亚马逊衡量虚拟内核和EC2计算单元方面它们的CPU分配。 EC2计算单元被定义为：
Amazon measures their CPU allotment in terms of virtual cores and EC2 Compute Units. EC2 Compute Units are defined as:
的CPU分配给一个特定的实例中的量是pssed在这些EC2计算单元计前$ P $。我们使用多种基准和测试来管理从一个EC2计算单元性能的一致性和predictability。一个EC2计算单元提供了一个1.0-1.2 GHz的皓龙2007或2007至强处理器相当于CPU的能力。这也相当于我们的原始文件中引用的早2006年1.7 GHz的至强处理器。
The amount of CPU that is allocated to a particular instance is expressed in terms of these EC2 Compute Units. We use several benchmarks and tests to manage the consistency and predictability of the performance from an EC2 Compute Unit. One EC2 Compute Unit provides the equivalent CPU capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor. This is also the equivalent to an early-2006 1.7 GHz Xeon processor referenced in our original documentation.
我的问题是，说我有一个大实例，它配备了4个EC2计算单位（2个虚拟内核，每个2个EC2计算单元）。这是否意味着我基本上有4个核心在逻辑意义？我想产卵4 CPU绑定的主题？或者是计算单元只是力量的措施，我有2个内核？
My question is, say I have a "Large Instance" which comes with "4 EC2 Compute Units (2 virtual cores with 2 EC2 Compute Units each)". Does this mean I essentially have 4 cores in a logical sense? Would I want to spawn 4 CPU-bound threads? Or are the compute units simply a measure of power, and I have 2 cores?
此外，考虑到服务器的可扩展性，将是更好的两倍单箱的计算能力和承载在同一机器中的数据库和服务器？或者我应该有2个独立的，弱的盒子？
Also, given the scalability of the servers, would it be better to double the computing power of a single box and host the database and server on the same box? Or should I have 2 seperate, weaker boxes?
推荐答案
nicholaides是正确的，则小实例是一个芯的等效，大两个核心。在测量的剩余部分pssed为计算单位，其定义EX $ P $如下：
nicholaides is correct, the small instances are the equivalent of one core, the large two cores. The remainder of the measurement is expressed as Compute Units, which are defined as follows:
一个EC2计算单元（ECU）提供 的一个的等效CPU容量 1.0-1.2 GHz的皓龙2007或2007至强处理器。
One EC2 Compute Unit (ECU) provides the equivalent CPU capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor.
我跑href="http://www.sunsetlakesoftware.com/">我的小网站在一个小实例，既Web服务器和数据库托管一个虚拟机上
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