twtw

12 ms·

61.
by twtw 8y ago
> AMD hardware is known to be better for GPGPU for a long time already. Maybe, maybe not, but the async compute argument you are making only applies to graphics applications that use compute shaders on maxwell - it doesn't apply to
62.
by twtw 8y ago
They could drop graphics support on Linux with no significant losses to their hpc/ml market.
63.
by twtw 8y ago
The real-world progression of software run over time on processors doesn't always match the assumption in amdahl's law. Frequently people want to solve harder/bigger problems in the same time, not just the same problem in les
64.
by twtw 8y ago
The ebpf is not the exploit. The ebpf was used in the proof of concept to generate a gadget in the victim process (in this case the kernel). Similar code patterns already existed in the kernel, the authors just used ebpf to make their own
65.
by twtw 8y ago
cuBLAS does GEMM.
66.
by twtw 8y ago
> But it only affect,as a first approximation, processes that try to execute code with different trust domains in the same address space This is wrong, even as an approximation. This comment, as well as your other comments on this thread
67.
by twtw 8y ago
What you are describing here is high cost, because you have to take care of coherence when the line is committed to the cache, which in your scenario would not be speculative. That would require notifying the other cores and potentially ref
68.
by twtw 8y ago
Sure, I get it. Perhaps I phrased my response poorly. This comment: > What needs to die is the belief that you can rely on just software (i.e. memory safety) for isolation between trusted and untrusted code is an argument that doubting i
69.
by twtw 8y ago
Given the phrase "Intel funded" 'childintime is probably confused and thinks AMD Zen is not vulnerable.
70.
by twtw 8y ago
> What needs to die is the belief that you can rely on just software (i.e. memory safety) for isolation between trusted and untrusted code[1]. I don't understand how you came to this conclusion. How does spectre indicate that you ca
71.
by twtw 8y ago
That's very unlikely. 16 GB of HBM2 alone probably costs AMD around $300, and HBM2 prices are unlikely to fall soon (they've actually been trending up, if what I've read is to be believed).
72.
by twtw 8y ago
I'm sorta surprised that the specs are so similar to the MI50. Seems like this might cannibalize the sales of MI50 for applications that don't use fp64 (i.e. all ML/DL uses).
73.
by twtw 8y ago
> and then tried to hide it to the fullest extent possible I haven't seen any evidence of this. It's definitely not supported by this NYTimes article. Do you have a source?
74.
by twtw 8y ago
> have dozens of seconds to respond 12 minutes, in this case.
75.
by twtw 8y ago
It's not really possible to not know that you are dealing with a runaway stabilizer. MCAS (and every other automatic system to adjust trim) causes large physical wheels at the side of the pilot's knee to spin.
76.
by twtw 8y ago
For reference, here is the runaway stabilizer memory item (the "checklist") for 737: 1. Control column ............................. Hold firmly 2. Autopilot (if engaged) ..................... Disengage 3. IF the runaway stops: --
77.
by twtw 8y ago
And yet the pilots of the previous flight flipped the cutout switches. EDIT: ... Presumably because it's literally the second thing on the list of things to do in the case of a runaway stabilizer.
78.
by twtw 8y ago
The point is that their response may have worked for this particular fault, but would not have worked in general. There is a reason that there are more procedures than "pull back on the stick" - pilots do not know what the fault i
79.
by twtw 8y ago
> Pilot trained this situation and plane did X and now does Y - you don't really see the problem? - now pilot has extra burden to quickly determine if something else is wrong as plane behaves differently than pilot was trained to. T
80.
by twtw 8y ago
I do not think this is a good analogy. Firstly, there is no single equivalent to "slamming on the brakes" for uncommanded nose-down. This could be caused by a variety of faults, and pilots are trained to respond in a fashion that
81.
by twtw 8y ago
> and additional regulation is going to be needed to make sure this doesn't happen in the future. Given that the FAA made the decision that it was fine to not retrain the pilots, sounds like there's going to have to be someone
82.
by twtw 8y ago
In addition to the resources other have mentioned, I've found this http://pages.cs.wisc.edu/~remzi/OSTEP/ valuable.
83.
by twtw 8y ago
I can't tell if that's saying that it didn't completely fail, or that it completely succeeded.
84.
by twtw 8y ago
Like the author? https://news.ycombinator.com/item?id=19070587
85.
by twtw 8y ago
In my experience, writing "scary" software like a compiler, an OS, a kernel driver, etc is more about bravery/daring than raw skill or intellect. There are quite a few people that know C and C++ in high school, so it seems re
86.
by twtw 8y ago
I thought it was fairly clear 'q3k was referring to the 64 bit ISA introduced in amd64, not all the legacy stuff either kept around in some form for compatibility (x87, encodings) or stuff that isn't part of long mode (BCD, segmen
87.
by twtw 8y ago
> Took me a while, but I got 97% efficiency with single core DGEMM. In my experience, it's pretty widely accepted that VLIW (and EPIC) can achieve high performance and efficiency on highly regular tasks such as GEMM and FFT. That&#x
88.
by twtw 8y ago
I don't think "Silicon Valley" is the descriptor you are looking for here. Intel and HP (where the people "supporting and incrementally enhancing" itanium hw & sw work) are very much Silicon Valley companies.
89.
by twtw 8y ago
> I pay $3000 for a one bedroom > If I could move, I would. If you don't mind, why can't you move? Caring for family members?
90.
by twtw 8y ago
> Russian officials have raced to portray the United States as the nation at fault. > They charge that American missile defense interceptors in Eastern Europe could be easily refashioned into offensive weapons, and that the rise of ar

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