This article explains the key storage I/O characteristics—such as I/O size, read/write ratio, random versus sequential access, and workload patterns—across typical application types, providing reference values and guidance for storage simulation and performance testing using tools like Iometer.
This article explains the concepts of synchronous and asynchronous communication, blocking and non‑blocking thread behavior, and compares Java I/O models—including BIO, NIO, IO multiplexing, and AIO—highlighting their mechanisms, advantages, and typical use cases.
This article introduces the Linux sar command, explains its syntax and common options, and demonstrates how to sample and interpret CPU, memory, I/O, process queue, and swap metrics to identify system bottlenecks during performance testing.
The article compares Java's OIO, NIO, and AIO models, explaining how each handles threads, channels, and I/O requests, and clarifies the distinctions between synchronous, asynchronous, blocking, and non‑blocking communication, while discussing thread pooling, selector behavior, and performance implications for massive connections.
This article provides a comprehensive overview of the Linux sar command, explaining its syntax, common options, example use‑cases for CPU, memory, I/O and process monitoring, and how to interpret the output fields to identify system bottlenecks.
This article explains the differences between synchronous and asynchronous I/O, clarifies blocking versus non‑blocking calls, and describes various I/O models—including blocking, non‑blocking, multiplexed, event‑driven, and asynchronous—illustrated with diagrams to help readers understand how the kernel and user processes interact during I/O operations.
This article explains why the Linux I/O subsystem is the slowest part of the system, describes page‑level disk access, major and minor page faults, the file buffer cache, page types, write‑back mechanisms, monitoring tools, and practical tips for reducing I/O latency.
This guide explains how to enable MySQL’s Query Profiler, retrieve summary and detailed profiling data, and analyze CPU and I/O usage to pinpoint performance bottlenecks in your queries, including commands to list profiles, view specific query details, and interpret the results for optimization.
This article explains Guava’s terminology for streams, the ByteStreams and CharStreams utility methods, the deprecation of InputSupplier/OutputSupplier, and introduces the source and sink abstractions with their creation methods, common operations, and practical code examples for handling byte and character data in Java.
This article clarifies Unix I/O models by distinguishing synchronous and asynchronous operations, explaining blocking versus non‑blocking behavior, and summarizing the five classic I/O models with practical insights drawn from Richard Stevens' authoritative definitions.
