...时性较差。虽然可以通过加快轮询频率的方式来缓解这个问题，但相应付出的代价也不小：一来会使负载居高不下，二来也会让带宽捉襟见肘。 再来说说Long Polling，如果使用传统的LAMP技术去实现的话，大致如下所示： Long Pol...

...ller: Processes actions required to create a valid response (db operations etc.) Processor: Manages asynch communication with the web page (itself) IAsynchProcessor: The service processes instances that implement this interface Sevice: Processes request objects that implement IAsynchProcessor Reques...

...of functions that get the time right now, such as now(), unix_timestamp(), etc.; it doesn't tell you anything about what timezone the dates in the database data are using. You might choose to assume they were written using the server's timezone, but that assumption may well be flawed. To know the ti...

...自提的鲜果说，还是送菜上门的七天买菜网，都因为价格问题导致的盈利困境而歇业，价格是上门送菜的最大障碍，要么狂砸补贴，要么把量做大，维持开支，没有别的路。笔者接触过一些做上门送菜的创业者，往往会问第一个...

...同时读写可能会有IO异常,导致drbd设备失效 为了解决这个问题则使用 gfs + cman 实现分布式文件锁方案 3.3安装cman yum –y cman 3.4 gfs集群文件系统 在 /usr/local/drbd-utils-8.9.4/etc/drbd.conf 在配置文件的 net 选项中 all...

...cally use objects when working with unique things like a photo, user, post etc and use static when its meant for general things? – Robert Rocha Apr 2 '16 at 21:29 1 ...

...Thanks for digging into this and providing an explanation to why deleting /etc/nginx/sites-available/default helps with the above error. – Oliver Mar 18 '13 at 11:31 1 ...

...is a specific reason like better performance, lack of unneeded dependency, etc). – RiaD Dec 10 '15 at 17:53  |  show 9 more comments ...

微博为什么限制140字(附短信70字限制考)问题的提出申请过那么多的微博，数申请网易微博的动机最不纯，因为它的字数限制不是传说中的140字，而是163个字。当年觉得很可爱，于是就注...问题的提出 申请过那么多的微博，数申...

...函数中抛出异常，不然，我们不得不面对以下两个严重的问题： 二次异常导致程序退出; 遗留下来的未完全销毁的对象与未完成的工作导致的后续问题 pure virtual function call就是这种情况。 但是理想与现实总是有差距的，...