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Quiet Cooling With a Copper Foam Heatsink

Carnildo Re:Reynolds number (148 comments)

OTOH, the traditional CPU/mobo setting is a little problematic; first you put the most heat-concentrating element in the middle of everything, and then later you realize it needs cooling.

The theory is that the exhaust air from the CPU heatsink spreads out to parts that are more heat-tolerant but still need active cooling, such as the voltage regulators. A VRM that can operate at 100C without trouble can be cooled just fine with a slow flow of 50C exhaust air from the CPU cooling system.

In practice, people have found that a front-to-back airflow, preferably ducted, is quieter and more effective than a mix of back-to-front, blow-down, and turbulent airflows. It does, however, require actual engineering work, rather than just attaching a bunch of fans to everything.

13 hours ago

Quiet Cooling With a Copper Foam Heatsink

Carnildo Re:Kickstarter warning (148 comments)

*Exterior* temperature? My current heatsink can manage a CPU temperature below that, with the fan at idle. Why would I want to downgrade to this thing?

13 hours ago

seL4 Verified Microkernel Now Open Source

Carnildo Don't tell HURD (76 comments)

Don't tell the HURD people -- they'll change which microkernel they're building around, again.

2 days ago

Oracle Offers Custom Intel Chips and Unanticipated Costs

Carnildo Re:Sales flow chart. (96 comments)

How big is big enough that nothing but Oracle will do? Facebook is on MySQL, Wikipedia is on MariaDB and Google is using Bigtable.

It's more the nature and size of access rather than the sheer volume of data. Facebook and Wikipedia both act on small portions of the overall dataset, Wikipedia additionally is a read-mostly workload, and Google's access patterns aren't suitable for a relational database.

2 days ago

Western US States Using Up Ground Water At an Alarming Rate

Carnildo Re:PBS covered this (374 comments)

I don't know about Los Angeles or San Francisco, but Phoenix's water usage has been dropping as a result of replacing citrus orchards with subdivisions.

5 days ago
top Announces Linux Support

Carnildo Re:GOG discovers DOSBOX works on Linux (81 comments)

There was a brief period (roughly 1993 to 1995) when copy protection worked to stop small-scale piracy: around the time when CD-ROM drives first became popular. If you could stuff a CD full of game files, you had a game that could not be economically pirated, because copying the CD required either a dedicated hard drive to store the data (hundreds to thousands of dollars), a hugely expensive CD recorder (tens of thousands of dollars), or a CD stamping facility (millions of dollars).

about a week ago

Google Offers a Million Bucks For a Better Inverter

Carnildo Re:I don't understand the problem here. (260 comments)

The kit includes eight 8 x 8 x 5 inch Enphase inverters weighing 6 lbs each

Which gives a power density of 0.78 watts per cubic inch. The Google challenge calls for a minimum power density of 50 watts per cubic inch.

about a week ago

New Map Fingers Future Hot Spots For U.S. Earthquakes

Carnildo Re:Self-justification (49 comments)

Starting on page 12 of the report is a series of maps showing the changes since the 2008 report. Of note:

* The South Carolina seismic zone has been displaced southward by about 50 miles.
* The New Madrid zone has changed shape, with some areas seeing a substantial reduction in estimated earthquake risk.
* The risk zones in California are more sharply defined.
* The risk for the central Rocky Mountains area is higher, but still relatively low.
* The earthquake risk estimate for coastal Oregon has been reduced.
* A new seismic zone is present in Oklahoma, reflecting whatever is causing the massive increase in earthquake rates there.

about two weeks ago

The Improbable Story of the 184 MPH Jet Train

Carnildo Re:A Century Ago (195 comments)

The majority of passenger trips in the US are either less than 50 miles, or more than a thousand, with almost nothing in between. At the short end, the flexibility of car travel beats the cost reduction of rail; at the long end, the speed of air travel beats rail.

The only exception to this is the BosWash area, where -- guess what? -- Amtrak is able to provide profitable rail service. It's not motivation that keeps the US from having good passenger rail service, it's geography.

about two weeks ago

LibreSSL PRNG Vulnerability Patched

Carnildo Re:LibreSSL cannot be different by being the same (151 comments)

The random number generator should not be seeded only by a PID.

The PID is used as an absolute last-ditch fallback in the case that no other sources of randomness are available. In order for this to happen, /dev/urandom needs to be inaccessible, the KERN_RANDOM sysctl needs to be unavailable, gettimeofday() needs to fail, and clock_gettime() needs to fail.

If you're running on a system that crippled, you've really only got two choices: try seeding using the PID, or use an unseeded RNG. Or follow Theo's advice and get yourself a real operating system.

about two weeks ago

Mapping a Monster Volcano

Carnildo Re:And this doesn't seem like a bad idea? (105 comments)

Soviets made a safety experiment with a nuclear reactor in Chernobyl. It didn't go wrong at all.

Correct. The 1982, 1984, and 1985 tests of using rotational energy of the turbines to power the emergency pumping system all went just fine. The 1986 disaster happened when the operator ignored the test procedure (specifically, the instruction "Reduce reactor thermal output to between 700MW and 800MW. If reactor thermal power output drops below 700MW, abort test and shut down reactor" -- the operator reduced the power to 30MW, raised it to 200MW, and attempted to perform the test).

about three weeks ago

Is Time Moving Forward Or Backward? Computers Learn To Spot the Difference

Carnildo Re:ok (78 comments)

More significantly, if you see left-to-right motion and say "forward", what percentage do you get right? I suspect there's a bias in videos towards left-to-right motion of subjects (or conversely, right-to-left motion of backgrounds), and I don't see anything in the paper about controlling for it.

about a month ago

The Revolutionary American Weapons of War That Never Happened

Carnildo Re:Dishonourable Mentions (133 comments)

Would it have changed the course of warfare? A bouncing bomb that worked at sea would have rendered virtually all navies obsolete.

You know what else can lift a ship and break its back? A torpedo with a magnetic fuse. Oddly enough, torpedo bombers don't appear to have rendered the world's navies obsolete.

about a month ago

IRS Lost Emails of 6 More Employees Under Investigation

Carnildo NSA: For All Your Backup Needs (465 comments)

I'm sure the NSA has copies. Perhaps someone should request them?

about a month and a half ago

New Evidence For Oceans of Water Deep In the Earth

Carnildo Re:Old bible scolars (190 comments)

Another candidate is the filling of the Persian Gulf: it wouldn't have been as abrupt as the proposed Black Sea deluge (taking years rather than days), but during the last Ice Age, the Gulf would have been prime agricultural land, at least as good if not better than Mesopotamia. There's a decent chance that there was a civilization there, where the Black Sea would likely have been nomadic tribes.

about a month and a half ago

GnuTLS Flaw Leaves Many Linux Users Open To Attacks

Carnildo Re:"malicious server" (127 comments)

Sorta important - there's not much popular software that uses GNUTLS, but wget is one of them. Since it's almost always used as a client, it's probably wise to use curl -O against unknown servers, until they get this straightened out.

wget can be built against OpenSSL, and curl can be used with GnuTLS.

about 2 months ago

Fiat Chrysler CEO: Please Don't Buy Our Electric Car

Carnildo Re:Something Doesn't Smell Right (462 comments)

How much did it cost to setup their infrastructure to produce these cars? It seems like it would be a loss if they don't sell any at all. Why wouldn't they raise the price?

The electric Fiat shares probably 90% of its parts and most of an assembly line with the gas-powered Fiat 500; it's the remaining 10% (particularly the batteries) that make the 500e so expensive to produce. California clean-air laws require Fiat to sell a certain number of electric cars if they want to do business in California and restrict how much Fiat can mark up the price of the electric version. If Fiat can't get the parts needed for less than the permissible markup, they're required to sell the cars at a loss.

about 2 months ago

Google's Rogue Internet Balloon Test Spurred UFO Reports Nationwide

Carnildo Re:What's the protocol? (65 comments)

I don't know about this balloon, but the ones I've been tracking on FlightRadar are solidly *above* controlled airspace. Airliners tend to hang out around 30,000-40,000 feet, business jets are typically 35,000-45,000 feet, and Google's balloons are at 60,000 feet and above.

about 2 months ago

Milwaukee City Council Proposal Would Pave Way For Uber, Lyft

Carnildo Re:Dear Timothy (76 comments)

That aside, both the passenger and the driver are aware of the optimal route

The passenger is aware of what his smartphone thinks is the optimal route.

Consider going from the Spokane airport to the Lakeside area: Google Maps routes you via I-90 and the Maple Street Bridge, but during rush hour, this is a wonderful place to run up the meter, with delays of 10-30 minutes on a 30-minute trip. Going via the Sunset Highway instead avoids much of the traffic (and cuts a quarter-mile off the meter), but to someone who's not a local, it looks like you're being dragged off into the middle of nowhere to be mugged, or at least ripped off on the taxi fare.

Now, as someone from out of town, how are you going to judge if the driver is telling you the truth about why he's going somewhere your smartphone doesn't want him to?

about 3 months ago

Milwaukee City Council Proposal Would Pave Way For Uber, Lyft

Carnildo Re:Dear Timothy (76 comments)

what is it you think is the problem? what do you think will surface? please no snark, I'm genuinely curious.

1) Drivers deliberately taking sub-optimal routes to run up the meter.
2) Drivers putting in too many hours a day, leading to an increased accident rate.
3) Drivers using the cheapest cars they can buy/skimping on maintenance to keep their costs down.
4) Drivers extorting passengers to pad their income ("An extra $20 off the books, and I won't take the scenic route").
5) Drivers refusing to take people to low-profit destinations ("Take you out there? The hour I'd spend getting back to the city for my next fare would eat my profits for the week")

about 3 months ago



Carnildo Carnildo writes  |  more than 7 years ago

Carnildo (712617) writes "Back in the day, people were up in arms when Geocities changed their copyright terms so that you were granting them a "perpetual, irrevocable" license to do whatever they pleased with your content. That's nothing compared to the new Fark terms of service. By submitting content to Fark, you are assigning the copyright of your submission to Fark, and in return, they are granting you a non-exclusive, non-transferrable, and royalty-free license to use your creation."



Feeling blue

Carnildo Carnildo writes  |  more than 7 years ago

Lest ye worry that, with the coming of Vista, the Blue Screen of Death hath been vanquished for all time, fear not, for verily I have seen one, not these five minutes past.


Carnildo Carnildo writes  |  more than 7 years ago

Windows Vista doesn't suck.

Really. Saying it sucks would be too kind. It's a steaming pile of you-know-what.

I got to install and use Vista RC2 today to test how my company's software works under the new OS.

The install process went as expected: the installer asked a bunch of questions, had me accept a license with a bunch of terms I'd never agree with if I was installing this on my home computer, then announce that since I wasn't running XP SP2, it was going to wipe out my existing XP install. No problem there: I've got XP install disks, so I can put things back when I'm done.

What it doesn't mention is that, in addition to wiping out c:\windows, it will also wipe out c:\program files and c:\documents and settings. Fortunately, there's nothing I can't live without on this computer.

So, an hour and three reboots later, Windows is starting the setup wizard. It asks a few questions like my username and password, and what sort of network I'm connecting to. Windows proper then starts up, and it brings up the "welcome center" -- and asks again what sort of network I'm connecting to, this time bringing up the "User Account Control" dialog.

The first thing I do with any new OS is to adjust the preferences.

Those control panels are a mess. Each control panel tab under XP is a control panel now, with one or more long "descriptive" names. They're categorized into ten groups, and any given tab may be in more than one category. It would take me two or three tries to find what I'm looking for, and I still haven't found how to change the mouse acceleration, or get rid of that "your CRT is going bad" drop-shadown around the pointer.

Oh, and that dreaded "Windows registration" stuff? Where Microsoft will degrade your Vista experience until you prove that you've paid the Microsoft tax? It's only by accident that I discovered that Windows hadn't been registered during the install process, and things would have started breaking in three days.

At this point, I'm ready to install and test our software. I click on "Network" to access the fileserver and download the latest installer. It takes Vista a while to locate the fileserver on the network, but at least there's a progress bar that indicates it's doing something. I double-clicked on the fileserver icon, and get prompted for my name and password. I enter them, click "ok", and get told that login failed, check my username and password. The password's fine, but now the username box shows "Junkbox2000\JoeBloggs": Vista has prepended my computer name to my username. As far as I can tell, there's no way to stop Vista from doing this, so I'm locked out of the network.

Further checking of the computer reveals that the old "Documents and Settings" folder is still there, just hidden. Since I can't remember where I stuck the installers, I bring up the search dialog. It takes me three tries to do a full-disk search filename search. The default search is to only search indexed locations, ie. your home directory, with a full-document-text search for the terms you entered. Selecting "search everywhere" from the "location" dropdown doesn't *really* mean everywhere, just those areas that have been indexed. You need to additionally check the "include non-indexed, hidden, and system files" box.

Searching for files by name not only gives you files with the specified name (setup.exe), but also close matches: setup6.0.2.exe, setup6f3.exe, and

So I've found an old installer copy, and I'm finally ready to install. I double-click on it, and immediately get hit by a scary-looking User Account Control dialog: "An unidentified program wants to access your computer". If this is the typical user experience upon installing software on Vista, people will get used to clicking "allow" in that dialog even faster than they got used to clicking "yes, install that spyware" in IE.

At this point, I'm running the latest version of our software, but I need to test the self-update functionality. The easiest way to do this is to open the "current version" file in Notepad and change the version name to that of an older version. I go to save the file, and get the following error message: "Cannot create the C:\Program Files\MySoftware\version.dat" file. Make sure that the file name and path are correct." No hint that the real problem is that I don't have write-access to the file.

I run the updater, expecting it to fail in spectacular fashion. After all, if I don't have permission to write to the application directory, why should a program I'm running? Much to my surprise, it works flawlessly. I suppose this is a hole in Vista's security model, but *I'm* not going to tell Redmond about it.

I try the PDF export functionality of our program, saving the PDF in the same folder as the original file. The "open file" dialog shows everything, while Windows Explorer and the command prompt only shows the original file. Rebooting does not fix this.

Tomorrow I get to test installing from CD. This promises to provide even more fun. After that, I'll try installing and running as a non-admin user.


Moderation in all things

Carnildo Carnildo writes  |  more than 9 years ago

It seems that Slashdot has decided I make a good moderator. I'm getting mod points every few days now.

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