Disabled unstable tests

paddle/fluid/operators/detail/grpc_server_test.cc

@@ -111,7 +111,7 @@ void StartServer(const std::string& endpoint) {
 // NOTE(yuyang18) : This test is buggy.
 // 1. We should not use port 8889 before check.
 // 2. We should not use sleep(2) to sync threads.
-TEST(PREFETCH, DISABLE_CPU) {
+TEST(PREFETCH, DISABLED_CPU) {
   // start up a server instance backend
   std::thread server_thread(StartServer, "127.0.0.1:8889");
   sleep(2);

paddle/fluid/operators/test_send_nccl_id.cc

@@ -63,7 +63,7 @@ void StartServer(std::atomic<bool>* initialized) {
   server_thread.join();
 }
 
-TEST(SendNcclId, Normal) {
+TEST(SendNcclId, DISABLED_Normal) {
   std::atomic<bool> initialized{false};
   std::thread server_thread(StartServer, &initialized);
   while (!initialized) {