wangbo commented on issue #5509: URL: https://github.com/apache/incubator-doris/issues/5509#issuecomment-797394279
你可以加一个profile的指标看下 即使在命中rollup的情况,在基数比较高时,目前bitmap的主要计算开销在bitmap列的反序列化与基数计算上 还有一部分开销在内存池的分配和释放上 对于普通用户来说,目前bitmap比较快速的的优化方式如下 1 增加并发度,包括单机的查询并发以及增加更多be节点 2 优化输入数据的分布。bitmap当保存的数据比较连续且数据较小时,存储空间和查询性能较好,这个只能用户自己对输入的数据再做一层编码的映射 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org