Reducing Memory Access Latency
Satoru Moriya <satoru.moriya.br@hitachi.com> Linux Technology Center Yokohama Research Lab. Hitachi, Ltd Copyright (c) 2013 Hitachi LTD., Systems Development Lab. All right reserved Reducing Memory Access Latency Copyright (c) 2013 Hitachi LTD., Systems Development Lab. All right reserved 2 Contents 1. Introduction 2. Issues 3. solution Copyright (c) 2013 Hitachi LTD., Systems Development Lab. All
Core algorithms deployed
Algorithms that are the main driver behind a system are, in my opinion, easier to find in non-algorithms courses for the same reason theorems with immediate applications are easier to find in applied mathematics rather than pure mathematics courses. It is rare for a practical problem to have the exact structure of the abstract problem in a lecture. To be argumentative, I see no reason why fashiona
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Queueing in the Linux Network Stack
[A slightly shorter and edited version of this article appeared in the July 2013 issue of Linux Journal. Thanks to Linux Journal’s great copyright policy I’m still allowed to post this on my site. Go here to subscribe to Linux Journal.] Packet queues are a core component of any network stack or device. They allow for asynchronous modules to communicate, increase performance and have the side affec
Understanding Memory
Our context for this discussion is the AICT Linux Cluster, which runs 64-bit GNU/Linux on AMD Opteron hardware. If you have a comment or question about the material presented, please send a note to research.support@ualberta.ca. Contents Introduction Programs and Processes Storage Class and Scope Program Size Memory Map Call Stack Page Table Libraries Memory Limits Memory Allocation Implementation
オペレーティングシステムのメモリ管理に関する演習
goto home page. 授業終了時はアンケート へ回答をお願いします. ここ数週間の授業内容の理解を深める(実感する)のが主な目的です. それが必要と思う人は前から順にやって行ってください. どれも簡単そうで仕方ないという人はいきなり 演習4と, その応用問題(だけ)をやっても良いです. はじめに オペレーティングシステムが提供している「仮想記憶」と呼ばれる メモリ管理方式について, 概念だけでなく実感として理解するために, 以下の簡単な演習を行う. 理解してほしい概念は以下のとおり. プログラムがOSに割り当ててもらうことができるメモリ(正確には, 「仮想メモリ」)の量は, 物理的に搭載しているメモリとは関係なく決まる. プログラムがOSに割り当ててもらっているメモリはページと呼ばれる 単位(通常4KB程度の連続したアドレスの集合)ごとに管理され, ある時点での一ページの状態は以
Optimising NginX, Node.JS and networking for heavy workloads
9 Min Read Optimising NginX, Node.JS and networking for heavy workloads Used in conjunction, NginX and Node.JS are the perfect partnership for high-throughput web applications. They’re both built using event-driven design principles and are able to scale to levels far beyond the classic C10K limitations afflicting standard web servers such as Apache. Out-of-the-box configuration will get you prett
What every programmer should know about memory, Part 1
What every programmer should know about memory, Part 1 [Editor's introduction: Ulrich Drepper recently approached us asking if we would be interested in publishing a lengthy document he had written on how memory and software interact. We did not have to look at the text for long to realize that it would be of interest to many LWN readers. Memory usage is often the determining factor in how softwar
InformIT: Linux Kernel Process Management > Process Descriptor and the Task Structure
This chapter looks at the famed operating system abstraction of the process. Topics covered include the generalities of the process, why it is important, and the relationship between processes and threads. Specifically, this chapter covers how Linux stores and represents processes. The process is one of the fundamental abstractions in Unix operating systems1. A process is a program (object code st
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GNU/Linux でのスレッドプログラミング NPTL (Native POSIX Thread Library) Programming. 以前から GNU/Linux でスレッドプログラミングをするための簡単なガイドを書きたいと思っていました。今更スレッドプログラミングについて書いても目新しいものになるとは思えないのですが、初めて NPTL (Native POSIX Thread Library) を使ったプログラムをするという方には、もしかしたら役に立つ情報かもしれません。はじめは怖々小さなプログラムを書いて動かしてみる。思ったより簡単なことに驚かれるでしょう。スレッドプログラミングと言っても難しいことはなにもありません。ライブラリが沢山仕事をしてくるおかげで快適に使うことができます。 本文中では glibc のバージョンによる違いについても触れます。参照したバージョンは gli
Data Center
Using Intel.com Search You can easily search the entire Intel.com site in several ways. Brand Name: Core i9 Document Number: 123456 Code Name: Emerald Rapids Special Operators: “Ice Lake”, Ice AND Lake, Ice OR Lake, Ice* Quick Links You can also try the quick links below to see results for most popular searches. Product Information Support Drivers & Software
Linux process states — Idea of the day
Recently I've been experimenting with Linux's ptrace(2) syscall. Unfortunately, there isn't any kind of "official" documentation for it and the manual page is quite poor. There are some other attempts to document it, for example in the strace sources or in several introductory tutorials online, but nothing explains how ptrace works from the ground up. Ptrace was always treated by kernel developers
Linux Profiling tools and techniques
Profiling is an alternative to benchmarking that is often more effective, as it gives you more fine grained measurements for the components of the system you're measuring, thus minimising external influences from consideration. It also gives the relative cost of various components, further discounting external influence. As a consequence of giving more fine grained information for a component, pro
Performance Tweaks and Tools For Linux | PDF | Transmission Control Protocol | Device Driver
The document provides tools and techniques for profiling and debugging Linux systems and Ruby applications. It discusses the lsof tool for listing open files, strace for tracing system calls, tcpdump for dumping network traffic, Google's perftools for profiling CPU usage, and a perftools.rb gem for profiling Ruby code. Examples are given for using these tools to analyze memory usage, thread schedu
The right way to deal with frozen processes on Unix
Those who administer production Unix systems have undoubtedly encountered the problem of frozen processes before. They just sit around, consuming CPU and/or memory indefinitely until you forcefully shut them down. Phusion Passenger 3 – our high-performance and advanced web application server – was not completely immune to this problem either. That is until today, because we have just implemented a
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What Linux Can Learn from Solaris Performance, and Vice-Versa | Triton DataCenter
A Few Things You Didn’t Know about Signals in Linux Part 1 at time to bleed by Joe Damato