併發測試多個網址

在本章中，我們將瞭解如何同時測試多個 URL。為此，我們需要編輯我們的應用程式檔案 app.py 以包含兩個 URL -

from bottle import Bottle, run

app = Bottle()

@app.route('/')
@app.route('/hello1')
def hello():
   return "Hello World! It is first URL."

@app.route('/hello2')
def hello():
   return "Hello World! It is second URL."

run(app,server = 'gunicorn',host = '127.0.0.1', port = 8080)

建立一個簡單的 shell 指令碼

你可以透過建立帶有多個 ab 呼叫的 shell 指令碼來執行此操作。建立一個檔案 test.sh 並向其中新增以下行 -

ab -n 100 -c 10 http://127.0.0.1:8080/hello1 
ab -n 100 -c 10 http://127.0.0.1:8080/hello2

新增上述行後，儲存並關閉該檔案。使檔案可執行 -

chmod u+x test.sh

現在讓我們執行指令碼 -

./test.sh

為了避免重複和澄清目的，我們將只顯示 ab 輸出中的相關部分，並用點來表示已省略的部分，如下所示。

輸出

.
.
.
Document Path:          /hello1
Document Length:        732 bytes

Concurrency Level:      10
Time taken for tests:   0.040 seconds
Complete requests:      100
Failed requests:        0
Non-2xx responses:      100
Total transferred:      90000 bytes
HTML transferred:       73200 bytes
Requests per second:    2496.13 [#/sec] (mean)
Time per request:       4.006 [ms] (mean)
Time per request:       0.401 [ms] (mean, across all concurrent requests)
Transfer rate:          2193.87 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.8      0       3
Processing:     1    3   1.0      4       5
Waiting:        0    3   1.2      4       4
Total:          1    4   0.6      4       5
WARNING: The median and mean for the processing time are not within a normal deviation
        These results are probably not that reliable.
.
.
.

將 Apache Bench 輸出儲存到檔案的 Shell 指令碼

你可以透過建立帶有多個 ab 呼叫的 shell 指令碼將 Apache Bench 輸出儲存到檔案。在每一行的末尾，放置一個 &;；這會使命令在後臺執行，並讓下一條命令開始執行。你還會希望將每個 URL 的輸出重定向到一個檔案，使用 <filename>。例如，我們的檔案 test.sh 在修改後將如下所示 -

$ ab -n 100 -c 10 http://127.0.0.1:8080/hello1 > test1.txt &
$ ab -n 100 -c 10 http://127.0.0.1:8080/hello2 > test2.txt &

此處，test1.txt 和 test2.txt 是儲存輸出資料的檔案。

你可以檢查上面的指令碼是否建立了兩個檔案 test1.txt 和 test2.txt，其中包含各個 URL 的 ab 輸出 -

$ ls -l

輸出

...
-rw-r--r-- 1 root root  5225 May 30 12:11 out.data
-rwxr--r-- 1 root root   118 Jun 10 12:24 test.sh
-rw-r--r-- 1 root root  1291 Jun 10 12:31 test1.txt
-rwxr--r-- 1 root root    91 Jun 10 13:22 test2.sh
-rw-r--r-- 1 root root  1291 Jun 10 12:31 test2.txt
...

注意情況

在使用 ab 時，你應該注意未經警告就進行的失敗測試。例如，如果你檢查一個錯誤的 URL，你可能會得到類似以下內容（我們在這裡故意更改了埠）。

$ ab -l -r -n 100 -c 10 -k -H "Accept-Encoding: gzip, deflate"  http://127.0.0.1:805/

輸出

This is ApacheBench, Version 2.3 <$Revision: 1604373 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient).....done

Server Software:
Server Hostname:        127.0.0.1
Server Port:            805

Document Path:          /
Document Length:        Variable

Concurrency Level:      10
Time taken for tests:   0.002 seconds
Complete requests:      100
Failed requests:        150
   (Connect: 0, Receive: 100, Length: 0, Exceptions: 50)
Keep-Alive requests:    0
Total transferred:      0 bytes
HTML transferred:       0 bytes
Requests per second:    44984.26 [#/sec] (mean)
Time per request:       0.222 [ms] (mean)
Time per request:       0.022 [ms] (mean, across all concurrent requests)
Transfer rate:          0.00 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.0      0       0
Processing:     0    0   0.2      0       0
Waiting:        0    0   0.0      0       0
Total:          0    0   0.2      0       0

Percentage of the requests served within a certain time (ms)
  50%      0
  66%      0
  75%      0
  80%      0
  90%      0
  95%      0
  98%      0
  99%      0
 100%      0 (longest request)