服务器文件最大访问频率 [英] Maximum server file access frequency

问题描述

我正在尝试使用Comet长轮询方法在PHP中创建AJAX推送实现。我的代码涉及使用 file_get_contents（）重复读取文件，以检查是否有任何消息要发送给用户。为了减少服务器负载，我使用了两个文本文件；一个包含实际命令，另一个充当更改通知程序，它可以通过0-9进行迭代，或者包含UNIX时间戳。我的问题是，在不使服务器超负荷的情况下，我多久可以访问和读取一个小文件（仅几个字节）？强制实施意味着我可以比每隔几秒钟请求文件更频繁地轮询更改，但是仍然有一定的限制。

I'm trying to create a AJAX push implementation in PHP using a Comet long-polling method. My code involves using file_get_contents() to read a file repeatedly to check for any messages to send to the user. To reduce server load, I'm using two text files; one containing the actual command and one acting as a "change notifier", which either is iterated through 0-9 or contains a UNIX timestamp. My question is, how often can I access and read from a small (only a few bytes) file without overloading the server? The push implementation means that I can poll for changes much more often than requesting a file every few seconds, but there's still must be a limit.

如果有帮助，我正在使用1& 1 Home（Linux）托管计划，这是共享托管。

If it helps, I'm using the 1&1 Home (Linux) hosting plan, which is shared hosting.

推荐答案

假设您运行的是sane os，它将在ram中缓存更改通知程序文件，操作将如此便宜至微不足道。在此之前，PHP将成为瓶颈。

Assuming you're running a sane os which will cache the 'change notifier' file in ram, the operation would be so cheap as to insignificant. PHP would become a bottleneck way before then.

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