bluehost CPU限制宽松了至少一倍

昨天还在和ishawn谈论到这个问题，他一直在怀疑bluehost是否因为用户的抱怨而取消了CPU限制，所以他反问问我是不是有很久没有看到CPU超标的提示了？仔细一回忆，还真确实很久没有看到CPU超标了.不过说实话，如果虚拟主机取消了CPU限制，未必是一件好事.因为这样必将会因为大量共享用户过多的占用资源而导致系统的不稳定.

今天我特意的去看了看bluehostCEO的blog,从而获得了两个信息:1.hostmonster和bluehost是一家这是肯定没错的（Bluehost.com and Hostmonster.com have a CPU quota limit in place to try and mitigate the server problems that a single user or a small set of users can create.）；2.bluehost的CPU限制并没有取消，而是放宽了，这个是本人关注的重点。

Effective immediately (Actually as of Friday January 25th) we have altered the way we calculate CPU usage. Each user’s cap is now approximately double what we had it set to previously. Many users have complained lately that our cpu quotas were overly restrictive. I believe these changes should reduce the number of people that run into this problem by about 90%. We will continue to tweak our settings to stop only the most abusive of users on the system. This was never meant as a way to limit functionality, but rather a way to guarantee resources for servers that are shared by many users.

在他的blog中说，由于以前的CPU限制是很早就定下来的，因为那个时候服务器只有一个或者两个CPU核，所以对CPU使用时间计算得比较严格。但是现在他们的服务器至少都是8核的CPU，所以以前的计算方法就不再适用了，于是他们（bluehost和hostmonster）改变了CPU使用时间的计算方式，按照当前的计算方式，CPU的限制时间至少提高了一倍，而这一倍至少可以让90%的超标用户不会再出现超标的困扰了。与其错误的认为CPU的限制是在对服务器的功能做了限制，不如说它的存在是为了更好的保证其他共享用户的稳定，当然，同时CPU的限制也是服务器稳定运行的一个必要条件，至少对于我自己来说，哪一天如果bluehost彻底取消了CPU限制，我宁愿搬家到其他新的host上去。