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

Question

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

User · Answer

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 http://aws.amazon.com/ec2/instance-types/#instance-type-matrix

vCPU Count, difference in Clock Speed and Physical Processor

User · Answer

For linuxes I ve figured out that ECU could be measured by sysbench   sysbench  --num-threads 128 --test cpu --cpu-max-prime 50000 --max-requests 50000 run  Total time  t  should be calculated by formula   ECU 1925 t  And my example test results       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

User · Answer

ECU   EC2 Compute Unit  More from here  http   aws amazon com ec2 faqs  What is an EC2 Compute Unit and why did you introduce it     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

User · Answer

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 CloudHarmony benchmarks  However  this seems gone now  and archive org can t help as it was a web application   Only an introductory blog post is still available   Also useful  ec2instances info  which at least aggregates the ECU information of different EC2 instances for comparison   Add column  Compute Units  ECU   to make it work

[amazon-web-services] What does ECU units, CPU core and memory mean when I launch a instance

Examples related to amazon-web-services

Examples related to amazon-ec2

Examples related to cloud