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Can confirm, installed central air AC (and improved insulation) at my place this year in Potrero Hill. Costly given labor and permit BS in SF. It’s consistently hotter than 20 years ago to. I had 80F+ in my house during 1/3rd of the year at 4pm over the last 3 years. Barely get any fog these days in my hood.


Google Maps in satellite mode? IMO Google Maps looks better and of course includes way more meta data.

I assume this project is more about showing off the underlying open source project.


Maybe don’t sell a TP-Link branded router unless you are a licensed reseller? You are part of the problem everyone is complaining about.


How am I part of any problem?

Are you familiar with the first sale doctrine? My actions were perfectly legal at all times.

I did this professionally, had bought hundreds of tp-link routers from legitimate suppliers. It's not like I found them on the street or anything like the sellers described in OP. I had over 50k invested in a specific router model at one point.


Why shouldn't you be allowed to sell things you legally own? First-sale doctrine is generally a good thing.


"Not everything exists for RISC-V that exists for the other ones, but that is filling in at incredible pace."

The RISC-V project is now 7 years old. Remember that the 6502 and its supporting hardware went from proposal to final silicon in 2 years. And that was done using a hand drawn layout.


UC Berkeley has had functional RISC-V silicon for years now as research devices. RISC-V hasn't really been a thing outside of their architecture research group for more than a few years now. The UCB-BAR also has some fairly decent RISC-V cores (BOOM and Rocket) available as open source RTL.


The 6502 was also far more primitive; doesn't seem like a useful comparison point.


That may be but RISC is supposed to be simple (or if you prefer, reduced) and back then the 6502 had no infrastructure to speak of. 7 years is unquestionably a long time and then if you go to the RISC-V spec and look at lucky chapter 13, "B" Standard Extension for Bit Manipulation it says:

  This chapter is a placeholder for a future standard extension to provide bit manipulation instructions, including instructions to insert, extract, and test bit fields, and for rotations, funnel shifts, and bit and byte permutations.
It is cheaper than ARMv8 but that's about it.


~3500 transistors vs millions (tens of millions? hundreds?)


But the tooling is much better today. I read that the layout of the 6502 was mostly made by one person.

https://research.swtch.com/6502


They also weren't working in contraints of 1000+ design rules today's nodes would need for custom design.


What's the incentive? Credits? Give me a break.

It's fairly easy to beat the given examples but in the end heap management is heavily dependent on application, client code, platform, hardware and many other criteria. It's a very complex problem space and what matters here is how existing important code behaves and continues to behave given that existing code has most likely made assumptions how the heap is managed.

glibc is a good example of a perfectly fine compromise not optimized for any particular use case. Anyone who has had performance issues with it has most likely already implemented their own solution for their problem set.

It might much more worthwhile to develop a set of malloc like implementations a developer can chose from instead of going for a fits all approach.


Further, the complexity and need for flexibility is exactly the problems that I'm trying to deal with here. That's why the challenge encourages splitting the allocator up in Unix-like pieces and stacking them to get the desired features.


Pushing the state of the art in application level memory management? Too lofty? Come on, it's fun :)


The nominal voltage of a LiFePO battery is 3.2V (or 3.6V for other types).

MnO2 -> 1.44V * 0.285mAh/g = 0.41Wh/g

LiFePO -> 3.2V * 0.170mAh/g (from what I could find online) = 0.533Wh/g


I could be wrong, but I think production lipos (and variants) are closer to .15Wh/g, and not much higher than 0.25 for anything that isn't entirely theoretical.


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