Feeds

Opera revs JavaScript engine of the future

It goes to eleven

Combat fraud and increase customer satisfaction

Opera is building a new JavaScript engine. And one day, the Norwegian browser mavens say, it will be the fastest the web has ever seen.

Under development for several months now, the new engine is known as Carakan, and according to private Norwegian tests, it's already two and a half times faster than the JavaScript engine woven into the recently released Opera 10 alpha.

The current engine, Futhark, was developed to minimize code footprint and memory usage. But with Carakan, Opera feels the need for raw speed. "The web is a changing environment," reads a blog post from Lars Erik Bolstad, Opera's VP of core technology. "Tomorrow's advanced web applications will require faster ECMAScript execution, so we have now taken on the challenge to once again develop the fastest ECMAScript engine on the market."

The world calls it JavaScript. But the Browserati know better.

Bolstad tells The Reg he aims to release a Carakan public build "in the next few months - before the summer, basically." It will not be rolled into Opera 10, due for an official release around the middle of the year.

Opera's core-technology team has overhauled their JavaScript - er, ECMAScript - engine in three distinct ways. For one, they've switched from a stack-based bytecode instruction set to a register-based set. Rather than using a single stack of values, Carakan stores values in fixed registers accessible by any instruction.

Since there's no need to copy values to and from the top of a stack, fewer instructions are executed and less data is copied, Bolstad explains.

Two, Carakan will compile portions of ECMAScript programs into native code. This will reduce some of the overhead required to execute certain ECMAScript code in a bytecode interpreter. The native code will look a lot like assembly code, Bolstad says, so that most of it will stay in those registers.

And three, the new engine will improve the way ECMAScript objects are represented. Each object is assigned a class that collects certain data about the object. "This representation allows compact storage of individual objects, since most of the complicated structures representing the object's properties are stored in the class, where they are shared with all other objects with the same class," Bolstad writes.

"In real-world programs with many objects of the same classes, this can save significant amounts of memory. It can be expected that most programs that do create many objects still only have a few different classes of objects."

Bolstad tells us Carakan is now "feature complete." But he and his team are still tweaking the native-code-compilation bit. Running the SunSpider benchmark, Carakan is currently two and a half times faster on ECMAScript than the Opera 10 alpha, aka Presto 2.2. With native-code generation, Bolstad expects significantly greater speed improvements. Some preliminary tests indicate that the native-code Carakan will be 5 to 50 times faster than Opera 10.

Like Opera predecessors - including Futhark, Linear A, and Linear B - the new engine shares its name with a much older breed of script. Carakan is both modern-day JavaScript engine and pre-colonial Javanese script. ®

Combat fraud and increase customer satisfaction

More from The Register

next story
Android engineer: We DIDN'T copy Apple OR follow Samsung's orders
Veep testifies for Samsung during Apple patent trial
This time it's 'Personal': new Office 365 sub covers just two devices
Redmond also brings Office into Google's back yard
Batten down the hatches, Ubuntu 14.04 LTS due in TWO DAYS
Admins dab straining server brows in advance of Trusty Tahr's long-term support landing
Microsoft lobs pre-release Windows Phone 8.1 at devs who dare
App makers can load it before anyone else, but if they do they're stuck with it
Half of Twitter's 'active users' are SILENT STALKERS
Nearly 50% have NEVER tweeted a word
Internet-of-stuff startup dumps NoSQL for ... SQL?
NoSQL taste great at first but lacks proper nutrients, says startup cloud whiz
Windows 8.1, which you probably haven't upgraded to yet, ALREADY OBSOLETE
Pre-Update versions of new Windows version will no longer support patches
Microsoft TIER SMEAR changes app prices whether devs ask or not
Some go up, some go down, Redmond goes silent
Red Hat to ship RHEL 7 release candidate with a taste of container tech
Grab 'near-final' version of next Enterprise Linux next week
Ditch the sync, paddle in the Streem: Upstart offers syncless sharing
Upload, delete and carry on sharing afterwards?
prev story

Whitepapers

Designing a defence for mobile apps
In this whitepaper learn the various considerations for defending mobile applications; from the mobile application architecture itself to the myriad testing technologies needed to properly assess mobile applications risk.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.