Compute Nodes

Devana is a cluster of compute nodes named n[001-148]. The nodes are equiped with x86-64 architecture Intel processors. It is built using the Lenovo technology and contains four types of compute nodes:

Nodes	Moda / Cnt	Cores	Memory	Diskb	GPUs	Network
n[001-048]	U / 48	64	256 GB	3.84 TB	none	100 Gb/s
n[049-140]	U / 92	64	256 GB	1.92 TB	none	100 Gb/s
n[141-144]	A / 4	64	256 GB	3.84 TB	4x A100	200 Gb/s
n[145-148]	A / 4	64	256 GB	3.84 TB	4x A100	200 Gb/s

^a U - universal module, A - accelerated module.

^b The value represents raw local disk capacity. Node groups within the same module differ in local disk performance.

Universal module nodes

Fig.1:

Four ThinkSystem SD630 V2 servers installed in a DA240 enclosure

Fig.2:

Front view of the SD630 V2 unit

The universal module consists of 140 server units each representing a compute node. The compute node is Lenovo ThinkSystem SD630 V2 dense two-socket server in a 0.5U rack form factor. The solution consists of 35 2U ThinkSystem DA240 enclosures containing four front-access SD630 V2 servers. Each node incorporates two third-generation Intel Xeon Scalable processors (Ice Lake family). There are two groups of compute nodes that differ slightly in local storage performance.

The SD630 V2 is well suited for a variety of workloads ranging from cloud, analytics to AI and high performance computing application like molecular modeling, materials design, computer aided engineering or electronic design automation.

Fig.3:

Internal view of the SD630 V2 compute node

Universal compute node facts:

Feature	n[001-048]	n[049-140]
Processora	2x Intel Xeon Gold 6338 CPU @ 2.00 GHz		⁠
RAM	256 GB DDR4 RAM @ 3200 MHz		⁠
Diskb	3.84 TB NVMe SSD @ 5.8 GB/s , 362 kIOPs	1.92 TB NVMe SSD @ 2.3 GB/s, 166 kIOPs
Network	100Gb/s HDR Infiniband		⁠
Performancec	????? GFLOP/s per compute node		⁠

^a 2.00GHz base, 3.2GHz single core.

^b Performance data obtained with synthetic fio test. Bandwidth measured at mixed sequential read/write test (ratio 80/20 and 1M block). Operations count measured at mixed random read/write test (ratio 80/20 and 4k block).

^c DP.

Accelerated module nodes

Fig.4:

Front view of the SR670 V2 unit

The accelerated module consists of eight server units each representing an accelerated compute node. The accelerated compute node is Lenovo ThinkSystem SR670 V2 a versatile GPU-rich 3U rack server equipped with the NVIDIA HGX A100 4-GPU set. All GPGPUs are symmetricaly connected with NVLink (i.e. equal badwidth between arbitrary pair of GPU accelerators). The server contains the same number and type of CPUs as the universal compute node. There are two groups of accelerated compute nodes that differ slightly in local storage performance.

Accelerated compute nodes deliver most of the compute power usable for HPC as well as excellent performance in HPDA and AI workloads, especially in the learning phase of Deep Neural Networks.

Fig.5:

Internal view of the SR670 V2 accelerated compute node with 4x SXM GPUs and 8x 2.5-inch hot-swap drives cage

Fig.6:

Internal view of the SR670 V2 accelerated compute node with 4x SXM GPUs and 8x 2.5-inch hot-swap drives cage (cage and fans removed)

Accelerated compute node facts:

Feature	n[141-144]	n[145-148]
Processora	2x Intel Xeon Gold 6338 CPU @ 2.00 GHz		⁠
RAM	256 GB DDR4 RAM @ 3200 MHz		⁠
Diskb	3.84 TB NVMe SSD @ 5.8 GB/s , 362 kIOPs	3.84 TB NVMe SSD @ 2.3 GB/s, 166 kIOPs
GPGPU	4x Nvidia A100 SXM4, 40 GB HBM2		⁠
Network	200Gb/s HDR Infiniband		⁠
Performancec	????? GFLOP/s per accelerated compute node		⁠

^a 2.00GHz base, 3.2GHz single core.

^b Performance data obtained with synthetic fio test. Bandwidth measured at mixed sequential read/write test (ratio 80/20 and 1M block). Operations count measured at mixed random read/write test (ratio 80/20 and 4k block).

^c DP.

Processors

Intel® Xeon® Gold 6338

Intel® Xeon® Gold 6338 is a 64-bit 32-core x86 high-performance scalable server microprocessor that was designed to easily handle demanding workloads and complex tasks. The release date of the processor is Q2 2021 and is manufactured on with 10 nm technology. The base operation frequency is 2.00 GHz peaking at max turbo frequency 3.20 GHz. This microprocessor has 48 MB of L3 cache and supports up to 6 TB of DDR4-3200 memory (8 memory channels per CPU). Extended instruction set of the processor contains Intel® SSE4.2, Intel® AVX, Intel® AVX2, Intel® AVX-512. Its power consumption of 205W combines consistent performance even when subjected to heavy loads and reduction of operational costs.

Intel® Xeon® Gold 6338 facts:

Intel® Xeon® Gold 6338
Cores	32	Intel® UPI Speed	11.2 GT/s
Threads	64	Memory	6 TB @ DDR4-3200
Base Frequency	2.00 GHz	Process	10 nm
Max Turbo Frequency	3.20 GHZ	TDP	205 W

Accelerators

NVIDIA® A100

The NVIDIA® A100 Tensor Core GPU supports a broad range of math precisions, providing a single accelerator for multitude of workloads. A100 can efficiently scale up or be partitioned into seven isolated GPU instances, with Multi-Instance GPU (MIG) providing a unified platform that enables dynamical adjustment to shifting workload demands.

NVIDIA® A100 facts:

NVIDIA® A100
NVIDIA® Cuda Cores	6912	Single-Precision Performance	19.5 TFLOP/s
NVIDIA® Tensor Cores	432	Double-Precision Performance	9.7 TFLOP/s
GPU Memory	40 GB HBM2	Memory Bandwidth	1555 GB/sec
System Interconnect	NVIDIA® NVLink	Interconnect Bandwidth	600 GB/sec

Created by: Marek Štekláč