目前我安裝的Homestead 虛擬機器版本是2.1.8：
#該版本Homestead 上預先安裝的PHP 版本是5.6.15：
我們使用ab 指令（Apache 提供的效能測試工具）在這個版本中測試Laravel 應用程式（以目前正在講的使用Laravel開發的部落格應用為例）效能，我們模擬10000 次請求，100 個同時進行壓力測試：
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)這裡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。根據系統及硬體配置的差異，數據會有些出入。
現在我們按照「Laravel Homestead 支援 PHP 7 」這一節所述將 Homestead 中的 PHP 升級到 7.0 版本。
使用vagrant ssh 登入新新增的homestead-7 虛擬機，查看PHP 版本資訊是否正確：
此時在瀏覽器中存取http ://blog.app 會報錯，因為新安裝的Homestead 資料庫資料為空，需要登入虛擬機器運行如下命令運行遷移並填充資料：
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 指令進行壓力測試：
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 下的表現比PHP 5.6 提高了54%，這是一個很顯著的效能提升，當然環境不同資料會有所出入，而且還有更大的提升空間。
原文網址：https://xueyuanjun.com/post/2398
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