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Submission + - Collaborative Mathematics with SageMathCloud and Google Cloud Platform (

phatsphere writes: Craig Citro, Software Engineer at Google, blogs about SageMathCloud:

In an attempt to create an open source tool to satisfy these requirements, University of Washington Professor William Stein built SageMathCloud (or SMC). SMC is a robust, low-latency web application for collaboratively editing mathematical documents and code. This makes SMC a viable platform for mathematics research, as well as a powerful tool for teaching any mathematically-oriented course.

SMC features enhanced IPython Notebooks and Sage Worksheets in a full Linux environment with real-time collaboration and continuous backup.

Submission + - SageMathCloud's new Storage Architecture (

phatsphere writes: William Stein summarizes his experience of creating a highly scalable, continuously backuped and replicated storage infrastructure for SMC, based on ZFS, bup, rsync & co:

Consistency and availability are competing requirements. It is trivial to keep the files in a SageMathCloud project consistent if we store it in exactly one place; however, when the machine that project is on goes down for any reason, the project stops working, [...]. By making many copies of the files in a project, it's fairly easy to ensure that the project is always available, even if network switches in multiple data centers completely fail, etc. Unfortunately, if there are too many users and the synchronization itself puts too heavy of a load on the overall system, then machines will fail more frequently, and though projects are available, files do not stay consistent and data is lost to the user.

and boldly summarizes

The architecture that we have built could scale up to a million users.

Comment Re:This was shocking to me (Score 2, Informative) 188

somewhere is a rather long explanation about their hardware - on youtube ^^ gigabyte built customized mainboards for them. optimized for speed, and either a lot of ram or a lot of harddisks - and no graphics, sound or other silly things. they do UPS right on the board (top boxes in picture 2) and yes, i think it's cheaper. they might fail more often, but they can repair and reuse them!! everything is their hands and they have full control!
The Internet

Submission + - Using the Earth to Cool Your Data Center (

1sockchuck writes: "With data centers using enormous amounts of electricity, some companies are using the earth to reduce their power bills. Prairie Bunkers plans to use geothermal cooling in a Nebraska project that will convert former World War II ammo bunkers into data centers. This follows news that an Iowa data center used geothermal cooling to achieve the highest rating possible for energy-efficient buildings. Geothermal cooling uses vertical wells housing closed-loop piping systems filled with water or coolant. The cool earth allows the underground piping system to serve as a heat exchanger."
The Internet

Submission + - UK Officially Proposes to Cut-Off Internet Pirates (

MJackson writes: "The UK government has officially proposed an amendment to its Digital Britain report, which would include the controversial measure of suspending illegal file sharers from their ISP. The disconnection proposal was originally ruled out in favour of letter warnings and technical measures (service speed reductions, website blocks etc.). That followed several years of largely unproductive wrangling between consumer groups, ISPs and Rights Holders. Law firms currently track suspected illegal P2P activity by monitoring IP addresses, which are assigned to every computer when you go online, yet IP's can easily be spoofed, redirected, shared over big networks or even hijacked (open Wi-Fi etc.). The download itself could also be encrypted, making it nearly impossible for the ISP to verify; but of course the UK has ignored all that."

Comment hp 2140 netbook experience (Score 1) 833

i got a hp 2140 and well, they (hp) put suse sled 10 on it. it was terrible slow, old software, and even the webcam didn't work! then i tried ubuntu's netbook remix based on upcoming jaunty. well, it was much faster, up to date software, webcam and everything else worked. wlan connected much faster (took up to 2 min on sled 10) only problem: the kernel (2.6.28) can't boot if the DC power is plugged! i really want linux since i only use linux, but it is a bit hard to go mainstream based on such a level of quality... preinstalled linux is horrible and the more recent software has bugs.

Comment gnome better than kde (Score 1) 455

spoiler, i'm a gnome fan, but not only because it is simple and i don't have to think about how to use it (after about 10 years of linux experience i want to focus on other things than silly desktop effects). I recently got kde 4.1 here at my office and the first thing which was really annoying is, that the "Dolphin" file manager eats about 200mb of ram almost instantly. That's simply not acceptable and is only the tip of the iceberg. At gnome, things are reduced to fit their purposes, repsond faster, eat less resources. Therefore i think, kde has a really long way to go and I don't think that gnome's gradual way has any problems for the next years... Netbooks and web-applications will demand new features and gnome is well prepared.

Comment Re:conspiracy theories (Score 1) 234

Google really wanted to "rescue" Yahoo?

back before 2000, google was choosen as the search results provider vor yahoo. they helped google, now they want to give back. this deal wasn't about google gets yahoo,just about showing ads along a page, only bottom right iirc, and nothing more - for their mutual benefit. (i.e. yahoo doesn't have the technology to show ads for the long tail of less important keywords and therefore less ads to display)

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