This article analyzes why vLLM's PagedAttention can cause GPU memory fragmentation and out‑of‑memory errors in production, presents four typical OOM scenarios, and provides concrete diagnostics, configuration tweaks, code examples, and monitoring strategies to eliminate the problem.
The article dissects DeepSeek‑V4’s local deployment using vLLM, explaining the steep hardware requirements, the complex heterogeneous KV‑cache architecture, and the aggressive kernel‑fusion and multi‑stream optimizations that together make high‑context inference both memory‑intensive and engineering‑heavy.
This article explains full fine‑tuning—updating all parameters of a pretrained model—to achieve the highest task performance, compares it with LoRA and prompt tuning, shows when it is appropriate, provides a step‑by‑step Hugging Face implementation, memory‑saving tricks, common pitfalls, and practical takeaways.
This guide explains the five common sources of GPU memory consumption in large‑model inference services, provides a step‑by‑step diagnosis workflow—from static usage and KV‑Cache analysis to concurrency and K8s scheduling—offers concrete command‑line checks, scripts, configuration examples, and actionable remediation and monitoring recommendations.
The article dissects DeepSeek’s new Engram architecture, which separates computation from memory by using a large, cheap‑RAM‑based lookup table to store factual knowledge, allowing the transformer’s compute layers to focus on reasoning, dramatically reducing GPU memory demand while improving code, math, and long‑context performance.
This report analyzes the memory bottleneck of DeepSeek‑V3.2‑Exp’s sparse‑attention decoder, proposes the Expanded Sparse Server (ESS) to offload the latent cache to CPU memory, and demonstrates through high‑fidelity simulation that the approach dramatically improves decode throughput while keeping latency within acceptable limits.
This article breaks down the GPU memory requirements of large language models during training and inference, detailing the contributions of model weights, optimizer states, activations, KV cache, and activation recomputation, and provides concrete formulas, examples, and scaling insights for models like Qwen3 and DeepSeek V3.
The article explains how to estimate GPU memory and overall hardware requirements for fine-tuning and training large dense and MoE models, detailing calculations for full-parameter and LoRA approaches, scaling rules, and hidden costs relevant to interview assessments.
This article explains how to estimate the GPU memory required for running large language models of 3 B, 7 B, and 13 B parameters, walks through step‑by‑step calculations, shows how hardware limits affect feasibility, and offers practical optimization techniques such as quantization and CPU offloading.
This article breaks down GPU memory consumption for large Transformer models, explains how to estimate each component—parameters, optimizer state, activations, gradients—and shows how parallelism, mixed precision, and recomputation strategies can dramatically reduce the footprint.
This article demonstrates how to use ACK AI Profiling, built on eBPF and dynamic process injection, to perform non-intrusive, low‑overhead profiling of Kubernetes‑deployed large‑language‑model inference services, identify GPU memory growth causes, and apply optimization recommendations to prevent OOM issues.
After deploying the full‑precision DeepSeek‑R1 model on a 2×8‑GPU ACS cluster, repeated stress tests showed GPU memory usage continuously rising without release; this article details the investigation, reproduces the behavior, examines vLLM logs, Prometheus metrics, and reveals PyTorch’s caching allocator as the root cause, offering mitigation tips.
This article walks through a suite of PyTorch techniques—including automatic mixed precision, BF16, gradient checkpointing, gradient accumulation, tensor sharding, efficient data loading, in‑place ops, lightweight optimizers, memory profiling, TorchScript, and kernel fusion—that together can cut peak GPU memory usage by up to twenty‑fold while preserving model accuracy.
This article explains a simple formula for estimating the GPU VRAM required to serve large language models, demonstrates the calculation with a 7‑billion‑parameter example, clarifies why a 20% safety buffer is needed, and offers practical strategies such as quantization, CPU offload, and multi‑GPU parallelism to reduce memory usage.
The article investigates why Nvidia L40S and RTX A6000 GPUs show less memory via nvidia‑smi than their advertised 48 GB, revealing that enabled ECC memory reserves a few gigabytes, and demonstrates the effect by toggling ECC on a Tesla‑T4 card.
This article explains the technical differences between GDDR and HBM GPU memory, compares their bandwidth, cost, and use‑case scenarios, and helps engineers decide which memory type best fits their performance and efficiency requirements.
This article provides a comprehensive, step‑by‑step guide to training customized large language models, covering industry‑specific needs, data privacy, meticulous data cleaning, optimal data‑ratio balancing, token budgeting, GPU memory accounting, LoRA fine‑tuning techniques, and practical evaluation metrics for robust AI deployment.
This article explains how GPU memory is allocated during model fine‑tuning, describes collective communication primitives, and compares data parallel, model parallel, ZeRO, pipeline parallel, mixed‑precision, and checkpointing techniques for reducing memory consumption in large‑scale AI training.
This article explains how vLLM’s PagedAttention, inspired by operating‑system virtual‑memory paging, dynamically allocates KV‑cache memory to dramatically reduce GPU memory fragmentation, improve throughput, and handle scheduling, preemption, and distributed inference for large language models.
HiFT introduces a layer‑wise hierarchical fine‑tuning strategy that freezes most parameters per step, reduces optimizer state memory, and adapts mixed‑precision training, enabling 7B and 13B models to be fine‑tuned on 16‑31 GB GPUs while maintaining competitive performance.
This article explains the challenges of large‑model offline (batch) inference, such as GPU memory limits and distributed scheduling, and shows how Ray’s cloud‑native architecture, model partitioning, and Ray Datasets can be used to build efficient, elastic inference frameworks deployed with KubeRay.
This article introduces OneFlow Coop, a memory‑optimization technique that jointly optimizes dynamic‑graph recomputation strategies and GPU memory allocation by analyzing existing DTR limitations, proposing recomputable in‑place, op‑guided tensor allocation, and layout‑aware eviction modules, and demonstrating superior experimental results.
Android apps often get killed due to high memory usage, especially from GPU caches; this article explains the Android drawing system architecture, how bitmap rendering creates GPU memory leaks, and demonstrates using WindowManagerGlobal.startTrimMemory to clear those caches while outlining common pitfalls and best practices.
