September 2018 While researching archaic facts about the 80386 hardware context switch last weekend, I remembered that early versions of the Linux kernel relied on it. I was promptly sidetracked for hours reading code I hadn't seen in years. This weekend, I've decided to write down the journey to consolidate all the nuggets of fun stuff I discovered along the way. The exercise: Trace the context s
Deleted articles cannot be recovered. Draft of this article would be also deleted. Are you sure you want to delete this article? 長いので太字で要点 絞るためにGPU、仮想関係は省いてます。 NWが長くなったので分割 http://qiita.com/bringer1092/items/b6cd96a7f7db7121e8a7 I/Oが長くなったので分割 http://qiita.com/bringer1092/items/4a62ec6ab62b896ab611 ハードウェアサポート 4.6 USB 3.1 SuperSpeedPlus (10 Gbps) support USB3.1のサポート SuperSpeedPlus (10 Gbps)サポート 4.12
Linux Multi-Queue Block IO Queueing Mechanism (blk-mq) Details blk-mq (Multi-Queue Block IO Queueing Mechanism) is a new framework for the Linux block layer that was introduced with Linux Kernel 3.13, and which has become feature-complete with Kernel 3.16.[1] Blk-mq allows for over 15 million IOPS with high-performance flash devices (e.g. PCIe SSDs) on 8-socket servers, though even single and dual
$ cat /etc/os-release NAME="Ubuntu" VERSION="14.04.4 LTS, Trusty Tahr" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 14.04.4 LTS" VERSION_ID="14.04" HOME_URL="http://www.ubuntu.com/" SUPPORT_URL="http://help.ubuntu.com/" BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/" $ cat /proc/1/sched init (1, #threads: 1) ------------------------------------------------------------------- se.exec_start : 176
3. • B3 k6 z 2 l • mTCP +4Intel4DPDK wi • github mTCP+4DPDK orz • Key4Value4Store w k Linux l • RADIS → • d v orz • Memcached → • d 3 4. A G 7 LNPMXXT 4 0 0.2 0.4 0.6 0.8 1 0 20 40 60 80 100 Key size (bytes) Key size CDF by appearance USR APP ETC VAR SYS 0 0.2 0.4 0.6 0.8 1 1 10 100 1000 10000 100000 1e+06 Value size (bytes) Value Size CDF by appearance USR APP ETC VAR SYS 0 0.2 0.4 0.6 0.8 1 1 10
A customer reported an unusual problem with our CloudFlare CDN: our servers were responding to some HTTP requests slowly. Extremely slowly. 30 seconds slowly. This happened very rarely and wasn't easily reproducible. To make things worse all our usual monitoring hadn't caught the problem. At the application layer everything was fine: our NGINX servers were not reporting any long running requests.
はじめに 先日の下記の記事で「RHEL6ではバックポートされてMemAvailableが使えるよ」という情報を頂いたので、追加で情報を整理しました。 nopipi.hatenablog.com RHEL6.6へのMemAvailableのバックポート MemAvailableは、RHEL6.6でバックポートされてました。というのも、ググったらredhatのナレッジ情報が出てきました。 詳細はログインしないと見れないのですが、MemAvailableは"kernel-2.6.32-504.el6"以上で利用可能とあり、このバージョンがRHEL6.6のカーネルバージョンになります。 Backport "MemAvailable" field to /proc/meminfo in Red Hat Enterprise Linux 6. - Red Hat Customer Portal 使い方
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
Linux Advent Calendar 2014 こんにちは、hiraku_wfsです。 今年はLinux KernelのDocumentation/scheduler/sched-design-CFS.txtを和訳してみました。 過去には2009年頃にsyuu1228さんが機械翻訳ベースの和訳を試みています（sched-design-CFS.txtの和訳 - syuu1228's blog）が、今回v3.18-rc7のものを訳してみます。 ところどころ（ちょっとやりすぎかもしれない）意訳を入れています。 �場所によっては原文を見た方が分かりやすい箇所がいくつかあるので、原文と併記しています。 （やっぱり翻訳の専門家ではないので日本語でどう表現したものか悩んだりと結構大変でした...） 原著作者: Ingo Molnar ============= CFS Scheduler CFSス
This article has a followup. Linux has an elegant and beautiful design when it comes to threads: threads are nothing more than processes that share a virtual address space and file descriptor table. Threads spawned by a process are additional child processes of the main “thread’s” parent process. They’re manipulated through the same process management system calls, eliminating the need for a separ
In this series of blog posts, I will be taking notes about the internals and implementation details of the Linux event poll (epoll) subsystem. Prerequisites Please note that I am assuming the audiences of those articles are familiar with epoll APIs and usages. I will be focusing on the actual kernel implementation of the epoll subsystem, not it's usages. If you are not familiar with the usage of e
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You can find (just about) anything on Medium — apparently even a page that doesn’t exist. Maybe these stories will take you somewhere new?
Computer "scientist" Alex Clemmer is a computer programmer. Other programmers love Alex, excitedly describing him as "employed here" and "the boss's son". Alex is also a Hacker School alum. Surely they do not at all regret admitting him! personal site @hausdorff_space github.com/hausdorff RSS feed The performance of live site systems — everything from K/V stores to lock servers — is still measured
Recent posts: 04 Aug 2025 » When to Hire a Computer Performance Engineering Team (2025) part 1 of 2 22 May 2025 » 3 Years of Extremely Remote Work 01 May 2025 » Doom GPU Flame Graphs 29 Oct 2024 » AI Flame Graphs 22 Jul 2024 » No More Blue Fridays 24 Mar 2024 » Linux Crisis Tools 17 Mar 2024 » The Return of the Frame Pointers 10 Mar 2024 » eBPF Documentary 28 Apr 2023 » eBPF Observability Tools Ar
2016/12/27 更新 Googleなどの大手IT企業がうるう秒対策済のNTPサーバが公開したため、これを利用する内容などを以下にまとめました。 元旦に実施される うるう秒の対策 まとめ 2016/07/08 更新 2017/1/1に閏秒の実施が決定されました。対応はこの記事のとおりで問題なさそうです。 2015/06/24 情報追加(2015/06/29 更新) 下記の対応に関わるntpdの比較的新しいバージョンにSLEWモードで動作していても、うるう秒が挿入されるバグが発見されました。[redhat] これによりntp-4.2.8p3-RC1以降のバージョンでないとSLEWモードで動作していてもうるう秒が挿入されます。RedHatはntp-4.2.6p5-3.el6_6という対応済みのバージョンを提供しています。Ubuntuでは今日現在12.04LTS, 14.04LTSの２バージ
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