Pre-assigned the server port and added more logs

test/cpp/qps/json_run_localhost.cc

@@ -88,12 +88,16 @@ int main(int argc, char** argv) {
   bool first = true;
 
   for (int i = 0; i < kNumWorkers; i++) {
-    const auto port = grpc_pick_unused_port_or_die();
+    const auto driver_port = grpc_pick_unused_port_or_die();
+    // ServerPort can be used or not later depending on the type of worker
+    // but we like to issue all ports required here to avoid port conflict.
+    const auto server_port = grpc_pick_unused_port_or_die();
     std::vector<std::string> args = {bin_dir + "/qps_worker", "-driver_port",
-                                     as_string(port)};
+                                     as_string(driver_port), "-server_port",
+                                     as_string(server_port)};
     g_workers[i] = new SubProcess(args);
     if (!first) env << ",";
-    env << "localhost:" << port;
+    env << "localhost:" << driver_port;
     first = false;
   }
 

test/cpp/qps/qps_worker.cc

@@ -280,6 +280,7 @@ QpsWorker::QpsWorker(int driver_port, int server_port,
   gpr_atm_rel_store(&done_, static_cast<gpr_atm>(0));
 
   std::unique_ptr<ServerBuilder> builder = CreateQpsServerBuilder();
+  builder->AddChannelArgument(GRPC_ARG_ALLOW_REUSEPORT, 0);
   if (driver_port >= 0) {
     std::string server_address = grpc_core::JoinHostPort("::", driver_port);
     builder->AddListeningPort(
@@ -291,11 +292,10 @@ QpsWorker::QpsWorker(int driver_port, int server_port,
   server_ = builder->BuildAndStart();
   if (server_ == nullptr) {
     gpr_log(GPR_ERROR,
-            "QpsWorker: Fail to BuildAndStart(driver_port=%d, server_port=%d)",
+            "QpsWorker: Fail to BuildAndStart(port=%d) (server_port=%d)",
             driver_port, server_port);
   } else {
-    gpr_log(GPR_INFO,
-            "QpsWorker: BuildAndStart(driver_port=%d, server_port=%d) done",
+    gpr_log(GPR_INFO, "QpsWorker: BuildAndStart(port=%d) (server_port=%d)",
             driver_port, server_port);
   }
 }

test/cpp/qps/server_async.cc

@@ -82,7 +82,8 @@ class AsyncQpsServerTest final : public grpc::testing::Server {
     if (port_num >= 0) {
       std::string server_address = grpc_core::JoinHostPort("::", port_num);
       builder->AddListeningPort(server_address.c_str(),
-                                Server::CreateServerCredentials(config));
+                                Server::CreateServerCredentials(config),
+                                &port_num);
     }
 
     register_service(builder.get(), &async_service_);
@@ -105,6 +106,11 @@ class AsyncQpsServerTest final : public grpc::testing::Server {
     ApplyConfigToBuilder(config, builder.get());
 
     server_ = builder->BuildAndStart();
+    if (server_ == nullptr) {
+      gpr_log(GPR_ERROR, "Server: Fail to BuildAndStart(port=%d)", port_num);
+    } else {
+      gpr_log(GPR_INFO, "Server: BuildAndStart(port=%d)", port_num);
+    }
 
     auto process_rpc_bound =
         std::bind(process_rpc, config.payload_config(), std::placeholders::_1,

test/cpp/qps/server_callback.cc

@@ -104,7 +104,8 @@ class CallbackServer final : public grpc::testing::Server {
     if (port_num >= 0) {
       std::string server_address = grpc_core::JoinHostPort("::", port_num);
       builder->AddListeningPort(server_address.c_str(),
-                                Server::CreateServerCredentials(config));
+                                Server::CreateServerCredentials(config),
+                                &port_num);
     }
 
     ApplyConfigToBuilder(config, builder.get());
@@ -112,6 +113,11 @@ class CallbackServer final : public grpc::testing::Server {
     builder->RegisterService(&service_);
 
     impl_ = builder->BuildAndStart();
+    if (impl_ == nullptr) {
+      gpr_log(GPR_ERROR, "Server: Fail to BuildAndStart(port=%d)", port_num);
+    } else {
+      gpr_log(GPR_INFO, "Server: BuildAndStart(port=%d)", port_num);
+    }
   }
 
   std::shared_ptr<Channel> InProcessChannel(

test/cpp/qps/server_sync.cc

@@ -162,7 +162,8 @@ class SynchronousServer final : public grpc::testing::Server {
     if (port_num >= 0) {
       std::string server_address = grpc_core::JoinHostPort("::", port_num);
       builder->AddListeningPort(server_address.c_str(),
-                                Server::CreateServerCredentials(config));
+                                Server::CreateServerCredentials(config),
+                                &port_num);
     }
 
     ApplyConfigToBuilder(config, builder.get());
@@ -170,6 +171,11 @@ class SynchronousServer final : public grpc::testing::Server {
     builder->RegisterService(&service_);
 
     impl_ = builder->BuildAndStart();
+    if (impl_ == nullptr) {
+      gpr_log(GPR_ERROR, "Server: Fail to BuildAndStart(port=%d)", port_num);
+    } else {
+      gpr_log(GPR_INFO, "Server: BuildAndStart(port=%d)", port_num);
+    }
   }
 
   std::shared_ptr<Channel> InProcessChannel(