Tag: infiniband

Network for GPUs

Posted on by lechuck park

with a Claude’s Help
The network architecture demonstrates 3 levels of connectivity technologies:

  1. NVLink (Single node Parallel processing)
  • Technology for directly connecting GPUs within a single node
  • Supports up to 256 GPU connections
  • Physical HBM (High Bandwidth Memory) sharing
  • Optimized for high-performance GPU parallel processing within individual servers
  1. NVSwitch
  • Switching technology that extends NVLink limitations
  • Provides logical HBM sharing
  • Key component for large-scale AI model operations
  • Enables complete mesh network configuration between GPU groups
  • Efficiently connects multiple GPU groups within One Box Server
  • Targets large AI model workloads
  1. InfiniBand
  • Network technology for server clustering
  • Supports RDMA (Remote Direct Memory Access)
  • Used for distributed computing and HPC (High Performance Computing) tasks
  • Implements hierarchical network topology
  • Enables large-scale cluster configuration across multiple servers
  • Focuses on distributed and HPC workloads

This 3-tier architecture provides scalability through:

  • GPU parallel processing within a single server (NVLink)
  • High-performance connectivity between GPU groups within a server (NVSwitch)
  • Cluster configuration between multiple servers (InfiniBand)

The architecture enables efficient handling of various workload scales, from small GPU tasks to large-scale distributed computing. It’s particularly effective for maximizing GPU resource utilization in large-scale AI model training and HPC workloads.

Key Benefits:

  • Hierarchical scaling from single node to multi-server clusters
  • Efficient memory sharing through both physical and logical HBM
  • Flexible topology options for different computing needs
  • Optimized for both AI and high-performance computing workloads
  • Comprehensive solution for GPU-based distributed computing

This structure provides a complete solution from single-server GPU operations to complex distributed computing environments, making it suitable for a wide range of high-performance computing needs.

Infiniband

Posted on by lechuck park

From claude with some prompting
The image correctly depicts the essential hardware elements of an InfiniBand network, including the PCI interface, Host Channel Adapters (HCAs), InfiniBand Switch, and InfiniBand cables connecting the HCAs to the switch.

It highlights RDMA (Remote Direct Memory Access) as a key technology that enables read/write operations without CPU involvement, facilitated by APIs for controlling the HCAs.

The hardware components listed (HCA, InfiniBand Switch, InfiniBand Cable) are accurate.

However, there is one potential inaccuracy in the details provided. The stated latency of 1.5μs seems quite low for an end-to-end InfiniBand communication. Typical InfiniBand latencies are in the range of a few microseconds, depending on the specific InfiniBand generation and configuration.

Additionally, while the image mentions a “400Gbps High Data Rate,” it’s important to note that this is an aggregate bandwidth across multiple links or ports, not necessarily the speed of a single link.

Overall, the image effectively conveys the main concepts and components of InfiniBand technology, with just a minor potential discrepancy in the stated latency value.