stress test - volume test

 D:\wamp64\bin\mysql\mysql5.7.11\bin>mysqlslap --delimiter=";" --query=" INSERT I
 NTO a VALUES (23);SELECT * FROM a" --concurrency=50 --iterations=200
 Benchmark
         Average number of seconds to run all queries: 0.405 seconds
         Minimum number of seconds to run all queries: 0.046 seconds
         Maximum number of seconds to run all queries: 1.359 seconds
         Number of clients running queries: 50
         Average number of queries per client: 2

 D:\wamp64\bin\mysql\mysql5.7.11\bin>

 +------+
 10001 rows in set (0.03 sec)

 mysql> SELECT COUNT(*) FROM a;
 +----------+
 | COUNT(*) |
 +----------+
 |    10001 |
 +----------+
 1 row in set (0.02 sec)

 mysql>

The art of software testing / Glenford J. Myers, Corey Sandler, Tom Badgett. — 3rd ed.

 

Stress testing subjects the program to heavy loads, or stresses. This shouldnot be confused with volume testing;a heavy stress is a peak volume ofdata, or activity, encountered over a short span of time.An analogy would be  evaluating a typist: A volume test would determine whether the typist could cope with a draft of a large report; a stress test would determine whether the typist could type at a rate of 50 words per minute.
Because stress testing involves an element of time, it is not applicable to many programs—for example, a compiler or a batch-processing payroll program. It is applicable, however, to programs that operate under varying loads, or interactive, real-time, and process control programs. If an air traf-fic control system is supposed to keep track of up to 200 planes in its sector, you could stress-test it by simulating the presence of 200 planes. Since there is nothing to physically keep a 201st plane from entering the sector, a further stress test would explore the system’s reaction to this unexpected plane. An additional stress test might simulate the simultaneous entry of a large number of planes into the sector.

//批处理工资程序 由于客观上无法避免第201架飞机进入该区域

Web-based applications are common subjects of stress testing. Here,you want to ensure that your application, and hardware, can handle a target volume of concurrent users. You could argue that you may have millions of people accessing the site at one time, but that is not realistic. You need to define your audience then design a stress test to represent the max-imum number of users you think will use your site.

 

启发：

0-从这个角度去辨明“并发”-concurrency的特征