Shift Left Is the Tip of the Iceberg

A lot of hopes and promises are riding on 18A being the savior for both Intel Foundry Services and the Intel chips wholesale. If we get official confirmation that it's been cancelled so Intel can focus on something else then it will signal the end of Intel as we know it.

Really? I thought they said using e-cores would be better than hyper threading. AMD has doubled down on hyper threading - putting a second decoder in each core that doesn't directly benefit single thread perf. So Intels 24 cores are now competitive with (actually losing to) 16 zen 5 cores. And that's without using AVX512 which Arrow Lake doesn't even support.

I was never a fan of big.little for desktop or even laptops.

(Wikipedia seems to want me to call it "heterogeneous computing", but that doesn't make sense - surely that term should mean running on CPU+GPU at the same time, or multiple different ISAs.)

Of course, it might've worked fine if they used symmetric CPU cores as well. Hard to tell.

I don’t know AMD well enough to say whether it works better for them.

There is one important application for which SMT is almost always beneficial: the compilation of a big software project, where hundreds or thousands of files are compiled concurrently. Depending on the CPU, the project building time without SMT is usually at least 20% greater than with SMT, for some CPUs even up to 30% greater.

For applications that spend much time in executing carefully optimized loops, SMT is usually detrimental. For instance, on a Zen 3 CPU running multithreaded GeekBench 6 with SMT disabled improves the benchmark results by a few percent.

The next 3 years, 2021/2022, 2022/2023 and 2023/2024, have been dominated by "10 nm" rebranded as "Intel 7" products, which have used the Golden Cove/Raptor Cove and Gracemont CPU core micro-architectures.

Now their recent products are split between those made internally with the Intel 4/Intel 3 CMOS processes (which use rather obsolete CPU cores, which are very similar to the cores made with Intel 7, except that the new manufacturing process provides more cores per package and a lower power consumption per core) and those made at TSMC with up-to-date CPU cores, where the latter include all the higher end models for laptop and desktop CPUs (the cheapest models for the year 2024/2025 remain some rebranded older CPU models based on refreshes of Meteor Lake, Raptor Lake and Alder Lake N).

Because it's an ARM trademrk, and that's how they want it written:

https://www.arm.com/company/policies/trademarks/arm-trademar...

> (Wikipedia seems to want me to call it "heterogeneous computing", but that doesn't make sense - surely that term should mean running on CPU+GPU at the same time, or multiple different ISAs.)

According to Wikipedia, it means running with different architectures, which doesn't necessarily mean instruction set architectures.

They do actually have different ISAs though. On both Apple Silicon and x86, some vector instructions are only available on the performance cores, so some tasks can only run on the performance cores. The issue is alluded to on Wikipedia:

*> In practice, a big.LITTLE system can be surprisingly inflexible. [...] Another is that the CPUs no longer have equivalent abilities, and matching the right software task to the right CPU becomes more difficult. Most of these problems are being solved by making the electronics and software more flexible.

No, there's no difference on Apple Silicon. You'll never need to know which kind of core you're running on. (Except of course that some of them are slower.)