jabl

53 ms·

841.
by jabl 4y ago
That's a sodium cooled reactor, not a molten salt reactor. Sodium is a metal, not a salt.
842.
by jabl 4y ago
As I mention in a sibling comment, I made an updated version that works on a modern Linux system ( https://github.com/jabl/fsv ), but, uh, useful? Nope, it's a gimmick or a toy, not something you'd actually us
843.
by jabl 4y ago
There's a version for OpenGL called fsv, and I made an updated version that works on a somewhat modern Linux system (Gtk+3, core OpenGL 3.x) at https://github.com/jabl/fsv
844.
by jabl 4y ago
IIRC it's a combination of air travel continuing to expand at the roughly 2.5% yearly rate it has been doing for the past decades, and other sectors of the economy successfully decarbonizing.
845.
by jabl 4y ago
Pi is a bit special because in order to get accurate argument reduction for trigonometric functions you needs lots of digits (IIRC ~1000 for double precision). E.g. https://redirect.cs.umbc.edu/~phatak/645/supl&#x2
846.
by jabl 4y ago
And then turtles. After that it's turtles all the way down.
847.
by jabl 4y ago
I tend to prefer b2sum (BLAKE2), as it's both fast and (at the time of writing this, AFAIK) secure. There are certainly situations where md5 is good enough, but yeah, I feel safer just using blake2 and not having to spend brain cycles
848.
by jabl 4y ago
Based on a quick test here on a 417MB .tar.gz file I had lying around, best of 5 times for various coreutils (8.32) implementations: - md5sum: 0.570s - sha1sum: 0.667s - sha256sum: 1.662s - sha512sum: 1.011s - b2sum: 0.486s - cksum: 0.982s
849.
by jabl 4y ago
BART was designed by aerospace engineers. They wanted to minimize weight. In order for the light-weight cars to not tip over in windy conditions they needed a broader gauge.
850.
by jabl 4y ago
From what I've read (I think there was discussion on HN about it a few months ago?), it's not only the gauge. The entire system was a 'clean sheet' design, made by aerospace engineers. Everything is totally different fro
851.
by jabl 4y ago
I don't work in safety-critical hard real-time systems, but isn't this the standard approach when upgrading such a system?
852.
by jabl 4y ago
The 'innovation' in RISC-V is not the ISA itself, which in many ways is a pretty standard conservative RISC, although one that by virtue of being later to the game has avoided many historical missteps like delay slots or register
853.
by jabl 4y ago
Well, there's the NASA doing manned launches (or nowadays, working towards eventually being able to, to put it charitably) which, as you say, sadly seems co-opted by pork-barrel interests. But there's also the science side of NASA
854.
by jabl 4y ago
Doubling the thrust is likely overall a bad idea, for the reasons you mention. Also looking at other posts in this discussion, it seems the 4-engine option (4x 150kN class size engines to provide about same overall thrust) was discarded bec
855.
by jabl 4y ago
Hmm, I'm not familiar enough with jet engines to say whether that is expected or not. 15% doesn't sound like a huge improvement, I agree. But I'll note the F130 is a medium bypass business jet engine producing 'only&#x27
856.
by jabl 4y ago
They're still using the original TF33 engine they were delivered with in 1961. Presumably the fan blades have been replaced many times over during maintenance, but I don't know if there's any advantage to switching to better
857.
by jabl 4y ago
https://lwn.net/Articles/905931/ for background information on this.
858.
by jabl 4y ago
There's the i_version field in the inode structure which is pretty close to that. Though I'm not sure it's accessible to user space, or whether it's used only by the kernel NFS server.
859.
by jabl 4y ago
> I’m struggling to reconcile that take on events with a desire for thawing hostilities and mutual prosperity. My point is that I think the argument that trade by itself brings about mutual understanding and prosperity is fatally flawed.
860.
by jabl 4y ago
> we use electricity for heating a lot (gas furnaces at homes are very rare). That's a kind of a blessing actually. As opposed to central Europe, Finland is not that dependent on gas from Russia. Electricity can be produced without
861.
by jabl 4y ago
> Would it be fair to summarise that policy as “bilateral trade will stop countries killing each other”? Trade between like-minded nations is awesome; the EU itself largely has its origins in a wish to avoid yet another disastrous world
862.
by jabl 4y ago
It's really not that bleak, Finland certainly has other advantages than cheap electricity. But yes, a big change is coming and we'll see whether leaders have the chutzpah to capitalize on that opportunity; if not, yes going back t
863.
by jabl 4y ago
> edit: Obviously the electricity produced by the nuclear plants is used in district heating to power heat pumps but that is very inefficient (already ~60% loss just from heat -> electricity at the nuclear plant). Well, heat pumps are
864.
by jabl 4y ago
Sure, electricity is in some sense a pretty artificial market with the auctions and system operator etc etc. OTOH, commodities generally price at the margin, and the rules for the electricity market have been designed to mimic this price fi
865.
by jabl 4y ago
I recall, with some amusement, the uproar this caused when proposed a decade ago. Luckily sanity prevailed over the kneejerkers in the end, and today our systems are a little bit simpler, and another tiny gratuitous portability issue is no
866.
by jabl 4y ago
The somewhat old and AFAIU no longer maintained FHS contains explanations https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html tl;dr: /usr/local - Place for the system administrator to put local s
867.
by jabl 4y ago
Can you even buy one without running afoul of ITAR? I'm slightly surprised you could even buy a rad-hardened microcontroller, but maybe microcontrollers are considered simple enough that they are exempt?
868.
by jabl 4y ago
Per https://www.theregister.com/2022/09/06/nasas_spaceflight_com... this was developed for the HPSC program whose goal was to develop a replacement for the RAD750, and the "100 times performance" re
869.
by jabl 4y ago
Does that, in practice, mean military, or civilian aerospace?
870.
by jabl 4y ago
> Compilers have had many years of work put into generating optimal instruction sequences for POWER. That is all flushed away moving to RISC-V. Well, to an extent. If one looks at GCC at least (presumably LLVM as well, although I don&#x2

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