Activity v1

LLM Cost Latency and Reliability Simulator

Model request economics latency percentiles and fallback effects under disclosed assumptions.

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LLM Cost Latency and Reliability Simulator: Baseline

Explore the core controls with stable inputs and visible assumptions.

Assumptions

The simulation is deterministic and intentionally simplifies provider and hardware behavior.

Failure injection

Stable baseline with no injected production fault.

GPU VRAM & KV-Cache Memory Budget Estimator

Simulate model weights, KV-cache growth, PagedAttention block allocation, and GPU OOM thresholds.

⚠️ OOM WARNING
87.72 GB / 80 GB (100%)
Model & Infrastructure Configuration
Context Length16,384 tokens
Concurrency (Batch Size)16 requests
CUDA Out Of Memory (OOM) Threshold Exceeded!

The required VRAM (87.72 GB) exceeds the target cluster capacity (80 GB) by Math.abs(-7.72) GB. Apply INT8/FP4 quantization, reduce batch size, or upgrade GPU cluster topology.

VRAM Memory Breakdown (1x A100 (80GB))87.72 GB / 80 GB
16G
30.4G
39.32G
Model Weights (16 GB)
KV Cache (30.4 GB)
Activations (39.32 GB)
CUDA Buffer (2 GB)
Weights VRAM
16 GB
FP16 precision
KV Cache VRAM
30.4 GB
GQA attention
Concurrency
16 reqs
Batch size
VRAM Headroom
-7.72 GB
Available space
KV Cache Memory Sizing Formula
Memory_KV = 2 × Layers × Heads × HeadDim × Context × Batch × BytesPerElement

Multi-Head Latent Attention (MLA) reduces KV cache memory footprint by up to 93% by compressing Key-Value matrices into a single low-rank latent vector prior to attention matrix multiplication.

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Expected outcomes

  • Estimate unit economics
  • Balance targets and fallbacks

Connected concepts

Latency and ThroughputCost Latency and Reliability

Apply this lab in an architecture

AI Observability and Incident ResponseCost and Reliability EngineeringModel Serving Capacity Planning
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