官方压测工具mysqlslap介绍及使用

MySQLslap是官方的一款做压力测试的工具，可以模拟多个客户端进行并发测试。
比如可以模拟多少并发，执行多少次，针对某个存储引擎……等等

比如对myisam引擎做并发量为100，查询次数为1000
--concurrency用于指定并发量，--number-of-queries=1000用于指定查询次数，--engine用于指定存储引擎
-a则是自动生成SQL（当未提供file或command时）

[op@sAno1y ~]$ mysqlslap -a --concurrency=100 --number-of-queries=1000 --engine=myisam -uroot -proot
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: 0.167 seconds
Minimum number of seconds to run all queries: 0.167 seconds
Maximum number of seconds to run all queries: 0.167 seconds
Number of clients running queries: 100
Average number of queries per client: 10
Benchmark
Running for engine myisam
Average number of seconds to run all queries: 0.170 seconds
Minimum number of seconds to run all queries: 0.170 seconds
Maximum number of seconds to run all queries: 0.170 seconds
Number of clients running queries: 200
Average number of queries per client: 5

当然可以做迭代，在一次测试中输出：
其中--concurrency可以写作--concurrency=128,256,512诸如此类，而--engine也可以迭代写作--engine=innodb,myisam,memory等。
比如：
多加了的--debug-info参数可以使测试结果变得更加详尽。

[op@sAno1y ~]$ mysqlslap -a --concurrency=100,200 --iterations=1 --number-of-queries=1000 --engine=myisam,innodb,memory --debug-info -uroot -proot
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: 0.160 seconds
Minimum number of seconds to run all queries: 0.160 seconds
Maximum number of seconds to run all queries: 0.160 seconds
Number of clients running queries: 100
Average number of queries per client: 10
Benchmark
Running for engine myisam
Average number of seconds to run all queries: 0.164 seconds
Minimum number of seconds to run all queries: 0.164 seconds
Maximum number of seconds to run all queries: 0.164 seconds
Number of clients running queries: 200
Average number of queries per client: 5
Benchmark
Running for engine innodb
Average number of seconds to run all queries: 0.787 seconds
Minimum number of seconds to run all queries: 0.787 seconds
Maximum number of seconds to run all queries: 0.787 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: 1.154 seconds
Minimum number of seconds to run all queries: 1.154 seconds
Maximum number of seconds to run all queries: 1.154 seconds
Number of clients running queries: 200
Average number of queries per client: 5
Benchmark
Running for engine memory
Average number of seconds to run all queries: 0.140 seconds
Minimum number of seconds to run all queries: 0.140 seconds
Maximum number of seconds to run all queries: 0.140 seconds
Number of clients running queries: 100
Average number of queries per client: 10
Benchmark
Running for engine memory
Average number of seconds to run all queries: 0.159 seconds
Minimum number of seconds to run all queries: 0.159 seconds
Maximum number of seconds to run all queries: 0.159 seconds
Number of clients running queries: 200
Average number of queries per client: 5
User time 0.23, System time 0.25
Maximum resident set size 12788, Integral resident set size 0
Non-physical pagefaults 11916, Physical pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals 0
Voluntary context switches 25055, Involuntary context switches 99

其中Average number of queries per client = number-of-queries / concurrency
即平均一个client的查询 = 总查询 ÷ 并发

另外--auto-general-sql-load-type这个参数也可以选填，默认为mixed。
其他可选项为：update、write、key、read。

附录：
mysqlslap option：

mysqlslap Ver 1.0 Distrib 5.6.26, for Linux (x86_64)
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Run a query multiple times against the server.
Usage: mysqlslap [OPTIONS]
Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /home/op/softwares/mysql/etc/my.cnf ~/.my.cnf
The following groups are read: mysqlslap client
The following options may be given as the first argument:
--print-defaults Print the program argument list and exit.
--no-defaults Don't read default options from any option file,
except for login file.
--defaults-file=# Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.
--defaults-group-suffix=#
Also read groups with concat(group, suffix)
--login-path=# Read this path from the login file.
-?, --help Display this help and exit.
-a, --auto-generate-sql
Generate SQL where not supplied by file or command line.
--auto-generate-sql-add-autoincrement
Add an AUTO_INCREMENT column to auto-generated tables.
--auto-generate-sql-execute-number=#
Set this number to generate a set number of queries to
run.
--auto-generate-sql-guid-primary
Add GUID based primary keys to auto-generated tables.
--auto-generate-sql-load-type=name
Specify test load type: mixed, update, write, key, or
read; default is mixed.
--auto-generate-sql-secondary-indexes=#
Number of secondary indexes to add to auto-generated
tables.
--auto-generate-sql-unique-query-number=#
Number of unique queries to generate for automatic tests.
--auto-generate-sql-unique-write-number=#
Number of unique queries to generate for
auto-generate-sql-write-number.
--auto-generate-sql-write-number=#
Number of row inserts to perform for each thread (default
is 100).
--commit=# Commit records every X number of statements.
-C, --compress Use compression in server/client protocol.
-c, --concurrency=name
Number of clients to simulate for query to run.
--create=name File or string to use create tables.
--create-schema=name
Schema to run tests in.
--csv[=name] Generate CSV output to named file or to stdout if no file
is named.
-#, --debug[=#] This is a non-debug version. Catch this and exit.
--debug-check Check memory and open file usage at exit.
-T, --debug-info Print some debug info at exit.
--default-auth=name Default authentication client-side plugin to use.
-F, --delimiter=name
Delimiter to use in SQL statements supplied in file or
command line.
--detach=# Detach (close and reopen) connections after X number of
requests.
--enable-cleartext-plugin
Enable/disable the clear text authentication plugin.
-e, --engine=name Storage engine to use for creating the table.
-h, --host=name Connect to host.
-i, --iterations=# Number of times to run the tests.
--no-drop Do not drop the schema after the test.
-x, --number-char-cols=name
Number of VARCHAR columns to create in table if
specifying --auto-generate-sql.
-y, --number-int-cols=name
Number of INT columns to create in table if specifying
--auto-generate-sql.
--number-of-queries=#
Limit each client to this number of queries (this is not
exact).
--only-print Do not connect to the databases, but instead print out
what would have been done.
-p, --password[=name]
Password to use when connecting to server. If password is
not given it's asked from the tty.
--plugin-dir=name Directory for client-side plugins.
-P, --port=# Port number to use for connection.
--post-query=name Query to run or file containing query to execute after
tests have completed.
--post-system=name system() string to execute after tests have completed.
--pre-query=name Query to run or file containing query to execute before
running tests.
--pre-system=name system() string to execute before running tests.
--protocol=name The protocol to use for connection (tcp, socket, pipe,
memory).
-q, --query=name Query to run or file containing query to run.
--secure-auth Refuse client connecting to server if it uses old
(pre-4.1.1) protocol.
(Defaults to on; use --skip-secure-auth to disable.)
-s, --silent Run program in silent mode - no output.
-S, --socket=name The socket file to use for connection.
--ssl Enable SSL for connection (automatically enabled with
other flags).
--ssl-ca=name CA file in PEM format (check OpenSSL docs, implies
--ssl).
--ssl-capath=name CA directory (check OpenSSL docs, implies --ssl).
--ssl-cert=name X509 cert in PEM format (implies --ssl).
--ssl-cipher=name SSL cipher to use (implies --ssl).
--ssl-key=name X509 key in PEM format (implies --ssl).
--ssl-crl=name Certificate revocation list (implies --ssl).
--ssl-crlpath=name Certificate revocation list path (implies --ssl).
--ssl-verify-server-cert
Verify server's "Common Name" in its cert against
hostname used when connecting. This option is disabled by
default.
-u, --user=name User for login if not current user.
-v, --verbose More verbose output; you can use this multiple times to
get even more verbose output.
-V, --version Output version information and exit.

mysqlslap的缺点还是挺明显的，比如，不可以设置持续时间，比如24小时，表的数目不能指定等。
其最明显的优点是可以对不同的存储引擎做出对比。

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