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#42 – kvm: the Linux Virtual Machine Monitor
KVM ãªã© Linux ã®ä»®æƒ³åŒ–技術ã«ã¤ã„ã¦æ£®ç”°ãŒè©±ã—ã¾ã™ã€‚感想ãªã©ã¯ãƒãƒƒã‚·ãƒ¥ã‚¿ã‚°Â #misreading ã‹Â [email protected] ã«ãŠå¯„ã›ãã ã•ã„。 Virtual Machines: Versatile Platforms for Systems and Processes (The Morgan Kaufmann Series in Computer Architecture and Design): Jim Smith, Ravi Nair: 9781558609105: Amazon.com: Books QEMU, a Fast and Portable Dynamic Translator Tiny Code Generator TCC : Tiny C Compiler Xen and the Art of Virtualization x86 v
LSB(Linux Standard Base)を見ãªãŒã‚‰initスクリプトを書ã„㟠- Qiita
ã„ã¤ã‚‚ãã‚Œã£ã½ãé©å½“ã«æ›¸ã„ã¦ã„ãŸinitスクリプト。 ã„ã„åŠ æ¸›ã¡ã‚ƒã‚“ã¨æ›¸ã„ã¦ã¿ã‚ˆã†ã¨æ€ã„ Linux Standard Base ã® VIII. System Initialization ã‚ãŸã‚Šã‚’見ãªãŒã‚‰æ›¸ã„ã¦ã¿ãŸã€‚ ã§ã‚‚Amazon Linuxã§ã—ã‹ç¢ºèªã—ã¦ã„ãªã„。 initスクリプト例 全体ã¯ã“ã‚“ãªæ„Ÿã˜ã€‚ 20.8. Init Script Functions ã¨ã„ã†ã®ã‚‚ã‚ã£ã¦ã€ã‚る程度ãã‚Œã«æ²¿ã£ã¦å®Ÿè£…ã•ã‚ŒãŸã®ãŒ /etc/init.d/functions ã‹ã¨æ€ã‚れるã®ã§ãれを使ã£ã¦ã„ã‚‹ #! /bin/sh ### BEGIN INIT INFO # Provides: myapp # Required-Start: $local_fs $network $remote_fs # Should-Start: $time # Required-Stop: $local_fs $ne
Linuxã®loadavgãŒç´„7時間ã”ã¨ã«ä¸Šæ˜‡ã™ã‚‹ç¾è±¡ã®åŽŸå› - Mackerel ãŠçŸ¥ã‚‰ã› #mackerelio
Mackerelãƒãƒ¼ãƒ ã®ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã®id:itchynyã§ã™ã€‚ 「mackerel-agentを入れるã¨loadavgãŒ7時間ã”ã¨ã«ä¸Šæ˜‡ã™ã‚‹ã€ 先日ã€ã“ã®ã‚ˆã†ãªå•ã„åˆã‚ã›ã‚’複数ã®ãŠå®¢ã•ã¾ã‹ã‚‰å—ã‘ã¾ã—ãŸã€‚ç§ã‚‚実験ã—ã¦ã¿ãŸã¨ã“ã‚ã€ç¢ºã‹ã«å†ç¾ã—ã¾ã—ãŸã€‚EC2 t2.microã«mackerel-agentを入れã¦ç°¡å˜ãªãƒã‚°ç›£è¦–ã¨ãƒ—ãƒã‚»ã‚¹ç›£è¦–ã‚’è¨å®šã—ã€æ•°æ—¥æ”¾ç½®ã—ã¾ã—ãŸã€‚ 確ã‹ã«ã€ç´„7時間ã”ã¨ã«loadavgãŒä¸Šæ˜‡ã—ã¦ã„ã¾ã™ã€‚ã“ã®å‘¨æœŸã®cronã®è¨å®šã¯ã—ã¦ãŠã‚‰ãšã€ã¾ãŸmackerel-agent内部ã§ã‚‚7時間ã”ã¨ã«è¡Œã†å‡¦ç†ã¯ã‚ã‚Šã¾ã›ã‚“。ã—ã‹ã—ã€ãƒ—ラグインを多ã入れるã»ã©loadavgã®ãƒ”ーク値も上ãŒã‚Šã¾ã™ã€‚ 本エントリーã§ã¯ã€ã“ã®ç¾è±¡ã®åŽŸå› ã«ã¤ã„ã¦èª¬æ˜Žã—ã¾ã™ã€‚ loadavgãŒä¸Šæ˜‡ã™ã‚‹åŽŸå› を調ã¹ã‚‹ã«ã¯ã€ã¾ãšloadavg自体ãŒã©ã†è¨ˆç®—ã•ã‚Œã¦ã„ã‚‹ã‹ã‚’知る必è¦ãŒã‚ã‚Šã¾ã™ã€‚ ã¾ãšã¯ã€LinuxãŒloada
readdir() nonatomicity (Theodore Ts'o)
Index Home About Blog Newsgroups: fa.linux.kernel From: "Theodore Ts'o" <tytso@mit.edu> Subject: Re: readdir loses renamed files Original-Message-ID: <[email protected]> Date: Mon, 25 Oct 2004 12:47:58 GMT Message-ID: <fa.e8bnc94.hmg120@ifi.uio.no> On Mon, Oct 25, 2004 at 04:21:57AM +0300, Timo Sirainen wrote: > I'd have thought this had already been asked many times before, but > go
ã‚るプãƒã‚»ã‚¹ãŒåˆ©ç”¨ã—ã¦ã„るメモリサイズを procfs 経由ã§èª¿ã¹ã‚‹ - naoyaã®ã¯ã¦ãªãƒ€ã‚¤ã‚¢ãƒªãƒ¼
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rsyncコマンドã®ä½¿ã„æ–¹: UNIX/Linuxã®éƒ¨å±‹
最終更新 2019-01-13 UNIX/Linux ã® rsync コマンドã¯ã€ãƒ•ã‚¡ã‚¤ãƒ«ãƒ»ãƒ‡ã‚£ãƒ¬ã‚¯ãƒˆãƒªã®ãƒãƒƒã‚¯ã‚¢ãƒƒãƒ—やミラーリング・åŒæœŸå‡¦ç†ã‚’è¡Œã†ã‚³ãƒžãƒ³ãƒ‰ã§ã‚る。リモートサーãƒã¸ã®åŒæœŸã‚‚å¯èƒ½ã§ã‚る。ã¾ãŸã€å·®åˆ†ã®ã‚るファイルã®ã¿ã‚’高速ã«ãƒŸãƒ©ãƒ¼ãƒªãƒ³ã‚°ã™ã‚‹ã“ã¨ãŒã§ãる。rsync ã¯ãƒ•ãƒªãƒ¼ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã§ã‚ã‚Šã€FreeBSD/Linux ãªã©ã»ã¨ã‚“ã©ã® UNIX ç³» OS ã§ãƒ‘ッケージãŒæº–å‚™ã•ã‚Œã¦ã„ã‚‹ãŸã‚ã€ç°¡å˜ã«åˆ©ç”¨å¯èƒ½ã§ã‚る。 ミラーリングãŒå¯èƒ½ (å˜ç´”㪠cp ã ã¨ã€å‰Šé™¤ã•ã‚ŒãŸãƒ•ã‚¡ã‚¤ãƒ«ãŒã‚³ãƒ”ー先ã«æ®‹ã£ã¦ã—ã¾ã†) リモートサーãƒã¸ã®è»¢é€ã‚„ã€ãƒªãƒ¢ãƒ¼ãƒˆã‚µãƒ¼ãƒã‹ã‚‰ã®è»¢é€ãŒå¯èƒ½ リモートサーãƒæŽ¥ç¶šã«ãŠã„㦠rsh ã‚„ ssh ã«å¯¾å¿œã—ã¦ã„ã‚‹ãŸã‚ã€æš—å·åŒ–ã—ãŸä¸Šã§ã®è»¢é€ãŒå¯èƒ½ 2回目以é™ã®å®Ÿè¡Œã§ã¯ã€å‰å›žå®Ÿè¡Œæ™‚ã¨ã®å·®åˆ†ã‚’調ã¹ã€å¿…è¦ãªãƒ•ã‚¡ã‚¤ãƒ«ã®ã¿è»¢é€ã™ã‚‹ãŸã‚高速ã§ã‚ã‚‹
Linux Performance
static, benchmarking, tuning: sar, perf-tools, bcc/BPF: bpftrace, BPF book: Images license: creative commons Attribution-ShareAlike 4.0. This page links to various Linux performance material I've created, including the tools maps on the right. These use a large font size to suit slide decks. You can also print them out for your office wall. They show: Linux observability tools, Linux static perfor
低レイヤーã®æ©ãæ–¹ - ã‚‹ãã™ã®æ—¥è¨˜ ~ Out_Of_Range ~
ã“ã®è¨˜äº‹ã¯ Kobe University Advent Calendar25日目ã®è¨˜äº‹ã§ã™ã€‚ 低レイヤー技術(後述)ã‚’ã“ã‚Œã‹ã‚‰å¦ã³ãŸã„人å‘ã‘ã®å…¥é–€è¨˜äº‹ã§ã™ã€‚ 自身ã®çµŒé¨“ã‚’è¸ã¾ãˆã€ã‚ˆã‚Šå¤šãã®äººé”ã«ã“ã®ãƒ¬ã‚¤ãƒ¤ãƒ¼ã«èˆˆå‘³ã‚’æŒã£ã¦ã»ã—ãã¦æ›¸ãã¾ã—ãŸã€‚ 決ã—ã¦å’è«–ãŒã‚„ã°ãã¦Advent calendarã®ãƒã‚¿ãŒä½œã‚Œãªã‹ã£ãŸã‚ã‘ã§ã¯(ry ãªãœã“ã‚“ãªè¨˜äº‹ã‚’書ã„ãŸã‹ ã„ã‚ゆるシステムプãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®ã‚ˆã†ãªä½Žãƒ¬ã‚¤ãƒ¤ãƒ¼(ã¨è¨€ã£ã¦å·®ã—支ãˆãªã„)ジャンルã£ã¦ä¸€ä½“何ã‹ã‚‰å§‹ã‚ã‚Œã°è‰¯ã„ã®ã‹ã„ã¾ã„ã¡ãƒ”ンã¨æ¥ãªã„ã—ã€ä½•ãŒé¢ç™½ã„ã®ã‹ã‚‚分ã‹ã‚‰ãªã„ã¨æ€ã‚ã‚Œã¦ã„る事ãŒå¤šã„ã¨æ€ã„ã¾ã™ã€‚ ã«ã‚‚ã‹ã‹ã‚らãšä½Žãƒ¬ã‚¤ãƒ¤ãƒ¼ã®é…力やå¦ã³æ–¹ã®æŒ‡é‡ã¿ãŸã„ãªç‰©ã‚’示ã—ãŸã€ã„ã‚ゆる入門記事ã£ã¦ã‹ãªã‚Šå°‘ãªã„ã‚“ã§ã™ã‚ˆã。 本記事ã¯ã“ã‚Œã‹ã‚‰ã‚·ã‚¹ãƒ†ãƒ プãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚’始ã‚ãŸã„方やã€æ—¢ã«ã‹ã˜ã£ã¦ã¿ãŸãŒä¸ã€…å…ˆãŒè¦‹ãˆã¦ã“ãªã„ã€å°†æ¥ä½•ã®å½¹ã«ç«‹ã¤ã®ã‹ä¸å®‰ã¨ã„ã†æ–¹é”ã«èªã‚“ã§ã„
Reddit - Dive into anything
How is GNU's yes so fast? $ yes | pv > /dev/null ... [10.2GiB/s] ... Compared to other Unices, GNU is outrageously fast. NetBSD's is 139MiB/s, FreeBSD, OpenBSD, DragonFlyBSD have very similar code as NetBSD and are probably identical, illumos's is 141MiB/s without an argument, 100MiB/s with. OS X just uses an old NetBSD version similar to OpenBSD's, MINIX uses NetBSD's, BusyBox's is 107MiB/s, Ultr
How to detect virtualization
Update: You may be interested in the perl module implementing these tricks. Frequently, our customers want to install our software in a virtual machine. This can be OK, but frequently they hit a CPU, memory, or IO limit caused by running in a constrained virtual environment. When this happens, we really like to know if they're running under virtualization when we try to support them. Here's some t
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æš´èµ°ã—ã¦ã©ã‚“ã©ã‚“メモリを食ã†ã‚¹ã‚¯ãƒªãƒ—ト㌠OS全体ã®ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡(CentOS5 ... カーãƒãƒ«ã¯2.6ç³»ã«ãªã‚‹)ã®å‹•ä½œã«ã©ã‚“ãªå½±éŸ¿ã‚’与ãˆã‚‹ã®ã‹ã€€ã£ã¦ã®ã‚’見るãŸã‚ã«ä»¥ä¸‹ã®ã‚ˆã†ãªãƒ†ã‚¹ãƒˆã‚’ã—ã¦ã¿ã¾ã—ãŸã€‚仕組ã¿ã¯ã ã„ãŸã„ç†è§£ã—ã¦ã‚‹ã‘ã©ã€ç´°ã‹ã„数値を追ã£ãŸã“ã¨ã¯ãªã‹ã£ãŸã®ã§ã‚„ã£ã¦ã¿ã¾ã—ãŸã€‚ sshã§ãƒã‚°ã‚¤ãƒ³ã—ã¦ã€topã‚’ç«‹ã¡ä¸Šã’る。プãƒã‚»ã‚¹ã‚’見張る用æ„ã‚’ã—ã¦ãŠã 別ã®sshã‚’ãŸã¡ã‚ã’ã¦ã€ Perlワンライナーã§ä»¥ä¸‹ã®ã‚ˆã†ãªãƒ—ãƒã‚»ã‚¹ã‚’走らã›ã‚‹(ã“ã®ãƒ—ãƒã‚»ã‚¹ã‚’topã§è¦‹å¼µã‚‹) # 1秒ã”ã¨ã«5MBå˜ä½ã§ãƒ¡ãƒ¢ãƒªã‚’食ã†ãƒ—ãƒã‚»ã‚¹ # 数値ã¯ãŠå¥½ã¿ã§ perl -e "while(1){ sleep 1; push @h , 1 x 1024 x 1024 x 5 } " ã¡ãªã¿ã«topã§è¦‹å¼µã‚‹ã¨ã㯠メモリ使用é‡ã§ã‚½ãƒ¼ãƒˆã•ã‚Œã‚‹ã‚ˆã†ã«ã—㦠topèµ·å‹•ä¸ã« shift + o を押ã—㦠n を押ã™ã¨ 実メモリ
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ãƒãƒ¼ãƒˆãƒ“ーツ最年長エンジニアã®æ»æ¾¤ã§ã™ã€‚以å‰ã€å¼Šç¤¾CTOã«ã‚·ãƒ‹ã‚¢ãŠã£ã•ã‚“エンジニアã‹ã‚‰è‹¥æ‰‹ã‚¨ãƒ³ã‚¸ãƒ‹ã‚¢ã«å‘ã‘ã¦ä½•ã‹æ›¸ã„ã¦ãã‚Œã¨è¨€ã‚ã‚ŒãŸæ°—ãŒã—ãŸã®ã§ã€ã‚¢ãƒˆãƒŸãƒƒã‚¯ï¼ˆatomic）ãªãƒ•ã‚¡ã‚¤ãƒ«æ“作ã«ã¤ã„ã¦3ç·¨ã«åˆ†ã‘ã¦ç´¹ä»‹ã—ã¾ã™ã€‚ã“ã®å†…容ã¯å¼Šç¤¾ã®ç¤¾å†…勉強会ã§è©±ã—ãŸå†…容をã¾ã¨ã‚ç›´ã—ãŸã‚‚ã®ã§ã™ã€‚ ãã®ãƒ•ã‚¡ã‚¤ãƒ«ã€å®‰å…¨ã«æ›´æ–°ã§ãã¦ã„ã¾ã™ã‹ï¼Ÿï¼ˆã‚¢ãƒˆãƒŸãƒƒã‚¯ãªãƒ•ã‚¡ã‚¤ãƒ«æ“作：å‰ç·¨ï¼‰â†ä»Šå›ž ãã®ãƒ•ã‚¡ã‚¤ãƒ«ã€å®‰å…¨ã«ä½œæˆã§ãã¦ã„ã¾ã™ã‹ï¼Ÿï¼ˆã‚¢ãƒˆãƒŸãƒƒã‚¯ãªãƒ•ã‚¡ã‚¤ãƒ«æ“作：ä¸ç·¨ï¼‰ ãã®ãƒ•ã‚¡ã‚¤ãƒ«ã€å®‰å…¨ã«ãƒãƒƒã‚¯ã§ãã¦ã„ã¾ã™ã‹ï¼Ÿï¼ˆã‚¢ãƒˆãƒŸãƒƒã‚¯ãªãƒ•ã‚¡ã‚¤ãƒ«æ“作：後編） 今回ã¯ã€Œã¿ãªã•ã‚“ã€å®‰å…¨ã«ãƒ•ã‚¡ã‚¤ãƒ«ã®æ›´æ–°ãŒã§ãã¦ã„ã¾ã™ã‹ï¼Ÿã€ã¨ã„ã†ã“ã¨ã«ã¤ã„ã¦ã€è€ƒãˆã¦ã¿ã¾ã—ょã†ã€‚ ã‚ãªãŸã¯ã‚るサーãƒä¸Šã®ãƒ•ã‚¡ã‚¤ãƒ«ã®æ›´æ–°ã‚’ä¾é ¼ã•ã‚Œã€ã‚‚らã£ãŸãƒ•ã‚¡ã‚¤ãƒ«ã‚’サーãƒä¸Šã§ã‚³ãƒ”ーã—ã¦ä¸Šæ›¸ãã—ã¾ã—ãŸã€‚ã—ã°ã‚‰ãã—ã¦ã€ãƒ‡ãƒ¼ã‚¿ã«ç•°å¸¸ãŒç™ºç”Ÿã—ãŸã®ã§èª¿ã¹ã¦æ¬²ã—ã„ã¨è¨€ã‚ã‚Œã¾ã—ãŸã€‚ã•ã¦ã€ä½•ãŒèµ·ã
Stop using tail -f (mostly)
Stop using tail -f (mostly) 12 Mar 2015 I still see a lot of people using tail -f to monitor files that are changing, mostly log files. If you are one of them, let me show you a better alternative: less +F The less documentation explains well what this +F is all about: Scroll forward, and keep trying to read when the end of file is reached. Normally this command would be used when already at the e
Linuxã«ãŠã‘るファイルã®ã‚¿ã‚¤ãƒ スタンプ (atime/ctime/mtime) - weblog of key_amb
Linuxã®ãƒ•ã‚¡ã‚¤ãƒ«ã«ã¯3ã¤ã®ã‚¿ã‚¤ãƒ スタンプãŒã‚る。 atime ... 最終アクセス日時 mtime ... 最終変更日時 ctime ... 最終ステータス変更日時 ** タイムスタンプã®è¡¨ç¤º |sh| ls -lu # atimeã®è¡¨ç¤º ls -l # mtimeã®è¡¨ç¤º ls -lc # ctimeã®è¡¨ç¤º ||< ã¾ãŸã¯ã€statコマンドã§ã‚‚表示ã§ãる。 || $ stat hoge.txt File: `hoge.txt' Size: 79 Blocks: 8 IO Block: 4096 通常ファイル Device: ca01h/51713d Inode: 139937 Links: 1 Access: (0664/-rw-rw-r--) Uid: ( 1001/ user) Gid: ( 1001/ user) Access: 2014-12-04 07:20:06.97995
よãã‚ã‹ã‚‹Linuxå¸¯åŸŸåˆ¶é™ | GREE Engineering
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A Heavily Commented Linux Kernel Source Code
ニンテンドウ64 - Speaker Deck
The Linux Documentation Project
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