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HomeBackend DevelopmentPHP Tutorial关于并发请求咨询一下


   用户              页面
1、a1-a10000  同时访问   /a1.htm
2、b1         同时访问   /b1.htm  /b2.htm   ...   /b10000.htm

解释:
1、10000个用户 同时 请求 1个页面
2、1个用户     同时 请求 10000个页面


请问这2种  对服务器压力是一样的吗?还是哪个更快?


回复讨论(解决方案)

看你是什么页面,如果是动态页面,通常来说服务器是有缓存的,比如1个PHP页面,是需要编译的,编译好后有缓存,并发的话相当于只编译一次,而你10000个不同页面这地方开销是1个的1W倍。
还有就是看你页面内容,页面大小不同开销也不同,图片多少也是不同开销,等等其他很多方面,不过基本情况是1个页面比10000个页面压力小点。

如果 1个用户同时请求10000个页面 这种情况是存在的话(应该是不存在的)
两者的开销对于服务器而言是一样的!

看你是什么页面,如果是动态页面,通常来说服务器是有缓存的,比如1个PHP页面,是需要编译的,编译好后有缓存,并发的话相当于只编译一次,而你10000个不同页面这地方开销是1个的1W倍。
还有就是看你页面内容,页面大小不同开销也不同,图片多少也是不同开销,等等其他很多方面,不过基本情况是1个页面比10000个页面压力小点。

假设:这2者都没有缓存,是htm的。 这1个页面 和10000个页面的大小是相同的(内容不同)
那这样的话是1比2快吗(1W用户访问1个页面  比 1个用户访问1W页面)

如果 1个用户同时请求10000个页面 这种情况是存在的话(应该是不存在的)
两者的开销对于服务器而言是一样的!

哦。我也是这样理解的。但有的人说是。

一个用户发1万次请求,也是1个session。
1万个用户发一次请求,是10000个session。
session会在服务器存留很长时间(根据设置,一般是30分钟)

这又有什么关系呢?

他在CSDN好象排名很高。
他是认为,1比2快(也就是单用户10000次请求会很快。 10000用户同时1次请求会很慢),所以黑客都是用多用户IP攻击请求网站。

我不是很解啊,难道是多IP请求的时候,WEB服务器(如APACHE)要生成1W个IP(SESSION吗?) 所以就慢?

我先这样理解吧。谢谢!
10000用户同时请求1次,耗用的系统资源 = 1用户同时请求10000次,耗用的系统资源


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