Common concurrent testing tools and pressure testing methods

1.Apache Benchmark

         stay centos7 Install in ：

yum -y install httpd-tools

        example ：

ab -c 100 -n 10000 URL

         Parameter description ：

 Besides , Let's introduce the interface according to the above usage to understand the function of each parameter option in detail .

-n	 namely requests, Used to specify the total number of stress tests performed .
-c	 namely concurrency, Used to specify the number of concurrencies .
-t	 namely timelimit, The maximum time to wait for a response ( Company ： second ).
-b	 namely windowsize,TCP send out / Received buffer size ( Company ： byte ).
-p	 namely postfile, send out POST Files to be uploaded when requested , In addition, you have to set -T Parameters .
-u	 namely putfile, send out PUT Files to be uploaded when requested , In addition, you have to set -T Parameters .
-T	 namely content-type, Used for setting up Content-Type Request header information , for example ：application/x-www-form-urlencoded, The default value is text/plain.
-v	 namely verbosity, Specifies the level of redundancy for printing help information .
-w	 With HTML Print the results in tabular form .
-i	 Use HEAD Ask to replace GET request .
-x	 Insert string as table Attributes of the tag .
-y	 Insert string as tr Attributes of the tag .
-z	 Insert string as td Attributes of the tag .
-C	 add to cookie Information , for example ："Apache=1234"( You can repeat this parameter option to add multiple ).
-H	 Add any request header , for example ："Accept-Encoding: gzip", The request header will be added after the existing multiple request headers ( You can repeat this parameter option to add multiple ).
-A	 Add a basic network authentication information , The user name and password are separated by colons .
-P	 Add a basic proxy authentication information , The user name and password are separated by colons .
-X	 Specify the used and port number , for example :"126.10.10.3:88".
-V	 Print version number and exit .
-k	 Use HTTP Of KeepAlive characteristic .
-d	 Don't show percentages .
-S	 Don't show estimates and warnings .
-g	 Output the result information to gnuplot Format file .
-e	 Output the result information to CSV Format file .
-r	 Specifies not to exit the program when an error message is received .
-h	 Display usage information , In fact, that is ab -help.

        Test result description ：

Server Software:        nginx/1.10.2 ( Server software name and version information )
Server Hostname:        192.168.1.106( Server hostname )
Server Port:            80 ( Server port )
Document Path:          /index1.html. ( For testing URL route )
Document Length:        3721 bytes ( For testing URL The size of the returned document )
Concurrency Level:      1000 ( Concurrency number )
Time taken for tests:   2.327 seconds ( Total time spent on stress testing )
Complete requests:      5000 ( The total number of times )
Failed requests:        688 ( Number of failed requests )
Write errors:           0 ( Number of network connection write errors )
Total transferred:      17402975 bytes ( The total amount of data transferred )
HTML transferred:       16275725 bytes (HTML The total amount of data in the document )
Requests per second:    2148.98 [#/sec] (mean) ( The average number of requests per second )  This is a very important parameter value , Throughput of the server  
Time per request:       465.338 [ms] (mean) ( All concurrent users ( Here is 1000) The average time it takes to request once )
Time  request:       0.247 [ms] (mean, across all concurrent requests) ( The average time for a single user to request )
Transfer rate:          7304.41 [Kbytes/sec] received  Data length obtained per second  ( Transmission rate , Company ：KB/s)
...
Percentage of the requests served within a certain time (ms)
  50%    347  ## 50% Request on 347ms Back inside  
  66%    401  ## 60% Request on 401ms Back inside  
  75%    431
  80%    516
  90%    600
  95%    846
  98%   1571
  99%   1593
 100%   1619 (longest request)

（ Original excerpt from the above part ：CentOS7 ab Pressure test installation and interpretation _u011415782 The column -CSDN Blog _centos install ab）