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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.vms
Subject: Re: [OT] A64Fx was: ISO: The Eiffel OO programming language and IDE,
 on VMS
Date: Thu, 27 Mar 2025 21:12:54 -0000 (UTC)
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On Thu, 27 Mar 2025 11:34:16 +0200, Michael S wrote:

> On Wed, 26 Mar 2025 23:53:14 -0000 (UTC)
> Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
> 
>> On Wed, 26 Mar 2025 23:45:54 +0200, Michael S wrote:
>> 
>>> Top performing Arm CPUs are designed in USA.
>>> 1. Cupertino, California (Apple)
>>> 2. Raleigh, North Carolina (Qualcomm)
>>> 3. Austin, Texas (Arm Inc)
>> 
>> All outclassed by Fujitsu’s A64FX, as used in the Fugaku machine, and
>> successors -- designed in Japan.
> 
> That's very OT in comp.os.vms, but I'd write it anyway. A64FX did not
> outclass any of mentioned above.
> 
> A64FX is good chips for its intended applications, i.e. massively
> parallel supercomputers. Its most important feature is Tofu comm links
> that together with Tofu switches allow high-bandwidth communication
> between tens of thousands of nodes with the latency that is not exactly
> low, but can be called acceptable. It's second important feature is
> built-in connection to HBM2 memory. Its third important feature is
> rather good floating-point throughput when the application amenable to
> vectorizing. Its fourth important feature is that said good throughput
> is achieved without consuming too much power.

All of which adds up to greater performance than any of those other chips 
could manage. None of those others could offer hardware in the same 
league. That’s the point.

The Fugaku super was number one on the Top500 list for two years straight. 
And now, getting on to 5 years after its introduction, it still manages to 
stay in the top 10.

<https://top500.org/system/179807/>