Temporarily disable benchmarks (#27629)

benchmark 1.6.0 introduced API breaking changes so we temporarily disabled the benchmarks that are using the old API to avoid breaking.

test/cpp/microbenchmarks/bm_cq_multiple_threads.cc

@@ -162,7 +162,7 @@ static void teardown() {
 */
 static void BM_Cq_Throughput(benchmark::State& state) {
   gpr_timespec deadline = gpr_inf_future(GPR_CLOCK_MONOTONIC);
-  auto thd_idx = state.thread_index;
+  auto thd_idx = hack::get_thread_idx(state);
 
   gpr_mu_lock(&g_mu);
   g_threads_active++;

test/cpp/microbenchmarks/bm_threadpool.cc

@@ -152,12 +152,13 @@ class SuicideFunctorForAdd : public grpc_completion_queue_functor {
 // Performs the scenario of external thread(s) adding closures into pool.
 static void BM_ThreadPoolExternalAdd(benchmark::State& state) {
   static grpc_core::ThreadPool* external_add_pool = nullptr;
+  int thread_idx = hack::get_thread_idx(state);
   // Setup for each run of test.
-  if (state.thread_index == 0) {
+  if (thread_idx == 0) {
     const int num_threads = state.range(1);
     external_add_pool = new grpc_core::ThreadPool(num_threads);
   }
-  const int num_iterations = state.range(0) / state.threads;
+  const int num_iterations = state.range(0) / hack::get_threads(state);
   while (state.KeepRunningBatch(num_iterations)) {
     BlockingCounter counter(num_iterations);
     for (int i = 0; i < num_iterations; ++i) {
@@ -167,7 +168,7 @@ static void BM_ThreadPoolExternalAdd(benchmark::State& state) {
   }
 
   // Teardown at the end of each test run.
-  if (state.thread_index == 0) {
+  if (thread_idx == 0) {
     state.SetItemsProcessed(state.range(0));
     delete external_add_pool;
   }

test/cpp/util/test_config.h

@@ -19,6 +19,8 @@
 #ifndef GRPC_TEST_CPP_UTIL_TEST_CONFIG_H
 #define GRPC_TEST_CPP_UTIL_TEST_CONFIG_H
 
+#include <type_traits>
+
 #ifndef GRPC_GTEST_FLAG_SET_DEATH_TEST_STYLE
 #define GRPC_GTEST_FLAG_SET_DEATH_TEST_STYLE(style) \
   ::testing::FLAGS_gtest_death_test_style = style
@@ -29,6 +31,35 @@ namespace testing {
 
 void InitTest(int* argc, char*** argv, bool remove_flags);
 
+// FIXME(vyng): remove this
+// This is hack to accommdate accessing .threads and .thread_index on benchmark
+// State object. (In 1.6.0, the fields were made into methods, hence it's API
+// breaking).
+
+namespace hack {
+
+template <typename T>
+auto get_threads(T& t) -> decltype(t.threads()) {
+  return t.threads();
+}
+
+template <typename T>
+auto get_threads(T& t) -> decltype(t.threads) {
+  return t.threads;
+}
+
+template <typename T>
+auto get_thread_idx(T& t) -> decltype(t.thread_index()) {
+  return t.thread_index();
+}
+
+template <typename T>
+auto get_thread_idx(T& t) -> decltype(t.thread_index) {
+  return t.thread_index;
+}
+
+}  // namespace hack
+
 }  // namespace testing
 }  // namespace grpc