Apache_bench marking tool_to identify the HTTP server performance along with AEM server Laod testing

Solution :

• ab is a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. 
• It is designed to give you an impression of how your current Apache installation performs. 
• This especially shows you how many requests per second your Apache installation is capable of serving.
• To minimize the impact of  garbage collection, etc, it is recommended to use a tool such as apachebench 
• To help identify memory leaks and selectively analyze response time.

Apache Bench can be used in the following way:

$ ab -c 5 -k -n 1000 "http://localhost:4503/content/geometrixx/en/company.html"

this is ApacheBench, Version 2.3 <$Revision: 655654 $>

Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/

Licensed to The Apache Software Foundation, http://www.apache.org/T

Benchmarking localhost (be patient)

Completed 100 requests

Completed 200 requests

Completed 300 requests

Completed 400 requests

Completed 500 requests

Completed 600 requests

Completed 700 requests

Completed 800 requests

Completed 900 requests

Completed 1000 requests

Finished 1000 requests

Server Software: Day-Servlet-Engine/4.1.52

Server Hostname: localhost

Server Port: 4503

Document Path: /content/geometrixx/en/company.html

Document Length: 24127 bytes

Concurrency Level: 5

Time taken for tests: 69.766 seconds

Complete requests: 1000

Failed requests: 998

(Connect: 0, Receive: 0, Length: 998, Exceptions: 0)

Write errors: 0

Keep-Alive requests: 0

Total transferred: 24160923 bytes

HTML transferred: 24010923 bytes

Requests per second: 14.33 /sec (mean)

Time per request: 348.828 [ms] (mean)

Time per request: 69.766 [ms] (mean, across all concurrent requests)

Transfer rate: 338.20 [Kbytes/sec] received

Connection Times (ms)

min mean[+/-sd] median max

Connect: 0 1 3.9 0 58

Processing: 138 347 568.5 282 8106

Waiting: 137 344 568.1 281 8106

Total: 139 348 568.4 283 8106

Percentage of the requests served within a certain time (ms)

50% 283

66% 323

75% 356

80% 374

90% 439

95% 512

98% 1047

99% 1132

100% 8106 (longest request)

• apachebench also displays the time per request as the mean, across all concurrent requests;

see Time per request: 54.595 [ms] (mean, across all concurrent requests). 

• You can change the value of the concurrency parameter -c(number of multiple requests to perform at a time) to see any effects.

Command details :

-c concurrency

Number of multiple requests to perform at a time. 
Default is one request at a time.

     -k

Enable the HTTP KeepAlive feature, i.e., perform multiple requests within one HTTP session. Default is no KeepAlive.

     -n requests

Number of requests to perform for the benchmarking session. The default is to just perform a single request which usually leads to non-representative benchmarking results.

Reference : http://httpd.apache.org/docs/2.2/programs/ab.html