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grumbelbart

108 karma · joined February 25, 2017

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grumbelbart··on Largest Mass Resignation in US History as 100k Federal Workers Quit
> the federal workforce excluding the postal service (which has actually shrunk, as a semi-private employer) has grown by about 1% per year since 2000

That's less than it seems though, given that the US population has grown with over 0.7% per year for most of those years.

https://www.macrotrends.net/global-metrics/countries/usa/uni...

grumbelbart··on New records on Wendelstein 7-X
Mandatory: We should build it in space and beam the electricity back to earth using electromagnetic waves. We could collect those using solar cells. And then get rid of the plant and use the sun instead.
grumbelbart··on My first verified imperative program
Long-term this would be done using LLMs. It would also solve LLMs' code quality issues - they could simply proof that the code works right.
grumbelbart··on Show HN: LoopMix128 – Fast C PRNG (.46ns), 2^128 Period, BigCrush/PractRand Pass
That is correct. The permutations will likely break up into multiple cycles, and the cycle lengths follow a poisson distribution.

https://dms.umontreal.ca/~andrew/PDF/CycleLengths1.pdf

grumbelbart··on Reversible computing with mechanical links and pivots
There are optical accelerators on the market that - I believe - do that already, such as https://qant.com/photonic-computing/
grumbelbart··on Have we underestimated the total number of people on Earth?
That's a misconception. Earth is still pretty much in an equilibrium and emits as much as it gets from the sun. Global warming is due to the heat staying a bit longer in the system, not due to emitting less.
grumbelbart··on Can a Geothermal Startup Vaporize Rock to Drill the Deepest Holes?
Drilling is essentially an O(N^2) method. You need to replace your drill bit every X meters, and the time it takes to replace it about linear in the current depth.
grumbelbart··on Geothermal power is a climate moon shot beneath our feet
That's just economy of scale, though. It's always more expensive to be the early adaptor. In Switzerland, 15% of all buildings are heated using geothermal heat pumps.
grumbelbart··on House designed on Passive House principles survives Cali wildfire
> Would the insulation also make it sound-proof?

Not necessarily. Thermal insulation uses light materials, sound insulation requires heavy materials.

grumbelbart··on Debugging in the Multiverse
I was once working in a company producing software / operating systems for smart cards (such as the chips on your credit cards). We developed a simulator for the hardware that logged all changes to registers, memory and other states in a very large ring buffer, allowing us to undo / step backwards through code. With RAM being large, those chips being slow, and some snapshotting, we were usually able to undo back to the reset of the card. That was a game changer regarding debugging the OS.
grumbelbart··on Weekend projects: getting silly with C
So maybe we have different definitions of "time travel". But I recall that

- if a compiler finds that condition A would lead to UB, it can assume that A is never true - that fact can "backpropagate" to, for example, eliminate comparisons long before the UB.

Here is an older discussion: https://softwareengineering.stackexchange.com/q/291548

Is that / will that no longer be true for C23? Or does "time-travel" mean something else in this context?

grumbelbart··on Solar generates fifth of global electricity on summer solstice midday peak
The current trend is somewhat exponential, though, and solar is now finally cheap enough to compete even without subsidies. That will hopefully lead to an even stronger boost.

https://en.wikipedia.org/wiki/Growth_of_photovoltaics#/media...

grumbelbart··on Tesla's FSD – A Useless Technology Demo
https://electrek.co/2024/02/13/tesla-worker-died-horrible-cr...
grumbelbart··on Tesla's FSD – A Useless Technology Demo
But "works in limited cases" is absolutely not enough, given what it promises. It drove into static objects a couple of times, killing people. Recent videos still show behavior like speeding through stop signs: https://www.youtube.com/watch?v=MGOo06xzCeU&t=990s

Meaning that it's really not reliable enough to take your hands off the wheel.

Waymo shows that it is possible, with today's technology, to do much much better.

grumbelbart··on Tell HN: China Is Entering Lockdown
Huh? Plenty of previous non-covid vaccines require more than two shots.
grumbelbart··on Linus' reply on Git and SHA-1 collision
Fully agree to everything you said, one point:

> Didn't Git v2.0 break backwards compatibility?

No, it did not.

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