Feeds

AWS bins elastic compute units, adopts virtual CPUs

Customers tired of wrapping their heads around odd computing power metric

Application security programs and practises

Gartner analyst Kyle Hilgendorf has spotted something very interesting: Amazon Web Services seems to have stopped rating cloud servers based on EC2 compute units (ECUs), its proprietary metric of computing power.

ECUs were an odd metric, as they were based on “... the equivalent CPU capacity of a 1.0-1.2 GHz 2007 Opteron or 2007 Xeon processor … equivalent to an early-2006 1.7 GHz Xeon”. AWS rated EC2 instances according to the number of ECUs they employed.

Hilgendorf's blog post links to this AWS page describing EC2 instances ad offering only vCPUs. But a trip into archive.org's record of the page as it appeared on April 13 shows that AWS used to sell both Virtual CPUS (vCPUs) and ECUs.

AWS has confirmed the change has taken place to The Register.

The EC2 FAQ spells it out. Emphases are AWS' own:

Q: Why don’t I see EC2 Compute Units, or ECUs, any more?

Elastic Compute Units have been replaced with processor information and clock speed.

Q: Why did you replace the ECU measurements?

We replaced the ECU measurements in order to provide a more standardized comparison method between instance types. We try to provide measurements that are easy to understand, and more universal.

Hilgendorf writes that the ECU “was always a gnarly concept to grasp".

The Reg understands that AWS customers shared very similar sentiments on a regular basis. Rather than try to educate customers about its odd metric, AWS has simply decided to adopt the far-more-easily-understood and widely-adopted vCPU moniker.

As it transpires, the cloudy colossus foreshadowed it might one day move away from ECUs. In this FAQ it says “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.”

vCPUs are clearly that “clearer” description, and as of now they're AWS' standard way for describing the engines in its rent-a-servers.

®

Eight steps to building an HP BladeSystem

More from The Register

next story
Sysadmin Day 2014: Quick, there's still time to get the beers in
He walked over the broken glass, killed the thugs... and er... reconnected the cables*
SHOCK and AWS: The fall of Amazon's deflationary cloud
Just as Jeff Bezos did to books and CDs, Amazon's rivals are now doing to it
Amazon Reveals One Weird Trick: A Loss On Almost $20bn In Sales
Investors really hate it: Share price plunge as growth SLOWS in key AWS division
US judge: YES, cops or feds so can slurp an ENTIRE Gmail account
Crooks don't have folders labelled 'drug records', opines NY beak
Auntie remains MYSTIFIED by that weekend BBC iPlayer and website outage
Still doing 'forensics' on the caching layer – Beeb digi wonk
Manic malware Mayhem spreads through Linux, FreeBSD web servers
And how Google could cripple infection rate in a second
BlackBerry: Toss the server, mate... BES is in the CLOUD now
BlackBerry Enterprise Services takes aim at SMEs - but there's a catch
The triumph of VVOL: Everyone's jumping into bed with VMware
'Bandwagon'? Yes, we're on it and so what, say big dogs
prev story

Whitepapers

Top three mobile application threats
Prevent sensitive data leakage over insecure channels or stolen mobile devices.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.