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. BenchmarkRunning for engine myisamAverage number of seconds to run all queries: 0.167 secondsMinimum number of seconds to run all queries: 0.167 secondsMaximum number of seconds to run all queries: 0.167 secondsNumber of clients running queries: 100Average number of queries per client: 10 BenchmarkRunning for engine myisamAverage number of seconds to run all queries: 0.170 secondsMinimum number of seconds to run all queries: 0.170 secondsMaximum number of seconds to run all queries: 0.170 secondsNumber of clients running queries: 200Average 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：
mysqlslapVer 1.0 Distrib 5.6.26, for Linux (x86_64) Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. 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.cnfThe following groups are read: mysqlslap client The following options may be given as the first argument: --print-defaultsPrint 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.-?, --helpDisplay 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 torun.--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, orread; default is mixed.--auto-generate-sql-secondary-indexes=# Number of secondary indexes to add to auto-generatedtables.--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 forauto-generate-sql-write-number.--auto-generate-sql-write-number=# Number of row inserts to perform for each thread (defaultis 100).--commit=#Commit records every X number of statements.-C, --compressUse 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 fileis named.-#, --debug[=#] This is a non-debug version. Catch this and exit.--debug-check Check memory and open file usage at exit.-T, --debug-infoPrint 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 orcommand line.--detach=#Detach (close and reopen) connections after X number ofrequests.--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 ifspecifying --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 notexact).--only-printDo not connect to the databases, but instead print outwhat would have been done.-p, --password[=name] Password to use when connecting to server. If password isnot 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 aftertests have completed.--post-system=namesystem() string to execute after tests have completed.--pre-query=nameQuery to run or file containing query to execute beforerunning 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=nameQuery 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, --silentRun program in silent mode - no output.-S, --socket=name The socket file to use for connection.--ssl Enable SSL for connection (automatically enabled withother 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=nameX509 key in PEM format (implies --ssl).--ssl-crl=nameCertificate revocation list (implies --ssl).--ssl-crlpath=nameCertificate revocation list path (implies --ssl).--ssl-verify-server-cert Verify server's "Common Name" in its cert againsthostname used when connecting. This option is disabled bydefault.-u, --user=name User for login if not current user.-v, --verbose More verbose output; you can use this multiple times toget 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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