AI GPU Cost

AI GPU Service Cost Proof

This image outlines a framework for justifying the cost of AI GPU services (such as cloud or bare-metal leasing) by strictly proving performance quality. The core theme is “Transparency with Metrics,” demonstrating Stability and Efficiency through data rather than empty promises.

Here is a breakdown of the four key quadrants:

1. Clock Speed Consistency (Top Left)

  • Metric: Stable SM (Streaming Multiprocessor) Clock.
  • Meaning: This tracks the operating frequency of the GPU’s core compute units over time.
  • Significance: The graph should ideally be a flat line. Fluctuations indicate “clock jitter,” which leads to unpredictable training times and inconsistent performance. A stable clock proves the power delivery is clean and the workload is steady.

2. Zero Throttling Events (Top Right)

  • Metric: Count of ‘SW Power Cap’ and ‘Thermal Slowdown’ events.
  • Meaning: It verifies whether the GPU had to forcibly lower its performance (throttle) due to overheating or hitting power limits.
  • Significance: The goal is Zero (0). Any positive number means the infrastructure failed to support the GPU’s maximum potential, wasting the customer’s money and time.

3. Thermal Headroom (Bottom Left)

  • Metric: Temperature Margin (vs. $T_{limit}$).
    • (Note: The text box in the image incorrectly repeats “Streaming Multiprocessor Clock Changes,” likely a copy-paste error, but the gauge clearly indicates Temperature).
  • Meaning: It displays the gap between the current operating temperature and the GPU’s thermal limit.
  • Significance: Operating with a safe margin (headroom) prevents thermal throttling and ensures hardware longevity during long-running AI workloads.

4. Power Draw vs TDP (Bottom Right)

  • Metric: Max Power Utilization vs. Thermal Design Power (TDP).
    • (Note: The text box here also appears to be a copy-paste error from the top right, but the gauge represents Power/Watts).
  • Meaning: It measures how close the actual power consumption is to the GPU’s rated maximum (TDP).
  • Significance: If the power draw is consistently close to the TDP (e.g., 700W), it proves the GPU is being fully utilized. If it’s low despite a heavy workload, it suggests a bottleneck elsewhere (network, CPU, or power delivery issues).

Summary

  1. Objective: To validate service fees by providing transparent, data-driven proof of infrastructure quality.
  2. Key Metrics: Focuses on maintaining Stable Clocks, ensuring Zero Throttling, securing Thermal Headroom, and maximizing Power Utilization.
  3. Value: It acts as a technical SLA (Service Level Agreement), assuring users that the environment allows the GPUs to perform at 100% capacity without degradation.

#AIDataCenter #GPUOptimization #ServiceLevelAgreement #CloudInfrastructure #Nvidia #HighPerformanceComputing #DataCenterOps #GreenComputing #TechTransparency #AIInfrastructure

With Gemini

Large Scale Network Driven Design ( Deepseek V3)

Deepseek v3 Large-Scale Network Architecture Analysis

This image explains the Multi-Plane Fat-Tree network structure of Deepseek v3.

Core Architecture

1. 8-Plane Architecture

  • Consists of eight independent network channels (highways)
  • Maximizes network bandwidth and distributes traffic for enhanced scalability

2. Fat-Tree Topology

  • Two-layer switch structure:
    • Leaf SW (Leaf Switches): Directly connected to GPUs
    • Spine SW (Spine Switches): Interconnect leaf switches
  • Enables high-speed communication among all nodes (GPUs) while minimizing switch contention

3. GPU/IB NIC Pair

  • Each GPU is paired with a dedicated Network Interface Card (NIC)
  • Each pair is exclusively assigned to one of the eight planes to initiate communication

Communication Methods

NVLink

  • Ultra-high-speed connection between GPUs within the same node
  • Fast data transfer path used for intra-node communication

Cross-plane Traffic

  • Occurs when communication happens between different planes
  • Requires intra-node forwarding through another NIC, PCIe, or NVLink
  • Primary factor that increases latency

Network Optimization Process

The workflow below minimizes latency and prevents network congestion:

  1. Workload Analysis
  2. All to All (analyzing all-to-all communication patterns)
  3. Plane & Layer Set (plane and layer assignment)
  4. Profiling (Hot-path opt K) (hot-path optimization)
  5. Static Routing (Hybrid) (hybrid static routing approach)

Goal: Low latency & no jamming

Scalability

This design is a scale-out network for large-scale distributed training supporting 16,384+ GPUs. Each plane operates independently to maximize overall system throughput.


3-Line Summary

Deepseek v3 uses an 8-plane fat-tree network architecture that connects 16,384+ GPUs through independent communication channels, minimizing contention and maximizing bandwidth. The two-layer switch topology (Spine and Leaf) combined with dedicated GPU-NIC pairs enables efficient traffic distribution across planes. Cross-plane traffic management and hot-path optimization ensure low-latency, high-throughput communication for large-scale AI training.

#DeepseekV3 #FatTreeNetwork #MultiPlane #NetworkArchitecture #ScaleOut #DistributedTraining #AIInfrastructure #GPUCluster #HighPerformanceComputing #NVLink #DataCenterNetworking #LargeScaleAI

With Claude