The document discusses the basics of I/O and event-driven I/O models in Linux like blocking I/O, non-blocking I/O, I/O multiplexing using select/poll and their internals. It then introduces epoll as a more efficient alternative to select/poll and describes its user-space API, kernel structures and how it works by adding file descriptors to an epoll instance and waking up blocked processes on I/O e
Comparing the performance of atomic, spinlock and mutex I was curious in benchmark of different synchronization mechanisms: atomic, spinlock, mutex. Without synchronization #include <future> #include <iostream> volatile int value = 0; int loop(bool inc, int limit) { std::cout << "Started " << inc << " " << limit << std::endl; for (int i = 0; i < limit; ++i) { if (inc) { ++value; } else { --value;
Optimizing Linux Memory Management for Low-latency / High-throughput Databases Co-author: Cuong Tran Table of Contents Introduction Setting up the context Reproducing and understanding Linux's zone reclaim behavior NUMA memory rebalancing also triggers direct page scans Lessons learned Introduction GraphDB is the storage layer of LinkedIn's real-time distributed social graph service. Our service h
1) The document discusses the potential of 10/40 Gigabit Ethernet for web services. It provides benchmark results showing higher packet processing rates for 40GbE (4.5Mpps) compared to 10GbE (2.1Mpps). 2) Configuration details are given for building a test environment for measuring 10/40GbE performance using Intel x86 servers. There can be performance differences between network interface cards fr
[CentOS-announce] Software Collections for CentOS-6 (x86_64 only) Johnny Hughes johnny at centos.org Wed Feb 19 14:53:15 UTC 2014 Previous message: [CentOS-announce] CESA-2014:0186 Moderate CentOS 5 mysql55-mysql Update Next message: [CentOS-announce] CESA-2014:0173 Moderate mysql55-mysql SCL Security Update Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] The CentOS Project wants to
原則について優れたオブジェクト指向開発のための指針。ただ、、、原則は原則。必ず守らなければならないのではなく、まずそれで考えることが重要。逸脱したとしても正当な理由やトレードオフが説明できればよい。一覧単一責任の原則（SRP）オープン・クローズドの原則（OCP）リスコフの置換原則（LSP）依存関係逆転の原則（DIP）インターフェイス分離の原則（ISP）参考アジャイルソフトウェア開発の奥義 第2版 オブジェクト指向開発の神髄と匠の技作者: ロバート・C・マーチン, 瀬谷啓介出版社/メーカー: ソフトバンククリエイティブ発売日: 2008/07/01メディア: 大型本 Principles Of Object Oriented Designオブジェクト指向設計＠Syboos.jpオブジェクト指向設計の原則＠それはBooksオブジェクト指向設計原則＠ディノオープンラボラトリオブジェクト指向の法則
This document summarizes a talk about different server models using synchronous I/O (thread-per-connection) versus asynchronous I/O (NIO). The talk discusses the evolution of server designs from simple multithreaded models to NIO-based approaches. It presents arguments for both approaches but notes that benchmarks showed synchronous I/O to be faster than NIO in some cases, contradicting common bel
January 28, 2014 Writing Interactive Web Applications with Web Actors By Ron The actor model defined by Carl Hewitt and then evolved and popularized (well, relatively popularized) by the Erlang programming language, has become a very appropriate choice for designing certain kinds of software. Those groups of isolated processes communicating with one another by passing messages back and forth are a
A few weeks ago I posted a software developer’s reading list. An important criterion for this list was technology independence because most software development skills transcend whatever tools we are currently using. That being said, our choice of tools is quite important. This article explains why I currently build software using Java (and its platform). I also describe how I write Java: techniqu
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