主从同步性能优化，主从同步性能测试。

kvs_hash_bin.c

@@ -273,7 +273,9 @@ int kvs_hash_save(iouring_ctx_t *uring, kvs_hash_t *inst, const char* filename){
 	for(int i = 0;i < inst->max_slots; ++ i){
 		for (hashnode_t *n = inst->nodes[i]; n != NULL; n = n->next) {
 			if (!n->key || n->key_len == 0) continue;
- 			if (n->value_len > 0 && !n->value) { close(fd); return -3; }
+ 			if (n->value_len > 0 && !n->value) { 
+				goto clean; 
+			}
 		
 
 			uint32_t klen = htonl((uint32_t)n->key_len);
@@ -308,14 +310,21 @@ int kvs_hash_save(iouring_ctx_t *uring, kvs_hash_t *inst, const char* filename){
 
 
 			task_t *t = submit_write(uring, fd, bufs, lens, count, current_off);
-
-			if (!t) { close(fd); return -4; }
-
+			if(!t) {
+				perror("task init failed");
+				goto clean;
+			}
+			cleanup_finished_iouring_tasks();
 			
 			current_off += (off_t) total;
 		}
 	}
 
+clean:
+	while (!uring_task_complete(uring)) {
+		usleep(1000);
+		cleanup_finished_iouring_tasks();
+	}
 	close(fd);
 	return 0;
 }