvec[index++], item);
}
index = vec.size() - 1;
for (auto pos = cvec.rbegin(); pos != cvec.rend(); ++pos) {
ASSERT_EQ(cvec[index--], *pos);
}
// forward and backward
auto pos = vec.begin();
while (pos != vec.end()) {
auto old_val = *pos;
auto old = pos++;
// HACK: make sure -> works
ASSERT_TRUE(!old->empty());
ASSERT_EQ(old_val, *old);
ASSERT_TRUE(pos == vec.end() || old_val != *pos);
}
pos = vec.begin();
for (size_t i = 0; i < vec.size(); i += 2) {
// Cannot use ASSERT_EQ since that macro depends on iostream serialization
ASSERT_TRUE(pos + 2 - 2 == pos);
pos += 2;
ASSERT_TRUE(pos >= vec.begin());
ASSERT_TRUE(pos <= vec.end());
size_t diff = static_cast<size_t>(pos - vec.begin());
ASSERT_EQ(i + 2, diff);
}
}
namespace {
std::vector<std::string> GetTestKeys(size_t size) {
std::vector<std::string> keys;
keys.resize(size);
int index = 0;
for (auto& key : keys) {
key = "item-" + std::to_string(index++);
}
return keys;
}
} // namespace
template <class TVector>
void BenchmarkVectorCreationAndInsertion(
std::string name, size_t ops, size_t item_size,
const std::vector<typename TVector::value_type>& items) {
auto env = Env::Default();
int index = 0;
auto start_time = env->NowNanos();
auto ops_remaining = ops;
while(ops_remaining--) {
TVector v;
for (size_t i = 0; i < item_size; ++i) {
v.push_back(items[index++]);
}
}
auto elapsed = env->NowNanos() - start_time;
cout << "created " << ops << " " << name << " instances:\n\t"
<< "each was inserted with " << item_size << " elements\n\t"
<< "total time elapsed: " << elapsed << " (ns)" << endl;
}
template <class TVector>
size_t BenchmarkSequenceAccess(std::string name, size_t ops, size_t elem_size) {
TVector v;
for (const auto& item : GetTestKeys(elem_size)) {
v.push_back(item);
}
auto env = Env::Default();
auto ops_remaining = ops;
auto start_time = env->NowNanos();
size_t total = 0;
while (ops_remaining--) {
auto end = v.end();
for (auto pos = v.begin(); pos != end; ++pos) {
total += pos->size();
}
}
auto elapsed = env->NowNanos() - start_time;
cout << "performed " << ops << " sequence access against " << name << "\n\t"
<< "size: " << elem_size << "\n\t"
<< "total time elapsed: " << elapsed << " (ns)" << endl;
// HACK avoid compiler's optimization to ignore total
return total;
}
// This test case only reports the performance between std::vector<std::string>
// and autovector<std::string>. We chose string for comparison because in most
// of our use cases we used std::vector<std::string>.
TEST_F(AutoVectorTest, PerfBench) {
// We run same operations for kOps times in order to get a more fair result.
size_t kOps = 100000;
// Creation and insertion test
// Test the case when there is:
// * no element inserted: internal array of std::vector may not really get
// initialize.
// * one element inserted: internal array of std::vector must have
// initialized.
// * kSize elements inserted. This shows the most time we'll spend if we
// keep everything in stack.
// * 2 * kSize elements inserted. The internal vector of
// autovector must have been initialized.
cout << "=====================================================" << endl;
cout << "Creation and Insertion Test (value type: std::string)" << endl;
cout << "=====================================================" << endl;
// pre-generated unique keys
auto string_keys = GetTestKeys(kOps * 2 * kSize);
for (auto insertions : { 0ul, 1ul, kSize / 2, kSize, 2 * kSize }) {
BenchmarkVectorCreationAndInsertion<std::vector<std::string>>(
"std::vector<std::string>", kOps, insertions, string_keys);
BenchmarkVectorCreationAndInsertion<autovector<std::string, kSize>>(
"autovector<std::string>", kOps, insertions, string_keys);
cout << "-----------------------------------" << endl;
}
cout << "=====================================================" << endl;
cout << "Creation and Insertion Test (value type: uint64_t)" << endl;
cout << "=====================================================" << endl;
// pre-generated unique keys
std::vector<uint64_t> int_keys(kOps * 2 * kSize);
for (size_t i = 0; i < kOps * 2 * kSize; ++i) {
int_keys[i] = i;
}
for (auto insertions : { 0ul, 1ul, kSize / 2, kSize, 2 * kSize }) {
BenchmarkVectorCreationAndInsertion<std::vector<uint64_t>>(
"std::vector<uint64_t>", kOps, insertions, int_keys);
BenchmarkVectorCreationAndInsertion<autovector<uint64_t, kSize>>(
"autovector<uint64_t>", kOps, insertions, int_keys
);
cout << "-----------------------------------" << endl;
}
// Sequence Access Test
cout << "=====================================================" << endl;
cout << "Sequence Access Test" << endl;
cout << "=====================================================" << endl;
for (auto elem_size : { kSize / 2, kSize, 2 * kSize }) {
BenchmarkSequenceAccess<std::vector<std::string>>("std::vector", kOps,
elem_size);
BenchmarkSequenceAccess<autovector<std::string, kSize>>("autovector", kOps,
elem_size);
cout << "-----------------------------------" << endl;
}
}
} // namespace ROCKSDB_NAMESPACE
int main(int argc, char** argv) {
ROCKSDB_NAMESPACE::port::InstallStackTraceHandler();
::testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}