MySQL壓力測試工具
mysqlslap --create-schema=example --query="SELECT * FROM group_message force index(group_message_author_subject) WHERE author = '3' subject LIKE 'weiurazs%'" --iterations=10000
測試的過程需要生成測試表，插入測試數據，這個mysqlslap可以自動生成，默認生成一個mysqlslap的schema，如果已經存在則先刪除，這裡要注意了，不要用–create-schema指定已經存在的庫，否則後果可能很嚴重。可以用
–only-print來打印實際的測試過程：
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$mysqlslap -a –only-print
DROP 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;
可以看到最後由刪除一開始創建的schema的動作，整個測試完成後不會在數據庫中留下痕跡。假如我們執行一次測試，分別50和100個並發，執行1000次總查詢，那麼：
$mysqlslap -a –concurrency=50,100 –number-of-queries 1000 –debug-info
Benchmark
Average number of seconds to run all queries: 0.375 seconds
Minimum number of seconds to run all queries: 0.375 seconds
Maximum number of seconds to run all queries: 0.375 seconds
Number of clients running queries: 50
Average number of queries per client: 20
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Benchmark
Average number of seconds to run all queries: 0.453 seconds
Minimum number of seconds to run all queries: 0.453 seconds
Maximum number of seconds to run all queries: 0.453 seconds
Number of clients running queries: 100
Average number of queries per client: 10
User time 0.29, System time 0.11
Maximum resident set size 0, Integral resident set size 0
Non-physical pagefaults 4032, Physical pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals 0
Voluntary context switches 7319, Involuntary context switches 681
上結果可以看出，50和100個並發分別得到一次測試結果(Benchmark)，並發數越多，執行完所有查詢的時間越長。為了准確起見，可以多迭代測試幾次:
$ mysqlslap -a –concurrency=50,100 –number-of-queries 1000 –iterations=5 –debug-info
Benchmark
Average number of seconds to run all queries: 0.380 seconds
Minimum number of seconds to run all queries: 0.377 seconds
Maximum number of seconds to run all queries: 0.385 seconds
Number of clients running queries: 50
Average number of queries per client: 20
Benchmark
Average number of seconds to run all queries: 0.447 seconds
Minimum number of seconds to run all queries: 0.444 seconds
Maximum number of seconds to run all queries: 0.451 seconds
Number of clients running queries: 100
Average number of queries per client: 10
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User time 1.44, System time 0.67
Maximum resident set size 0, Integral resident set size 0
Non-physical pagefaults 17922, Physical pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals 0
Voluntary context switches 36796, Involuntary context switches 4093
測試同時不同的存儲引擎的性能進行對比：
$ mysqlslap -a –concurrency=50,100 –number-of-queries 1000 –iterations=5 –engine=myisam,innodb –debug-info
Benchmark
Running for engine myisam
Average number of seconds to run all queries: 0.200 seconds
Minimum number of seconds to run all queries: 0.188 seconds
Maximum number of seconds to run all queries: 0.210 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: 0.238 seconds
Minimum number of seconds to run all queries: 0.228 seconds
Maximum number of seconds to run all queries: 0.251 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: 0.375 seconds
Minimum number of seconds to run all queries: 0.370 seconds
Maximum number of seconds to run all queries: 0.379 seconds
Number of clients running queries: 50
Average number of queries per client: 20
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Benchmark
Running for engine innodb
Average number of seconds to run all queries: 0.443 seconds
Minimum number of seconds to run all queries: 0.440 seconds
Maximum number of seconds to run all queries: 0.447 seconds
Number of clients running queries: 100
Average number of queries per client: 10
User time 2.83, System time 1.66
Maximum resident set size 0, Integral resident set size 0
Non-physical pagefaults 34692, Physical pagefaults 0, Swaps 0
Blocks in 0 out 0, Messages in 0 out 0, Signals 0
Voluntary context switches 87306, Involuntary context switches 10326
MySQL從5.1.4版開始帶有一個壓力測試工具mysqlslap，通過模擬多個並發客戶端訪問mysql來執行測試，使用起來非常的簡單。通過mysqlslap –help可以獲得可用的選項，
–auto-generate-sql, -a
自動生成測試表和數據
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–auto-generate-sql-load-type=type
測試語句的類型。取值包括：read，key，write，update和mixed(默認)。
–number-char-cols=N, -x N
自動生成的測試表中包含多少個字符類型的列，默認1
–number-int-cols=N, -y N
自動生成的測試表中包含多少個數字類型的列，默認1
–number-of-queries=N
總的測試查詢次數(並發客戶數×每客戶查詢次數)
–query=name,-q
使用自定義腳本執行測試，例如可以調用自定義的一個存儲過程或者sql語句來執行測試。
–create-schema
測試的schema，MySQL中schema也就是database
–commint=N
多少條DML後提交一次
–compress, -C
如果服務器和客戶端支持都壓縮，則壓縮信息傳遞
–concurrency=N, -c N
並發量，也就是模擬多少個客戶端同時執行select。可指定多個值，以逗號或者–delimiter參數指定的值做為分隔符
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–engine=engine_name, -e engine_name
創建測試表所使用的存儲引擎，可指定多個
–iterations=N, -i N
測試執行的迭代次數
–detach=N
執行N條語句後斷開重連
–debug-info, -T
打印內存和CPU的信息
–only-print
只打印測試語句而不實際執行
作者 bengda
