Author Archives: Chris Samuel

Vacation 1.2.7.0 beta 4 released

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This beta release updates the build process to remove the -m486 flag on non-PPC systems as the distros are already doing this.

This may break backwards compatibility on AMD64/EM64T based systems, the fix is to run vacation -I to reinitialise your database of addresses you have received email from.

The option ‘-i’ has been added as an alias for ‘-I’ and documented in the manual page.

This release includes the Makefile changes from Marshal Newrock to build (hopefully) on FreeBSD with automatic detection of whether it is necessary.

There have been a few other housekeeping changes.

Please report any problems!

SourceForge has both the released sources and the ChangeLog.

Dell to ship Ubuntu Linux

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Dell have announced they will sell systems bundled with Ubuntu 7.04 (Feisty Fawn), though the details are yet to be announced. Here’s hoping that this time they escape beyond the USA (hello Dell, there is a world outside the US!). There’s also a report on the BBC, which is where I first saw this mentioned.

On the Direct2Dell page that announces this there is a video interview with Mark Shuttleworth of Canonical in a variety of formats, including the free Theora codec. Props to Dell for including that.

If this gets to Australia I suspect my next laptop will be ones of these Dell’s (as long as they have a model with an Intel graphics card).

A Rough Guide to Scientific Computing On the Playstation 3

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Eugen Leitl has just posted on the Beowulf list a message with a link to a draft of a paper by Alfredo Buttari, Piotr Luszczek, Jakub Kurzak, Jack Dongarra and George Bosilca called A Rough Guide to Scientific Computing On the Playstation 3. It’s a 74 page PDF looking at the possibilities and problems with using the PS3 for scientific computing (there is already a PS3 Linux cluster at NCSU).

The introduction to the paper lets you know that this isn’t going to be easy..

As exciting as it may sound, using the PS3 for scientific computing is a bumpy ride. Parallel programming models for multi-core processors are in their infancy, and standardized APIs are not even on the horizon. As a result, presently, only hand-written code fully exploits the hardware capabilities of the CELL processor. Ultimately, the suitability of the PS3 platform for scientific computing is most heavily impaired by the devastating disproportion between the processing power of the processor and the crippling slowness of the interconnect, explained in detail in section 9.1. Nevertheless, the CELL processor is a revolutionary chip, delivering ground-breaking performance and now available in an affordable package. We hope that this rough guide will make the ride slightly less bumpy.

Of course, it’s unlikely you’re going to see the PS3 being used in production clusters anyway, so the interconnect shouldn’t be such a problem there.. 🙂

The paper covers the hardware, Linux support and how to get it onto a PS3, programming methods and models, MPI, performance, etc. The paper isn’t complete as I write, but it is still a very interesting read. HPC folks will certainly want to read section 9.1 “Limitations of the PS 3 for Scientific Computing”, especially the part that says:

Double precision performance. Peak performance of double precision floating point arithmetic is a factor of 14 below the peak performance of single precision. Computations which demand full precision accuracy will see a peak performance of only 14 Gflop/s, unless mixed-precision approaches can be applied.

Welcome to WordPress, Russell!

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Russell Coker, SELinux developer, Bonnie++ maintainer and fellow LUV person has now switched from Blogger to his own WordPress installation, which makes leaving comments a hell of a lot easier! 🙂

He’s also now got a blog on “random things that are large or of limited interest“, though why that isn’t just a category on his main site (and using WordPress’s handy “more” marker to stop the whole thing showing up on the front page) I’m not sure.

Anyway, welcome to WordPress Russell!

Compare and Contrast – Pre-entrance Chinese University Question and First Year UK University Question

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For anyone who doubts that graduates in China are going to be more than a match for the rest of the world, go and read this BBC news article comparing a maths question set to first year chemistry students in the UK with a maths question that is set to students wishing to enter university in China.

The Royal Society of Chemistry in the UK is running a competition offering a GBP500 prize to a winner who can correctly answer the question from China. This is because of their concerns about the poor level of mathematics that Chemistry students in the UK have:

Increasingly, universities are mounting remedial sessions for incoming science undergraduates because their maths skills are so limited, with many having stopped formal lessons in mathematics two years earlier at the GCSE level.