diff --git a/runtime/src/listener_thread.c b/runtime/src/listener_thread.c
index 90a7929b..d12c90d8 100644
--- a/runtime/src/listener_thread.c
+++ b/runtime/src/listener_thread.c
@@ -14,6 +14,8 @@
 #include "http_session_perf_log.h"
 
 extern thread_local int thread_id;
+extern bool first_request_comming;
+time_t t_start;
 extern void http_session_copy(struct http_session *dest, struct http_session *source);
 /////////////////xiaosu for test//////////////////
 struct http_session *g_session = NULL;
@@ -208,6 +210,11 @@ on_client_request_arrival(int client_socket, const struct sockaddr *client_addre
 static void
 on_client_request_receiving(struct http_session *session)
 {
+	if (first_request_comming == false){
+		t_start = time(NULL);
+		first_request_comming = true;
+	}
+
 	/* Read HTTP request */
 	int rc = http_session_receive_request(session, (void_star_cb)listener_thread_register_http_session);
 	if (likely(rc == 0)) {
diff --git a/runtime/src/main.c b/runtime/src/main.c
index ab8712b6..a0e46be2 100644
--- a/runtime/src/main.c
+++ b/runtime/src/main.c
@@ -35,7 +35,7 @@ uint32_t runtime_first_worker_processor  = 1;
 uint32_t runtime_processor_speed_MHz     = 0;
 uint32_t runtime_total_online_processors = 0;
 uint32_t runtime_worker_threads_count    = 0;
-time_t t_start;
+bool first_request_comming = false;
 thread_local int thread_id = -1;
 
 enum RUNTIME_SIGALRM_HANDLER runtime_sigalrm_handler = RUNTIME_SIGALRM_HANDLER_BROADCAST;
@@ -69,18 +69,23 @@ runtime_allocate_available_cores()
 
 	pretty_print_key_value("Core Count (Online)", "%u\n", runtime_total_online_processors);
 
-	/* If more than two cores are available, leave core 0 free to run OS tasks */
-	if (runtime_total_online_processors > 2) {
-		runtime_first_worker_processor = 2;
-		max_possible_workers           = runtime_total_online_processors - 2;
-	} else if (runtime_total_online_processors == 2) {
-		runtime_first_worker_processor = 1;
-		max_possible_workers           = runtime_total_online_processors - 1;
+	char* first_core_id = getenv("SLEDGE_FIRST_COREID");	
+
+	if (first_core_id != NULL) {
+		runtime_first_worker_processor = atoi(first_core_id);
 	} else {
-		panic("Runtime requires at least two cores!");
+		/* If more than two cores are available, leave core 0 free to run OS tasks */
+		if (runtime_total_online_processors > 2) {
+			runtime_first_worker_processor = 2;
+			max_possible_workers           = runtime_total_online_processors - 2;
+		} else if (runtime_total_online_processors == 2) {
+			runtime_first_worker_processor = 1;
+			max_possible_workers           = runtime_total_online_processors - 1;
+		} else {
+			panic("Runtime requires at least two cores!");
+		}
 	}
 
-
 	/* Number of Workers */
 	char *worker_count_raw = getenv("SLEDGE_NWORKERS");
 	if (worker_count_raw != NULL) {
@@ -520,7 +525,7 @@ main(int argc, char **argv)
 	}
 
 	runtime_boot_timestamp = __getcycles();
-	t_start = time(NULL);
+	//t_start = time(NULL);
 
 	for (int tenant_idx = 0; tenant_idx < tenant_config_vec_len; tenant_idx++) {
 		tenant_config_deinit(&tenant_config_vec[tenant_idx]);