MySQL从5.1.4版开始带有一个压力测试工具mysqlslap，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，这里列一些主要的参数，更详细的说明参考官方手册。
–auto-generate-sql,
-a
自动生成测试表和数据
--auto-generate-sql-write-number–auto-generate-sql-guid-primary
每个线程中产生多少个insert
创建的测试表额外增加一个主键，与–auto-generate-sql-add-autoincrement冲突
–auto-generate-sql-load-type=type
测试语句的类型。取值包
括：read，key，write，update和mixed(默认)。
–number-char-cols=N, -x N
自动生成的测试表中包含多少个字符类型的列，默认1
–number-int-cols=N, -y N
自动生成的测试表中包含多少个数字类型的列，默认1
–number-of-queries=N
总的测试查询次数
–query=name,-q
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。
–create-schema
测试的schema，MySQL中schema也就是database
–commint=N
多少条DML后提交一次
–compress, -C
如果服务器和客户端支持都压缩，则压缩信息传递
–concurrency=N, -c N
并发量，也就是模拟多少个客户端同时执行select。可指定多个值，以逗号或者
–delimiter参数指定的值做为分隔符
–engine=engine_name, -e engine_name
创建测试表所使用的存储引擎，可指定多个
–iterations=N, -i N
测试执行的迭代次数
–detach=N
执行N条语句后断开重连
–debug-info, -T
打印内存和CPU的信息
–only-print
只打印测试语句而不实际执行
测试的过程需要生成测试表，插入测试数据，这个mysqlslap可以自动生成，默认生成一个mysqlslap的schema，如果已经存在则先 删除，这里要注意了，不要用–create-schema指定已经存在的库，否则后果可能很严重。可以用–only-print来打印实际的测试过程：
$mysqlslap -a --only-print
DROP SCHEMA IF EXISTS `mysqlslap`;
CREATE
SCHEMA `mysqlslap`;
use mysqlslap;
CREATE TABLE `t1` (intcol1
INT(32) ,charcol1 VARCHAR(128));
INSERT INTO t1 VALUES
(1804289383,'hfhjg');
...
SELECT intcol1,charcol1 FROM t1;
INSERT
INTO t1 VALUES (364531492,'jghjgjh');
DROP SCHEMA IF EXISTS
`mysqlslap`;
可以看到最后由删除一开始创建的schema的动作，整个测试完成后不会在数据库中留下痕迹。假如我们执行一次测试，分
别50和100个并发，执行1000次总查询，那么：
$mysqlslap -a --concurrency=50,100 --number-of-queries 1000
--debug-info
Benchmark
Average number of seconds to run all
queries: 0.375 seconds
Minimum number of seconds to run all queries:
0.375 seconds
Maximum number of seconds to run all queries: 0.375
seconds
Number of clients running queries: 50
Average number of
queries per client: 20
Benchmark
Average number of seconds to run all queries: 0.453
seconds
Minimum number of seconds to run all queries: 0.453 seconds
Maximum
number of seconds to run all queries: 0.453 seconds
Number of
clients running queries: 100
Average number of queries per client: 10
User time 0.29, System time 0.11
Maximum resident set size 0,
Integral resident set size 0
Non-physical pagefaults 4032, Physical
pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals
0
Voluntary context switches 7319, Involuntary context switches 681
上
结果可以看出，50和100个并发分别得到一次测试结果(Benchmark)，并发数越多，执行完所有查询的时间越长。为了准确起见，可以多迭代测试几
次:
$ mysqlslap -a --concurrency=50,100 --number-of-queries 1000
--iterations=5 --debug-info
Benchmark
Average number of seconds
to run all queries: 0.380 seconds
Minimum number of seconds to run
all queries: 0.377 seconds
Maximum number of seconds to run all
queries: 0.385 seconds
Number of clients running queries: 50
Average
number of queries per client: 20
Benchmark
Average number of seconds to run all queries: 0.447
seconds
Minimum number of seconds to run all queries: 0.444 seconds
Maximum
number of seconds to run all queries: 0.451 seconds
Number of
clients running queries: 100
Average number of queries per client: 10
User time 1.44, System time 0.67
Maximum resident set size 0,
Integral resident set size 0
Non-physical pagefaults 17922, Physical
pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals
0
Voluntary context switches 36796, Involuntary context switches
4093
测试同时不同的存储引擎的性能进行对比：
$ mysqlslap -a --concurrency=50,100 --number-of-queries 1000
--iterations=5 --engine=myisam,innodbmysqlslap -a --concurrency=50,100
--number-of-queries 1000 --iterations=5 --engine=myisam,innodb
--debug-info
Benchmark
Running for engine myisam
Average number
of seconds to run all queries: 0.200 seconds
Minimum number of
seconds to run all queries: 0.188 seconds
Maximum number of seconds
to run all queries: 0.210 seconds
Number of clients running queries:
50
Average number of queries per client: 20
Benchmark
Running for engine myisam
Average number of seconds
to run all queries: 0.238 seconds
Minimum number of seconds to run
all queries: 0.228 seconds
Maximum number of seconds to run all
queries: 0.251 seconds
Number of clients running queries: 100
Average
number of queries per client: 10
Benchmark
Running for engine innodb
Average number of seconds
to run all queries: 0.375 seconds
Minimum number of seconds to run
all queries: 0.370 seconds
Maximum number of seconds to run all
queries: 0.379 seconds
Number of clients running queries: 50
Average
number of queries per client: 20
Benchmark
Running for engine innodb
Average number of seconds
to run all queries: 0.443 seconds
Minimum number of seconds to run
all queries: 0.440 seconds
Maximum number of seconds to run all
queries: 0.447 seconds
Number of clients running queries: 100
Average
number of queries per client: 10
User time 2.83, System time 1.66
Maximum resident set size 0,
Integral resident set size 0
Non-physical pagefaults 34692, Physical
pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals
0
Voluntary context switches 87306, Involuntary context switches
10326