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Organização da memória em GPUs (NVIDIA/AMD)

Ramon Martins da Silva

Created on April 20, 2026

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PRESENTATION

Organização da memória em GPUs (NVIDIA/AMD)

Start
O que é uma GPU (Unidade de Processamento Gráfico)?

A GPU (Graphics Processing Unit) é um microprocessador especializado no processamento de gráficos, imagens e vídeos com alta eficiência. Sua arquitetura é projetada para realizar cálculos complexos de forma paralela, o que a torna ideal para lidar com grandes volumes de dados visuais. Função Principal O objetivo central da GPU é otimizar o desempenho do sistema, aliviando a carga de trabalho da CPU (Central Processing Unit). Ao assumir tarefas computacionalmente intensivas e repetitivas, a GPU permite que o processador principal se concentre na execução do sistema operacional e de outras aplicações de uso geral.

Diferenças entre CPU e GPU e suas Áreas de Atuação

Diferentemente da CPU, que realiza processamento sequencial de tarefas complexas, a GPU é projetada para processamento paralelo, com milhares de núcleos especializados operando simultaneamente. Isso permite que a GPU seja altamente eficiente em tarefas que demandam muita computação simultânea. Principais Áreas de Atuação

  • Entretenimento: Jogos digitais de alta fidelidade e renderização 3D em tempo real.
  • Produção Visual: Edição e pós-produção de vídeos em resoluções ultra-altas.
  • Inovação: Treinamento de modelos de Inteligência Artificial (IA) e Machine Learning.
  • Pesquisa: Simulações científicas complexas e análise de grandes volumes de dados.
Empresas como NVIDIA e AMD lideram o setor com tecnologias de ponta, impulsionando avanços em diversas áreas que dependem de alta capacidade de processamento paralelo.

Hierarquia de Memória

Hierarquia de Memória em GPUs A hierarquia de memória em GPUs é projetada para otimizar o desempenho, maximizando a largura de banda e minimizando a latência. Essa organização permite o processamento eficiente de grandes volumes de dados em paralelo. A estrutura varia dependendo da arquitetura e do fabricante, mas geralmente segue uma ordem do mais rápido ao mais lento:

  • Registradores: memória mais rápida, usada para operações instantâneas
  • Cache L1 / Memória Compartilhada: acessos rápidos para threads próximas
  • Cache L2: maior, mas um pouco mais lento, compartilhada por múltiplos núcleos
  • Memória Global (VRAM): memória de vídeo de alta largura de banda
  • Memória do Sistema (RAM): mais lenta, usada para armazenamento geral
Essa hierarquia é essencial para alcançar alto desempenho em operações paralelas em GPUs.

Registradores (Registers)

Principais características:

Como funcionam na prática:

  • Alocação Exclusiva: Cada thread possui seu próprio conjunto de registradores, permitindo execução rápida e isolada de tarefas.
  • Acesso de Ultra Velocidade: Registradores armazenam dados de uso frequente, eliminando a necessidade de acessar a VRAM, o que acelera o processamento.
  • Eficiência de Ciclo: Essas características possibilitam que a GPU realize cálculos complexos de forma eficiente, mantendo-se no núcleo de processamento e maximizando o desempenho. Essa arquitetura otimiza o processamento paralelo e melhora o throughput geral da GPU.
  • Os registradores na GPU são recursos limitados. Quando a demanda excede a capacidade, ocorre o transbordamento, aumentando a latência e degradando o desempenho, o que reduz a taxa de quadros (FPS) e aumenta o tempo de renderização. Gerenciar eficientemente esses recursos é essencial para otimizar o desempenho gráfico.
  • Os registradores representam o nível mais rápido de memória, localizados internamente em cada núcleo de processamento, permitindo acesso imediato aos dados.
  • Utilizados durante cálculos, eles eliminam a latência, ou seja, o tempo de espera para acessar informações.
  • Uma gestão eficiente dos registradores garante máximo desempenho, reduzindo a necessidade de buscar dados em memórias externas mais lentas.
  • Caso essa gestão seja inadequada, pode ocorrer um gargalo de performance, forçando a GPU a diminuir tarefas paralelas, o que impacta na fluidez de jogos e na velocidade de renderizações.

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Memória Compartilhada / Cache L1

Principais características:

Como funcionam na prática:

  • Memória de baixa latência localizada dentro do chip da GPU permite acesso extremamente rápido aos dados, reduzindo atrasos na execução de tarefas
  • A proximidade física, junto aos núcleos, elimina o tempo de deslocamento de dados, otimizando o desempenho
  • Em arquiteturas modernas, como NVIDIA e AMD, há uma gestão híbrida onde o espaço físico é único e configurado dinamicamente entre a memória L1 e a memória compartilhada, garantindo flexibilidade e eficiência
  • Na NVIDIA, essa memória reside nos SMs (Streaming Multiprocessors), enquanto na AMD ela está nas CUs (Compute Units), facilitando o acesso rápido e eficiente às informações necessárias para processamento
  • Sincronização permite que threads do mesmo bloco compartilhem resultados parciais em um espaço comum, como um 'quadro branco'. Isso garante que todas as threads estejam alinhadas durante o processamento.
  • Filtro de Dados atua como um seletor, retendo informações mais acessadas para evitar buscas na VRAM, que é mais lenta. Assim, melhora-se o desempenho ao otimizar acessos.
  • Reutilização é eficiente em tarefas onde um dado, lido uma única vez da VRAM, é utilizado por centenas de núcleos simultaneamente. Essa abordagem maximiza o uso dos recursos da GPU, aumentando a eficiência do processamento.

Desempenho:

  • Economia de Banda: Menor tráfego com a memória externa
  • Ganho de Escala: Aumenta a eficiência em tarefas paralelas massivas (IA, Jogos, Renderização)
  • Fluidez: Redução drástica da latência de acesso, garantindo tempos de execução menores

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  • Make sure your audience remembers the message.

Got an idea?

Let the communication flow!

With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.

  • Generate experiences with your content.
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  • Make sure your audience remembers the message.

Got an idea?

Let the communication flow!

With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.

  • Generate experiences with your content.
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  • Make sure your audience remembers the message.

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Let the communication flow!

With Genially templates, you can include visual resources to wow your audience. You can also highlight a particular sentence or piece of information so that it sticks in your audience’s minds, or even embed external content to surprise them: Whatever you like! Do you need more reasons to create dynamic content? No problem! 90% of the information we assimilate is received through sight and, what’s more, we retain 42% more information when the content moves.

  • Generate experiences with your content.
  • It’s got the Wow effect. Very Wow.
  • Make sure your audience remembers the message.