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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/threading/thread_local_storage.h"
#include <stddef.h>
#include <memory>
#include <vector>
#include "base/barrier_closure.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/raw_ptr.h"
#include "base/synchronization/waitable_event.h"
#include "base/test/bind.h"
#include "base/threading/simple_thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/perf/perf_result_reporter.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#include "base/win/windows_types.h"
#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
#include <pthread.h>
#endif
namespace base::internal {
namespace {
constexpr size_t kCount = 5000000;
constexpr char kMetricPrefixThreadLocalStorage[] = "ThreadLocalStorage.";
constexpr char kMetricBaseRead[] = "read";
constexpr char kMetricBaseWrite[] = "write";
constexpr char kMetricBaseReadWrite[] = "read_write";
constexpr char kMetricSuffixThroughput[] = "_throughput";
constexpr char kMetricSuffixOperationTime[] = "_operation_time";
constexpr char kStoryBaseTLS[] = "thread_local_storage";
#if BUILDFLAG(IS_WIN)
constexpr char kStoryBasePlatformFLS[] = "platform_fiber_local_storage";
#endif // BUILDFLAG(IS_WIN)
constexpr char kStoryBasePlatformTLS[] = "platform_thread_local_storage";
constexpr char kStoryBaseCPPTLS[] = "c++_platform_thread_local_storage";
constexpr char kStorySuffixFourThreads[] = "_4_threads";
perf_test::PerfResultReporter SetUpReporter(const std::string& story_name) {
perf_test::PerfResultReporter reporter(kMetricPrefixThreadLocalStorage,
story_name);
reporter.RegisterImportantMetric(
std::string(kMetricBaseRead) + kMetricSuffixThroughput, "runs/s");
reporter.RegisterImportantMetric(
std::string(kMetricBaseRead) + kMetricSuffixOperationTime, "ns");
reporter.RegisterImportantMetric(
std::string(kMetricBaseWrite) + kMetricSuffixThroughput, "runs/s");
reporter.RegisterImportantMetric(
std::string(kMetricBaseWrite) + kMetricSuffixOperationTime, "ns");
reporter.RegisterImportantMetric(
std::string(kMetricBaseReadWrite) + kMetricSuffixThroughput, "runs/s");
reporter.RegisterImportantMetric(
std::string(kMetricBaseReadWrite) + kMetricSuffixOperationTime, "ns");
return reporter;
}
// A thread that waits for the caller to signal an event before proceeding to
// call action.Run().
class TLSThread : public SimpleThread {
public:
// Creates a PostingThread that waits on |start_event| before calling
// action.Run().
TLSThread(WaitableEvent* start_event,
base::OnceClosure action,
base::OnceClosure completion)
: SimpleThread("TLSThread"),
start_event_(start_event),
action_(std::move(action)),
completion_(std::move(completion)) {
Start();
}
TLSThread(const TLSThread&) = delete;
TLSThread& operator=(const TLSThread&) = delete;
void Run() override {
start_event_->Wait();
std::move(action_).Run();
std::move(completion_).Run();
}
private:
const raw_ptr<WaitableEvent> start_event_;
base::OnceClosure action_;
base::OnceClosure completion_;
};
class ThreadLocalStoragePerfTest : public testing::Test {
public:
ThreadLocalStoragePerfTest(const ThreadLocalStoragePerfTest&) = delete;
ThreadLocalStoragePerfTest& operator=(const ThreadLocalStoragePerfTest&) =
delete;
protected:
ThreadLocalStoragePerfTest() = default;
~ThreadLocalStoragePerfTest() override = default;
template <class Read, class Write>
void Benchmark(const std::string& story_name,
Read read,
Write write,
size_t num_operation,
size_t num_threads) {
write(2);
BenchmarkImpl(kMetricBaseRead, story_name, base::BindLambdaForTesting([&] {
volatile intptr_t total = 0;
for (size_t i = 0; i < num_operation; ++i) {
total = total + read();
}
}),
num_operation, num_threads);
BenchmarkImpl(kMetricBaseWrite, story_name, base::BindLambdaForTesting([&] {
for (size_t i = 0; i < num_operation; ++i) {
write(i);
}
}),
num_operation, num_threads);
BenchmarkImpl(kMetricBaseReadWrite, story_name,
base::BindLambdaForTesting([&] {
for (size_t i = 0; i < num_operation; ++i) {
write(read() + 1);
}
}),
num_operation, num_threads);
}
void BenchmarkImpl(const std::string& metric_base,
const std::string& story_name,
base::RepeatingClosure action,
size_t num_operation,
size_t num_threads) {
WaitableEvent start_thread;
WaitableEvent complete_thread;
base::RepeatingClosure done = BarrierClosure(
num_threads,
base::BindLambdaForTesting([&] { complete_thread.Signal(); }));
std::vector<std::unique_ptr<TLSThread>> threads;
for (size_t i = 0; i < num_threads; ++i) {
threads.emplace_back(
std::make_unique<TLSThread>(&start_thread, action, done));
}
TimeTicks operation_start = TimeTicks::Now();
start_thread.Signal();
complete_thread.Wait();
TimeDelta operation_duration = TimeTicks::Now() - operation_start;
for (auto& thread : threads) {
thread->Join();
}
auto reporter = SetUpReporter(story_name);
reporter.AddResult(metric_base + kMetricSuffixThroughput,
num_operation / operation_duration.InSecondsF());
size_t nanos_per_operation =
operation_duration.InNanoseconds() / num_operation;
reporter.AddResult(metric_base + kMetricSuffixOperationTime,
nanos_per_operation);
}
};
} // namespace
TEST_F(ThreadLocalStoragePerfTest, ThreadLocalStorage) {
ThreadLocalStorage::Slot tls;
auto read = [&] { return reinterpret_cast<intptr_t>(tls.Get()); };
auto write = [&](intptr_t value) { tls.Set(reinterpret_cast<void*>(value)); };
Benchmark(kStoryBaseTLS, read, write, 10000000, 1);
Benchmark(std::string(kStoryBaseTLS) + kStorySuffixFourThreads, read, write,
kCount, 4);
}
#if BUILDFLAG(IS_WIN)
void WINAPI destroy(void*) {}
TEST_F(ThreadLocalStoragePerfTest, PlatformFls) {
DWORD key = FlsAlloc(destroy);
ASSERT_NE(PlatformThreadLocalStorage::TLS_KEY_OUT_OF_INDEXES, key);
auto read = [&] { return reinterpret_cast<intptr_t>(FlsGetValue(key)); };
auto write = [&](intptr_t value) {
FlsSetValue(key, reinterpret_cast<void*>(value));
};
Benchmark(kStoryBasePlatformFLS, read, write, 10000000, 1);
Benchmark(std::string(kStoryBasePlatformFLS) + kStorySuffixFourThreads, read,
write, kCount, 4);
}
TEST_F(ThreadLocalStoragePerfTest, PlatformTls) {
DWORD key = TlsAlloc();
ASSERT_NE(PlatformThreadLocalStorage::TLS_KEY_OUT_OF_INDEXES, key);
auto read = [&] { return reinterpret_cast<intptr_t>(TlsGetValue(key)); };
auto write = [&](intptr_t value) {
TlsSetValue(key, reinterpret_cast<void*>(value));
};
Benchmark(kStoryBasePlatformTLS, read, write, 10000000, 1);
Benchmark(std::string(kStoryBasePlatformTLS) + kStorySuffixFourThreads, read,
write, kCount, 4);
}
#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
TEST_F(ThreadLocalStoragePerfTest, PlatformTls) {
pthread_key_t key;
ASSERT_FALSE(pthread_key_create(&key, [](void*) {}));
ASSERT_NE(PlatformThreadLocalStorage::TLS_KEY_OUT_OF_INDEXES, key);
auto read = [&] {
return reinterpret_cast<intptr_t>(pthread_getspecific(key));
};
auto write = [&](intptr_t value) {
pthread_setspecific(key, reinterpret_cast<void*>(value));
};
Benchmark(kStoryBasePlatformTLS, read, write, 10000000, 1);
Benchmark(std::string(kStoryBasePlatformTLS) + kStorySuffixFourThreads, read,
write, kCount, 4);
}
#endif
TEST_F(ThreadLocalStoragePerfTest, Cpp11Tls) {
thread_local intptr_t thread_local_variable;
auto read = [&] { return thread_local_variable; };
auto write = [&](intptr_t value) {
reinterpret_cast<volatile intptr_t*>(&thread_local_variable)[0] = value;
};
Benchmark(kStoryBaseCPPTLS, read, write, 10000000, 1);
Benchmark(std::string(kStoryBaseCPPTLS) + kStorySuffixFourThreads, read,
write, kCount, 4);
}
} // namespace base::internal
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