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hiroyukim 2020/02/17
linux

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hiroyukim 2017/07/11
rust

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hiroyukim 2015/05/15
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hiroyukim 2014/11/06
jvm

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hiroyukim 2014/10/21
go

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hiroyukim 2014/09/11
Java

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hiroyukim 2014/08/21
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hiroyukim 2014/06/23
docker

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hiroyukim 2014/05/15
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hiroyukim 2014/02/17
erlang

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Summary ãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰ãŒãƒ–ãƒãƒƒã‚¯ãƒ‡ãƒã‚¤ã‚¹ã§ã¯ãªãã‚¹ãƒ¯ãƒƒãƒ—ã€‚ãƒ¡ãƒ¢ãƒªã«ä¹—ã‚‰ãªããªã£ãŸã‚‰ã€ã‚¹ãƒ¯ãƒƒãƒ—é ˜åŸŸã‚’ä½¿ã†ã€‚ ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®å®¹é‡ã¯æŒ‡å®šå¯èƒ½(ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã§ã¯ RAM ã®åŠåˆ†)ã€‚ã‚ã¨ã‹ã‚‰å¤‰æ›´ã™ã‚‹ã“ã¨ã‚‚å¯èƒ½ã€‚ å®¹é‡ã¯ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ä½œæˆæ™‚ã«äºˆã‚ç¢ºä¿ã•ã‚Œã‚‹ã‚ã‘ã§ã¯ãªãã€ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ä¸Šã®å®¹é‡ã«å¿œã˜ã¦ç¢ºä¿ã™ã‚‹ã€‚ ãƒªãƒ–ãƒ¼ãƒˆã™ã‚‹ã¨ã€ã™ã¹ã¦ã®ãƒ•ã‚¡ã‚¤ãƒ«ã¯å¤±ã‚ã‚Œã‚‹ Use Case ä¸»ãªç”¨é€” anonymous mmap ã¨ System V å…±æœ‰ãƒ¡ãƒ¢ãƒªã§ã¯ã‚«ãƒ¼ãƒãƒ«å†…ã§å¤–ã‹ã‚‰ã‚è¦‹ãˆãªã„å½¢ã§ tmpfs ã‚’åˆ©ç”¨ glibc ã® Posix å…±æœ‰ãƒ¡ãƒ¢ãƒª/ã‚»ãƒžãƒ•ã‚©ã§ã¯ /dev/shm ä»¥ä¸‹ã‚’åˆ©ç”¨ ãƒ‡ã‚£ã‚¹ã‚¯I/O ãŒå¤§é‡ã«ç™ºç”Ÿã™ã‚‹ã‚ˆã†ãªãƒ†ã‚¹ãƒˆã‚’é«˜é€ŸåŒ–ã™ã‚‹ãŸã‚ã«åˆ©ç”¨ ã‚ãƒ£ãƒƒã‚·ãƒ¥/ã‚»ãƒƒã‚·ãƒ§ãƒ³ãƒ•ã‚¡ã‚¤ãƒ«ã®å‡ºåŠ›å…ˆã¨ã—ã¦åˆ©ç”¨ tmpfs setup æ–°è¦ã« tmpfs ã‚’ãƒžã‚¦ãƒ³ãƒˆ # mkdir -pv /tmp/ne
hiroyukim 2014/01/24
kernel

ãƒ¡ãƒ¢ãƒª

linux
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ãƒ¡ãƒ¢ãƒªç©ºé–“ã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹æ–¹æ³•/dev/mem - ymkoã®æ—¥è¨˜
ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã‹ã‚‰ä»»æ„ã®ãƒ¡ãƒ¢ãƒªç©ºé–“ã‚’ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹ | çµ„ã¿è¾¼ã¿Linuxã®Armadilloã‚µã‚¤ãƒˆ www.lartmaker.nl/lartware/port/devmem2.c ï¼ˆ%Xã®ã¨ã“ã‚ã‚’%lXã«ã—ãªã„ã¨warningï¼‰ Translating ANSI C to Perl Chapter 8: Beyond Processes ãƒ‡ãƒã‚¤ã‚¹ãƒ‰ãƒ©ã‚¤ãƒã«é ¼ã‚‰ãªã„ãƒãƒ¼ãƒ‰ã‚¦ã‚§ã‚¢æ“ä½œ çŽ„ç®±Proã®PCI Expressã«è‡ªä½œæ‹¡å¼µæ©Ÿå™¨ã‚’ã¤ãªã: ãªã²ãŸãµJTAGæ—¥è¨˜ Linuxã§ã¯ã€/dev/memã¨ã„ã†ã‚¹ãƒšã‚·ãƒ£ãƒ«ãƒ•ã‚¡ã‚¤ãƒ«ã‚’çµŒç”±ã—ã¦ã€ãƒ¡ãƒ¢ãƒªç©ºé–“ã®ä»»æ„ã®ç‰©ç†ã‚¢ãƒ‰ãƒ¬ã‚¹ã«ã‚¢ã‚¯ã‚»ã‚¹ã§ãã‚‹ã‹ã‚‰ã§ã™ã€‚ ã“ã®æ–¹æ³•ã‚’ä½¿ã†ã«ã¯ã€ã¾ãšãƒ¡ãƒ¢ãƒªç©ºé–“ãŒã©ã“ã«å‰²ã‚Šå½“ã¦ã‚‰ã‚ŒãŸã‹ã‚’çŸ¥ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ãã®ãŸã‚ã«ã¯ã€ cat /proc/iomemã¨æ‰“ã¡ã¾ã™ã€‚ ã¨ã“ã‚ãŒã€Linuxã®ãƒ¡ãƒ¢ãƒªç©ºé–“ã¯ä»®æƒ³ãƒ¡ãƒ¢ãƒªç©ºé–“ãªã®ã§ã€*(un
hiroyukim 2014/01/16
ãƒ¡ãƒ¢ãƒª

Linux
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Perlã®å¤‰æ•°ã¯CoWã§å…±æœ‰ã•ã‚Œã¦ã‚‚ã„ãšã‚ŒCopyã•ã‚Œã‚‹ã¨ã„ã†è©± - heboi blog
https://gist.github.com/nihen/7085103 http://www.perlmonks.org/?node_id=905667 https://rt.perl.org/rt3//Public/Bug/Display.html?id=119937 http://d.hatena.ne.jp/kazuhooku/20100909/1284005880 å¤§ãã„ãƒžã‚¹ã‚¿ãƒ¼ãƒ‡ãƒ¼ã‚¿ãªã©ã‚’è¦ªãƒ—ãƒã‚»ã‚¹ã§èªã¿è¾¼ã‚“ã§ãŠã„ã¦ã€ãã®å¾Œforkã—ã€åãƒ—ãƒã‚»ã‚¹ã§CoWã§å…±æœ‰ã™ã‚‹ã€ãã‚“ãªå¹»æƒ³ã‚’æŠ±ã„ã¦ã„ãŸæ™‚æœŸãŒåƒ•ã«ã‚‚ã‚ã‚Šã¾ã—ãŸã€‚ Perlã®GCã®ãŸã‚ã®å‚ç…§ã‚«ã‚¦ãƒ³ã‚¿ã¯ã€å¤‰æ•°ã®å†…éƒ¨ã«ã‚«ã‚¦ãƒ³ã‚¿ãƒ¼ã‚’ã‚‚ã£ã¦ã„ã‚‹ãŸã‚ã€ãã®ã‚«ã‚¦ãƒ³ã‚¿ãƒ¼ã«å¢—æ¸›ãŒã‚ã‚‹ã¨CoWã§å…±æœ‰ã•ã‚Œã¦ã„ãŸãƒ¡ãƒ¢ãƒªã®ã†ã¡ã‚«ã‚¦ãƒ³ã‚¿ãƒ¼ã¨åŒä¸€ã®ãƒšãƒ¼ã‚¸å†…ã®ãƒ¡ãƒ¢ãƒªã¯æ–‡å—é€šã‚ŠCopyã•ã‚Œã‚‹ã€‚ é€šå¸¸ã®ã‚³ãƒ¼ãƒ‰å†…ã§ãã®ã“ã¨ã«æ°—ã‚’ã¤ã‘ãŸã¨ã—ã¦ã‚‚ã€åãƒ—ãƒã‚»ã‚¹ãŒæ»ã¬ã¨ã
hiroyukim 2013/10/22
perl

cow

ãƒ¡ãƒ¢ãƒª

ãƒ—ãƒã‚»ã‚¹
ãƒªãƒ³ã‚¯
Redisã‚’ä½¿ã†æ™‚ã¯è¦‹ç©ã®äºŒå€ã®å®¹é‡å¿…è¦ã ã‚ˆãã€ã¨ã„ã†è©± - Qiita
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hiroyukim 2013/08/09
redis

ãƒ¡ãƒ¢ãƒª
ãƒªãƒ³ã‚¯
CoW è¦ç‚¹ã¾ã¨ã‚
CoW ã¨ã¯ CoW = Copy-On-Write [ CoW - Wikipedia ] ãƒ—ãƒã‚»ã‚¹ã®ã‚³ãƒ”ãƒ¼ã‚’ä½œæˆ (fork) ã™ã‚‹ã¨ãã€æ›¸ãæ›ãˆã‚‹ã“ã¨ã®ãªã„ãƒ¡ãƒ¢ãƒªãƒšãƒ¼ã‚¸ã¯ã€ä¸¡æ–¹ã®ãƒ—ãƒã‚»ã‚¹ï¼ˆå…ƒã®ãƒ—ãƒã‚»ã‚¹ã¨ç”Ÿæˆã•ã‚ŒãŸãƒ—ãƒã‚»ã‚¹ï¼‰ã§å…±ç”¨ã—ã€æ›¸ãæ›ãˆã‚‹å¯èƒ½æ€§ã®ã‚ã‚‹ãƒ¡ãƒ¢ãƒªãƒšãƒ¼ã‚¸ã¯ã€æ–°ãŸãªãƒ¡ãƒ¢ãƒªãƒšãƒ¼ã‚¸ã‚’å‰²ã‚Šå½“ã¦ã¦ã‚³ãƒ”ãƒ¼ã‚’ä½œæˆã™ã‚‹ é‰„å‰‡ fork ã™ã‚‹ãƒ—ãƒã‚»ã‚¹ã‚’ç”Ÿæˆã™ã‚‹å ´åˆã€è¦ªåé–“ã§ãƒ¡ãƒ¢ãƒªå…±æœ‰ã—ãŸæ–¹ãŒè‰¯ã„ forkã™ã‚‹å‰ã«ç¢ºä¿ã—ãŸãƒ¡ãƒ¢ãƒªé ˜åŸŸã¯åãƒ—ãƒã‚»ã‚¹ã¨ã®é–“ã§å…±æœ‰ã•ã‚Œã‚‹ å…±æœ‰ã•ã‚ŒãŸãƒ¡ãƒ¢ãƒªé ˜åŸŸã«å¯¾ã—ã¦æ›¸ãè¾¼ã¿ã‚’è¡Œã†ã¨å…±æœ‰ã¯è§£é™¤ï¼ˆã‚³ãƒ”ãƒ¼ï¼‰ã•ã‚Œã‚‹ forkã—ãŸå¾Œã«ç¢ºä¿ã—ãŸãƒ¡ãƒ¢ãƒªé ˜åŸŸã¯åãƒ—ãƒã‚»ã‚¹ã”ã¨ã«ç¢ºä¿ã•ã‚Œã‚‹ï¼ˆå…±æœ‰ã•ã‚Œãªã„ï¼‰ ã©ã®ãƒ—ãƒã‚»ã‚¹ã§ã‚‚åŒã˜ã‚ˆã†ã«å‚ç…§ã™ã‚‹ã ã‘ã®(æ›¸ãæ›ãˆãªã„)ãƒ‡ãƒ¼ã‚¿ã¯ã€forkå‰ã«ç¢ºä¿ã—ã¦å…±æœ‰ã—ãŸæ–¹ãŒå…¨ä½“ã§ã®ãƒ¡ãƒ¢ãƒªä½¿ç”¨é‡ã‚’å°ã•ãä¿ã¦ã‚‹ã€‚ã¤ã¾ã‚Šã€fork æ•°ã‚’å¤šãã—ãŸã‚Šã§ãã‚‹ã€‚ãã—ã¦ã€
hiroyukim 2013/05/23
forkå…ˆã§ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚ãƒ£ãƒƒã‚·ãƒ¥ç‰ã‚’ä½¿ç”¨ã™ã‚‹ã¨CowçŽ‡ãŒä¸‹ãŒã£ã¦å€‹ã€…ã®workderã®ãƒ¡ãƒ¢ãƒªå æœ‰çŽ‡ãŒã‚ãŒã‚Šçµæžœã¨ã—ã¦workeræ•°ã‚’ä¸‹ã’ã‚‹å¿…è¦æ€§ãŒç”Ÿã˜ã‚‹ã‹ã‚‚ã€‚

fork

perl

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plack
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