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MySQL压力测试工具 mysqlslap --create-schema=example --query="SELECT * FROM group_message force index(group_message_author_subject) WHERE author = '3' subject LIKE 'weiurazs%'" --iterations=10000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-printDROP SCHEMA IF EXISTS mysqlslap;CREATE SCHEMA mysqlslap;use mysqlslap;CREATE TABLE g_user (user_id INT(32) ,user_name VARCHAR(128));INSERT INTO g_user VALUES (1,'liuxiaobin');…SELECT user_id,user_name FROM g_user;INSERT INTO g_user VALUES (2,'liudabin');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-infoBenchmarkAverage number of seconds to run all queries: 0.375 secondsMinimum number of seconds to run all queries: 0.375 secondsMaximum number of seconds to run all queries: 0.375 secondsNumber of clients running queries: 50Average number of queries per client: 20 BenchmarkAverage number of seconds to run all queries: 0.453 secondsMinimum number of seconds to run all queries: 0.453 secondsMaximum number of seconds to run all queries: 0.453 secondsNumber of clients running queries: 100Average number of queries per client: 10 User time 0.29, System time 0.11Maximum resident set size 0, Integral resident set size 0Non-physical pagefaults 4032, Physical pagefaults 0, Swaps 0Blocks in 0 out 0, Messages in 0 out 0, Signals 0Voluntary 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-infoBenchmarkAverage number of seconds to run all queries: 0.380 secondsMinimum number of seconds to run all queries: 0.377 secondsMaximum number of seconds to run all queries: 0.385 secondsNumber of clients running queries: 50Average number of queries per client: 20 BenchmarkAverage number of seconds to run all queries: 0.447 secondsMinimum number of seconds to run all queries: 0.444 secondsMaximum number of seconds to run all queries: 0.451 secondsNumber of clients running queries: 100Average number of queries per client: 10 User time 1.44, System time 0.67Maximum resident set size 0, Integral resident set size 0Non-physical pagefaults 17922, Physical pagefaults 0, Swaps 0Blocks in 0 out 0, Messages in 0 out 0, Signals 0Voluntary 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,innodb –debug-infoBenchmarkRunning for engine myisamAverage number of seconds to run all queries: 0.200 secondsMinimum number of seconds to run all queries: 0.188 secondsMaximum number of seconds to run all queries: 0.210 secondsNumber of clients running queries: 50Average number of queries per client: 20 BenchmarkRunning for engine myisamAverage number of seconds to run all queries: 0.238 secondsMinimum number of seconds to run all queries: 0.228 secondsMaximum number of seconds to run all queries: 0.251 secondsNumber of clients running queries: 100Average number of queries per client: 10 BenchmarkRunning for engine innodbAverage number of seconds to run all queries: 0.375 secondsMinimum number of seconds to run all queries: 0.370 secondsMaximum number of seconds to run all queries: 0.379 secondsNumber of clients running queries: 50Average number of queries per client: 20 BenchmarkRunning for engine innodbAverage number of seconds to run all queries: 0.443 secondsMinimum number of seconds to run all queries: 0.440 secondsMaximum number of seconds to run all queries: 0.447 secondsNumber of clients running queries: 100Average number of queries per client: 10 User time 2.83, System time 1.66Maximum resident set size 0, Integral resident set size 0Non-physical pagefaults 34692, Physical pagefaults 0, Swaps 0Blocks in 0 out 0, Messages in 0 out 0, Signals 0Voluntary context switches 87306, Involuntary context switches 10326 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， –auto-generate-sql, -a自动生成测试表和数据 –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(并发客户数×每客户查询次数) –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 作者 bengda bitsCN.com
