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irishjohnnie

247 karma · joined September 30, 2013

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irishjohnnie··on AMD Announces 7950X3D, 7900X3D Upto 128MB L3 Cache
I believe it is both a scheduling and memory allocation/loading issue. It is interesting that caches are NUMA but main memory is not.
irishjohnnie··on DARPA wants to combine traditional sealift and airlift
Are you referring to the ballpark "specifications" in the article? If so, I don't know of any material that can withstand the stresses of the weights and speeds mentioned in it ... unless you are going for really low wing loading (think dirigible).
irishjohnnie··on The Great Resignation? More Like the Great Renegotiation
Current inflation is mostly supply-side driven. Having said that, M2's biggest jump in its history was in early 2020 (see https://fred.stlouisfed.org/series/M2SL). Its slope before and after is more or less the same. However, I don't think inflation will lag it by more than a year.
irishjohnnie··on How to design a sailing ship for the 21st century?
Yup. OceanWings by VPLP https://www.hellenicshippingnews.com/vplp-design-signs-its-f...
irishjohnnie··on A new design ship in the Philippines is partly powered by wave energy
> It’s honestly a shame that we didn’t keep pursuing sail technology ...

You mean something like this? https://www.top-yachtdesign.com/oceanwings-by-vplp/

irishjohnnie··on Americans are getting more nervous about what they say in public
ICYMI lots of issues with that study, https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa155... https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa156...
irishjohnnie··on Americans are getting more nervous about what they say in public
It also looks like that study is still in the peer review process. It has the "Accepted Manuscript" flag (https://academic.oup.com/aje/pages/Instructions_To_Authors) and has at least one major error, https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa155...
irishjohnnie··on Americans are getting more nervous about what they say in public
> Covid is an autoimmune disease. The Over active immune response is what is killing people.

The virus triggers an acute immune response. This is not the same as an autoimmune disease, it may be the opposite. Also, people with certain blood types that have better clotting ability seem to be at a disadvantage.

irishjohnnie··on Americans are getting more nervous about what they say in public
There is also a glaring conflict of interest regarding the author of that paper and some manufacturers of the drugs in question, https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa156...
irishjohnnie··on Why should I have written ZeroMQ in C, not C++ (2012)
I missed this in my previous reply ...

> Look at all the results. Even before that exceptions are more often a win than a loss.

The blog post you linked to effectively says "it depends"

irishjohnnie··on Why should I have written ZeroMQ in C, not C++ (2012)
> But on 64-bit windows the default exception handling (SEH) uses a similar mechanism than Linux and should have comparable performance.

AFAIK SEH in Windows calls RaiseException() which in turn causes a user/kernel mode transition, probes for exception/termination handlers, and vectored exception handlers depending on the severity. It's been a while but I'm not sure the code GCC generates in Linux is quite like this.

irishjohnnie··on Why should I have written ZeroMQ in C, not C++ (2012)
> benchmarks have shown that exceptions are generally faster

The blog post you linked to says "Immediately we see that once the stack depth grows above a certain size (here 200/3 = 66), exceptions are always faster. This is not very interesting, because call stacks are usually not this deep (enterprise Java notwithstanding). For lower depths there is a lot of noise, especially for GCC ..." So ... not exactly "generally faster".

Also, the test is only for Linux. The same test on Windows/VC++ will probably run a lot slower ... again not "generally faster"

irishjohnnie··on Bosch Smart glasses: A tiny laser array paints images directly onto your retina
https://jetpackaviation.com/jetpack-training-lp/
irishjohnnie··on America’s Fastest Spy Plane May Be Back and Hypersonic
Video from SciTech conference https://livestream.com/accounts/6056055/events/8001237/video... starting at around 41 minutes
irishjohnnie··on AMD's Future in Servers: New 7000-Series CPUs Launched and EPYC Analysis
I was referring to the RTL-based IP that goes into each subsystem of the CPU, hence the analogy to code. You're talking about compiler instruction scheduling, a lot of which are a bunch of non-AI algorithms. If I'm missing something, I would appreciate the references to the functionality you're referring to.
irishjohnnie··on AMD's Future in Servers: New 7000-Series CPUs Launched and EPYC Analysis
Probably not. Do you use AI to write code?
irishjohnnie··on AMD's Future in Servers: New 7000-Series CPUs Launched and EPYC Analysis
Wow! AMD EPYC + Xilinx FPGA!
irishjohnnie··on Hardware is the new software
You mean like Xilinx's Zynq? https://www.xilinx.com/products/silicon-devices/soc/zynq-700...
irishjohnnie··on Disruptor: High performance alternative to bounded queues (2011) [pdf]
Ring buffers are also used in web servers, database servers, different kinds of device drivers protocol stacks, constrained embedded devices, etc.
irishjohnnie··on Disruptor: High performance alternative to bounded queues (2011) [pdf]
IIRC, the data structure that they used was not thread-safe. There eventually had to be an interlocked compare exchange operation which slowed throughput. Also, I couldn't imagine this working correctly in out-of-order cores without memory barriers at the very least.
irishjohnnie··on Disruptor: High performance alternative to bounded queues (2011) [pdf]
It's been a while, but didn't the performance turn out to be similar to other data structures in multi-socket scenarios because it requires interlocked -type instructions?
irishjohnnie··on Distributed systems in an alternative universe
Wouldn't the equivalent of that be a JTAG debugger for the NIC?
irishjohnnie··on Distributed systems in an alternative universe
I think the closest thing to a Wireshark for CPUs is Intel VTune (https://software.intel.com/en-us/intel-vtune-amplifier-xe)
irishjohnnie··on The Case Against ISP Tolls
Yes, "trying to get paid twice" is what "extract more rent" and "rent seeking" means in other replies including mine.
irishjohnnie··on The Case Against ISP Tolls
The difference is how Comcast interprets its competitive position compared to its peers. The barriers to entry in the last mile is high regardless of the ISP but it is willing to leverage/extract rents/push the boundaries more compared to others that may be building goodwill/not push the regulatory boundary/sitting and waiting.

In other words it is acting like a monopolist or a shrewd business.

irishjohnnie··on The Case Against ISP Tolls
I think maxhou is referring to the segment of the network from Comcast's (or any other ISP's) local data center to its box (I think they're called ATM switches) and eventually your house
irishjohnnie··on The Case Against ISP Tolls
I agree with you, but I'm betting that's not where the actual congestion is occurring (although there may be artificial rate limiting)
irishjohnnie··on The Case Against ISP Tolls
Their gross margins are the result of their positions in the value chain which, in turn, determine their cost structure. What Comcast is trying to do is to extract more rent out of its position.

As others have commented, consumers already pay for both services.

If it's infrastructure cost that you're concerned about I've read somewhere (Bloomberg?) that Netflix offered to co-locate its equipment in Comcast's data centers but the latter refused.

irishjohnnie··on With Farm Robotics, the Cows Decide When It’s Milking Time
Unfortunately, some of these productivity gains have been in the wrong direction from a sustainability and health standpoint.

One of the things that I'm looking at (as a hobby research topic) are automating managed intensive rotational grazing for cattle and remote herd management.

irishjohnnie··on When Life Gives You Lemons
It looks like the Lemon King went public first and Tesla PR is just counter attacking.
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