luminiferous (u/luminiferous)

luminiferous commented on We Need New Motherboards Before GPUs Collapse Under Their Own Gravity erikmcclure.com/blog/we-n... · Posted by u/blackhole

jrockway · 3 years ago

I have one of these for a much smaller card, mostly so that cold airflow from the floor intake fans actually has a path to get up to the RAM and VRMs. This is a workaround for a case that doesn't have front intake, which is preferable in my opinion.

It does look a little cool, but I always worry a little about the reliability of the cable itself. Does it REALLY meet the signal integrity specifications for PCI-E? Probably not. But, no unexplained crashes or glitches so far and this build is over 2 years old.

luminiferous · 3 years ago

LTT has a video where they tried to see how many PCIe riser cables they could string together before it stopped working.[1] They got to several meters. Maybe you could argue that it's worse inside a PC case since there's more EMI, but it seems like your PCIe riser cable would have to be very out of spec before you'd notice anything.

[1] https://www.youtube.com/watch?v=q5xvwPa3r7M

luminiferous commented on OctoPrint octoprint.org/... · Posted by u/laktak

jcims · 5 years ago

I tried it with the Ender 3 V2 and there is some kind of bandwidth issue that kept it from printing successfully. Exact same gcode worked great from sdcard, failed miserably via octoprint. I’m guessing it has to do with the available ports?

luminiferous · 5 years ago

It might have to do with the USB buffer on the Ender. If the buffer is too small (e.g. 4 gcode commands or so) then when the buffer is filled with commands that execute very quickly, its possible for the printer to empty the buffer before new commands come down the pipeline from Octoprint. This causes the printer to stop the printhead sharply, which can cause quality issues on prints, or maybe even print failure if the sudden stop causes the print to detach from the bed.

[You can fix this if you're using Marlin](https://www.reddit.com/r/ender3/comments/btjk22/octoprint_is...), since Marlin allows you to configure the buffer size. Generally more buffer is better, but do be aware that increasing the buffer size will cause the printer to be less responsive to the "stop print" command on octoprint (since the printer will continue executing the commands that have been buffered).

luminiferous commented on Show HN: Kong – Physical Cryptocurrency kong.cash/... · Posted by u/ccamrobertson

ccamrobertson · 6 years ago

There is no ICO.

We're selling packs of Kong in a limited fashion to cover the costs of manufacturing the hardware. We have a limited number of units available so we're slowly opening up sales to our mailing list.

Take a look at sections 4.2 and 4.3 of the paper for information on our lockdrop; this is the only other way to get Kong token. Lockdrops are a novel means of distributing token based on opportunity cost rather than selling the token.

luminiferous · 6 years ago

Just to clarify, that means that I would need to 1.) purchase some packs of Kong, which are unloaded, and then 2.) participate in a lockdrop to gain the tokens with which to load the Kong? Seems fine and dandy wrt the acquisition of bills, but how will adoption by vendors happen?

luminiferous commented on Show HN: Kong – Physical Cryptocurrency kong.cash/... · Posted by u/ccamrobertson

luminiferous · 6 years ago

Question: since bills can be either loaded or unloaded (either because they haven't been put in circulation yet, or because they're counterfeit), doesn't that mean that e.g. a vendor taking my Kong who has no trust in me would have to individually check each bill via NFC or i2c to make sure that the contract backing the bill is valid (and the correct amount, etc.)? And that I would have to do the same for all the bills I get back as change? As a completely trustless transaction, this seems like it could be entirely too slow for most applications, without some kind of device to quickly verify multiple bills.

luminiferous commented on “May You Live in Interesting Times” quoteinvestigator.com/201... · Posted by u/Anon84

rectangletangle · 6 years ago

Not exactly the same thing. It's like mayo but thinner and sweeter, and has little green fleks in it.

luminiferous · 6 years ago

Is it riffing off ranch dressing? I've heard that ranch is associated with the US, outside of the US.

Edit: looks like "american sauce" can refer to a multitude of things. Typically it seems to either be some kind of ranch or thousand island.[1] Both of which are separate from "Sauce Americaine", from French cuisine.[2]

2nd edit: If the OP is talking specifically about Heinz brand "American Sauce", apparently the closest match in American cuisine is either thousand island or big mac sauce/"secret sauce" used on burgers (which is based on thousand island). It is pretty American, come to think of it.

[1] https://www.thedailymeal.com/news/travel/which-mayonnaise-he...

[2] https://en.wikipedia.org/wiki/Sauce_Am%C3%A9ricaine

luminiferous commented on How to pack a Norwegian sandwich, the world’s most boring lunch vox.com/the-highlight/201... · Posted by u/babelfish

magicalhippo · 6 years ago

Our bread contains a lot of whole grain flour. Don't underestimate how that effects how full you feel.

When losing weight I found I could easily get away with skipping lunch entirely, just two or three slices of bread as a late breakfast. But only if the bread had sufficiently high amount of whole grain flour (>90%). The days I only got hold of 50-60% whole grain bread I had to top up with a small lunch.

luminiferous · 6 years ago

It's probably the fiber content, if I had to guess. Fiber is really good at making you feel full, which is why psyllium husk is sold as a dietary supplement.

luminiferous commented on Toyota is trying to put solar panels on a Prius to charge battery during the day bloomberg.com/news/articl... · Posted by u/hhs

wtallis · 6 years ago

> But dragging the panels around with you so that you always have some kind of charging seem pretty reasonable.

It might prevent the worst case scenario of being stranded in a desert without fuel. But for everyday driving, dragging around that extra weight has a real cost, which could quite plausibly outweigh the benefits to everyday driving.

Remember, our auto industry has moved to the point where spare tires are starting to become uncommon and full-size spares are almost unheard of. The market isn't trying to optimize for the worst case scenario.

luminiferous · 6 years ago

When I first read your comment, I thought that there was no way that solar panels could be heavy enough to affect your mileage. So I did some quick calculations.

Estimates of solar panel weight I found say that solar panels tend to weigh 2-4 lb per sqft.[1] Note that estimate is for roof-mounted solar panels, but if anything, car-based solar panels should be lighter.

A Prius has dimensions of 180"x69".[2] The sqft of the solar panels will be less than that, since the panels don't cover the windshield, and they don't go all the way to the edge of the hood, etc. That's 86.25 sqft, so that puts an upper bound on the weight of the solar panels at 345 lb. If we assume the lighter end of the scale for solar panel weight, that becomes 172.5 lb. That's 6-11% of the curb weight of a Prius. That's pretty substantial! For reference, a 50 lb spare tire kit can reduce fuel economy (and presumably mileage, for EVs) by 1%.[3]

Although that does imply that you're breaking even if the solar panels can increase your range by ~5%, not accounting for the weight. If you live somewhere like Arizona, that might work out. If you live in Seattle, maybe not.

[1] https://sunmetrix.com/is-my-roof-suitable-for-solar-panels-a....

[2] https://www.toyota.com/prius/features/dimensions/

[3] https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=...

luminiferous commented on How to do a code review google.github.io/eng-prac... · Posted by u/iamaelephant

dymk · 6 years ago

But then Thursday just becomes Friday...

luminiferous · 6 years ago

That's fine, because when something breaks the day after you've pushed, it's Friday and everyone's in the office. People are still going to rush the deadline, but putting the deadline earlier means you have time to deal with stuff that breaks after the deadline.

luminiferous commented on Who Owns Huawei? papers.ssrn.com/sol3/pape... · Posted by u/smacktoward

rolltiide · 6 years ago

> but the myth of Huawei’s employee ownership seems to persist outside of China.

Never heard of it, never thought about it, not sure why proving/disproving this is in the author's interest.

The main curiosity regarding what the structure of Huawei actually is would be interesting, edge of my seat for that one. But who cares about the employees, who would ever believe that it would be anything other than corporate speak? I would basically assume that because a shareholder who happens to be employed there at some point in time, that the company would make that assertion just to make people feel good. The profit sharing scheme the abstract suggests is good enough to align incentives and make the non-capital class feel like they "own" something. It is so improbable that a labor class is also a capital class that I would be more surprised to see a paper showing how it was true, and it would be from Harvard Business School and not randomly uploaded to SSRN.

luminiferous · 6 years ago

> Never heard of it, never thought about it, not sure why proving/disproving this is in the author's interest.

It is in Huawei's interest to not be labelled as a state-owned or state-controlled actor. The perception of being controlled by the Chinese state is precisely why many western countries are leaning away from purchasing Huawei networking equipment for their up and coming 5G networks, and also (at least in the case of the US) advising against, and then banning, consumer electronics made by Huawei. Huawei has been trying to convince the public that it is in fact employee owned and therefore not controlled by the Chinese state by touting its "employee virtual ownership program", and the purpose of this paper appears to be to dispel that notion.

luminiferous commented on A Boeing Code Leak Exposes Security Flaws Deep in a 787's Guts wired.com/story/boeing-78... · Posted by u/samuell

jjtheblunt · 6 years ago

Take over as in turn off, not steer, right?

luminiferous · 6 years ago

From the original 2015 article about the hack:

"Miller and Valasek’s full arsenal includes functions that at lower speeds fully kill the engine, abruptly engage the brakes, or disable them altogether. The most disturbing maneuver came when they cut the Jeep's brakes, leaving me frantically pumping the pedal as the 2-ton SUV slid uncontrollably into a ditch. The researchers say they're working on perfecting their steering control—for now they can only hijack the wheel when the Jeep is in reverse. Their hack enables surveillance too: They can track a targeted Jeep's GPS coordinates, measure its speed, and even drop pins on a map to trace its route."[1]

The wheel control only working in reverse kind of makes sense. They're probably using some kind of self-park feature to control the wheel, and some engineer (sensibly) put in some kind of interlock to prevent the wheel from moving on its own when travelling at speed.

The wording of the article implies that these particular attacks only work when the car is travelling at low speed, but earlier in the article they did mention that they could (and did!) throw the transmission into neutral while the Jeep was driving on the highway. The driver was unable to recover without turning the car off and back on again.

In a followup a year later, they showed that they were able to do these attacks at any speed, including turning the steering wheel.[2]

[1] https://www.wired.com/2015/07/hackers-remotely-kill-jeep-hig...

[2] https://www.wired.com/2016/08/jeep-hackers-return-high-speed...