进行mysql压力测试需要注意的几点_MySQL
1、填充测试数据比物理内存还要大，至少超过innodb_buffer_pool_size 值，不能将数据全部装载到内存中，除非你的本意就想测试全内存状态下的MySQL性能。
2、每轮测试完成后，都重启mysqld实例，并且用下面的方法删除系统cache，释放swap（如果用到了swap的话），甚至可以重启整个OS。
[root@imysql.com]# sync -- 将脏数据刷新到磁盘
[root@imysql.com]# echo 3 >/proc/sys/vm/drop_caches -- 清除OS Cache
[root@imysql.com]# swapoff -a &&swapon –a
3、压测结果除了tps/TpmC指标外，还应该关注压测期间的系统负载数据，尤其是 iops、iowait、svctm、%util、每秒I/O字节数(I/O吞吐)、事务响应时间(tpcc-mysql/sysbench 打印的测试记录中均有)。另外，如果I/O设备能提供设备级 IOPS、读写延时 数据的话，也应该一并关注。
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