Server Side Public License (SSPL)
Server Side Public LicenseVERSION 1, OCTOBER 16, 2018 Copyright © 2018 MongoDB, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. TERMS AND CONDITIONS0. Definitions.“This License†refers to Server Side Public License. “Copyright†also means copyright-like laws that apply to other kinds of works, such as semiconductor masks.
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Linux環境ã«ãŠã„ã¦cpu数（core数）を数ãˆãŸã„ã¨ãã«grep processor /proc/cpuinfo | wc -lã¨ã‚„ã£ã¦ã‚‚良ã„ã‚“ã§ã™ã‘ã©ã€ã‚‚ã†ã¡ã‚‡ã£ã¨ã‚¹ãƒžãƒ¼ãƒˆãªã‚„ã‚Šæ–¹ã¯ç„¡ã„ã‹ãªï¼Ÿã¨æ€ã£ã¦ãŸã‚‰nproc(1)ãŒã‚ã£ãŸã®ã§ãã‚ŒãŒã©ã†ã‚„ã£ã¦æ•°ã‚’調ã¹ã¦ã„ã‚‹ã®ã‹ã‚½ãƒ¼ã‚¹ã‚’èªã‚“ã§ã¿ã¾ã—ãŸã€‚ ãã®å‰ã«nprocコマンドã®èª¬æ˜Žã‚’。nprocコマンドã¯åŸºæœ¬çš„ã«å¼•æ•°ç„¡ã—ã§å®Ÿè¡Œã™ã‚Œã°OKã§ã™ã€‚ masami@saga:~$ nproc 8 ã•ã¦ã€ã¾ãšã¯èªã‚€ã¹ãソースãŒã©ã®ãƒ‘ッケージã«ã‚ã‚‹ã®ã‹ã‚’調ã¹ãªã„ã¨ã„ã‘ãªã„ã®ã§ä»¥ä¸‹ã‚’実行ã—ã¦ã€ãƒ‘ッケージを調ã¹ã‚‹ã€‚ masami@saga:~$ yaourt -Qo `which nproc` /usr/bin/nproc is owned by coreutils 8.23-1 coreutilsã¯gitã§ç®¡ç†ã•ã‚Œã¦ã„ã¦ã€webã‹ã‚‰ã‚‚見れるã®ã§ãれを使ã„ã¾
NTPè¨å®š - ã¨ã‚ã‚‹SIerã®æ†‚鬱
環境 RHEL5 ( ntp-4.2.2p1 ) RHEL6 ( ntp-4.2.4p8 ) NTPã¯çµæ§‹å¾®å¦™ãªä¿®æ£ã‚’入れã¦ãã‚‹ã®ã§ãƒãƒ¼ã‚¸ãƒ§ãƒ³ãŒç•°ãªã‚‹å ´åˆã¯æ³¨æ„ãŒå¿…è¦ã€‚ manãŒå½“該ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã®æƒ…å ±æºã¨ã—ã¦ã¯ã¾ãšå„ªå…ˆã€‚ 最近ã®å¤‰æ›´ RHEL6ã§ã¯RHEL5㧠/etc/init.d/ntpd ã®ã¿ã§è¡Œã£ã¦ã„ãŸã“ã¨ã‚’ /etc/init.d/ntpdate 㨠/etc/init.d/ntpd ã«åˆ†é›¢ã—ã¦ã„る。 ntpdèµ·å‹•å‰ã®ntpdate実行ã«ã¤ã„ã¦åˆ†é›¢ã—ã¦ã„る。ntpdを使ã†ã®ã§ã‚ã‚Œã°ntpdateã‚‚åŒæ™‚ã«æœ‰åŠ¹ã«ã™ã‚‹ã¹ã(ntpdate実行をé¿ã‘ãŸã„å ´åˆä»¥å¤–)。 è¨è¨ˆ 何もよりも先㫠『å‚考ã€ã«ã‚ã’ãŸå¯Œå£«é€šã®ã€ŽLinuxユーザーズマニュアル RHEL6ç·¨ã€ãŒNTPã®èª¬æ˜Žã¨ã—ã¦è©³ã—ã„・ã‚ã‹ã‚Šã‚„ã™ã„。ã¾ãšã¯ã“れをèªã‚€ã€‚ NTPサーãƒã®éšŽå±¤è¨è¨ˆ NTPを使ã†ç›®çš„ã¯ã€Žæ£ã—ã„時刻ã®ç¶æŒã€ã¨ã€Žæ™‚刻
Linux ã§å…±æœ‰ãƒ¡ãƒ¢ãƒªã¯ãªãœ cached ã«è¨ˆä¸Šã•ã‚Œã‚‹ã®ã‹ï¼Ÿ - ablog
Linux ã§ç‰©ç†ãƒ¡ãƒ¢ãƒªã«å‰²ã‚Šå½“ã¦ã‚‰ã‚ŒãŸå…±æœ‰ãƒ¡ãƒ¢ãƒªã¯ cahced ã«è¨ˆä¸Šã•ã‚Œã‚‹ - ablog ã¨ã„ã†å‚™å¿˜éŒ²ã‚’先日書ã„ãŸãŒã€ Linux ã®å…±æœ‰ãƒ¡ãƒ¢ãƒªã«ã¯POSIX共有メモリã¨System V共有メモリãŒã‚ã‚Šã€ã©ã¡ã‚‰ã‚‚ tmpfs を使ã£ã¦ã„る。 tmpfs ã¯ãƒšãƒ¼ã‚¸ã‚ャッシュを使ã†ã‹ã‚‰ /proc/meminfo/cached ã«è¨ˆä¸Šã•ã‚Œã€å½“然 vmstat ã‚„ free ã§ã‚‚ cached ã«è¨ˆä¸Šã•ã‚Œã‚‹ã€‚ ã¨ã„ã†ã“ã¨ã®ã‚ˆã†ã 。 Tmpfs is a file system which keeps all files in virtual memory. Everything in tmpfs is temporary in the sense that no files will be created on your hard drive. If you unmount a tmpf
mmap(2) ã—ãŸãƒ•ã‚¡ã‚¤ãƒ«ã®ãƒšãƒ¼ã‚¸ã‚ャッシュ㮠reclaim - hibomaã®æ—¥è¨˜
hiboma.hatenadiary.jp sysctl vm.drop_caches=1 㯠mmap(2) ã—ã¦ã„るファイルã®ãƒšãƒ¼ã‚¸ã‚ãƒ£ãƒƒã‚·ãƒ¥ã‚’ç ´æ£„ã™ã‚‹ã“ã¨ã¯ã§ããªã‹ã£ãŸãŒã€ä»–ã«ã¯ã©ã†ã„ã†æ–¹æ³•ãŒã‚ã‚‹ã‚“ã ã£ã‘? ( 何ã‹å›°ã£ã¦ã„るケースãŒã‚ã‚‹ã‚ã‘ã§ãªãã¦æŒ™å‹•ã‚’確ã‹ã‚ãŸã„ã¨ã„ã†èˆˆå‘³ãƒ»é–¢å¿ƒã§èª¿ã¹ã¦ã„ã‚‹ ) memory pressure ã‚’ã‹ã‘ã‚‹ 1. 大ããªç„¡åページをもã¤ãƒ—ãƒã‚»ã‚¹ã‚’作る ホスト㮠RAM ã¨åŒç¨‹åº¦ã®ç„¡åページを使ã†ãƒ—ãƒã‚»ã‚¹ã‚’作れã°ã€ãƒšãƒ¼ã‚¸ã‚ャッシュを追ã„出ã›ã‚‹ ( reclaim ã•ã‚Œã‚‹ã¨æ›¸ã„ãŸæ–¹ãŒæ£ç¢ºã ã‚ã†ã‹ ) #include <stdlib.h> int main() { long size = 1L * 4 * 1024 * 1024 * 1024; char *p = malloc(size); for ( long i = 0; i < size; i +=
Control Groups Technical Overview
Red Hat Inc, 2011 Control Groups(cgroups) ã®æ¦‚è¦ ãƒ¬ãƒƒãƒ‰ãƒãƒƒãƒˆæ ªå¼ä¼šç¤¾ ã‚°ãƒãƒ¼ãƒãƒ«ã‚µãƒ¼ãƒ“ス本部 プラットフォームソリューショングループ ソリューションアーã‚テクト å¹³ åˆ htai[email protected] hbstudy#19 2 自己紹介  レッドãƒãƒƒãƒˆæ ªå¼ä¼šç¤¾ ã‚°ãƒãƒ¼ãƒãƒ«ã‚µãƒ¼ãƒ“ス本部 ソリューションアーã‚テクト  å¹³ åˆ ï¼ˆãŸã„ら ã¯ã˜ã‚）  レッドãƒãƒƒãƒˆæ ªå¼ä¼šç¤¾ã§ Linux ã®æ¨™æº–仮想化技術 Linux KVM ã®æ™®åŠã€å•“蒙活動㫠従事。最近ã§ã¯ã€ãƒ¬ãƒƒãƒ‰ãƒãƒƒãƒˆã®ã‚¯ãƒ©ã‚¦ãƒ‰ãƒ»ä»®æƒ³åŒ–ビジãƒã‚¹ã®ç«‹ã¡ä¸Šã’ã‚’è¡Œã£ã¦ã„ る。  The Fedora Project ã§æ—¥æœ¬èªžç¿»è¨³ãƒãƒ¼ãƒ ã«æ‰€å±žã€‚ Anaconda ã‚„ system-config- * 〠virt-manager 〠Rhythmbox 〠Brasero 〠Solang 〠P
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Don’t Let Linux Control Groups Run UncontrolledAddressing Memory-Related Performance Pitfalls of Cgroups Coauthors: Cuong Tran and Jerry Weng Summary The Linux kernel feature of cgroups (Control Groups) is being increasingly adopted for running applications in multi-tenanted environments. Many projects (e.g., Docker and CoreOS) rely on cgroups to limit resources such as CPU and memory. Ensuring th
hiboma/kernel/cgrulesengd.md at master · hiboma/hiboma
[other process] [ cgrulesengd ] | ^ | | * cgre_create_netlink_socket_process_msg ã§ä½œã£ãŸã‚½ã‚±ãƒƒãƒˆ | | * cgre_receive_netlink_msg, cgre_handle_msg ã§å—信パケットã®ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚° | | +---------------------+---------------------+ | fork | recvfrom | System Call Interface +---------------------+---------------------+ | | | | | | | | | | BSD Socket Interface | | | | | * AF_NETLINK | | | | | * NETLINK_CONNECTOR | | +----------
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1.æ¦‚è¦ Linux ã¯å‡¦ç†ãŒé›†ä¸ã—㟠CPU ã‹ã‚‰ç©ºã„ã¦ã„ã‚‹CPU ã«ãƒ—ãƒã‚»ã‚¹ã‚’マイグレーションã™ã‚‹ã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒ«æ©Ÿèƒ½ãŒå‚™ã‚ã£ã¦ã„る。ãã‚Œã«ã‚ˆã‚Šè¤‡æ•°ã®ãƒ—ãƒã‚»ã‚¹ãŒå‹•ä½œã—ã¦ã„ã‚‹ã¨ä»–ã®ãƒ—ãƒã‚»ã‚¹ã®å‡¦ç†ã«CPUãŒä½¿ç”¨ã•ã‚Œæ€§èƒ½ã«å½±éŸ¿ãŒå‡ºã‚‹ã“ã¨ãŒã‚る。 ã—ã‹ã—isolcpusオプションを使用ã™ã‚‹ã“ã¨ã§ã€kernelã®CPU割り当ã¦å¯èƒ½ãƒªã‚¹ãƒˆã‹ã‚‰é™¤å¤–ã™ã‚‹ã“ã¨ãŒå¯èƒ½ã¨ãªã‚‹ã€‚CPU割り当ã¦å¯èƒ½ãƒªã‚¹ãƒˆã‹ã‚‰é™¤å¤–ã—ãŸCPUã«å¯¾ã—ã¦ãƒ—ãƒã‚»ã‚¹ã‚’割り当ã¦ã‚‹ã“ã¨ã§ä»–ã®ãƒ—ãƒã‚»ã‚¹ã®å½±éŸ¿ã‚’å—ã‘ãšã«å‡¦ç†ã‚’è¡Œã†ã“ã¨ãŒã§ãる。 2.isolcpusè¨å®šæ‰‹é † æ‰‹é †1:grubファイルã®ä¿®æ£ ◆対象ファイル ・/etc/default/grub ◆修æ£å¯¾è±¡ã‚ー ・GRUB_CMDLINE_LINUX_DEFAULT â—†è¿½åŠ å†…å®¹ ・isolcpus=対象CPUã‚³ã‚¢ç•ªå· â€»è¤‡æ•°ã®å ´åˆã¯ã€Œ,ã€åŒºåˆ‡ã‚Šã€é€£ç•ªã®å ´åˆã¯ã€Œ-ã€ã§è¨˜è¼‰ ※記載例 以下ã¯C
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01 ≪ 12345678910111213141516171819202122232425262728≫ 03 ã¨ã‚ã‚‹ä¾é ¼ã§Linuxマシンã®æ€§èƒ½ç›£è¦–ã‚’è¡Œã†å¿…è¦ãŒã‚ã£ãŸã®ã§ã€sarã‚’ã„ã‚ã„ã‚使ã„ã¾ãã£ãŸã€‚ sarã¯ãƒ‡ã‚£ã‚¹ãƒˆãƒªãƒ“ューションã«ã‚ˆã£ã¦ã¯æ¨™æº–ã§å…¥ã‚Œã‚‰ã‚Œã¦ãªã„å ´åˆã‚‚ã‚ã‚‹ã®ã§ã€topã‚„vmstatã«æ¯”ã¹ãŸã‚‰ãªã‹ãªã‹çŸ¥ã‚‰ã‚Œã¦ãªã„ã¨ã¯æ€ã†ã‘ã©ã€éžå¸¸ã«ä¾¿åˆ©ãªã‚³ãƒžãƒ³ãƒ‰ã€‚ ã§ã€çŸ¥ã‚‰ã‚Œã¦ãªã„ã¤ã„ã§ã«ã€Linux JM Projectã«æ—¥æœ¬èªžmanページもå˜åœ¨ã—ãªã„。 ãªã®ã§ã€æ—¥æœ¬èªžã«è¨³ã—ã¦ã¿ãŸã€‚æ£å¼ã®JMプãƒã‚¸ã‚§ã‚¯ãƒˆã®ãƒžãƒ‹ãƒ¥ã‚¢ãƒ«ã¿ãŸã„ã«ãƒ¬ãƒ“ューを通ã—ã¦ãªã„ã®ã§ã€ç”¨èªžã‚„表ç¾ã®çµ±ä¸€ã‚‚ã—ã¦ãªã‘ã‚Œã°ã€è‡ªåˆ†ãŒå¾—æ„ãªåˆ†é‡Žä»¥å¤–ã®å˜èªžãŒè¨³ã¨ã—ã¦é©åˆ‡ã‹ã‚‚ã‚ã‹ã‚‰ãªã„ã‘ã©ã€è‡ªåˆ†ç”¨ã®è¨³ãŒä»–ã®äººã§ã‚‚多少ãªã‚Šã¨ã‚‚å‚考ã«ãªã‚Œã°ã¨ã„ã†æ„Ÿè¦šã€‚ ãŸã¶ã‚“BSDã€Linuxã€ãã®ä»–環境ã«ã‚ˆã£ã¦å¤šå°‘使ãˆã‚‹ã‚ªãƒ—ションãŒé•ã†ã‘ã©ã€ãŠãŠã¾ã‹ã«
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Update, 2018-08-24: For a more complete, formal discussion of consistency models, see jepsen.io. Network partitions are going to happen. Switches, NICs, host hardware, operating systems, disks, virtualization layers, and language runtimes, not to mention program semantics themselves, all conspire to delay, drop, duplicate, or reorder our messages. In an uncertain world, we want our software to mai
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