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#include <library/cpp/testing/gtest/gtest.h>
#include <library/cpp/yt/memory/free_list.h>
#include <util/random/random.h>
#include <thread>
#include <stack>
#include <latch>
namespace NYT {
namespace {
using namespace std::chrono_literals;
////////////////////////////////////////////////////////////////////////////////
TEST(TFreeListTest, CompareAndSet)
{
TAtomicUint128 v = 0;
ui64 p1 = 0;
ui64 p2 = 0;
EXPECT_TRUE(CompareAndSet(&v, p1, p2, ui64{13}, ui64{9}));
EXPECT_FALSE(CompareAndSet(&v, p1, p2, ui64{100}, ui64{500}));
EXPECT_EQ(13u, p1);
EXPECT_EQ(9u, p2);
EXPECT_TRUE(CompareAndSet(&v, p1, p2, ui64{100}, ui64{500}));
EXPECT_EQ(TAtomicUint128{500} << 64 | 100, v);
}
////////////////////////////////////////////////////////////////////////////////
struct TTestConfig
{
ui64 Threads;
ui64 MaxBatchSize;
std::chrono::seconds TimeLimit;
};
class TFreeListStressTest
: public testing::TestWithParam<TTestConfig>
{ };
struct TTestItem
: public NYT::TFreeListItemBase<TTestItem>
{
TTestItem() = default;
ui64 Value = 0;
ui64 IndexInSet = 0;
// Avoid false sharing.
char Padding[CacheLineSize - 2 * sizeof(ui64)];
};
class TTestItemSet
{
public:
static void Reset()
{
Items_.clear();
}
static TTestItemSet Allocate(size_t setSize)
{
TTestItemSet set;
for (size_t i = 0; i < setSize; ++i) {
Items_.push_back(std::make_unique<TTestItem>());
Items_.back()->IndexInSet = Items_.size() - 1;
set.Acquire(Items_.back().get());
}
return set;
}
void Acquire(TTestItem* item)
{
AcquiredItemIndices_.push(item->IndexInSet);
}
TTestItem* Release()
{
YT_VERIFY(!AcquiredItemIndices_.empty());
size_t index = AcquiredItemIndices_.top();
AcquiredItemIndices_.pop();
return Items_[index].get();
}
private:
inline static std::vector<std::unique_ptr<TTestItem>> Items_;
std::stack<size_t> AcquiredItemIndices_;
};
TEST_P(TFreeListStressTest, Stress)
{
TTestItemSet::Reset();
SetRandomSeed(0x424242);
auto params = GetParam();
TFreeList<TTestItem> list;
std::latch start(params.Threads);
std::atomic<bool> running{true};
std::atomic<ui64> put{0};
std::atomic<ui64> extracted{0};
std::vector<std::thread> workers;
for (ui64 i = 0; i < params.Threads; ++i) {
auto itemSet = TTestItemSet::Allocate(params.MaxBatchSize);
workers.emplace_back([&, params, itemSet = std::move(itemSet)]() mutable {
start.arrive_and_wait();
while (running.load(std::memory_order::relaxed)) {
// Push batch of items.
ui64 batchSize = 1 + RandomNumber<ui64>(params.MaxBatchSize);
for (ui64 i = 0; i < batchSize; ++i) {
auto* item = itemSet.Release();
item->Value = 1 + RandomNumber<ui64>(1e9);
put.fetch_add(item->Value, std::memory_order::relaxed);
list.Put(item);
}
// Pop batch of items.
for (ui64 i = 0; i < batchSize; ++i) {
auto* item = list.Extract();
ASSERT_NE(item, nullptr);
extracted.fetch_add(item->Value, std::memory_order::relaxed);
itemSet.Acquire(item);
}
}
});
}
Sleep(params.TimeLimit);
running.store(false);
for (auto& worker : workers) {
worker.join();
}
Cerr << "Put: " << put.load() << Endl;
Cerr << "Extracted: " << extracted.load() << Endl;
EXPECT_EQ(put.load(), extracted.load());
}
INSTANTIATE_TEST_SUITE_P(
TFreeListTest,
TFreeListStressTest,
testing::Values(
TTestConfig{4, 1, 15s},
TTestConfig{4, 3, 15s},
TTestConfig{4, 5, 15s}));
////////////////////////////////////////////////////////////////////////////////
} // namespace
} // namespace NYT
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