Поскольку мой вопрос становится все длиннее и длиннее, я решил переписать весь вопрос, чтобы сделать его лучше и короче.

Я запускаю свой сайт на выделенном сервере с 8 ГБ памяти. Я полностью осознаю, что мне нужно увеличить ограничение памяти при настройке php.ini. Я установил его от 128M до 256M и -1. Тем не менее проблема заключается в настойчивости.

Fatal error: Out of memory (allocated 786432) (tried to allocate 24576 bytes) in D:\www\football\views\main.php on line 81

Недостаточно памяти не имеет смысла, потому что он сказал, что выделено только 786432 байта, и ему нужно еще 24576 байтов.

786432 байта занимает всего 768 килобайт и довольно мало.

Hints The error occurs on a very random line. It does not always error on line number 81. At peak time, Apache only takes around 500mb of memory. I still have 6GB to spare. There is no infinite loop. The script takes 1,042,424 bytes. Getting this number from echo memory_get_peak_usage(); The resultset from MySQL is small (at most 12 of rows, purely text, no blob data) (Important) If I restart Apache once every two days, the error is gone. It usually happens when Apache is running more than 2 days. I have included the profiling the script and you can get it here. This dedicated server is purely used to run only one website. This website is a high traffic website with average of 1,000 visitors every minute. At peak time, there will be 1,700 to 2,000 visitors accessing at the same time. Server Spec

OS: Windows 2008 R2 64-Bit
CPU: Intel Core i5 - 4 cores
RAM: 8 GB
Apache 2.2
PHP 5.3.1
Storage: 2 x 1 TB hard drives
Bandwidth: 10 TB per month

Solution

Я наконец настроил и исправил проблему, и я хотел бы поделиться здесь, что я сделал для улучшения:

favicon.ico was missing which mess up with my route engine. Although my route engine is very small, but by including favicon.ico, it helps reduce memory usage by not running my route engine. Most of part of my website has it and I forgot to put it for this new section.

Limit MaxRequestPerChild helps. In my other dedicated server, I have my MaxRequestPerChild limited. For this server, I set it to 0. I always thought that each script is isolated. Lets say if my script takes 800kb to run. Upon its completion, Apache or PHP should free 800kb memory. It seem like it doesn't work this way. Limited MaxRequestPerChild does help to prevent memory leak by creating new process after limited MaxRequestPerChild and the old process is dying. This is my new setting.

ThreadsPerChild      1500
MaxRequestsPerChild  10000 

ob_flush(); does reduce slightly more memory. It does not help much but every bit of optimization helps.

I have used xdebug which I have never used before as suggested by people who attempt to answer this question. I have to say it is great tool and I have optimized a few stuffs to make it run slightly faster. I have disable a few unnecessary Apache module. I am trying to disable it one by one and leave it a few days test to ensure it works perfectly before I disable another one. I do have all unnecessary PHP extension disable now. Most of my script in this server used traditional way (no template, no database layer, pure PHP, HTML, and legacy mysql_* function). To be honest, it runs very fast and used extremely small memory. However, maintenance the script is not very easy as the website is getting longer. I have tried to convert some parts of the website into proper framework (my own tiny framework). The reason that I used my own framework because it is tiny (3kb for the whole framework and include only what I need). Switching to IIS7.5 solving this problem completely.