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Phytium to reveal 64-core ARMv8-A processor in August at Hot Chips
05.05.2021 [17:45],
Alexey Stepin

The United States government is known to have imposed an embargo on the supply of Xeon Phi accelerators to numerous Chinese supercomputer developers. Of course, this delays the work of local researchers. But it is possible that the PRC will soon not need HPC (High Performance Computing) processors from the outside, since Chinese companies are actively working to create chips that can replace Intel Xeon. Phytium, a development company based in Guangdong province, is currently working on a dedicated 64-core processor specifically designed for use in applications that require enormous computing power. The company is going to present its brainchild at the Hot Chips conference, which will be held in August.

This means that the chip is either ready for release, or its development is in the final stages. Very little is known about the new Phytium processor so far. The developer himself describes it as “a 64-core chip with ARMv8 architecture, designed for HPC”. ARMv8, of course, automatically means support for 64-bit computing. But the product is far from so simple, and it cannot be described in a nutshell. Apparently, this is a very complex chip containing a lot of the most advanced technologies. Modern ARM cores allow symmetric multiprocessing (SMP) for quad-core clusters. The number of clusters can be up to 12, they are combined using CoreLink CCN technology. The technologies AMBA 5 CHI, AMBA 4 ACE and others are also used.

In modern processors with the ARMv8-A architecture, the number of cores cannot exceed 48 if the developer uses ready-made ARM developments. Those who want more cores, such as a Cortex-A57 or A72, have to develop their own interconnect solutions, such as high-speed ring-bus. As a result, the developer of such a chip may face the need to rework SMP clusters and use special switches for each cluster or group of cores. Multi-core chips also require an advanced memory controller with the highest bandwidth.

More precisely, several multichannel controllers at once, and such systems are extremely difficult to develop. ARM offers fairly efficient DMC-520 controllers with support for ECC, security technologies and other capabilities demanded in the world of serious computing. Unfortunately, the current DMC-520 implementation supports a maximum of four DDR4 channels at 3200 MHz, which gives a peak bandwidth of the entire subsystem in the region of 102.4 GB / s, which may not be enough for a 64-core processor. It is possible to install more than four memory controllers, but this, again, requires additional work. Well-known developers of processors with ARMv8-A architecture, such as AMD or Cavium, do not go for it yet and use two- or four-channel memory subsystems for Opteron 1100A “Seattle” and ThunderX chips, respectively.

Apparently, Phytium managed to develop an advanced ring bus, a non-standard third-level cache subsystem, as well as a very advanced RAM subsystem for its brainchild. As already mentioned, while we do not know about the cores of which architecture we are talking about. Perhaps Phytium will use off-the-shelf designs such as the Cortex-A57, but it is possible that it has its own implementation of the ARMv8 architecture. If a company wants to compete with Xeon Phi or Tesla, it should be about 0.5-1 teraflops of computing power per processor, and with double precision computing (FP64). It is possible that the brainchild of Phytium will be slower due to architectural or thermoelectric limitations. Phytium is not the only Chinese developer working on the creation of chips for supercomputers, but the only one who is going to present their development at the Hot Chips conference. Since the event is about the latest technology, it is logical to assume that Phytium is going to show something special and very advanced.

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