多块连续内存
仅仅用于静态不变内容
bucket size 需要考虑CPU对齐问题
O1的复杂度,非常快
![image-20190219101337598](/Users/xhxu/Library/Application Support/typora-user-images/image-20190219101337598.png)
遍历复杂度为O(n)
左子节点小于右子节点
ngx_conf_module ngx_event_timer_rbtree ngx_http_file_cache ngx_http_geo_module ngx_http_limit_conn_module ngx_http_limit_req_module ngx_http_lua_shdict:ngx.shared.DICT resolver ngx_resolver_t ngx_stream_geo_module ngx_stream_limit_conn_module