はじめに

TwitterのTLに流れてきたこのtweet

🇩🇪 Atos is delighted to build & install its latest #BullSequanaXH3000 for @MaxPlanckpress, a leader in #science and #tech research.

The system will be powered by @AMD EPYC™ CPUs & the Instinct MI300A accelerator & strong energy efficiency with Atos' Direct Liquid Cooling 🌱
— Atos (@Atos) 2023年2月9日

AtosのBullSequana XH3000にAMD MI300を導入すると。

Atos BullSequana XH3000 とは？

2022年11月10日のPressでは、下記のような説明になっていた。

atos.net

Architecture leadership: AMD has a long history of X86 firsts and the innovation continues in the 4th Gen AMD EPYC processor. On top of its X86 5nm form factor advantages, AMD is introducing support for high-performant DDR5 DIMMs and fast PCIe® Gen 5 I/O, which enables the demands of today’s AI and ML applications and the increasing use of accelerators, GPUs, FPGAs, and more. For Atos, the future of HPC is hybrid computing!
Efficiency: Efficiency is the combination of high performance and low power consumption. The 4th Gen AMD EPYC™ processors, furthering the 3rd Gen AMD EPYC™, deliver impressive performance. Empowered by this new generation processor, BullSequana XH3000 will help our common customers to pay real dividends for our world.
Performance: with up to 96 cores and 6TB of memory or CPU, AMD EPYC™ 9004 series processors can provide outstanding results across a wide spectrum of industry-standard applications.
Security by Design: The exciting AMD EPYC processors helped enable innovative technology like Confidential Computing, and with a dedicated, fully integrated on-die security processor; the AMD EPYC 9004 series expands on the AMD Infinity Guard security feature set continuing to add layers for both physical and virtual security.

ここでは、MI300を導入するとは書いてありませんでした。

2023年2月9日のPressでは、下記のようになりました。

atos.net

The installation will feature 4th Gen AMD EPYC processors and for the first time in an Atos-based European system, the upcoming AMD Instinct MI300A accelerator. The system will consist of ten BullSequana XH3000 racks with a total of 768 processor nodes of and 192 accelerator nodes and will be complemented with an IBM SpectrumScale storage solution. The CPU nodes will be delivered in the third quarter of 2023, with full installation of the GPU nodes expected in the first half of 2024.
- 4th Gen AMD EPYC processors : 768 processor nodes : CPU nodes will be delivered in the third quarter of 2023
- AMD Instinct MI300A accelerator : 192 accelerator nodes : GPU nodes expected in the first half of 2024

accelerator nodes には、MI300A。え、MI300A って何？。MI300ベースの何か？なんでしょうね。。。

通常 GPU node にも CPU が居ますが、ここでは MI300A のみ。MI300では、CPUコアが24コアあるので、別途CPUが要らないわけね。。。

The Nextplatform が下記の記事で取り上げていました。

www.nextplatform.com

We have a hard time believing that there will not be a free-standing, four-GPU package in the MI300 series, for those customers who want a discrete CPU linked to a discrete GPU. The rumor has been that the MI300 would cram four GPU chiplets onto a single package, offering at least 2X more throughput than the MI250X at double precision floating point. But Wang did not talk about that in his GPU presentation. But he did talk about the CDNA 3 architecture and what we presume is the base for the Instinct MI300.

とあります。つまり、MI300の3つのGPU die を 4つのGPU die にしたものの要求があり、それを MI300A にしたのか？