use logical cpu cores as the default pool size of grpc async client pool (#10143)

ref #6233

Signed-off-by: xufei <[email protected]>

Author: windtalker

dbms/src/Common/getNumberOfCPUCores.cpp

@@ -20,7 +20,8 @@
 namespace CPUCores
 {
 UInt16 number_of_logical_cpu_cores = std::thread::hardware_concurrency();
-UInt16 number_of_physical_cpu_cores = std::thread::hardware_concurrency() / 2;
+// physical cpu cores should not be 0
+UInt16 number_of_physical_cpu_cores = std::max<UInt16>(1, std::thread::hardware_concurrency() / 2);
 } // namespace CPUCores
 
 

dbms/src/Server/Server.cpp

@@ -1220,7 +1220,7 @@ try
         {
             auto size = settings.grpc_completion_queue_pool_size;
             if (size == 0)
-                size = std::thread::hardware_concurrency();
+                size = getNumberOfLogicalCPUCores();
             GRPCCompletionQueuePool::global_instance = std::make_unique<GRPCCompletionQueuePool>(size);
         }