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rrss

2,096 karma · joined July 3, 2019

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rrss··on Magic-trace – High-resolution traces of what a process is doing
do you mean configuring the other PMUs to interrupt the core every function call / return?

If yes, then yes that is much much higher overhead than processor trace.

rrss··on TSMC to manufacture 2nm chips in 2025. Apple and Intel first to adopt
Taiwan
rrss··on Ask HN: How are pull requests integrated in a repo with high commit frequency?
does bors limit the commit frequency / PR merge frequency to one merge every test runtime (5 minutes in OP), or does it do something more complex and speculate / run some stuff in parallel?

OP’s numbers are 120 commits per hour and 5 minute test run, I’m wondering if adopting bors would necessarily reduce that to 12 commits per hour.

rrss··on Framework Laptop Mainboard
Being able to just buy something that works when you get it is a big plus IMO.

I’ve tried a few times in the last year and finding parts (that are actually available) for a sub- $500 small-form-factor system seems to be beyond my capabilities :)

rrss··on Nvidia R&D chief on how AI is improving chip design
> are any companies other than Nvidia embarking up AI/ML chipmaking in a closed fashion?

https://www.cadence.com/en_US/home/solutions/machine-learnin...

https://www.synopsys.com/implementation-and-signoff/ml-ai-de...

https://www.plm.automation.siemens.com/global/en/our-story/n...

I think you'll be hard pressed to find any company using open source tools to design a business-critical chip for a foundry that gives any information without an NDA.

AFAIK Google doesn't have a open-source ASIC design for OpenTitan, and WD doesn't have an open-source ASIC design for SweRV.

there are a lot of interesting initiatives, but in the semiconductor industry open source tooling and processes are only a tiny niche that a few companies are playing around with.

rrss··on Nvidia R&D chief on how AI is improving chip design
which openroad tools use "AI" rather than normal optimization like traditional EDA tools have used for decades?
rrss··on Large-Scale Matrix Factorization on TPUs
> Btw, as far as I can tell, TPUs are really just a variant of GPUs with an emphasis on lower precision?

GPUs and TPUs have substantially different architectures, it’s not accurate to consider a TPU an a variant of a GPU. See https://dl.acm.org/doi/pdf/10.1145/3360307, particularly section “Contrasting GPU and TPU Architectures”

looking only at the matrix multiply units (and ignoring the hardware multithreading in GPUs that was deliberately not part of the TPU architecture):

TPUv3: 2 cores, 2 128x128 matrix multiply units per core

V100: 80 cores, 8 4x4 matrix multiply units per core

rrss··on Kraken shuts down global headquarters because ‘San Francisco is not safe’
The only info I can find on people who were charged for those retail thefts who have already been sentenced and released are these cases where the DA reduced the felony charges for a misdemeanor plea deal.

https://abc7news.com/connected-cannabis-burglary-bay-area-re...

These cases seem to support the idea that Boudin is part of the problem (going for misdemeanor charges after making a big deal about charging them with felonies - “this is not misdemeanor conduct, this is felony conduct”). Are there other cases you have in mind where the DA actually kept and prosecuted felony charges and the people were later released?

rrss··on AMD Zen microarchitecture and Intel's Ocean Cove patent
something I’ve wondered for a while:

Suppose someone invents something and uses it for their products, but never publishes anything about the invention, and then someone else (years later) independently develops the same thing and gets a patent that covers the first invention.

Is the first person now infringing the patent, or can the fact they were doing it first (even though there is no published info to serve as prior art) give some rights to keep using it?

(I understand any responses are not legal advice and I should ask a lawyer, etc, etc)

rrss··on Tinygrad
> for example the P100 has hardware scheduling, where as the 1080 does not (in the same way at least).

what does hardware scheduling mean in this context?

rrss··on Open-source drivers according to Habana
because many times people want to be able to run new drivers (e.g. with new hardware support) on an LTS kernel.

lots of vendors support this, and most do it by maintaining a version of their driver that can work with a wide range of kernel versions that detect and adapt to what APIs get added/renamed/removed.

rrss··on Teaching is a slow process of becoming everything you hate
removed
rrss··on Teaching is a slow process of becoming everything you hate
I do not understand how self directed learning like this is expected to work at all for children.

If you replace a high school with letting the students do whatever interests them, a small fraction might study something, and the majority will spend the time watching tiktok, playing league or legends / fortnite, listening to music, etc. maybe you think that letting kids do whatever they want for “education” like this is better, but IMO this proposal is much worse than the current system of directing students to spend time on things that are moderately useful to society and determined to be valuable to intellectual development

rrss··on Here comes the first TikTok war
regarding prop 22's 7/8ths, i commented on this at the time: https://news.ycombinator.com/item?id=24867819

IIRC, the comment to which I replied reflected a pretty common understanding of the issue and was in some of the reporting on prop 22.

rrss··on Ukraine calls on hacker underground to defend against Russia
> If you have to ask

> Only if you’re an amateur

rrss··on History's deadliest air raid happened in Tokyo during World War II (2020)
The first two risks are only unchanged for a demonstration that was not announced to japan, and IMO a demonstration of a nuclear bomb without telling Japan to observe it would not have been effective.

After the bombing of Hiroshima, Suzuki stated to the press that Japan would not surrender, which suggests to me that bombing the middle of nowhere as a demonstration would probably not have persuaded the Japanese government to surrender. Why would a non military demonstration have been more impactful than bombing a city?

rrss··on Finding the average of two unsigned integers without overflow
> The only thing this patent covers is the physical circuit implementation

The claims in that patent are not limited to a physical circuit implementation.

The description includes a circuit diagram as one possible embodiment of the claimed invention, but the patent covers any implementation (and the description indicates it was intended to cover instructions running on general purpose processors).

rrss··on Finding the average of two unsigned integers without overflow
yes, this is linked from the article
rrss··on Finding the average of two unsigned integers without overflow
yes, you are right. meaningful voluntary collective change is unlikely.

however, i believe that individuals should respect the commons, and don’t believe in the tragedy of the commons as an excuse for individual actions that contribute to the problem.

(insert starfish on the beach story)

rrss··on Finding the average of two unsigned integers without overflow
the world would be better if more companies were able or daring enough to fight bullshit patents directly (with prior art, obviousness, etc defenses).

but instead every company chooses to defend themselves by deluging the patent office with more crap, and collective abuse of the patent system to patent stuff even the “inventor” thinks is obvious becomes accepted totally normal behavior.

rrss··on Finding the average of two unsigned integers without overflow
I disagree. Not all the claims include the “single instruction cycle,” and IMO several of the claims are general enough that one could make a case that a sequence of instructions directing the operation of a general purpose data path would be covered by the claim. (Claim 3, for example).

this would require a lawsuit to find out, but this wording in the description suggests the authors’ intent with the claims was to patent this method of computing an average on any processor:

> A general purpose computer or processor with suitable circuitry can execute the invention in a single instruction cycle (as is preferred) or multiple instruction cycles.

rrss··on Magic-trace: Diagnose tricky performance issues with Intel Processor Trace
It seems like this is basically unavoidable on existing hardware, though, right?

if we imagine there existed some visualization that could more accurately represent the complexity of a core, I don’t know how it would be possible to get the data, because AFAIK there are no methods to trace processor execution for modern processors at higher fidelity than this.

even sampling profilers have similar issues with being limited to the model of sequential instruction streams, since each sample gives a single program counter, not the full view of everything the core has in flight.

rrss··on Webb flies Ariane 5: watch the launch live on 25 December
lol

thanks for the treatise on the consequences of a few more days delay, but all I’ve said is that I find it amusing that the launch has ended up on Christmas day. They could have conceivably tried to avoid the holidays, but obviously they are not, and this is fine.

rrss··on Webb flies Ariane 5: watch the launch live on 25 December
my personal preference is irrelevant. my comment was regarding whether it is tractable to plan around Christmas, or unreasonable because there are too many holidays of comparable significance.
rrss··on Webb flies Ariane 5: watch the launch live on 25 December
I did not get your real or feigned ignorance that Christmas is a much more significant holiday to the vast majority of the people involved than the Feast of the Ass.

I also hope all goes well. Cheers.

rrss··on Webb flies Ariane 5: watch the launch live on 25 December
Cool.

Webb will be monitored and operated by NASA in Maryland.

https://en.m.wikipedia.org/wiki/James_Webb_Space_Telescope#T...

https://en.m.wikipedia.org/wiki/Space_Telescope_Science_Inst...

rrss··on Webb flies Ariane 5: watch the launch live on 25 December
They did though. It was delayed, they chose to delay it from October to December 18 to December 22 to Christmas instead of like the first week of January or whatever.

It’s not like this thing is launching to Mars and they’d have to wait a couple years if they miss this week - it could launch on 210 days of each year.

https://jwst.nasa.gov/content/about/faqs/faq.html#launchWind...

I don’t mind at all, I just think it’s a bit funny.

rrss··on Webb flies Ariane 5: watch the launch live on 25 December
How about planning around the single most celebrated holiday in the US, religious or not: https://en.m.wikipedia.org/wiki/Public_holidays_in_the_Unite...
rrss··on Webb flies Ariane 5: watch the launch live on 25 December
> It wasn’t originally planned for tomorrow

Right, it was originally planned for 2007.

It is sorta funny that after 14 years of delays they picked the week of Christmas.

rrss··on Webb flies Ariane 5: watch the launch live on 25 December
It looks like it was even before Falcon 1’s first success.
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