压测：mysqlslap

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。

-a, --auto-generate-sql
自动生成测试表和数据
--auto-generate-sql-load-type=name
测试语句的类型。取值包括：read，key，write，update和mixed(默认)
-x, --number-char-cols=N
自动生成的测试表中包含多少个字符类型的列，默认1 
-y, --number-int-cols=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(并发客户数×每客户查询次数)
-q, --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
--create-schema=name
测试的schema，MySQL中schema也就是database，默认生成一个mysqlslap
--commit=N
多少条DML后提交一次
-C, --compress
如果服务器和客户端支持都压缩，则压缩信息传递
-c, --concurrency=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
-e, --engine=name
创建测试表所使用的存储引擎，可指定多个
-i, --iterations=N
测试执行的迭代次数
--detach=N
执行N条语句后断开重连
-T, --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

打印测试语句

[root@VMUest ~]# 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,'mxvtvmC9127qJNm06sGB8R92q2j7vTiiITRDGXM9ZLzkdekbWtmXKwZ2qG1llkRw5m9DHOFilEREk3q7oce8O3BEJC0woJsm6uzFAEynLH2xCsw1KQ1lT4zg9rdxBL');
...
SELECT intcol1,charcol1 FROM t1;
INSERT INTO t1 VALUES (364531492,'qMa5SuKo4M5OM7ldvisSc6WK9rsG9E8sSixocHdgfa5uiiNTGFxkDJ4EAwWC2e4NL1BpAgWiFRcp1zIH6F1BayPdmwphatwnmzdwgzWnQ6SRxmcvtd6JRYwEKdvuWr');
DROP SCHEMA IF EXISTS `mysqlslap`;

分别50和100个并发，执行 1000次总查询，迭代5次，不同的存储引擎

[root@VMUest ~]# mysqlslap -a -h192.168.85.129 -umydba -pmysql5635 -P3306 --concurrency=50,100 --number-of-queries 1000 --iterations=5 --engine=myisam,innodb --debug-info
Warning: Using a password on the command line interface can be insecure.
Benchmark
        Running for engine myisam
        Average number of seconds to run all queries: 0.432 seconds
        Minimum number of seconds to run all queries: 0.382 seconds
        Maximum number of seconds to run all queries: 0.532 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: 0.512 seconds
        Minimum number of seconds to run all queries: 0.414 seconds
        Maximum number of seconds to run all queries: 0.710 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: 0.898 seconds
        Minimum number of seconds to run all queries: 0.606 seconds
        Maximum number of seconds to run all queries: 1.520 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: 0.744 seconds
        Minimum number of seconds to run all queries: 0.606 seconds
        Maximum number of seconds to run all queries: 0.954 seconds
        Number of clients running queries: 100
        Average number of queries per client: 10


User time 1.47, System time 2.65
Maximum resident set size 11060, Integral resident set size 0
Non-physical pagefaults 26225, Physical pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals 0
Voluntary context switches 40290, Involuntary context switches 5719

在sakila库上测试并发

[root@VMUest ~]# mysqlslap -h192.168.85.129 -umydba -pmysql5635 -P3306 --create-schema=sakila --query="select * from actor where actor_id=19" --concurrency=50 --number-of-queries 1000 --iterations=5