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Fujitsu Previews Monaka: 144-Core Arm CPU Made with Chiplets

AleksandarK

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Fujitsu has previewed its next-generation Monaka processor, a 144-core powerhouse for data center. Satoshi Matsuoka of the RIKEN Center for Computational Science showcased the mechanical sample on social media platform X. The Monaka processor is developed in collaboration with Broadcom and employs an innovative 3.5D eXtreme Dimension System-in-Package architecture featuring four 36-core chiplets manufactured using TSMC's N2 process. These chiplets are stacked face-to-face with SRAM tiles through hybrid copper bonding, utilizing TSMC's N5 process for the cache layer. A distinguishing feature of the Monaka design is its approach to memory architecture. Rather than incorporating HBM, Fujitsu has opted for pure cache dies below compute logic in combination with DDR5 DRAM compatibility, potentially leveraging advanced modules like MR-DIMM and MCR-DIMM.

The processor's I/O die supports cutting-edge interfaces, including DDR5 memory, PCIe 6.0, and CXL 3.0 for seamless integration with modern data center infrastructure. Security in the design is taken care of with the implementation of Armv9-A's Confidential Computing Architecture for enhanced workload isolation. Fujitsu has set ambitious goals for the Monaka processor. The company aims to achieve twice the energy efficiency of current x86 processors by 2027 while maintaining air cooling capabilities. The processor aims to do AI and HPC with the Arm SVE 2 support, which enables vector lengths up to 2048 bits. Scheduled for release during Fujitsu's fiscal year 2027 (April 2026 to March 2027), the Monaka processor is shaping up as a competitor to AMD's EPYC and Intel's Xeon processors.



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That name almost sounds racist. :p
 
Too bad we don't see those Fujitsu CPUs in any cloud offering (as far as I'm aware) :(
 
Too bad we don't see those Fujitsu CPUs in any cloud offering (as far as I'm aware) :(

It looks like Fujitsu doesn't want to sell these processors outside of Japan.

If interested, ARM-based servers are available from Ampere Computing. Here is a set of useful 2-year-old records:


Arm Processors
Ampere Altra family 64-bit Arm-based CPUs
Ampere Altra 80-core
Ampere Altra Max 128-core

Developer Program
developer.amperecomputing.com
developer.amperecomputing.com/ampere-developer-program

Resourcces
developer.amperecomputing.com/resources
 
It looks like Fujitsu doesn't want to sell these processors outside of Japan.

If interested, ARM-based servers are available from Ampere Computing. Here is a set of useful 2-year-old records:


Arm Processors
Ampere Altra family 64-bit Arm-based CPUs
Ampere Altra 80-core
Ampere Altra Max 128-core

Developer Program
developer.amperecomputing.com
developer.amperecomputing.com/ampere-developer-program

Resourcces
developer.amperecomputing.com/resources
Yeah, I've used their offerings in both OCI and GCP.
It'd be nice to see more 3rd party ARM vendors available, other than Ampere and in-house solutions (like the ones from the big clouds).
 
I'm currently working on a government-owned machine with A64FX CPUs.
Porting codes to work with the Fujitsu compiler is challanging; there are GNU ones that works, but almost 50% slower in massive parallel performance, for the Fujitsu compiler has much better support on their own high speed interconnections.
 
I'm currently working on a government-owned machine with A64FX CPUs.
Porting codes to work with the Fujitsu compiler is challanging; there are GNU ones that works, but almost 50% slower in massive parallel performance, for the Fujitsu compiler has much better support on their own high speed interconnections.
Is their compiler totally proprietary, or is it yet another fork of clang/gcc?
 
The Fujitsu C/C++ compiler can work in two modes: traditional mode (for compatibility to older SPARC CPUs) and Clang mode via a switch "-Nclang".
 
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