Hacker Newsnew | past | comments | ask | show | jobs | submit | mumumu's commentslogin

In hardware engineering this is called critical path.


That is about latency, but Amdahl's law is about throughput I think.


Amdahl's law is not about latency or throughput, it is about optimizing one part of a program having diminishing returns relative to the part that isn't optimized. It is not really a law, it is more common sense that most people would never assume needs to be explicitly said.


Amdahl's law is common sense, but also the one of the reasons premature optimization is the root of all evil.

A small speedup on the longest (by time) part of the program is usually better than infinite speedup on a short part of the program.


It seems the limit does not apply to Quotes and Liked tab on users profiles.


This made me giggle because when they turned off the free API I was using to copy images from tweets I liked so I'd have a backup copy, I replaced my script with a selenium using one that surely costs twitter more in resources. All it does is load my liked page and scroll down for several minutes collecting media as it goes.


The bottleneck is bandwidth and storage not computer power.

Data from sensor and to display are usually (but not always) raw and uncompressed.

To go beyond 8k 120fps we will need fiber, or better compression.

We have good codecs to move data online. And specialized ASIC to do live encoding with good quality.

The current compression defined by HDMI is very rudimentary.


Power is definitely a major factor. Unless games do not exist in your world


Games do not exist in my world. Playing games is a waste of silicon, and human potential.


You're not the person I replied to. Why the hell did you respond to this. Having a bad day or something?

Quite ironic to complain about waste at the same time as making this pointless and aggressive comment


>Power is definitely a major factor. Unless games do not exist in your world

Maybe you don't realize you're on a worldwide forum where anyone can respond to anyone else for any reason? I'm perfectly entitled to respond to your comment as someone who does not game. The person you replied to isn't the only person in this entire thread. And suggesting that it's strange for me to reply to your comment is just strange in itself.


How does commenting on anonymous forums rank in your world?


For the 10 minutes every other day I spend doing it, it's just fine. I don't waste hours gaming like some people. LCD displays interest me, and so I came into the thread - is that reasonable enough to satisfy your question?


Also detonation. It Could make Rotation Detonation Engines possible.


Could you expand on that? I know just a little about detonation engines, and can’t fathom how this is related.


Flow instability is one of the biggest challenges to get them to operate for long time without blowing up. Of course, there are others.

Any progress on the control of chaotic flow is great news. Even at subsonic speed.


A very good point.


“[Balloons] have extremely small radar and thermal cross sections, making them relatively invulnerable to most traditional tracking and targeting method".

https://www.thedrive.com/the-war-zone/why-shooting-down-chin...


They have smaller cross section than many stealth jets:

https://www.thedrive.com/the-war-zone/why-shooting-down-chin...


From the article, a good explanation for why recent incidents used missiles rather than the cannons (among other reasons):

“In 1998, a rogue weather balloon from Canada deployed to measure ozone levels accidentally drifted away. BBC reported at the time that the airship was the size of a 25-story building and was operating at an altitude between 27,000 and 37,000 feet, so admittedly much lower than China’s balloon is now. The incursion prompted attempts from Canada, the United Kingdom, and the United States to shoot it down, with two Canadian Air Force CF-18 Hornet fighters firing more than 1,000 rounds of ammunition from their own Vulcan cannons into the balloon off the coast of Newfoundland. That balloon took days to come down, at one point even gaining altitude and drifting across Canada and then out over the Atlantic Ocean, which made for a problematic situation for regional air traffic.”


Alder Lake and Raptor Lake workstation (W680 Chipset) doesn't have AVX512 enabled.


Fair. The "entry workstation" thing from Intel is baffling. I was thinking Xeon W, but then of course there was the Xeon W-12xx that lacked AVX-512.

In short, I was wrong. It would have been more correct to say that Intel has offered a workstation part with AVX-512 continuously since Skylake.


Intel released a couple days ago new Xeon-W CPUs with AVX-512.

The wx-24xx uses the same p-cores as alder lake, but with avx-521 enabled. Same for wx-34xx but with raptor lake's p-core.

The entry levels xeon are believed to be identical to Core ix, with the e-cores disabled and avx-512 enabled. The extra I/O and ECC support is done by the chipset.

In summary, they just went to support avx-512 only on xeon w.

This makes sense, since must be hard to schedule between cores with and w/o avx (the e-cores doesn't have avx).


Sad, big win for the Ryzen or future Zen 4 threadripper.


Now we only need a consumer CPU from Intel with AVX-512 enabled.


For consumer cpus, you can go back to 11th Gen Intel if you want avx-512 support.[1] Not ideal, I know.

[1] https://blog.reyem.dev/post/which-consumer-computers-support...


Not listed on that page is the Microsoft Surface Laptop Go, which has the same i5-1135G7 as the X1 Carbon listed.

It appears that MS is clearing out their remaining stock with discounts, and they are really nice little machines with outstanding build quality, very good keyboards, and a 3:2 touchscreen.

It was never a popular machine, I think it had very unfortunate naming which leads people to confuse it with other MS products. You have to think of it as something like a super-premium Chromebook to understand what it is for. But regardless, you can dump Windows and install Linux just fine.


RIP Icelake, we hardly knew you.


I don't think Apple has interest in small markets. They are really good at making stuff at huge volumes.


Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: