使Apache的响应时间日志指令的性能的影响 [英] Performance effect of enabling apache response time log directive

问题描述

什么影响将会使响应时间（％D）LogFormat指令对Apache的性能？

What affect will enabling the response time (%D) LogFormat directive have on apache performance?

的响应时间是服务于微秒的请求所花费的时间。

The response time is the time taken to serve a request in microseconds.

响应时间可以像这样被启用：

Response time can be enabled like so:

#LogFormat "%h %l %u %t \"%r\" %>s %b"    # Default LogFormat
LogFormat "%h %l %u %t \"%r\" %>s %b %D"  # LogFormat including response time

我已经写了监测和分析后端脚本性能的工具，
Apache的响应时间，这就要求响应时间数据。我想提醒潜在用户如何启用这个指令将影响Apache服务器的性能。

I have written a tool for monitoring and analysing backend script performance, apache-response-time, which requires response time data. I would like to warn potential users how enabling this directive will affect apache server performance.

推荐答案

也许不值得考虑的HTTP响应方面 - 只有1 ADDL的gettimeofday（）调用（和几个函数调用）的开销，所以东西的顺序几微秒。阿帕奇已经注意到同样的事情时请求到达。

Probably not worth considering in terms of HTTP responses -- only the overhead of 1 addl gettimeofday() call (and a few function calls) so something on the order of a few microseconds. Apache already notes the same thing when the request arrives.

<一个href=\"http://www.atl.lmco.com/projects/QoS/POSIX_html/index.html\">http://www.atl.lmco.com/projects/QoS/POSIX_html/index.html列出gettimeofday的一些老微基准（）本身。

http://www.atl.lmco.com/projects/QoS/POSIX_html/index.html lists some old microbenchmarks of gettimeofday() itself.

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