diff --git a/src/benchTmq.c b/src/benchTmq.c
index 861f2c8d..c92c6f9e 100644
--- a/src/benchTmq.c
+++ b/src/benchTmq.c
@@ -96,7 +96,7 @@ static tmq_list_t * buildTopicList() {
 }
 
 static int32_t data_msg_process(TAOS_RES* msg, tmqThreadInfo* pInfo, int32_t msgIndex) {
-  char* buf = (char*)calloc(1, 16*1024);
+  char* buf = (char*)calloc(1, 64*1024+8);
   if (NULL == buf) {
       errorPrint("consumer id %d calloc memory fail.\n", pInfo->id);
       return 0;
@@ -201,6 +201,7 @@ static void* tmqConsume(void* arg) {
 	// "sequential" or "parallel"
 	if (0 != strncasecmp(pConsumerInfo->createMode, "sequential", 10)) {			
 
+        char* tPtr = pConsumerInfo->groupId;
 	    // "share" or "independent"
 		char groupId[16] = {0};
 	    if (0 != strncasecmp(pConsumerInfo->groupMode, "share", 5)) {
@@ -210,11 +211,15 @@ static void* tmqConsume(void* arg) {
 				memset(groupId, 0, sizeof(groupId));
 				rand_string(groupId, sizeof(groupId) - 1, 0);
 				infoPrint("consumer id: %d generate rand group id: %s\n", pThreadInfo->id, groupId);
-			    //pConsumerInfo->groupId = groupId;
+			    tPtr = groupId;
 			}
 	    }
 
-		buildConsumerAndSubscribe(pThreadInfo, groupId);
+		int ret = buildConsumerAndSubscribe(pThreadInfo, tPtr);
+        if (0 != ret) {
+            infoPrint("%s\n", "buildConsumerAndSubscribe() fail in tmqConsume()");
+            return NULL;
+        }
 	}	
 
     int64_t totalMsgs = 0;
@@ -342,7 +347,12 @@ int subscribeTestProcess() {
 
         // "sequential" or "parallel"
 		if (0 == strncasecmp(pConsumerInfo->createMode, "sequential", 10)) {			
-            buildConsumerAndSubscribe(pThreadInfo, pConsumerInfo->groupId);
+            int retVal = buildConsumerAndSubscribe(pThreadInfo, pConsumerInfo->groupId);
+            if (0 != retVal) {
+                infoPrint("%s\n", "buildConsumerAndSubscribe() fail!");
+                ret = -1;
+                goto tmq_over;
+            }
 		}
         pthread_create(pids + i, NULL, tmqConsume, pThreadInfo);
     }