用mysqlslap进行mysql压力测试
转载地址：http://my.oschina.net/javagg/blog/5060

mysqlslap是一个mysql官方提供的压力测试工具,通过模拟多个并发客户端访问mysql来执行测试，使用起来非常的简单。通过mysqlslap help可以获得可用的选项。
下面我们就来看看一些比较重要的参数：

defaults-file，配置文件存放位置create-schema，测试的schema，MySQL中schema也就是databaseconcurrency，并发数engines，测试引擎，可以有多个，用分隔符隔开。iterations，迭代的实验次数socket，socket，文件位置debug-info，打印内存和CPU的信息only-print，只打印测试语句而不实际执行auto-generate-sql，自动产生测试SQLauto-generate-sql-load-type，测试SQL的类型。类型有mixed，update，write，key，read。number-of-queries，执行的SQL总数量number-int-cols，表内int列的数量number-char-cols，表内char列的数量query=name，使用自定义脚本执行测试，例如可以调用自定义的一个存储过程或者sql语句来执行测试。

测试例子如下：

[root@localhost ~]# /usr/local/mysql/bin/mysqlslap  defaults-file=/etc/my.cnf concurrency=200 iterations=1 number-int-cols=1 auto-generate-sql auto-generate-sql-load-type=write engine=myisam,innodb number-of-queries=200 -S/tmp/mysql.sock debug-info  -uroot -p123Benchmark        Running for engine myisam        Average number of seconds to run all queries: 0.087 seconds        Minimum number of seconds to run all queries: 0.087 seconds        Maximum number of seconds to run all queries: 0.087 seconds        Number of clients running queries: 200        Average number of queries per client: 1Benchmark        Running for engine innodb        Average number of seconds to run all queries: 0.551 seconds        Minimum number of seconds to run all queries: 0.551 seconds        Maximum number of seconds to run all queries: 0.551 seconds        Number of clients running queries: 200        Average number of queries per client: 1User time 0.03, System time 0.05Maximum resident set size 0, Integral resident set size 0Non-physical pagefaults 2826, Physical pagefaults 0, Swaps 0Blocks in 0 out 0, Messages in 0 out 0, Signals 0Voluntary context switches 3340, Involuntary context switches 96

对于INNODB引擎，200个客户端同时运行这些SQL语句平均要花0.551秒。相应的MYISAM为0.087秒，测试结果也很简明，就不多少说了。
指定数据库的测试：

create-schema，指定数据库名称query，     指定SQL语句，可以定位到某个包含SQL的文件[root@localhost ~]# /usr/local/mysql/bin/mysqlslap defaults-file=/etc/my.cnf concurrency=50 iterations=1 create-schema=test query=/root/test.sql -S/tmp/mysql.sock -uroot -p123Benchmark        Average number of seconds to run all queries: 0.021 seconds        Minimum number of seconds to run all queries: 0.021 seconds        Maximum number of seconds to run all queries: 0.021 seconds        Number of clients running queries: 50        Average number of queries per client: 1