Phần 2 – Sử dụng APD

Do hoàn cảnh đang phải làm việc trên windows cộng với việc ở Việt Nam nhiều bạn sử dụng windows nên tôi mạn phép trình bày cách sử dụng APD trên môi trường windows. Dĩ nhiên những ai sử dụng linux cũng có thể làm tương tự như trong bài.
Trong bài viết này, tôi thử áp dụng APD cho một CMS mã nguồn mở made in Vietnam là TomatoCMS. Phiên bản được sử dụng là TomatoCMS ver 2.0.5.

Cách sử dụng

Thêm đoạn mã sau vào bất kì nơi nào trong ứng dụng PHP bạn muốn bắt đầu quá trình profiling, dĩ nhiên nếu bạn muốn profiling toàn bộ ứng dụng thì nên đặt nó tại dòng lệnh đầu tiên được thực thi:

apd_set_pprof_trace('C:\temp');

Câu lệnh trên sẽ ra lệnh cho APD bắt đầu việc ghi lại quá trình thực thi của ứng dụng PHP. APD sẽ can thiệp vào trong Zend engine và ghi lại các lời gọi hàm, thời gian thực hiện của chúng, … Những thông tin này sẽ được ghi vào file tại một thư mục được chỉ định. Trong đoạn mã trên, ‘C:\temp’ là thư mục mà chúng ta muốn ghi các file đầu ra của APD. Nếu không có đối số truyền vào, các file này sẽ được lưu vào thư mục đã được định nghĩa trong file php.ini. Ví dụ, sau khi cài đặt xong APD, chúng ta có thể thêm dòng sau vào file php.in:
apd.dumpdir = C:\temp

Sử dụng APD với TomatoCMS

TomatoCMS là một hệ quản trị nội dung mã nguồn mở được xây dựng trên Zend framework. File đầu tiên trong ứng dụng được gọi đến sẽ là file index.php. Do đó tôi thêm đoạn mã sau vào dòng đầu tiên của file index.php:

// Start APD trace
apd_set_pprof_trace('C:\temp');

Sau đó tôi mở trình duyệt và truy cập vào TomatoCMS như bình thường, tuy nhiên để ý rằng sau mỗi lần truy cập, APD sẽ tạo ra một file mới trong thư mục C:\temp. File này ghi lại những thông tin về quá trình thực thi của ứng dụng PHP. Giả sử sau khi truy cập, file được tạo ra là pprof.02672.0.
Để đọc được những thông tin hữu ích từ file này, tôi mở Command prompt bằng cách vào Run và gõ cmd. Di chuyển đến thư mục đã cài PHP (thư mục chứa file php.exe) và thực thi câu lệnh sau:

php pprofp -u C:\temp\pprof.02672.0

Kết quả thống kê về quá trình thực thi TomatoCMS được hiển thị ra trên màn hình console. Để ghi kết quả này ra file, giả sử file C:\temp\output.txt, tôi sử dụng câu lệnh:

php pprofp -u C:\temp\pprof.02672.0 >C:\temp\output.txt

[Chú ý]: Nếu sau khi thực hiện dòng lệnh trên, hệ thống báo lỗi không tìm thấy file pprofp, hãy download nó tại đây, giải nén và lưu vào cùng thư mục với file php.exe. File này include file Console\Getopt.php trong thư viện PEAR do đó có thể bạn sẽ phải đổi lại đường dẫn của chúng cho phù hợp.

Trong trường hợp của tôi, kết quả hiển thị trên màn hình sau khi thực thi câu lệnh trên như sau:
Cú pháp của câu lệnh pprofp như sau:

pprofp <option> <tracefile>

Trong đó <tracefile> là file ghi lại quá trình thực thi PHP script do APD sinh ra. <option> là những lựu chọn. Bạn có thể xem chi tiết những option này bằng cách gõ lệnh

php pprofp

Trong câu lệnh tôi đã sử dụng, <tracefile> là file C:\temp\pprof.02672.0, tôi dùng option -u vì muốn sắp xếp các lời gọi hàm theo thời gian thực thi từ cao đến thâp.

Nhìn vào kết quả, chúng ta thấy rằng hàm strpos chiếm nhiêu thời gian thực thi nhất và được gọi 3849 lần:

Ngoài ra chúng ta cũng có thể xem thứ tự thực thi các hàm trong ứng dụng. Sử dụng câu lệnh sau:

php pprofp -t C:\temp\pprof.02672.0

Chúng ta sẽ thu được kết quả dưới dạng cây, trong đó hiển thị thứ tự thực thi của các hàm trong ứng dụng. Thông tin này sẽ vô cùng hữu ích nếu chúng ta cần biết chi tiết các hàm trong ứng dụng được gọi như thế nào.

Ngoài function apd_set_pprof_trace() trên, APD còn có nhiều function khác để thuận tiện cho việc debug và profile ứng dụng PHP. Các bạn có thể tham khảo những hàm này tại đây.
Bài viết này chỉ mang tính giới thiệu. APD là một công cụ rất mạnh và hữu ích. Tuy nhiên nói gì thì nói, nó cũng chỉ là một công cụ. Vấn đề là sử dụng nó như thế nào sao cho hợp lý và đem lại hiệu quả cao nhất.

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