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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/log/log.h>
LOG_SETUP("generation_handler_stress_test");
#include <vespa/vespalib/testkit/testapp.h>
#include <vespa/vespalib/util/generationhandler.h>
#include <vespa/vespalib/util/threadstackexecutor.h>
#include <vespa/vespalib/util/size_literals.h>
using vespalib::Executor;
using vespalib::GenerationHandler;
using vespalib::ThreadStackExecutor;
struct WorkContext
{
std::atomic<uint64_t> _generation;
WorkContext() noexcept
: _generation(0)
{
}
};
struct Fixture {
GenerationHandler _generationHandler;
uint32_t _readThreads;
ThreadStackExecutor _writer; // 1 write thread
ThreadStackExecutor _readers; // multiple reader threads
std::atomic<long> _readSeed;
std::atomic<long> _doneWriteWork;
std::atomic<long> _doneReadWork;
std::atomic<int> _stopRead;
bool _reportWork;
Fixture(uint32_t readThreads = 1);
~Fixture();
void readWork(const WorkContext &context);
void writeWork(uint32_t cnt, WorkContext &context);
uint32_t getReadThreads() const { return _readThreads; }
void stressTest(uint32_t writeCnt);
private:
Fixture(const Fixture &index) = delete;
Fixture(Fixture &&index) = delete;
Fixture &operator=(const Fixture &index) = delete;
Fixture &operator=(Fixture &&index) = delete;
};
Fixture::Fixture(uint32_t readThreads)
: _generationHandler(),
_readThreads(readThreads),
_writer(1, 128_Ki),
_readers(readThreads, 128_Ki),
_doneWriteWork(0),
_doneReadWork(0),
_stopRead(0),
_reportWork(false)
{
}
Fixture::~Fixture()
{
_readers.sync();
_readers.shutdown();
_writer.sync();
_writer.shutdown();
if (_reportWork) {
LOG(info,
"readWork=%ld, writeWork=%ld",
_doneReadWork.load(), _doneWriteWork.load());
}
}
void
Fixture::readWork(const WorkContext &context)
{
uint32_t i;
uint32_t cnt = std::numeric_limits<uint32_t>::max();
for (i = 0; i < cnt && _stopRead.load() == 0; ++i) {
auto guard = _generationHandler.takeGuard();
auto generation = context._generation.load(std::memory_order_relaxed);
EXPECT_GREATER_EQUAL(generation, guard.getGeneration());
}
_doneReadWork += i;
LOG(info, "done %u read work", i);
}
void
Fixture::writeWork(uint32_t cnt, WorkContext &context)
{
for (uint32_t i = 0; i < cnt; ++i) {
context._generation.store(_generationHandler.getNextGeneration(), std::memory_order_relaxed);
_generationHandler.incGeneration();
}
_doneWriteWork += cnt;
_stopRead = 1;
LOG(info, "done %u write work", cnt);
}
namespace
{
class ReadWorkTask : public vespalib::Executor::Task
{
Fixture &_f;
std::shared_ptr<WorkContext> _context;
public:
ReadWorkTask(Fixture &f, std::shared_ptr<WorkContext> context)
: _f(f),
_context(context)
{
}
virtual void run() override { _f.readWork(*_context); }
};
class WriteWorkTask : public vespalib::Executor::Task
{
Fixture &_f;
uint32_t _cnt;
std::shared_ptr<WorkContext> _context;
public:
WriteWorkTask(Fixture &f, uint32_t cnt,
std::shared_ptr<WorkContext> context)
: _f(f),
_cnt(cnt),
_context(context)
{
}
virtual void run() override { _f.writeWork(_cnt, *_context); }
};
}
void
Fixture::stressTest(uint32_t writeCnt)
{
_reportWork = true;
uint32_t readThreads = getReadThreads();
LOG(info,
"starting stress test, 1 write thread, %u read threads, %u writes",
readThreads, writeCnt);
auto context = std::make_shared<WorkContext>();
_writer.execute(std::make_unique<WriteWorkTask>(*this, writeCnt, context));
for (uint32_t i = 0; i < readThreads; ++i) {
_readers.execute(std::make_unique<ReadWorkTask>(*this, context));
}
}
TEST_F("stress test, 2 readers", Fixture(2))
{
f.stressTest(1000000);
}
TEST_F("stress test, 4 readers", Fixture(4))
{
f.stressTest(1000000);
}
TEST_MAIN() { TEST_RUN_ALL(); }
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