jabl

33 ms·

511.
by jabl 3y ago
IIRC they did add byte operations pretty soon after the initial generation. The memory consistency model was pretty crazy, though.
512.
by jabl 3y ago
In the end it was market forces that did it in. Making new chips was (still is!) exponentially more expensive for each generation, and at the same time mass market chips were getting better and better while they could amortize the NRE costs
513.
by jabl 3y ago
Alternatively, you could say that Sifive just wants to retain their investment into cores with the C extension. Or that Krste is so wedded to the idea of "RISC purity + C + fusion" as an alternative to more complex instructions th
514.
by jabl 3y ago
> This looks a lot like the thumb ARM thingy? Unsure what you asking? The RISC-V C extension has some vague similarities with thumb. But the Qualcomm proposed Zics extension absolutely hasn't. Zics adds things like more advanced add
515.
by jabl 3y ago
So will this require the C extension that Qualcomm seems to be so opposed to? See the subthread at https://news.ycombinator.com/item?id=37996820 Qualcomms latest: https://lists.riscv.org/g/tech-profiles
516.
by jabl 3y ago
Rotax 900 series also have a maximum rpm of 5800, substantially higher than old school aero engines, which also helps improving power/weight.
517.
by jabl 3y ago
Weren't many of the planes in operation today certified before 100LL became the only available grade (excluding things like 115/145 or even more exotic brews which I guess today are used only at Reno air races and such)? E.g. 80&#
518.
by jabl 3y ago
That's mostly an issue on cheap engines without hardened valve seats. Aviation engines switched to hardened valve seats well before WWII.
519.
by jabl 3y ago
Sure there are, but the 100 in 100 octane avgas refers to MON, not RON. 100 MON fuel is a bit trickier to be done without lead, although we now have G100UL which does it.
520.
by jabl 3y ago
Lead deposits happen for aviation engines too. Wouldn't surprise me if at some point after leaded fuel is gone, engine manufacturers start to increase TBO intervals.
521.
by jabl 3y ago
I suspect what needs to happen is that someone (ASTM?) comes up with a spec for unleaded 100 octane avgas, and then the FAA can give a blanket approval for that spec for any plane certified for 100LL.
522.
by jabl 3y ago
Practically all aviation engines have used hardened valve seats since even before WWII. Maybe some WWI era engines didn't have them, I'm not sure.
523.
by jabl 3y ago
As others mentioned, diesels tend to have worse performance/weight due to heavier construction. In the early days of aviation (like 1930's or such) there was some effort to introduce diesels for long-range aircraft, the idea being
524.
by jabl 3y ago
Many, or even most, of the engines are indeed old designs. But e.g. Rotax offers certified version of some of its 900 series engines, which are a relatively new design, some with fuel injection, FADEC, etc.
525.
by jabl 3y ago
> The 75+ heads, all have steel seats. No idea about 240z specifically, but at least things designed for sustained high performance (like aero engines) tend to use valve seats made from some wear and temperature resistant alloy like stel
526.
by jabl 3y ago
> I don't know what this plastic wood is tbh It's basically combining wood fibres with a plastic resin (instead of lignin as in natural wood), then manufactured with some kind of molding or extrusion process. https:/&#x2F
527.
by jabl 3y ago
And today we're trying to get rid of many nasty chemicals used as flame retardants. To the point it has become a checkbox item for the eco conscious sofa buyer.
528.
by jabl 3y ago
AFAIU qualcomms proposal for extra 32-bit instructions is https://lists.riscv.org/g/tech-profiles/attachment/332/0/cod... It adds new addressing modes, and things like load/store-pair instructi
529.
by jabl 3y ago
Well, the fabless part is at least easy to understand. Building a new high end fab costs billions and requires deep expertise that takes years, if not decades, to build. Practically every chip company these days is fabless. Intel is the exc
530.
by jabl 3y ago
I'm sure all the big players in this space have tried RoCE, and found it wanting. Hence all these new approaches.
531.
by jabl 3y ago
There seems to be quite a lot of overlap between Falcon and what the Ultra Ethernet Consortium is ostensibly working on. As well as Amazon's Scalable Reliable Datagram (SRD) thing. All of them, in a way, are about addressing deficienci
532.
by jabl 3y ago
Aircraft with such big guns were perhaps not a success, but aircraft with radar, bombs and depth charges became a deadly menace for u-boats.
533.
by jabl 3y ago
So, how have you verified that your statement about this being made up by the author is correct? Or is it something you imagine?
534.
by jabl 3y ago
> This is total nonsense. Of course it is. Hirsch is a well-known Kremlin puppet.
535.
by jabl 3y ago
AFAIU Ardour itself is still using GTK 2, which has no Wayland support. You can search around on the Ardour discourse, occasionally somebody asks about the porting effort to a newer GUI toolkit, but IIRC the Ardour devs think it's too
536.
by jabl 3y ago
In modern x86 we have things like the avx scatter gather instructions, which implement indirect addressing as well as accessing potentially lots of pages in a single instruction. Of course nowadays we have the transistor budgets to make eve
537.
by jabl 3y ago
Another reason many navies like turbines is that big diesels produce a lot of low frequency noise which travels very far underwater, so submarines can hear you coming from a very long distance. Although many navies do operate combinations o
538.
by jabl 3y ago
As mentioned in a sibling comment, turbines don't scale down very well. Boundary layer friction gets relatively worse for smaller turbines, and AFAIU small turbines have relatively larger inefficiency due to air leaking past between th
539.
by jabl 3y ago
It's not only about being able to takeoff and land from a highway. The Gripen is designed to be maintained by conscripts, and the entire maintenance system is designed for dispersed operation from the get-go. E.g. all the usual spare p
540.
by jabl 3y ago
When I was in academia, I was among the first in our department that moved from latex to pdflatex. One of my motivations was that (E)PS files could be huge, particularly for bitmap graphics, whereas pdflatex supports PNG and JPEG as well as

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