Apache Bench stress testing tool implementation principle and usage analysis

1: Throughput (Requests per second)

A quantitative description of the server's concurrent processing capability, measured in reqs/s, which refers to the number of requests processed per unit time under a certain number of concurrent users. The maximum number of requests that can be processed per unit time under a certain number of concurrent users is called the maximum throughput.

Remember: throughput is based on the number of concurrent users. This sentence represents two meanings: 1. The throughput rate is related to the number of concurrent users; 2. The throughput rate is generally different under different numbers of concurrent users.

Calculation formula: total number of requests / time spent processing these requests, that is,

Request per second = Complete requests / Time taken for tests

2: The number of concurrent connections

The number of concurrent connections refers to the number of requests accepted by the server at a certain moment, or simply put, a session.

3: The number of concurrent users (Concurrency Level)

It is important to distinguish this concept from the number of concurrent connections. A user may have multiple sessions, or connections, at the same time. Under HTTP/1.1, IE7 supports two concurrent connections, IE8 supports six concurrent connections, and FireFox3 supports four concurrent connections, so accordingly, the number of our concurrent users must be divided by this base.

4: Average user request waiting time (Time per request)

Calculation formula: time taken to process all requests / (total number of requests / number of concurrent users), that is

Time per request = Time taken for tests / (Complete requests / Concurrency Level)

5: Server average request waiting time (Time per request: across all concurrent requests)

Calculation formula: time taken to process all requests/total number of requests, that is

Time taken for / testsComplete requests

As you can see, it is the inverse of the throughput rate.

At the same time, it is also = average user request waiting time / number of concurrent users, that is,

Time per request / Concurrency Level

Official website download address: https://www.apachelounge.com/download/

After downloading, unzip it and use cmd to enter the current project decompression directory:

Then enter the shell command execution interface (enter the bin directory):

Test command:

./ab -n 100 -c 10 http://localhost:8085/linewell/test1/pass/testApacheBench.do

-n indicates the number of requests, and -c indicates a maximum of several requests can be sent simultaneously.

Because of my Java test, if -c is set to 1, the Java backend controller will delay for one second, and will process them one by one, basically requiring 100 processing times. If -c is 10, 10 will be processed at a time.

Output:

This is ApacheBench, Version 2.3 <$Revision: 1843412 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking localhost (be patient).....done


Server Software:
Server Hostname: localhost
Server Port: 8085

Document Path: /linewell/test1/pass/testApacheBench.do
Document Length: 0 bytes

Concurrency Level: 10
Time taken for tests: 0.077 seconds
Complete requests: 100
Failed requests: 0
Non-2xx responses: 100
Total transferred: 9200 bytes
HTML transferred: 0 bytes
Requests per second: 1299.09 [#/sec] (mean)
Time per request: 7.698 [ms] (mean)
Time per request: 0.770 [ms] (mean, across all concurrent requests)
Transfer rate: 116.72 [Kbytes/sec] received

Connection Times (ms)
    min mean[+/-sd] median max
Connect: 0 0 0.3 0 1
Processing: 1 5 3.4 5 27
Waiting: 1 4 3.1 4 26
Total: 2 5 3.4 5 27

Percentage of the requests served within a certain time (ms)
 50% 5
 66% 6
 75% 7
 80% 7
 90% 9
 95% 11
 98% 11
 99% 27
 100% 27 (longest request)

Output result analysis:

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