Feeds

Researchers find not all EC2 instances are created equal

Different Xeon and Opteron CPUs sold under same name and at same price

Next gen security for virtualised datacentres

Researchers from Deutsch Telekom Laboratories and Finland's Aalto University have claimed it is possible to detect the CPUs of servers powering at Amazon Web Services' (AWS') Elastic Compute Cloud (EC2), and that the fact the cloudy giant uses different kit in different places means users can select more powerful servers at the same cost charged for lesser hardware.

The claim has come to light in a paper titled Exploiting Hardware Heterogeneity within the Same Instance Type of Amazon EC2 (PDF) that was presented at the HotCloud event last June, but which seems to have largely gone unremarked-upon since that event.

Over the last week, however, the paper has bubbled up into the blogosphere, and is now being quite widely discussed, thanks to its finding that “... Amazon EC2 uses diversified hardware to host the same type of instance” so that an instance hosted in one AWS data centre can be faster than the same instance, sold at the same cost, in another facility.

Diversity is considerable, as the team found “the variation between the fast instances and slow instances can reach 40%. In some applications, the variation can even approach up to 60%. By selecting fast instances within the same instance type, Amazon EC2 users can acquire up to 30% of cost saving.”

The researchers say they figured this out by peering through AWS' hypervisors to identify the CPUs on the bare metal beneath. Doing so, the paper says, revealed the presence of AMD Operon and Intel Xeon processors, both with different clock speeds. The researchers were also able, thanks to their use of a longitudinal study that employed two study periods in 2011 and 2012, to detect Opteron prevalence falling in favour of newer Xeon kit. The results are depicted in the table below, which shows the different CPUs used in EC2 instances during 2011 and 2012.

AWS EC2 CPU types

That change in CPU usage was even observable at different rates in different AWS availability zones, making it possible for the savvy to aim their instances at different AWS facilities to take advantage of newer hardware. The researchers think they may also have spotted a new data centre coming online, as they spotted a facility where 95% of all CPUs were of the same type.

The paper goes on to imagine a regime in which EC2 users could, using a census of processor types across AWS' ifrastructure, create a virtual machine, interrogate it to learn what CPU powers it, and if it uses a slow CPU discard it in the likelihood of securing a faster virtual machine based on the likelihood of securing a faster CPU given the ratio of different CPUs among the data centre's server population. Even though AWS charges for an hour of computing time whenever a server is invoked, the paper asserts the extra computing power could pay for itself.

The paper does not advance a method for putting such a regime into practice, but nor does it suggest AWS would be hostile to such an effort.

A video of the HotCloud presentation can be seen here. ®

5 things you didn’t know about cloud backup

More from The Register

next story
The Return of BSOD: Does ANYONE trust Microsoft patches?
Sysadmins, you're either fighting fires or seen as incompetents now
Microsoft: Azure isn't ready for biz-critical apps … yet
Microsoft will move its own IT to the cloud to avoid $200m server bill
Oracle reveals 32-core, 10 BEEELLION-transistor SPARC M7
New chip scales to 1024 cores, 8192 threads 64 TB RAM, at speeds over 3.6GHz
Docker kicks KVM's butt in IBM tests
Big Blue finds containers are speedy, but may not have much room to improve
US regulators OK sale of IBM's x86 server biz to Lenovo
Now all that remains is for gov't offices to ban the boxes
Gartner's Special Report: Should you believe the hype?
Enough hot air to carry a balloon to the Moon
Flash could be CHEAPER than SAS DISK? Come off it, NetApp
Stats analysis reckons we'll hit that point in just three years
Dell The Man shrieks: 'We've got a Bitcoin order, we've got a Bitcoin order'
$50k of PowerEdge servers? That'll be 85 coins in digi-dosh
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
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.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.