☁️ Cloud & Databases

Imagens do WordPress Fazem o Buffer Doublewrite do MySQL Explodir: 85 ms de Espera no NVMe Expostos pelo Blktrace

85 milissegundos. É o que um NVMe gritando de rápido entregou pro MySQL num upload rotineiro de imagem. Blktrace destampou o pesadelo do buffer doublewrite.

Open Source Beat Apr 11, 2026 3 min read
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Saída do iostat mostrando pico de contenção no buffer doublewrite do MySQL no NVMe durante processamento de imagens no WordPress

⚡ Key Takeaways

  • Buffer pool lotado força flushes síncronos de páginas sujas, entupindo o buffer doublewrite 𝕏
  • NVMe compartilhado transforma writes assíncronas de imagens em travamentos no DB — isole os workloads 𝕏
  • Blktrace + iostat + status InnoDB = autópsia imbatível de I/O 𝕏
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#I/O contention #InnoDB #InnoDB doublewrite #InnoDB tuning #MySQL #MySQL InnoDB #MySQL performance #NVMe I/O #WordPress #WordPress optimization #blktrace #blktrace analysis #doublewrite buffer

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Originally reported by Dev.to

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