Nov 13, 2022 · Fundamentals

Understanding JDK NIO File I/O and Linux Kernel Mechanisms: Buffered vs Direct IO, Page Cache, and Dirty Page Management

This article provides a comprehensive analysis of how JDK NIO performs file read and write operations by examining the underlying Linux kernel mechanisms, including the differences between Buffered and Direct IO, the structure and management of the page cache, file readahead algorithms, and the kernel parameters governing dirty page writeback.

Buffered IODirty Page WritebackJDK NIO

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Understanding JDK NIO File I/O and Linux Kernel Mechanisms: Buffered vs Direct IO, Page Cache, and Dirty Page Management

Programmer DD

Dec 15, 2018 · Databases

How I Built a High‑Performance Java KV Store for a Competition – Architecture and Optimizations

This article details the design, implementation, and performance tuning of a Java‑based key‑value storage engine built for a competition, covering the competition requirements, interface definitions, data layout, recovery logic, multi‑threaded read/write strategies, Direct I/O techniques, JVM tuning, and practical lessons learned.

KV StoreStorage Enginedirect-io

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How I Built a High‑Performance Java KV Store for a Competition – Architecture and Optimizations