目前我安裝的 Homestead 虛擬機版本是 2.1.8：
該版本 Homestead 上預裝的 PHP 版本是 5.6.15：
我們使用 ab 命令（Apache 提供的性能測試工具）在該版本中測試 Laravel 應用（以目前正在講的使用Laravel開發的博客應用爲例）性能，我們模擬 10000 次請求，100 個併發進行壓力測試：
ab -n 10000 -c 100 http://blog.app/
運行結果如下：
This is ApacheBench, Version 2.3
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking blog.app (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
Completed 6000 requests
Completed 7000 requests
Completed 8000 requests
Completed 9000 requests
Completed 10000 requests
Finished 10000 requests
Server Software: nginx/1.8.0
Server Hostname: blog.app
Server Port: 80
Document Path: /
Document Length: 324 bytes
Concurrency Level: 100
Time taken for tests: 69.354 seconds
Complete requests: 10000
Failed requests: 0
Total transferred: 19851388 bytes
HTML transferred: 10230000 bytes
Requests per second: 144.19 [#/sec] (mean)
Time per request: 693.545 [ms] (mean)
Time per request: 6.935 [ms] (mean, across all concurrent requests)
Transfer rate: 279.52 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.2 0 3
Processing: 17 684 319.1 588 2720
Waiting: 17 684 319.1 588 2720
Total: 20 684 319.1 588 2720
Percentage of the requests served within a certain time (ms)
50% 588
66% 695
75% 842
80% 933
90% 1155
95% 1321
98% 1545
99% 1813
100% 2720 (longest request)
這裏我們要關注的是紅色加粗的文字，即每秒處理請求數，這是衡量系統性能的關鍵指標。根據系統及硬件配置的差異，數據會有些出入。
現在我們按照“Laravel Homestead 支持 PHP 7 ”這一節所述將 Homestead 中的 PHP 升級到 7.0 版本。
使用 vagrant ssh 登錄到新添加的 homestead-7 虛擬機，查看 PHP 版本信息是否正確：
此時在瀏覽器中訪問 http://blog.app 會報錯，因爲新安裝的 Homestead 數據庫數據爲空，需要登錄到虛擬機運行如下命令運行遷移並填充數據：
php artisan migrate
php artisan db:seed
再次訪問就OK了，好了我們繼續使用同樣的 ab 命令進行壓力測試：
ab -n 10000 -c 100 http://blog.app/
運行結果如下：
This is ApacheBench, Version 2.3
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking blog.app (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
Completed 6000 requests
Completed 7000 requests
Completed 8000 requests
Completed 9000 requests
Completed 10000 requests
Finished 10000 requests
Server Software: nginx/1.8.0
Server Hostname: blog.app
Server Port: 80
Document Path: /
Document Length: 324 bytes
Concurrency Level: 100
Time taken for tests: 45.032 seconds
Complete requests: 10000
Failed requests: 0
Total transferred: 20101202 bytes
HTML transferred: 10230000 bytes
Requests per second: 222.06 [#/sec] (mean)
Time per request: 450.319 [ms] (mean)
Time per request: 4.503 [ms] (mean, across all concurrent requests)
Transfer rate: 435.91 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.2 0 4
Processing: 11 443 252.8 379 1978
Waiting: 11 443 252.8 379 1978
Total: 15 443 252.8 379 1978
Percentage of the requests served within a certain time (ms)
50% 379
66% 517
75% 590
80% 631
90% 795
95% 938
98% 1060
99% 1229
100% 1978 (longest request)
經過對比，同一個 Laravel 應用在 PHP 7.0 下的性能比 PHP 5.6 提高了54%，這是一個很顯著的性能提升，當然環境不同數據會有所出入，而且還有更大的提升空間。
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