blocks|key|2407219|text|ECU+=+EC2计算单元更多信息来自这里：它|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2407220|Amazon+EC2使用各种方法为每个实例提供一致和可预测的CPU容量。为了便于开发人员比较不同实例类型之间的CPU容量，我们定义了一个Amazon计算单元(+EC2+Compute+)。分配给特定实例的CPU数量以这些EC2计算单元表示。我们使用几个基准和测试来管理来自EC2计算单元的性能的一致性和可预测性。一个EC2计算单元提供相当于1.2-1.2+GHz+2007+Opteron或2007+Xeon处理器的CPU容量。这也相当于我们的原始文档中引用的2006年初1.7+GHz+Xeon处理器。随着时间的推移，我们可能会添加或替代EC2计算单元的定义中的度量，如果我们找到能够更清晰地描述计算能力的度量标准的话。|blockquote|2407221|entityMap|0|LINK|mutability|MUTABLE|url|http://aws.amazon.com/ec2/faqs/#What_is_an_EC2_Compute_Unit_and_why_did_you_introduce_it^0|M|1|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@$A|P|B|Q|1|R]]|C|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|C|$]]|$1|G|3|-4|5|6|7|T|8|@]|9|@]|C|$]]]|H|$I|$5|J|K|L|C|$M|N]]]]

ECU = EC2 Compute Unit. More from here: <a href="http://aws.amazon.com/ec2/faqs/#What_is_an_EC2_Compute_Unit_and_why_did_you_introduce_it">http://aws.amazon.com/ec2/faqs/#What_is_an_EC2_Compute_Unit_and_why_did_you_introduce_it</a>

<blockquote>
 Amazon EC2 uses a variety of measures to provide each instance with a consistent and predictable amount of CPU capacity. In order to make it easy for developers to compare CPU capacity between different instance types, we have defined an Amazon EC2 Compute Unit. 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. Over time, we may add or substitute measures that go into the definition of an EC2 Compute Unit, if we find metrics that will give you a clearer picture of compute capacity.
</blockquote>

blocks|key|241748|text|ECU+(EC2+Computer+Unit)是亚马逊引入的处理器性能的粗略度量，它允许您比较它们的EC2实例(“服务器”)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|241749|CPU性能当然是一个多维度量，因此在其上放置一个数字(如"5+ECU")只能是一个粗略的近似。如果您想更准确地了解处理器对您心目中的任务执行得有多好，您应该选择一个与您的任务类似的基准。|241750|2014年初，在CloudHarmony基准上有一个比较好的基准站点，比较了数十个不同基准的云托管服务。然而，这一点现在似乎已经消失了(而且archive.org无法帮助它，因为它是一个web应用程序)。只有博客介绍性文章仍然可用。|offset|length|241751|同样有用的是：ec2instances.info，它至少聚合不同EC2实例的ECU信息以供比较。(添加列“计算单元(ECU)”以使其工作。)|241752|entityMap|0|LINK|mutability|MUTABLE|url|http://cloudharmony.com/benchmarks|1|http://blog.cloudharmony.com/2010/05/what-is-ecu-cpu-benchmarking-in-cloud.html|2|http://www.ec2instances.info/^0|0|0|8|E|0|2W|7|1|0|7|H|2|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$F|Y|G|Z|1|10]|$F|11|G|12|1|13]]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@$F|15|G|16|1|17]]|A|$]]|$1|J|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]|T|$5|M|N|O|A|$P|U]]]]

ECUs (EC2 Computer Units) are a rough measure of processor performance that was introduced by Amazon to let you compare their EC2 instances ("servers").

CPU performance is of course a multi-dimensional measure, so putting a single number on it (like "5 ECU") can only be a rough approximation. If you want to know more exactly how well a processor performs for a task you have in mind, you should choose a benchmark that is similar to your task.

In early 2014, there was a nice benchmarking site comparing cloud hosting offers by tens of different benchmarks, over at <a href="http://cloudharmony.com/benchmarks" rel="noreferrer">CloudHarmony benchmarks</a>. However, this seems gone now (and archive.org can't help as it was a web application). Only an <a href="http://blog.cloudharmony.com/2010/05/what-is-ecu-cpu-benchmarking-in-cloud.html" rel="noreferrer">introductory blog post</a> is still available.

Also useful: <a href="http://www.ec2instances.info/" rel="noreferrer">ec2instances.info</a>, which at least aggregates the ECU information of different EC2 instances for comparison. (Add column "Compute Units (ECU)" to make it work.)

blocks|key|2407278|text|响应论坛线程是为了完整。亚马逊已经停止使用ECU+-弹性计算单元，转而使用基于vCPU的度量。因此，忽略ECU，您可以开始比较EC2实例的大小，如CPU+(时钟速度)、CPU数量、内存、存储等。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2407279|每个实例家族的实例配置都以vCPU的数量和物理处理器的数量发布。从这里看到的详细信息和屏幕截图http://aws.amazon.com/ec2/instance-types/#instance-type-matrix|2407280|​|2407281|📷|atomic|2407282|2407283|entityMap|0|LINK|mutability|MUTABLE|url|http://aws.amazon.com/ec2/instance-types/#instance-type-matrix|1|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/06806d9aa4399932cbc1553f7f05648a.png|imageAlt^0|L|3|13|4|0|1B|1Q|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|H|3|I|5|6|7|1A|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|M|3|I|5|6|7|1F|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]|V|$5|W|R|X|E|$Y|Z|10|-4]]]]

Responding to the Forum Thread for the sake of completeness. Amazon has stopped using the the ECU - Elastic Compute Units and moved on to a vCPU based measure. So ignoring the ECU you pretty much can start comparing the EC2 Instances' sizes as CPU (Clock Speed), number of CPUs, RAM, storage etc.

Every instance families' instance configurations are published as number of vCPU and what is the physical processor. Detailed info and screenshot obstained from here <a href="http://aws.amazon.com/ec2/instance-types/#instance-type-matrix">http://aws.amazon.com/ec2/instance-types/#instance-type-matrix</a>

<img src="https://i.stack.imgur.com/iEsbU.png" alt="vCPU Count, difference in Clock Speed and Physical Processor">

blocks|key|241806|text|对于linuxes，我已经发现可以用sysbench来测量ECU：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|241807|sysbench++--num-threads=128+--test=cpu+--cpu-max-prime=50000+--max-requests=50000+run|offset|length|style|CODE|241808|总时间(t)应按公式计算：|241809|ECU=1925/t|241810|我的例子测试结果：|241811|%7C+++instance+type+++%7C+++time+++%7C+++ECU+++%7C
%7C-------------------%7C----------%7C---------%7C
%7C+m1.small++++++++++%7C++1735,62+%7C+++++++1+%7C
%7C+m3.xlarge+++++++++%7C+++147,62+%7C++++++13+%7C
%7C+m3.2xlarge++++++++%7C++++74,61+%7C++++++26+%7C
%7C+r3.large++++++++++%7C+++295,84+%7C+++++++7+%7C
%7C+r3.xlarge+++++++++%7C+++148,18+%7C++++++13+%7C
%7C+m4.xlarge+++++++++%7C+++146,71+%7C++++++13+%7C
%7C+m4.2xlarge++++++++%7C++++73,69+%7C++++++26+%7C
%7C+c4.xlarge+++++++++%7C+++123,59+%7C++++++16+%7C
%7C+c4.2xlarge++++++++%7C++++61,91+%7C++++++31+%7C
%7C+c4.4xlarge++++++++%7C++++31,14+%7C++++++62+%7C|code-block|syntax|javascript|241812|entityMap^0|0|0|2D|0|0|0|A|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|12|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|13|8|@]|9|@]|A|$Q|R]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

For linuxes I've figured out that ECU could be measured by sysbench:

<code>sysbench --num-threads=128 --test=cpu --cpu-max-prime=50000 --max-requests=50000 run</code>

Total time (t) should be calculated by formula:

<code>ECU=1925/t</code>

And my example test results:

<pre><code>| instance type | time | ECU |
|-------------------|----------|---------|
| m1.small | 1735,62 | 1 |
| m3.xlarge | 147,62 | 13 |
| m3.2xlarge | 74,61 | 26 |
| r3.large | 295,84 | 7 |
| r3.xlarge | 148,18 | 13 |
| m4.xlarge | 146,71 | 13 |
| m4.2xlarge | 73,69 | 26 |
| c4.xlarge | 123,59 | 16 |
| c4.2xlarge | 61,91 | 31 |
| c4.4xlarge | 31,14 | 62 |
</code></pre>

When I launch an instance on EC2, it gives me option for t1.micro, m1.small, m1.large etc. There is a comparision chart of vCPU, ECU, CPU cores, Memory, Instance store. Is this memory RAM of a system ? 

<img src="https://i.stack.imgur.com/k407N.png" alt="enter image description here">

I am not able to understand what all these terms refer to, can anyone give me a clear picture of what these terms mean ?

What does ECU units, CPU core and memory mean when I launch a instance

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我在EC2上启动一个实例时，它给了我t1.microm1.size、m1.large等的选项。有一个vCPU、ECU、CPU内核、内存、实例存储的比较图。这是系统的内存吗？​​我无法理解所有这些术语所指的是什么，谁能给我一个清楚的画面，这些术语意味着什么？

问当我启动一个实例时，ECU单元、CPU核心和内存意味着什么？
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问当我启动一个实例时，ECU单元、CPU核心和内存意味着什么？EN