Slashdot.org was unreachable for about 75 minutes this evening. Here is the post-mortem from Sourceforge's chief network engineer Uriah Welcome. "What we had was indeed a DoS, however it was not externally originating. At 8:55 PM EST I received a call saying things were horked, at the same time I had also noticed things were not happy. After fighting with our external management servers to login I finally was able to get in and start looking at traffic. What I saw was a massive amount of traffic going across the core switches; by massive I mean 40 Gbit/sec. After further investigation, I was able to eliminate anything outside our network as the cause, as the incoming ports from Savvis showed very little traffic. So I started poking around on the internal switch ports. While I was doing that I kept having timeouts and problems with the core switches. After looking at the logs on each of the core switches they were complaining about being out of CPU, the error message was actually something to do with multicast. As a precautionary measure I rebooted each core just to make sure it wasn't anything silly. After the cores came back online they instantly went back to 100% fabric CPU usage and started shedding connections again. So slowly I started going through all the switch ports on the cores, trying to isolate where the traffic was originating. The problem was all the cabinet switches were showing 10 Gbit/sec of traffic, making it very hard to isolate. Through the process of elimination I was finally able to isolate the problem down to a pair of switches... After shutting the downlink ports to those switches off, the network recovered and everything came back. I fully believe the switches in that cabinet are still sitting there attempting to send 20Gbit/sec of traffic out trying to do something — I just don't know what yet. Luckily we don't have any machines deployed on [that row in that cabinet] yet so no machines are offline. The network came back up around 10:10 PM EST."

GamerDNA is trying out what they call their Discovery Engine, a system that uses metadata from users to classify games and identify which have similar traits. Massively describes it thus: "Once the gamerDNA community continues to contribute to something like this, it builds up an enormous database of terminology based on actual player knowledge, not just shiny PR words thrown together to promote a game. These search terms can end up being unique to a specific genre, and ultimately lead gamers to exactly the types of games they're looking for." GamerDNA tested the system out on some of the popular MMOs, and they've posted the results. They look at how MMO players identify themselves within the game, how they describe the setting, and what basic descriptive phrases they use in reference to the games.

Arlen writes "As many as 17,000 people (according to police estimates) watched Senator Barack Obama officially announce his candidacy for President in Springfield, Illinois today. He mentioned several things that will interest readers of Slashdot. The Senator said he wanted to free America from 'the tyranny of oil' and went on to promote alternative energy sources such as ethanol — a popular stance in the Midwest where he announced, because of all the corn farmers. He also talked about using science and technology to help those with chronic diseases, which is likely to have been an allusion to his staunch support for stem cell research. Perhaps most of interest to readers here is the following statement halfway through Obama's speech: 'Let's invest in scientific research, and let's lay down broadband lines through the heart of inner cities and rural towns all across America. We can do that.' Like nearly everything in his speech, this was met with robust applause from the crowd. You can watch a video of the entire speech at Obama's website."

Nuclear Elephant writes "The Consumerist is running a story about a house burned down by a Dell laptop. 'My 130-year-old former farm house was engulfed in flames, with thick dark smoke pouring out of the windows and roof... Hours later, after investigation the fire marshal investigator took me aside asked me if I had a laptop computer. Yes — I told him I had a Dell Inspiron 1200.' It was determined that the laptop, battery, or cord malfunctioned after its owner left for work, leaving the fire to spread through the entire house. All attempts to contact Dell have failed. 'I have tried to call Dell to at least notify them of my problems, but each time I have called I get transferred into an endless loop of "Joe" or "Alan" all speaking a delectable version of English I presume emanates from Bangalore. I have been outright hung up on each time I get someone who speaks a reasonable version of English, or sounds like they might be in charge of something. Promises of call backs have gone, of course, unreturned.'"

Mortimer.CA writes with a recently released report from Berkeley entitled "The Landscape of Parallel Computing Research: A View from Berkeley: "Generally they conclude that the 'evolutionary approach to parallel hardware and software may work from 2- or 8-processor systems, but is likely to face diminishing returns as 16 and 32 processor systems are realized, just as returns fell with greater instruction-level parallelism.' This assumes things stay 'evolutionary' and that programming stays more or less how it has done in previous years (though languages like Erlang can probably help to change this)." Read on for Mortimer.CA's summary from the paper of some "conventional wisdoms" and their replacements.