poikilotherm said:
mollwollfumble said:
Huh? Two threads per core. How do they manage that?

Just another example of how price is not necessarily a measure of performance. A twenty times difference in price for the same performance. And up the top end a twelve times difference.

> Jaysus, molly, multi threaded CPUs have been around for about 20 years.
re threads etc https://www.howtogeek.com/194756/cpu-basics-multiple-cpus-cores-and-hyper-threading-explained/
Those chips are vastly different for different applications, despite the pretty little pic showing they’re ‘the same’.
https://www.howtogeek.com/177790/why-you-cant-use-cpu-clock-speed-to-compare-computer-performance/
Oh, so that’s what’s meant by hyperthreading. An improvement by only a factor of 15 to 30% in speed, not two times.
I still don’t get it, though. What are the hardware/software details? All I see on the web are handwaving “this does something magical” sort of explanations.
It seems to imply that the CPU is not the rate-determining step. When I do real computations (ie. those that take more than 6 hours to complete), the CPU seems to me to be the rate-determining step. My computer programs don’t do “idle time”.
“In 2019 a set of vulnerabilities led to security experts recommending the disabling of hyper-threading on all devices.”
Oh dear.