binarycoffee

6 ms·

1.
by binarycoffee 9mo ago
I hope you won't mind my picking your brain: which MPSC ring buffer implementations did you find that does drop old items when full? I could only found implementations that are basically re-purposed MPMC, or that cannot deal with non-P
2.
by binarycoffee 2y ago
LOX is apparently MPL, so a bit easier to work with than Nyx' AGPL, but still at odd with the MIT/Apache2 combo that has become the norm in the Rust world.
3.
by binarycoffee 2y ago
Just curious, what kind of simulations do you work on (mission design?) and what libraries would you use in C++?
4.
by binarycoffee 2y ago
Asynchronics | Rust developer | ONSITE or hybrid (2+days/week) | Full time | Warsaw, PL We are a young startup building digital twinning solutions for spacecraft validation & verification. The ideal candidate would have a demonstra
5.
by binarycoffee 2y ago
I can see why someone would prefer Typst over LaTeX when the source is written in Typst or LaTeX, but what are the advantages if your source document is in Markdown? Is there anything else beyond the (presumably) smaller install size of Typ
6.
by binarycoffee 2y ago
Not a solution. Verification emails alone got a small web site I set up to be blacklisted within days. Most of the unwilling recipients presumably couldn't understand the language the verification email was written in and reported it a
7.
by binarycoffee 2y ago
The producers of an MPSC queue may use an AtomicWaker::wake to signal to the consumer that a new item is ready. In this case all wake-ups are necessary (not spurious).
8.
by binarycoffee 2y ago
Another offender is AtomicWaker [1] which does the same on contention. [1] https://docs.rs/atomic-waker/latest/atomic_waker/
9.
by binarycoffee 2y ago
https://crates.io/crates/x
10.
by binarycoffee 2y ago
I needed to reflect Rust enums and went a bit further with that approach. All variants are wrapped in a decorated class, where the decorator automatically computes the union type and adds de/serialization hooks for `cattrs`. @enu
11.
by binarycoffee 2y ago
TBH I consider the C++ `std::chrono` as the worse possible design. `tai_clock::now` does not actually take into account leap seconds. Unless it does, who knows ("Implementations may use a more accurate value of TAI time."). Likewi
12.
by binarycoffee 2y ago
Oh yes, absolutely, GP got it backward and I went along with it...
13.
by binarycoffee 2y ago
While this doesn't change the essence of your claim, the problem is not with UTC timestamps but with Unix timestamps. UTC timestamps (HH:MM:SS) are actually unique because the extra second inserted is assigned the numeral 60. Unix time
14.
by binarycoffee 3y ago
I have always wondered about that. If optimizing repeated atomic loads is indeed allowed, waiting for a signal by spinning on an atomic load could loop forever. Yet I have the feeling most people consider such code to be valid. Are they wro
15.
by binarycoffee 3y ago
While I have frequently seen LabView used for instrument/hardware control, I admit I have never seen people use Simulink for that purpose. Is there a popular Simulink/Matlab add-on for that?
16.
by binarycoffee 3y ago
Sabine Hossenfelder apparently does this [1, 2] for $50/20min. [1] http://backreaction.blogspot.com/p/talk-to-physicist_27.html [2] https://aeon.co/ideas/what-i-learned-as-a-hired-consultant-f
17.
by binarycoffee 3y ago
One may count electric propulsion as a "better" propulsion system, but sadly it was a poor fit for Juice due to the very tight power budget. Even with those gigantic solar arrays, energy management on Juice is extremely challengin
18.
by binarycoffee 4y ago
Not only is the instruction set simple, but the clock-per-instruction cost is deterministic, so assembly code is ideal for real-time I/O. Just like GP, we found that we could often use a PRU in place of an FPGA and dramatically cut dev
19.
by binarycoffee 4y ago
I you think the NASA Open Source License is bad, look at the default license for non-commercial, ESA-funded software [1]. The territorial limitations effectively prevents any form of open distribution, yet the license is open enough to remo
20.
by binarycoffee 4y ago
As others wrote, Pandoc is Haskell so it compiles to a fairly efficient binary. But more importantly, unlike the various Markdown flavors or AsciiDoc, it is incredibly extensible thanks to the combination of custom filters and the possibili
21.
by binarycoffee 4y ago
> Two things can be true at the same time Yes, but it is not possible to assert that both are true at the same time with full certainty.
22.
by binarycoffee 4y ago
You are right of course, but I would contend that generating as well sub-normal floats is in 99.9% of the cases a needless cost. The reason is that, more often than not, all this extra precision will be immediately lost in subsequent operat
23.
by binarycoffee 4y ago
This is a widely used method to map random integers to floating point numbers, but it has the disadvantage of wasting 1 bit of float mantissa precision. On modern CPUs, its computational advantage over full-precision mapping methods, such a
24.
by binarycoffee 4y ago
To be clear, as mentioned in another thread [0] there is no need to ensure consistency between head and tail for a SPSC so storing them in different cache lines would be much better. For the multiple-consumer variant, however, consistency b
25.
by binarycoffee 4y ago
Note that the second variant does not claim to be MPMC, only SPMC. Many lock-free structures use CAS loops. It would not be lock-free if a consumer pre-empted at the wrong time could prevent other consumers to make progress, but I don'
26.
by binarycoffee 4y ago
The multiple-consumer version looks extremely similar, if not identical, to the Go [1] and Tokio [2] local work-stealing queues. These do a bit more though, as they also allow batch stealing operations. [1] https://github.com&#x2
27.
by binarycoffee 5y ago
Thanks for the video, flexure-based designs can be so beautiful. It reminded me of a collaboration I had with a small Swiss company that did wonders with electro-discharge machining such as this flexure-based mechanism machined from a singl
28.
by binarycoffee 5y ago
More of a cutting edge CAD than a breakthrough CAD then?
29.
by binarycoffee 5y ago
Not a stupid question -- sorry for the jargon. It is what is mentioned in this fragment of the article: "When power flows into the EmDrive, the engine warms up. This also causes the fastening elements on the scale to warp, causing the
30.
by binarycoffee 5y ago
Just to be clear, for most anyone with low-thrust measurement experience, thermal drift had been suspect nr 1 from the moment Eagleworks published their work. Here is a comment I made back at that time: https://news.ycombinator.c

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