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linuxã«é–¢ã™ã‚‹hide-Kã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (117)

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ç¬¬5å›žã€€Linux Kernelãƒ¡ãƒ¢ãƒªç®¡ç†æœ€æ–°å‹•å‘ï¼»ãã®1ï¼½ | gihyo.jp
2012å¹´6æœˆ6æ—¥ï½ž8æ—¥ã«LinuxCon Japan 2012ãŒé–‹å‚¬ã•ã‚Œã¾ã™ã€‚ã“ã“ã§ã¯Linux Kernelã®æœ€æ–°æŠ€è¡“ã®ç™ºè¡¨ã‚„è°è«–ãŒã„ã‚ã„ã‚è¡Œã‚ã‚Œã‚‹ã®ã§ã™ãŒã€ã‚«ãƒ³ãƒ•ã‚¡ãƒ¬ãƒ³ã‚¹ã‚’æ¥½ã—ã‚€æ‰‹åŠ©ã‘ã¨ãªã‚‹è¨˜äº‹ã‚’â€¦ã¨ã„ã†ã“ã¨ã§ã€æœ€è¿‘ã®Linux Kernelã®ãƒ¡ãƒ¢ãƒªç®¡ç†ã®ä»¥ä¸‹ã®ãƒˆãƒ”ãƒƒã‚¯ã«ã¤ã„ã¦ã€2å›žã«åˆ†ã‘ã¦ç´¹ä»‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ ä»Šå›žã¯ã€ NUMAå¯¾å¿œ çµ„è¾¼ã¿ã‚·ã‚¹ãƒ†ãƒ å‘ã‘ã®æ–°æ©Ÿèƒ½ æ¬¡å›žã¯ ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã€ãƒ‡ãƒã‚¤ã‚¹ã¨é€£æºã—ãŸã‚¨ãƒ³ãƒãƒ³ã‚¹ ãƒ¡ãƒ¢ãƒªè³‡æºç®¡ç†æ©Ÿèƒ½ï¼ˆcgroupï¼‰ CleanCache ã‚’å–ã‚Šä¸Šã’ã¾ã™ã€‚ ãã‚Œãžã‚Œã€LKMLã§ã©ã®ã‚ˆã†ãªææ¡ˆãŒã‚ã£ã¦ã€ææ¡ˆã®ç†ç”±ã¯ä½•ã‹ï¼Ÿ ç¾åœ¨ã¯ã©ã†ãªã£ã¦ã„ã‚‹ã®ã‹ï¼Ÿ ã¨ã„ã†ã“ã¨ã‚’ç°¡å˜ã«ç´¹ä»‹ã—ãŸã„ã¨æ€ã„ã¾ã™ã€‚ NUMAå¯¾å¿œ æ€§èƒ½ã‚¨ãƒ³ãƒãƒ³ã‚¹æ©Ÿèƒ½ã¨ã—ã¦ç¾åœ¨è°è«–ã•ã‚Œã¦ã„ã‚‹ã®ãŒã€NUMAãƒžã‚·ãƒ³ä¸Šã®ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã®ãƒãƒ¥ãƒ¼ãƒ‹ãƒ³ã‚°æ©Ÿèƒ½ã§ã™ã€‚ç¾åœ¨ã€å…¨ãåˆ¥ã®æ–¹å¼ãŒæœ‰åãƒãƒƒã‚«ãƒ¼2äººã‹ã‚‰
hide-K 2013/10/29
Linux ã«ãŠã‘ã‚‹ NUMA å¯¾å¿œ

linux
ãƒªãƒ³ã‚¯
MongoDBã‚’NUMAãªãƒžã‚·ãƒ³ã§ä½¿ã†ã¨ãã®æ³¨æ„ - é…’æ—¥è¨˜ ã¯ã¦ãªæ”¯åº—
ãƒ‡ãƒ¥ã‚¢ãƒ«CPUã§è¨ˆ12ã‚³ã‚¢24ã‚¹ãƒ¬ãƒƒãƒ‰ã€ãƒ¡ãƒ¢ãƒª48GBã¨ã„ã†ãƒžã‚·ãƒ³ã§ Mongo DB-2.0.8 ã‚’ã—ã°ã‚‰ãç¨¼åƒã•ã›ãŸã¨ã“ã‚ã€çªç„¶ CPU ã® system time ãŒ1ã‚³ã‚¢åˆ†æš´èµ°ã—ãŸã‚ˆã†ã«ãªã‚‹ã€ã¨ã„ã†ç¾è±¡ãŒèµ·ãã¾ã—ãŸã€‚ æœ€åˆã¯åŽŸå› ãŒã‚ˆãåˆ†ã‹ã‚‰ãšã€ã¨ã‚Šã‚ãˆãš mongod ã®ãƒ—ãƒã‚»ã‚¹ã‚’ kill ã—ã¦èµ·å‹•ã—ç›´ã—ãŸã‚‰å¾©æ—§ã—ãŸã®ã§ã™ãŒã€ã¾ãŸã—ã°ã‚‰ãã™ã‚‹ã¨åŒã˜ç¾è±¡ã«ã€‚ mongoã®ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ã¨ Load Average ã‚’ãƒ—ãƒãƒƒãƒˆã—ã¦ã¿ã‚‹ã¨ã€ã©ã†ã‚‚ã‚ã‚‹ç¨‹åº¦ (ç´„24GB?) ã®ãƒ¡ãƒ¢ãƒªã‚’ä½¿ã£ãŸã¨ã“ã‚ã§æš´èµ°ãŒèµ·ãã¦ã„ã‚‹ã‚ˆã†ãªâ€¦â€¦ã¨ãƒã‚°ã‚’è¦‹ç›´ã—ã¦ã¿ã‚‹ã¨ã€èµ·å‹•æ™‚ã« WARNING ãŒã§ã¦ã„ã¾ã—ãŸã€‚ Sun Jan 20 00:10:01 [initandlisten] Mongo DB starting : pid=12669 port=27017 dbpath=/var/lib/mongo 64-b
hide-K 2013/10/29
mongodb

linux
ãƒªãƒ³ã‚¯
å…±ç”¨ã‚µãƒ¼ãƒã«ãŠã‘ã‚‹Symlink Attacksã«ã‚ˆã‚‹æ”»æ’ƒã¨ãã®å¯¾ç–ã«ã¤ã„ã¦ - ã•ãã‚‰ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆå‰µæ¥æ—¥è¨˜
hide-K 2013/09/03
apache

linux
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cgroupsã«ã‚ˆã‚‹IOå¸¯åŸŸã®åˆ¶é™ - ã‚ã‚‚ã‚ã‚‚
Kernel 2.6.37ã§å°Žå…¥ã•ã‚ŒãŸè¡¨é¡Œã®æ©Ÿèƒ½ãŒã€RHEL6.1ã«ãƒãƒƒã‚¯ãƒãƒ¼ãƒˆã•ã‚Œã¦ã„ã¾ã™ã€‚éžå¸¸ã«åˆ†ã‹ã‚Šã‚„ã™ã„æ©Ÿèƒ½ã§ã™ã®ã§ã€å®Ÿé¨“çµæžœã‚’æ›¸ãæ®‹ã—ã¦ãŠãã¾ã™ã€‚ï¼ˆRHEL6.0ã«ã¯å…¥ã£ã¦ã„ã¾ã›ã‚“ã®ã§ã”æ³¨æ„ã‚’ã€‚ï¼‰ ãƒ‘ãƒ©ãƒ¡ãƒ¼ã‚¿ã®èª¬æ˜Ž ãƒ»blkio.throttle.read_bps_device ãƒ»blkio.throttle.write_bps_device ç‰¹å®šã®ãƒ‡ãƒã‚¤ã‚¹ã«å¯¾ã™ã‚‹ã‚¢ã‚¯ã‚»ã‚¹é€Ÿåº¦ã®ä¸Šé™ã‚’Byte/Secå˜ä½ã§æŒ‡å®šã€‚0ã‚’æŒ‡å®šã™ã‚‹ã¨åˆ¶é™ã‚’è§£é™¤ã€‚ æŒ‡å®šæ–¹æ³•ã¯"Major:Minor è¨å®šå€¤"ï¼ˆä¾‹"8:0 1048576"ï¼‰ ãƒ»blkio.throttle.read_iops_device ãƒ»blkio.throttle.write_iops_device ç‰¹å®šã®ãƒ‡ãƒã‚¤ã‚¹ã«å¯¾ã™ã‚‹ã‚¢ã‚¯ã‚»ã‚¹é€Ÿåº¦ã®ä¸Šé™ã‚’IO/Secå˜ä½ã§æŒ‡å®šã€‚0ã‚’æŒ‡å®šã™ã‚‹ã¨åˆ¶é™ã‚’è§£é™¤ã€‚ æŒ‡å®šæ–¹æ³•ã¯"Major:Minor è¨å®š
hide-K 2011/09/30
linux
ãƒªãƒ³ã‚¯
http://www.kernel.org/pub/linux/kernel/v3.0/ChangeLog-3.0
commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe Author: Linus Torvalds Date: Thu Jul 21 19:17:23 2011 -0700 Linux 3.0 commit 1f922d07704c501388a306c78536bca7432b3934 Merge: 2bafc7a 33d8881 Author: Linus Torvalds Date: Thu Jul 21 17:20:57 2011 -0700 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb * 'for_linus' of git://git.kernel.org/pub/scm/linux/
hide-K 2011/07/22
linux
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åå‰è§£æ±ºã®ã‚¿ã‚¤ãƒ ã‚¢ã‚¦ãƒˆè¨å®š - æ®ç™ºæ€§ã®ãƒ¡ãƒ¢ï¼’
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hide-K 2011/05/18
linux
ãƒªãƒ³ã‚¯
Linuxã§ã‚·ã‚¹ãƒ†ãƒ ã«å¯¾ã—ã¦æ„å›³çš„ã«é«˜è² è·ã‚’ã‹ã‘ãŸã„å ´åˆ - å…ƒRX-7ä¹—ã‚Šã®é©å½“ãªæ—¥ã€…
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hide-K 2010/05/17
stress ã‚³ãƒžãƒ³ãƒ‰

linux
ãƒªãƒ³ã‚¯
xfs stack overflow
Kazuho Oku @kazuho @kosaki55tea ã‚µãƒ¼ãƒç³»ã ã¨ã€ãƒ‡ã‚£ã‚¹ã‚¯ã«ãƒ‡ãƒ¼ã‚¿ã‚’ä¿å˜ã™ã‚‹ãŸãã„ã®ãƒ—ãƒã‚°ãƒ©ãƒ ã¯fsyncã—ã¾ãã‚‹ã—ã€ã‚ªãƒ³ãƒ¡ãƒ¢ãƒªã®ã‚„ã¤ã¯ swap ã«è½ã¡ã‚‹ã ã‘ãªã®ã§ã€ä¾‹å¤–ãƒ‘ã‚¹ã§ xfs ãŒå‘¼ã°ã‚Œã‚‹ã“ã¨ã¯ã€ã»ã¨ã‚“ã©ãªã„ã‚“ã˜ã‚ƒãªã„ã‹ãªãƒ¼ã¨ 2010-04-25 02:57:35
hide-K 2010/04/25
xfs

linux
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Linuxã§XFSãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚’åˆ©ç”¨ã™ã‚‹ãƒ’ãƒ³ãƒˆ
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hide-K 2010/04/25
ã€ŒXFSãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ãŒå£Šã‚ŒãŸã®ã¯,i386ãŒåŽŸå› ãªã®ã‹ã€kernel stackã‚’å¤§é‡ã«æ¶ˆè²»ã™ã‚‹XFSã§ã€åŒæ™‚ãƒ•ã‚¡ã‚¤ãƒ«ã‚¢ã‚¯ã‚»ã‚¹æ•°ãŒæ•°ç™¾ã‚’ã“ãˆã¦ã€ŒPANIC with "kernel stack overflow."ã€ãŒå¤šç™ºã—ãŸã®ãŒåŽŸå› ã‹ã€ã®ã„ãšã‚Œã‹ã ã¨ã¯æ€ã£ã¦ã„ã¾ã™ã€

linux

xfs
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é©å‘½ã®æ—¥ã€…ï¼ XFS on x86_64
XFS on x86_64ã¯ã¾ã£ãŸãå®Ÿç”¨çš„ã§ã¯ãªã„ã¨ã‹ãªã‚“ã¨ã‹ã„ã†è°è«–ã‚’LKMLã§ã—ã¦ã„ã‚‹ã€‚XFSã£ã¦ï¼‘ãƒšãƒ¼ã‚¸ æ›¸ãå‡ºã™ã ã‘ã§ã‚‚ã‚¹ã‚¿ãƒƒã‚¯3.5Kã‚‚ä½¿ã†ã®ã‚ˆãã€‚ã‚«ãƒ¼ãƒãƒ«ã‚¹ã‚¿ãƒƒã‚¯ã¯ãƒšãƒ¼ã‚¸ã‚µã‚¤ã‚ºx2ãªã®ã§8Kã—ã‹ãªã„ã€‚ ã‚ˆã£ã¦ ãªã‚“ã‹è‰²ã€…å‡¦ç† +- kmalloc +- ãƒ¡ãƒ¢ãƒªä¸è¶³ãªã®ã§å›žåŽ +- pageout +- writepage + kmalloc +- ã“ã®ã¸ã‚“ã§ã•ã‚‰ã«å‰²ã‚Šè¾¼ã¿ ã¨ã‹è€ƒãˆã‚‹ã¨ã‚ãã‚‰ã‹ã«çªãç ´ã£ã¦ã„ã¦ã€LVMã‚„MDã‚„NFSã‚’ä½¿ã†ã¨ãã‚“ãªè¤‡é›‘ãªãƒ‘ã‚¿ãƒ¼ãƒ³ã‚’ è€ƒãˆãªãã¦ã‚‚æ£å¸¸ç³»ã§æ™®é€šã«çªãç ´ã‚‹ã¨ã„ã†ã€‚David ChinnerãŒæ—¢çŸ¥ã®å•é¡Œã§ç›´ã›ãªã„ã¨ è¨€ã£ã¦ã„ã‚‹ã‹ã‚‰ã«ã¯ã€æœ¬å½“ã«ãƒ€ãƒ¡ãªã‚“ã ã‚ã†ã€‚ ä¸–é–“ã®äººãŒã©ã†ã‚„ã£ã¦å›žé¿ã—ã¦ã„ã‚‹ã®ã‹çŸ¥ã‚ŠãŸã„ã‚‚ã®ã§ã‚ã‚‹ã€‚
hide-K 2010/04/25
linux

xfs
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hide-K 2010/04/25
linux
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DELL PowerEdge + Linux ã§ CPU çœé›»åŠ› - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´
BIOS ã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆè¨å®šã¯ã€ŒActive Power Controllerã€ãªã®ã§ã€çœé›»åŠ›Onã€‚OS ã‹ã‚‰ã¯å¤‰æ›´ä¸å¯èƒ½ã€‚ã“ã®è¨å®šã‚’ã€ŒOS Controlã€ã«å¤‰æ›´ã™ã‚Œã°ã€cpufreq-set ã‚³ãƒžãƒ³ãƒ‰ã‚’ä½¿ã£ã¦ã€å‹•çš„ã« CPU ã‚¯ãƒãƒƒã‚¯ã‚’è¦³æ¸¬ï¼å¤‰æ›´ã§ãã‚‹ã‚ˆã†ã«ãªã‚‹ã€‚ Linux (Ubuntu 10.04) ã®ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆæˆ¦ç•¥ã¯ ondemandã€‚performance ã«å¤‰æ›´ã™ã‚Œã°æœ€é«˜é€Ÿã€‚powersave ã«å¤‰æ›´ã™ã‚Œã°æœ€ä½Žé€Ÿã€‚ # sudo cpufreq-info -g conservative ondemand userspace powersave performance # sudo cpufreq-info -c 0 -g performance # sudo cpufreq-info -c 1 -g powersave # sudo cpufreq-info cpufrequ
hide-K 2010/04/23
linux

server
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Release Notes
hide-K 2010/04/05
RHEL 5.5 release notes

linux

redhat
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hide-K 2010/03/25
TIME_WAITã®ãŠæŽƒé™¤

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hide-K 2010/03/11
linux
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ï¿½Linux/DB Tuning (DevSumi2010, Japanese)
1. é«˜æ€§èƒ½ãƒ»å®‰å®šé‹ç”¨ã®ãŸã‚ã® Linux/DB ã‚·ã‚¹ãƒ†ãƒ æ§‹ç¯‰ / é‹ç”¨æŠ€è¡“ æ¾ä¿¡ å˜‰ç¯„ (MATSUNOBU Yoshinori) ã‚µãƒ³ãƒ»ãƒžã‚¤ã‚¯ãƒã‚·ã‚¹ãƒ†ãƒ ã‚ºæ ªå¼ä¼šç¤¾ ãƒ—ãƒªãƒ³ã‚·ãƒ‘ãƒ« MySQL ã‚³ãƒ³ã‚µãƒ«ã‚¿ãƒ³ãƒˆ 2. ãƒ—ãƒãƒ•ã‚£ãƒ¼ãƒ« 2006 å¹´ 9 æœˆã‹ã‚‰ MySQL->Sun(-> ã‚ªãƒ©ã‚¯ãƒ« ) ã§ MySQL ã‚³ãƒ³ã‚µãƒ«ã‚¿ãƒ³ãƒˆã¨ã—ã¦å‹¤å‹™ ä¸»ãªè‘—æ›¸ Linux-DB ã‚·ã‚¹ãƒ†ãƒ æ§‹ç¯‰ / é‹ç”¨å…¥é–€ ç¾å ´ã§ä½¿ãˆã‚‹ MySQL Java ãƒ‡ãƒ¼ã‚¿ã‚¢ã‚¯ã‚»ã‚¹å®Ÿè·µè¬›åº§ Twitter: matsunobu Blog: http://opendatabaselife.blogspot.com * ä»Šå›žã®è³‡æ–™ã¯å…¬é–‹ã—ã¾ã™ * MySQL ç”¨èªžãŒã‚ã¡ã“ã¡ã«å‡ºã¾ã™ãŒã€ çµŒé¨“ã®ç„¡ã„æ–¹ã«ã‚‚åˆ†ã‹ã‚‹ã‚ˆã†ã«é…æ…®ã—ã¦ã„ãã¤ã‚‚ã‚Šã§ã™ 3. å®‰å®šç¨¼åƒã¨é«˜æ€§èƒ½ã‚’æ”¯ãˆã‚‹è¦ç´ ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³å±¤ã«é–¢ã™ã‚‹æŠ€è¡“ ãƒ†ãƒ¼ãƒ–ãƒ«è¨è¨ˆã€ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹è¨
hide-K 2010/02/19
mysql

linux

slide
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hide-K 2010/02/17
linux

kernel
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hide-K 2010/02/10
linux

kernel

network
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hide-K 2009/12/11
xen

linux
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hide-K 2009/12/01
kazuho

shibuya.pm

benchmark

linux

network
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