Feeds

Boffin calculates pi to 2.7 trillion digits

On a humble desktop PC

  • alert
  • submit to reddit

Boost IT visibility and business value

Computer scientist Fabrice Bellard says he's calculated pi to a whopping 2.7 trillion digits - a Herculean task which took a humble desktop PC 131 days.

According to the BBC, the previous record of 2.6 trillion digits was held by Daisuke Takahashi of Japan's University of Tsukuba. That number-crunching exercise took just 29 hours, albeit on a T2K Open Supercomputer "2,000 times faster and thousands of times more expensive" than Bellard's bog-standard kit which cost "less than 2000 euros".

The Beeb explains that such exercises are known as "arbitrary-precision arithmetic", or "bignum arithmetic", wherein rather large numbers are calculated to a precision of digits limited only by the computer system's available memory.

In this case, pi to 2.7 trillion digits requires "over a terabyte" of disk storage space and is so long that if you fancy reciting one number a second, you'd be done in 49,000 years.

Bellard admitted he's "not especially interested in the digits of pi" and that "arbitrary-precision arithmetic with huge numbers has little practical use", although "some of the involved algorithms are interesting to do other things".

Ivars Peterson, director of publications at the Mathematical Association of America, explained to the BBC that an exceedingly long pi did indeed serve some purpose. He said: "People have used it as a vehicle for testing algorithms and for testing computers; pi has a precise sequence of digits, it's exactly that, and if your computer isn't operating flawlessly some of those digits will be wrong.

He concluded: "It's more than just for the fun of it - pi is a way of testing a method and then the method can be used for other purposes." ®

Bootnote

Bellard says he's planning to release Linux and Windows (64 bit only) versions of the program he used to do the calculation, and here's his kit list should you wish to give it a go:

Core i7 CPU at 2.93 GHz
6 GB of RAM
7.5 TB of disk storage using five 1.5 TB hard disks (Seagate Barracuda 7200.11 model)

Bellard notes: "The Linux Operating System was used with the 64 bit Red Hat Fedora 10 distribution. The 7.5 TB disk storage was managed using software RAID-0 and the ext4 filesystem. Files of up to 2.5 TB were manipulated during the computation."

Gartner critical capabilities for enterprise endpoint backup

More from The Register

next story
LOHAN packs bags for SPACEPORT AMERICA!
Spanish launch goes titsup, we're off to the US of A
Gigantic toothless 'DRAGONS' dominated Earth's early skies
Gummy pterosaurs outlived toothy competitors
'Leccy racer whacks petrols in Oz race
ELMOFO rakes in two wins in sanctioned race
Boffins ID freakish spine-smothered prehistoric critter: The CLAW gave it away
Bizarre-looking creature actually related to velvet worms
CRR-CRRRK, beep, beep: Mars space truck backs out of slippery sand trap
Curiosity finds new drilling target after course correction
Astronomers scramble for obs on new comet
Amateur gets fifth confirmed discovery
Boffins build CYBORG-MOTHRA but not for evil: For search & rescue
This tiny bio-bot will chew through your clothes then save your life
Vulture 2 takes a battering in 100km/h test run
Still in one piece, but we're going to need MORE POWER
What does a flashmob of 1,024 robots look like? Just like this
Sorry, Harvard, did you say kilobots or KILLER BOTS?
prev story

Whitepapers

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.
7 Elements of Radically Simple OS Migration
Avoid the typical headaches of OS migration during your next project by learning about 7 elements of radically simple OS migration.
BYOD's dark side: Data protection
An endpoint data protection solution that adds value to the user and the organization so it can protect itself from data loss as well as leverage corporate data.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?