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frankchn

948 karma · joined August 23, 2010

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frankchn··on 72% of smart TVs and 46% of game consoles hardcode DNS settings
It doesn’t matter to the device OEM when the customer demands a refund because the device stopped working, even though the root cause is the ISP hijacking the DNS request and the device OEM has nothing to do with it. Easier to work around this apparently common ISP practice.
frankchn··on Would you be willing to fund a Linux port to Apple Silicon?
I don't think the "developers who want a high performance ARM laptop" niche is large enough for any serious hardware manufacturer to address.
frankchn··on Would you be willing to fund a Linux port to Apple Silicon?
The A14 is significantly faster than the Kirin 9000 (Cortex A77 on TSMC 5nm) on SPECint and SPECfp: https://www.anandtech.com/show/16226/apple-silicon-m1-a14-de...
frankchn··on Would you be willing to fund a Linux port to Apple Silicon?
> Apple has already laid the architectural groundwork, a chip with similar performance numbers can probably be commissioned with ~50 million.

I think you might be two orders of magnitude off here. A class leading general purpose compute chip on a cutting edge process? I don’t think $5 billion to produce working chips is unreasonable. If it were only $50M to produce A14/M1 level chips, Qualcomm would already have done so.

Cerebras is cool, but they are not on TSMC 5nm and don’t have to design general purpose silicon, where you have pesky things like huge reorder buffers or 8-wide decode blocks, which are not seen in any other production CPU right now.

frankchn··on iOS14 reveals that TikTok may snoop clipboard contents every few keystrokes
> If the notifications are frustrating, users will turn off the permissions or remove the application entirely. Crappy snooping applications are gone. Mission accomplished.

Will they? That didn’t happen with the UAC dialogs in Windows.

frankchn··on Dow rallies more than 700 points after record surge in U.S. jobs
The correction would be about 3% if we reclassify those as unemployed: https://www.bls.gov/news.release/pdf/empsit.pdf

> If the workers who were recorded as employed but absent from work due to “other reasons” (over and above the number absent for other reasons in a typical May) had been classified as unemployed on temporary layoff, the overall unemployment rate would have been about 3 percentage points higher than reported (on a not seasonally adjusted basis). However, according to usual practice, the data from the household survey are accepted as recorded. To maintain data integrity, no ad hoc actions are taken to reclassify survey responses.

If you apply the correction, the rate would be 16.3%.

frankchn··on Dow rallies more than 700 points after record surge in U.S. jobs
They did disclose survey response anomalies in the report: https://www.bls.gov/news.release/pdf/empsit.pdf

> If the workers who were recorded as employed but absent from work due to “other reasons” (over and above the number absent for other reasons in a typical May) had been classified as unemployed on temporary layoff, the overall unemployment rate would have been about 3 percentage points higher than reported (on a not seasonally adjusted basis). However, according to usual practice, the data from the household survey are accepted as recorded. To maintain data integrity, no ad hoc actions are taken to reclassify survey responses.

If you apply the correction, the rate would be 16.3%.

frankchn··on Nvidia CEO Introduces Nvidia Ampere Architecture, Nvidia A100 GPU
Actually it looks like the double precision number in general GPU usage only went up 25% (Volta did 7.8 TFLOPS). To get the 2.5x number, you need to use FP64 in conjunction with TensorCores, which then gets you 19.5 TFLOPS.

Considering how big the die is (826mm^2 @ TSMC 7nm) and how many transistors there are, they really must have beefed up the TensorCores much more than the general compute units.

frankchn··on Nvidia CEO Introduces Nvidia Ampere Architecture, Nvidia A100 GPU
The double-precision number probably best represents the generational improvement.

The 20x 32-bit floating point improvement is probably achieved by comparing doing full FP32 calculations on the previous generation vs doing TF32 calculations on Ampere. This would not be an apple-to-apple comparison as the TF32 result is less precise.

That said, it is probably not terribly important for deep learning at least, given the success of BF16.

frankchn··on Nvidia CEO Introduces Nvidia Ampere Architecture, Nvidia A100 GPU
It seems like the TF32 format is similar to BF16 but with 3 more precision bits (in other words, it is FP32 with 13 low-order bits dropped instead of 16).

Full adders in FP units scale with the square of the mantissa bits, so if the number of mantissa bits stay the same, they can reuse the existing units.

Since Nvidia already has existing FP16 units on die, using those units for TF32 calculations probably doesn't cost too much additional die area.

frankchn··on Oil plunges below zero for first time with May contract ending
That’s true but not really relevant here. if traders are holding on to any open contracts for May past tomorrow, then I believe they will have to take physical delivery.

Thus, traders who still have contracts open but cannot take physical delivery will have to close their positions out today or tomorrow, thus causing the dip we are seeing.

frankchn··on Oil plunges below zero for first time with May contract ending
The CME Crude Oil Futures Contract is settled through delivery at Cushing, OK: https://www.cmegroup.com/trading/energy/crude-oil/light-swee...
frankchn··on Oil plunges below zero for first time with May contract ending
Note that this is for the May contract, which closes tomorrow, and anyone left with a contract then will have to actually take delivery of the physical product. Since we are in supercontango (oil storage is full, causing spot prices to be significantly lower than forward prices), I am guessing that traders who are still holding on to contracts and don’t have available storage have to unload contracts pretty quickly.

The June contract, where most of the trading is happening, is at around $22, and the July contract is $28.

frankchn··on D, L-lysine acetylsalicylate and glycine Impairs Coronavirus Replication (2016) [pdf]
According to https://academic.oup.com/cid/article/49/9/1405/301441, the aspirin doses that were used in 1918 (8.0 - 31.2 g/day) were much higher than what people normally take today (usually a max of 3.6g or so).
frankchn··on Pro drivers are competing with gamers after F1 and Nascar canceled races
True, but an F1 car is on another level with 900+ hp (including ERS) at 740 kg with driver but not fuel.
frankchn··on Mac OS Catalina: more trouble than it’s worth (Part 2)
Adding friction will more likely resulting in most users blindly giving permissions to anything that asks for it. We’ve seen this before with the endless UAC dialogs in Windows Vista.
frankchn··on Cerebras’s giant chip will smash deep learning’s speed barrier
Chiplet designs means that you still have to route signals either onto an interposer or onto a PCB. If you have a silicon interposer you have the same issue of making a really large silicon die. If you route into the PCB, then you may need SerDes depending on what you do and bandwidth will be lower and latency will be higher due to signal integrity issues.

Maybe something like Intel's EMIB technology where they have small interposers along edges of chips rather than having a giant interposer might help here.

Yields are probably fairly good if they design for manufacturing by placing extra cores / wires to route around failures as I am sure they are.

frankchn··on Coming Soon – Graviton2-Powered General Purpose EC2 Instances
Does the Neoverse core have hyperthreading? I know that vCPU threads on the major cloud providers are hyperthreads instead of real hardware cores.
frankchn··on WeWork says will file to withdraw IPO
A big difference is that AirBnB (and Uber, Lyft, etc...) don’t own or lease any of the underlying assets (apartments, cars) but are purely middlemen.
frankchn··on NULL license plate not such a bright idea
Relevant xkcd: https://xkcd.com/1105/
frankchn··on AMD Rome Second Generation EPYC Review: 2x 64-core Benchmarked
Amazon already has 1st generation EPYC servers available: https://aws.amazon.com/ec2/amd/ so I assume they will follow up as well.
frankchn··on Equifax Is Said to Be Near $650M Settlement for Data Breach
That’s the beauty of their business model — you can only opt out by opting out of most of banking altogether.
frankchn··on H-1B: Federal judge backs government’s narrower view of ‘specialty occupation’
Your new employer has to file a H1B petition de novo, with the only difference that you are not subject to the lottery any more. USCIS may well take the view that your new job, even if it is doing the same thing, is not a specialty occupation any more.
frankchn··on Cloud TPU Pods Break AI Training Records
I think hardware acquisition costs can dominate GPU prices, so perf/watt might not be a realistic measure for the cost of running such large scale/high performance experiments.

For instance, the DGX-2 has an MSRP of $399,000 and consumes 10 kW of power [1]. The average commercial electricity cost across the US is about $0.11/kWh [2], so a DGX-2 running at full tilt costs $1.10 an hour in electricity. Thus, a DGX-2 running at 100% utilization for 3 years costs $9,636 in electricity, which is ~2.5% of the cost of the box itself.

Of course, you probably could get DGX-2s for a lot cheaper if you are buying 100 of them, but the acquisition costs are still going to be significant vis-a-vis power costs.

[1]: https://www.anandtech.com/show/12587/nvidias-dgx2-sixteen-v1...

[2]: https://www.pacificpower.net/about/rr/cpc.html

frankchn··on BMW CEO to quit after carmaker loses early lead in electrics
Vehicles getting bigger is a trend in general across all manufacturers and all vehicle categories, from the Toyota Corolla to the Lincoln Navigator. I think the only car I can think of which hasn’t gotten bigger and heavier over the years is the Mazda Miata.
frankchn··on BMW CEO to quit after carmaker loses early lead in electrics
BMW ultimately is in the business of selling cars, not preserving a brand legacy. All the German brands are doing the same — AMG and S aren’t what they once were. Even Porsche GT cars are more pliant and daily-able than ever.
frankchn··on AMD EPYC “Rome” Server Processors to Feature 8 to 64 Cores
Two tapeouts, one for the IO die and one for the 8-core chiplet. For lower core count versions they can simply leave chiplet slots blank: https://img.purch.com/o/aHR0cDovL21lZGlhLmJlc3RvZm1pY3JvLmNv...
frankchn··on L.A.’s Elite on Edge as Prosecutors Pursue More Parents in Admissions Scandal
I think a key difference here is that the McMarksFace building is given to the university, while the bribery scandal involves giving money to individuals. An analogy would be "buying" a car by giving $5k to the salesperson to get the keys rather than $50k to the dealership to actually buy it.
frankchn··on Intel Stockpiling 10nm Chips
Xeons, even at wholesale prices, are probably much more profitable than laptop chips though.
frankchn··on Tesla Posts Big Quarterly Loss as Its Electric-Car Sales Lag
The fact that they will stay competitive is already priced in, given that Tesla is by market cap about the size of GM and Ford. However, I find some of the loftier predictions of analysts ($1000+/share) somewhat unjustifiable at present.

I wonder if Tesla should not have entered the mass market with the 3 and stuck with the S and X. Higher margins and lower CapEx there.

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