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#include "tensorflow/core/lib/core/threadpool.h"
#include <atomic>
#include "tensorflow/core/platform/test_benchmark.h"
#include "tensorflow/core/public/env.h"
#include <gtest/gtest.h>
namespace tensorflow {
namespace thread {
static const int kNumThreads = 30;
TEST(ThreadPool, Empty) {
for (int num_threads = 1; num_threads < kNumThreads; num_threads++) {
fprintf(stderr, "Testing with %d threads\n", num_threads);
ThreadPool pool(Env::Default(), "test", num_threads);
}
}
TEST(ThreadPool, DoWork) {
for (int num_threads = 1; num_threads < kNumThreads; num_threads++) {
fprintf(stderr, "Testing with %d threads\n", num_threads);
const int kWorkItems = 15;
bool work[kWorkItems];
for (int i = 0; i < kWorkItems; i++) {
work[i] = false;
}
{
ThreadPool pool(Env::Default(), "test", num_threads);
for (int i = 0; i < kWorkItems; i++) {
pool.Schedule([&work, i]() {
ASSERT_FALSE(work[i]);
work[i] = true;
});
}
}
for (int i = 0; i < kWorkItems; i++) {
ASSERT_TRUE(work[i]);
}
}
}
static void BM_Sequential(int iters) {
ThreadPool pool(Env::Default(), "test", kNumThreads);
// Decrement count sequentially until 0.
int count = iters;
mutex done_lock;
condition_variable done;
bool done_flag = false;
std::function<void()> work = [&pool, &count, &done_lock, &done, &done_flag,
&work]() {
if (count--) {
pool.Schedule(work);
} else {
mutex_lock l(done_lock);
done_flag = true;
done.notify_all();
}
};
work();
mutex_lock l(done_lock);
if (!done_flag) {
done.wait(l);
}
}
BENCHMARK(BM_Sequential);
static void BM_Parallel(int iters) {
ThreadPool pool(Env::Default(), "test", kNumThreads);
// Decrement count concurrently until 0.
std::atomic_int_fast32_t count(iters);
mutex done_lock;
condition_variable done;
bool done_flag = false;
for (int i = 0; i < iters; ++i) {
pool.Schedule([&count, &done_lock, &done, &done_flag]() {
if (count.fetch_sub(1) == 1) {
mutex_lock l(done_lock);
done_flag = true;
done.notify_all();
}
});
}
mutex_lock l(done_lock);
if (!done_flag) {
done.wait(l);
}
}
BENCHMARK(BM_Parallel);
} // namespace thread
} // namespace tensorflow
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