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php fastcgi的优势

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Jun 23, 2016 pm 02:31 PM

简介：这是php fastcgi的优势的详细页面，介绍了和php,fcgi, cgi, fork, php php fastcgi的优势有关的知识、技巧、经验，和一些php源码等。

class='pingjiaF' frameborder='0' src='http://biancheng.dnbcw.info/pingjia.php?id=357913' scrolling='no'> FCGI优势：
1 不用对于每个请求都fork一次，别小看这个fork，对于访问量非常大的某个逻辑，你用CGI，会造成系统fork大量的进程。进程过多了有会造成切换，开销不小。
2 FCGI初始化操作不用对每个请求都进行。有时候你的业务逻辑需要连接某个服务器，查询数据，如果查询非常频繁，用FCGI的话可以建立个长连接。用CGI的话，每次建立一个连接，无论是服务器端主动关闭连接还是CGI关闭连接，都会造成一定数量的TIME_WAIT连接。

FCGI劣势：
1 如果你的程序实现某个地方有问题，比如内存小泄露，久而久之所占的内存会很大，CGI不会有这个问题。为了避免诸如此类的问题，很多人喜欢在FCGI处理一定数量的请求后自动exit。
2 FCGI常驻内存，多少占点内存空间。

总之，看需要选择，如果访问量大到一定程序，CGI是支持不住的时候或者业务逻辑要求常驻内存的服务，用FCGI，否则，能够用CGI就用CGI吧。

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