Redjard
@Redjard@reddthat.com
Keyoxide: aspe:keyoxide.org:KI5WYVI3WGWSIGMOKOOOGF4JAE (think PGP key)
- Comment on Spicy Air ☢️ 5 days ago:
I’ll try to find some more sources later, for now I only have appeal to authority, sorry. I took a lecture on modern grid design for renewables and had a lot of coverage specifically on the state of renewable profuction and storage and the pricing.
At a cursory look the numbers online are hard to parse because articles usually are not clear on the specifics they base their costsbon, like what sort of stability the renewables can achieve at a stated cost. From what I have seen a lotnof numbers do have to be about still varying supply over the day and accross seasons.
There is another argument (that used to be used before this recent price crossover), which maybe makes it easier to accept without up to date numbers: Because of the long build-time, you can buy the batteries 10 years from now, comparing to a nuclear plant that starts construction today. Surely you can see that the battery improvements over the next decades, specifically for grid batteries, will be huge. Currently batteries are still often very similar to car batteries, there are entirely new chemistries that will be in production 10 years down the line.
It’s not like I am saying we should scrap ongoing constructions.
- Comment on Spicy Air ☢️ 5 days ago:
That is priced in yeah. Until recently that would have made it more expensive, but we now have the tipping point where overbuilt solar and batteries beat nuclear in price so finally there are no more caveats. Solar is cheaper, even at high latitudes like in northern europe, even for baseload application with big battery buffers right next to the solar farm.
I see a ton of them being spammed out like that now, solar fields with batteries in a small house in the middle, or in boxes along one side of the field.Solar itself is so cheap, that overbuilding or latitude hardly factor in, it’s mostly about the batteries.
The solar costs are also mainly the land and the construction of the frames. - Comment on Spicy Air ☢️ 6 days ago:
Gigá Whatts, inventor of the plant. To this day we honour his invention by using GW to refer to a plant the size of his first plant. It’s roughly equivalent to an oak with stem circumference of 20m.
- Comment on Spicy Air ☢️ 6 days ago:
There is a set amount of budget for replacing power infrastructure, and a set amount of capacity to be filled.
Any time a nuclear plant is starting to be built now, they could have instead already finished a renewable plant.
There is no longer any exclusive niche nuclear plants can fill, renewables and batteries beat it on all metrics now, even where stable baseload is needed.
If you need a GW of plants, you won’t build both a nuclear and a renewable GW plant, you pick one. If that GW replaces a coal plant, then nuclear will see the coal being burned for 10 more years while under construction.
The grid produces as needed, prices don’t vary enough anyone will use less power because low-emission sources are not yet available. Any nuclear power capacity under construction that could have been renewables will cause their equivalent capacity in fossile sources to be used an additional 10 years compared to if renewables had been built. - Comment on Spicy Air ☢️ 6 days ago:
Renewables are cheaper and also faster to build. Advocating for nuclear now is a delay tactic benefitting fossile fuels.
Renewables don’t create a permanent waste problem.(Also CO₂ is not as long-term as nuclear waste. It’s not easy or doable near-term, but you can let nature pull it out of the air and store the results. This can be done with none of the risks of failed nuclear storage.)
- Comment on Microsoft Edge loads all your saved passwords into memory in cleartext — even when you’re not using them; Microsoft will not fix, says the behavior is "by design" 1 week ago:
Ah, you see this does not apply here because there is no tradeoff.
You can get the behaviour of other browsers without changing the user experience at all. - Comment on Microsoft encourages chunk of experienced US staff to leave 2 weeks ago:
Headline sounds like they want tgem to relocate to Europe. Bummer.
- Comment on water sex is only appealing in theory cause in practice it’s dry af (oh the irony) 3 weeks ago:
Might be a uniquely american meme for the
mutilatedcircumcized? - Comment on Your RAM Has a 60 Year Old Design Flaw. I Bypassed It. 4 weeks ago:
Females
jucky.
Also probably a function of the intended audience. Only happens when content farming stuff that hits a certain audience, and then it’s equally done by all creators. If you’re not an attractive woman you just put someone else in the thumbnail, like someone you interviewed, or if it’s game-related a character.
- Comment on Your RAM Has a 60 Year Old Design Flaw. I Bypassed It. 4 weeks ago:
Don’t do it often enough to remember which is better and which is first. The first search result isn’t garbage enough to bother with something else.
- Comment on Your RAM Has a 60 Year Old Design Flaw. I Bypassed It. 4 weeks ago:
In those cases it’s less painfull to use a website to extract the transcript and read that.
You can skim around text way easier than a video.
TLDR: ddr ram refreshes itself, making cpus freeze sometimes when reading ram. High speed traders don’t want that so they figure out ways to make data live with two copies on two different portions of ram that freeze at different times. This is impractical for normal programs. Most of the effort is spent on working around multiple abstraction layers, where the os and then the ram itself changes where specifically data goes.
Every 3.9 microsconds, your RAM goes blind. Your RAM physically has to shut down to recharge.
This lockout is defined by the Jedex spec as TRFC or refresh cycle time. Now, a regular read on DDR5 might take you like 80 nanoseconds. But if you happen to accidentally get caught by this lockout, that’s going to bump you up to about 400 nanoseconds.Think for a second. What industry might really care about wasting a couple hundred nanconds where one incorrectly timed stall would cost you millions of dollars? That’s right, the world of highfrequency trading.
[custom benchmark program on ddr4 ram and 2.65GHz cpu:] When you plot the gaps between the slow reads, they’re all the same, 7.82 microsconds [20,720 cycles] apart every single time. […] So, the question is, if this is so periodic, can we potentially predict when the refresh cycle is going to happen and then try to read around it?
See, it’s not like the whole stick of RAM gets locked when the refresh cycle happens. It’s a lot more granular than that. With DDR4, for example, the refresh happens at the rank level. And then DDR5 gets even more complicated where you can like subsection down even further than that.
The memory controller does what’s called opportunistic refresh scheduling, which basically means that it can postpone up to eight refreshes and then catch up later if we happen to be in a busy period. […] how the heck are you going to predict opportunistic refresh scheduling?
Then stuff about virtual memory management in modern OSs
And I take two copies of my data and I space them nicely 128 bytes apart. And I’m feeling pretty good about myself, but for all I know, it could be straddling a page boundary and then the OS could have decided to put them wherever it felt like putting them.
physical ram address issues:
So the exor [XOR?] hashing phase kind of acts like a load balancer baked like directly into the silicon itself. Takes in your physical address, does a little bit of scrambling, and tries to spread it out evenly across all of the banks and channels.
This also helps with rowhammer attacks where writing close to a physical address lets you write to that other address.
So, DRAM [XOR] hashing strategies were already not documented publicly. But then after the entire rowhammer thing, obviously, there was even less incentive to publish these load balancing math strategies publicly.
If AMD and Intel documented this kind of stuff, they’d kind of be like locking themselves into a strategy because customers would start to build against it. And then next year when it comes around, it’s really going to make your life difficult because you’re not going to be able to change things nearly as easily. But if you just don’t document it, well, who’s going to complain? only weirdos doing crazy stuff like me.
Inside of your CPU, right next to the memory controllers, there’s actually tiny little hardware counters, one for every channel. […] If we do a simple pseudo [sudo] modprobe AMD uncore, it reveals those hardware counters to the standard Linux Perf tool. […] If I write a tight loop of code that constantly flushes the cache and hammers one particular memory address, then that means one counter should start to light up. And theoretically, this should tell us exactly what channel that our data is living on.
Can’t really tell what’s going on here. Well, that, my friend, is OS noise. […] The problem is these counters are pretty dumb. So you can’t tell it only count the reads from this particular process. […] All we need to do is run it 50,000 times. […] See that spike? Super cool. And now I really know where my data lives.
So, to me, I don’t really care which channel I’m ending up on, whether that’s channel 3, channel 7, whatever, doesn’t matter to me. All I need to do is make sure I’m ending up on different channels. […] The mathematical answer is that XOR is linear over GF2 which is actually really simple. Basically that means that no matter what scrambling the memory controller does, flipping a base bit will always flip the output no matter how many things are chained together.
Goes on to write low latency benchmarks which show lower latency.
- Comment on The 49MB Web Page 5 weeks ago:
ubo has a button to disable javascript. For news pages that tends to be the easiest way to make them barely usable.
- Comment on Turbines are our friends 5 weeks ago:
Lots of huts probably have an ac or heater. This could all be the same device, at which point it’d definitely be easier than running the pipes for water and maintaining pumps and a dedicated tank.
Don’t see a reason you couldn’t have a simple ac window unit that also has a warm water port, which you plug a single cable into going straight to your pannels on the roof. - Comment on Turbines are our friends 5 weeks ago:
Modern solar into a modern heat pump is gonna be more efficient than heating water. It’s also more versatile and convenient, cause it maintains that efficiency when you pull power from the grid at night. And of course lets you use the power for other purposes.
- Comment on optimal amount of syrup 1 month ago:
can make it round so the syrup spreads more evenly from the center.
Oops you made pancakes
- Comment on 1 month ago:
Are you unbiased in this matter despite your connections to big cheddar? I prefer moon gouda.
- Comment on 1 month ago:
You’re counting technically at war? Then almost no country will qualify. Certainly not the us, which multiple countries gotta have declared war with.
- Comment on [deleted] 1 month ago:
we’re still enjoying each other’s friendship and love.
look at ven diagram
it’s complicated
- Comment on 1 month ago:
I’d like to buy your set for 19.1k please, would you kindly deliver it to north korea?
- Comment on My glasses 1 month ago:
I assumed he’d estimated it based on how distorted the face appears behind the glasses. I do that all the time.
At this angle it’s hard for me to do that, since I usually use the edges of the face to estimate it. negative glasses pull the line inwards, positive outwards. I can reliably tell when someone is wearing fake glasses (0 strength) for example, and probably estimate strength within 30% of the actual value.
If the image was higher res maybe I could estimate this case too. Or this professional optometrist is just a lot better at it than I am.
Strong negative glasses: (Note the faces contours in the glasses appearing well inside the faces contours around the glassed)
Fake glasses:
Positive glasses:
PS: Searching for generic terms yields 100% fake glasses, so I took a specific person I remember having strong glasses for myopia.
- Comment on there is a special place in hell for these scientists 2 months ago:
So no seems this is a different group, doing this more professionally and marketing themselves as an ai cloud startup.
- Comment on Honk 2 months ago:
Only one besides Ox I can think of is K9.
- Comment on Honk 2 months ago:
With the repeated letter rule, tit or ass would also work.
- Comment on Anon is going to be rich 2 months ago:
I see. That does seem far fetched though, and really only holds any plausability once your ID doesn’t match your own claim.
- Comment on Anon is going to be rich 2 months ago:
Yeah but then if they pass your id and agree to the bribery they’ll give you the 100$? It’s the wrong way around to be bribary.
Bribary needs pass and pay, this is pass or pay. The incentive for the storekeeper is to not sell to you and get the money.
- Comment on Anon is going to be rich 2 months ago:
How is it related to bribery?
- Comment on art 2 months ago:
How would you get it past the buttplug?
