MySQL5.1自带了一个压力测试工具mysqlslap.
关于它的选项手册上介绍的很详细，–help也可看到。
我解释一下一些常用的选项。
这里要注意的几个选项：

--concurrency代表并发数量，多个可以用逗号隔开，当然你也可以用自己的分隔符隔开，这个时候要用到--delimiter开关。
--engines代表要测试的引擎，可以有多个，用分隔符隔开。
--iterations代表要运行这些测试多少次。
--auto-generate-sql 代表用系统自己生成的SQL脚本来测试。
--auto-generate-sql-load-type 代表要测试的是读还是写还是两者混合的（read,write,update,mixed）
--number-of-queries 代表总共要运行多少次查询。每个客户运行的查询数量可以用查询总数/并发数来计算。比如倒数第二个结果2=200/100。
--debug-info 代表要额外输出CPU以及内存的相关信息。
--number-int-cols 代表示例表中的INTEGER类型的属性有几个。
--number-char-cols 意思同上。
--create-schema 代表自己定义的模式（在MySQL中也就是库）。
--query 代表自己的SQL脚本。
--only-print 如果只想打印看看SQL语句是什么，可以用这个选项。

现在来看一些测试的例子。

1、用自带的SQL脚本来测试。
MySQL版本为5.1.34

[root@CentOS ~]# mysqlslap --defaults-file=/etc/my.cnf --concurrency=50,100,200 --iterations=1 --number-int-cols=4 --number-char-cols=35 --auto-generate-sql --auto-generate-sql-add-autoincrement --auto-generate-sql-load-type=mixed --engine=myisam,innodb --number-of-queries=200 --debug-info -uroot -p123456 -S/tmp/mysql.sock
Benchmark
        Running for engine myisam
        Average number of seconds to run all queries: 0.147 seconds
        Minimum number of seconds to run all queries: 0.147 seconds
        Maximum number of seconds to run all queries: 0.147 seconds
        Number of clients running queries: 50
        Average number of queries per client: 4

Benchmark
        Running for engine myisam
        Average number of seconds to run all queries: 0.201 seconds
        Minimum number of seconds to run all queries: 0.201 seconds
        Maximum number of seconds to run all queries: 0.201 seconds
        Number of clients running queries: 100
        Average number of queries per client: 2

Benchmark
        Running for engine myisam
        Average number of seconds to run all queries: 0.272 seconds
        Minimum number of seconds to run all queries: 0.272 seconds
        Maximum number of seconds to run all queries: 0.272 seconds
        Number of clients running queries: 200
        Average number of queries per client: 1

Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 0.349 seconds
        Minimum number of seconds to run all queries: 0.349 seconds
        Maximum number of seconds to run all queries: 0.349 seconds
        Number of clients running queries: 50
        Average number of queries per client: 4

Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 0.397 seconds
        Minimum number of seconds to run all queries: 0.397 seconds
        Maximum number of seconds to run all queries: 0.397 seconds
        Number of clients running queries: 100
        Average number of queries per client: 2

Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 0.618 seconds
        Minimum number of seconds to run all queries: 0.618 seconds
        Maximum number of seconds to run all queries: 0.618 seconds
        Number of clients running queries: 200
        Average number of queries per client: 1

User time 0.04, System time 1.20
Maximum resident set size 0, Integral resident set size 0
Non-physical pagefaults 4602, Physical pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals 0
Voluntary context switches 2785, Involuntary context switches 7146