mysqlslap执行基准测试的代码详情介绍

-a, --auto-generate-sql 由系统自动生成SQL脚本进行测试
                      Generate SQL where not supplied by file or command line.
  --auto-generate-sql-add-autoincrement 生成的表中增加自增的ID
                      Add an AUTO_INCREMENT column to auto-generated tables.--auto-generate-sql-load-type=name 制定测试过程中使用的查询类型
                      Specify test load type: mixed, update, write, key, or
                      read; default is mixed.--auto-generate-sql-write-number=# 制定所生成的初始化数据的条数
                      Number of row inserts to perform for each thread (default
                      is 100).-c, --concurrency=name 制定并发线程的数量
                      Number of clients to simulate for query to run.
  --create=name       File or string to use create tables.
  --create-schema=name 创建一个测试数据库的schema名称
                      Schema to run tests in.-T, --debug-info    This is a non-debug version. Catch this and exit.指定输出额外的内存及CPU统计信息-e,
                       --engine=name   Storage engine to use for creating the table. 指定所测试的存储引擎，用逗号可以分割以便测试多个引擎
  -h, --host=name     Connect to host. 链接远程主机的IP
  -i, --iterations=#  Number of times to run the tests. 指定本次测试需要运行的次数
  --no-drop           Do not drop the schema after the test. 指定测试完成后，不清理过程数据
  -x, --number-char-cols=name 指定测试表中生成的varchar类型的数据数量
                      Number of VARCHAR columns to create in table if
                      specifying --auto-generate-sql.
  -y, --number-int-cols=name 指定测试表中生成的int类型的数据数量
                      Number of INT columns to create in table if specifying
                      --auto-generate-sql.
  --number-of-queries=# 指定每一个线程所执行的查询数量
                      Limit each client to this number of queries (this is not
                      exact).
  --only-print        Do not connect to the databases, but instead print out 并不运行测试脚本，而是把生成的脚本打印出来
                      what would have been done.
  -p, --password[=name] 指定测试所用的链接数据库的密码
                      Password to use when connecting to server. If password is
                      not given it's asked from the tty.-q, --query=name    Query to run or file containing query to run.自定义测试用的sql
  -u, --user=name     User for login if not current user. 指定测试所用的链接数据库的用户名

其中，完整的运行脚本如下

mysqlslap -S /tmp/mysql3306.sock --concurrency=1,50,100,200 --iterations=3 --number-int-cols=5 --number-char-cols=5 
--auto-generate-sql --auto-generate-sql-add-autoincrement --engine=innodb --number-of-queries=10
 --create-schema=test -uroot -p

待输入密码后，测试信息如下

Enter password: 
Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 0.097 seconds
        Minimum number of seconds to run all queries: 0.093 seconds
        Maximum number of seconds to run all queries: 0.107 seconds
        Number of clients running queries: 1
        Average number of queries per client: 10Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 0.506 seconds
        Minimum number of seconds to run all queries: 0.447 seconds
        Maximum number of seconds to run all queries: 0.570 seconds
        Number of clients running queries: 50
        Average number of queries per client: 0Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 2.204 seconds
        Minimum number of seconds to run all queries: 1.595 seconds
        Maximum number of seconds to run all queries: 3.257 seconds
        Number of clients running queries: 100
        Average number of queries per client: 0mysqlslap: Error when connecting to server: 1040 Too many connections
mysqlslap: Error when connecting to server: 1040 Too many connections
mysqlslap: Error when connecting to server: 1040 Too many connections
mysqlslap: Error when connecting to server: 1040 Too many connections

此时可以看出来，当并发达到了200的时候，出现了Too many connections的异常，这是因为mysql默认配置的最大链接数为100，故需要对my.cnf做如下的修改

添加max_connections=1024，之后运行正常

Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 0.093 seconds
        Minimum number of seconds to run all queries: 0.087 seconds
        Maximum number of seconds to run all queries: 0.098 seconds
        Number of clients running queries: 1
        Average number of queries per client: 10Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 0.514 seconds
        Minimum number of seconds to run all queries: 0.462 seconds
        Maximum number of seconds to run all queries: 0.545 seconds
        Number of clients running queries: 50
        Average number of queries per client: 0Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 1.209 seconds
        Minimum number of seconds to run all queries: 1.173 seconds
        Maximum number of seconds to run all queries: 1.241 seconds
        Number of clients running queries: 100
        Average number of queries per client: 0Benchmark
        Running for engine innodb
        Average number of seconds to run all queries: 2.174 seconds
        Minimum number of seconds to run all queries: 1.978 seconds
        Maximum number of seconds to run all queries: 2.402 seconds
        Number of clients running queries: 200
        Average number of queries per client: 0

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