[B! epoll] ttakezawaã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

ttakezawa id:ttakezawa

epollã«é–¢ã™ã‚‹ttakezawaã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (5)

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ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆã‚µãƒ¼ãƒã§ã®Pthreadã¨epollï¼ˆ1ï¼‰
æœ¬é€£è¼‰ã§ã¯ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã®ä¾‹ã‚‚æŽ²è¼‰ã—ã¦ã„ãäºˆå®šã§ã™ãŒã€æœ¬è¨˜äº‹ã§ã¯Linuxã«è¿½åŠ ã•ã‚ŒãŸepollã‚’æŽ¡ã‚Šã‚ã’ã€ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆã‚µãƒ¼ãƒã§ã®Pthreadåˆ©ç”¨ã¨æ¯”è¼ƒã—ã¦ã¿ã¾ã™ã€‚ ã¯ã˜ã‚ã« ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ãŒæ™®åŠã—ã€POSIX threadã‚‚åˆ¶å®šã•ã‚Œã€Pthreadã®åˆ©ç”¨ã¯ç›®æ–°ã—ã„ã‚‚ã®ã§ã¯ãªããªã‚Šã¾ã—ãŸãŒã€ã‚¹ãƒ¬ãƒƒãƒ‰ã«ã¾ã¤ã‚ã‚‹è¿·ä¿¡ã‚„èª¤ã£ãŸèªè˜ã‚’ã€ã ã„ã¶æ¸›ã£ãŸã¨ã¯ã„ãˆã€ä»Šã§ã‚‚ãŸã³ãŸã³è€³ã«ã—ã¾ã™ã€‚ä¾‹ã¨ã—ã¦ã€ ã‚¹ãƒ¬ãƒƒãƒ‰ã¯ãƒ—ãƒã‚»ã‚¹ã‚ˆã‚Šã‚‚è»½ã„ã®ã§ã€å¤šæ•°ä½œæˆã—ã¦ã‚‚è»½å¿«ã«å‹•ä½œã™ã‚‹ ã‚¹ãƒ¬ãƒƒãƒ‰ã¯ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚’ç°¡å˜ã«ã—ã¦ãã‚Œã€1ã¤ã®å‡¦ç†ã ã‘ã«é›†ä¸ã§ãã‚‹ ãªã©ãŒã‚ã‚Šã¾ã™ã€‚ã—ã‹ã—ã€ã“ã‚Œã‚‰ã¯å¸¸ã«çœŸã§ã‚ã‚‹ã¨ã¯é™ã‚Šã¾ã›ã‚“ã€‚æœ¬è¨˜äº‹ã§ã¯ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ã®æ¦‚å¿µã‚„å…¥é–€ã‚’ç¹°ã‚Šè¿”ã™ã®ã§ã¯ãªãã€ãã®åˆ©ç”¨æ–¹æ³•ã‚’HTTPã‚µãƒ¼ãƒã®ã‚µãƒ³ãƒ—ãƒ«å®Ÿè£…ã‚’åŸºã«è€ƒå¯Ÿã—ã¾ã™ã€‚æ›´ã«Linuxã«è¿½åŠ ã•ã‚ŒãŸç‹¬è‡ªæ©Ÿèƒ½ã®epollã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ã‚’ç”¨ã„
ttakezawa 2014/03/10
concurrent

thread

epoll

linux

server

network
ãƒªãƒ³ã‚¯
Epoll - from the kernel side
The document discusses the basics of I/O and event-driven I/O models in Linux like blocking I/O, non-blocking I/O, I/O multiplexing using select/poll and their internals. It then introduces epoll as a more efficient alternative to select/poll and describes its user-space API, kernel structures and how it works by adding file descriptors to an epoll instance and waking up blocked processes on I/O e
ttakezawa 2012/12/23
linux

kernel

epoll
ãƒªãƒ³ã‚¯
Kazuho@Cybozu Labs: ã€Œã‚µãƒ¼ãƒæ›¸ããªã‚‰ epoll ä½¿ã†ã¹ãã€ã¯ã€ä»Šã§ã‚‚æ£ã—ã„ã®ã‹
å¤šæ•°ã®TCPæŽ¥ç¶šã‚’ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°ã™ã‚‹ã‚µãƒ¼ãƒã‚’æ›¸ããªã‚‰ã€1ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³1ã‚¹ãƒ¬ãƒƒãƒ‰ã®ãƒ¢ãƒ‡ãƒ«ã§ã¯ãªãã€epollã‚„kqueueã®ã‚ˆã†ãªã‚¤ãƒ™ãƒ³ãƒˆé§†å‹•åž‹ã®I/Oå¤šé‡åŒ–ã‚’è¡Œã†ã¹ãã ã€ã¨è¨€ã‚ã‚Œã¾ã™ã€‚ã ãŒã€ãã®ã‚ˆã†ãªä¸»å¼µã¯ã€ã€ŒC10Kå•é¡Œã€ãŒæ›¸ã‹ã‚ŒãŸ2002å¹´ã‹ã‚‰7å¹´çµŒéŽã—ãŸä»Šã§ã‚‚æœ‰åŠ¹ãªã®ã§ã—ã‚‡ã†ã‹ï¼Ÿã€€echoã‚µãƒ¼ãƒã‚’æ›¸ã„ã¦ã€ãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯ã‚’å–ã£ã¦ã¿ã‚‹ã“ã¨ã«ã—ã¾ã—ãŸã€‚ ãµãŸã¤ã®ã‚°ãƒ©ãƒ•ã¯ã€ã„ãšã‚Œã‚‚æŽ¥ç¶šæ•°ã¨ã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã®é–¢ä¿‚ã‚’è¡¨ã—ã¦ã„ã¾ã™ã€‚æœ€åˆã®ã‚°ãƒ©ãƒ•ã¯ã€å…¨æŽ¥ç¶šãŒã‚¢ã‚¯ãƒ†ã‚£ãƒ–ã«é€šä¿¡ã—ãŸå ´åˆã€ã‚ã¨ã®ã‚°ãƒ©ãƒ•ã¯ã€å…¨æŽ¥ç¶šã®ã†ã¡å°æ•°ã®ã‚³ãƒã‚¯ã‚·ãƒ§ãƒ³ãŒé †æ¬¡ã‚¢ã‚¯ãƒ†ã‚£ãƒ–ã«ãªã£ã¦ã„ãã€ã¨ã„ã†ãƒ¢ãƒ‡ãƒ«ã§ã™ã€‚ã“ã‚Œã‚‰ã®ã‚°ãƒ©ãƒ•ã‹ã‚‰ã€ä»¥ä¸‹ã‚ˆã†ãªã“ã¨ãŒèªã¿å–ã‚Œã¾ã™ã€‚ epoll ã‚‚ per-thread ãƒ¢ãƒ‡ãƒ«ã‚‚ã€è‰¯ãã‚¹ã‚±ãƒ¼ãƒ«ã™ã‚‹ epoll ã¯ã€ãƒ¯ãƒ¼ã‚¯ã‚»ãƒƒãƒˆãŒå°ã•ã„å ´åˆã« (æœ€å¤§50%) per-thread ãƒ¢ãƒ‡ãƒ«ã‚ˆã‚Šã‚‚é«˜é€Ÿ å°‘ãªãã¨ã‚‚ã€1ã‚³ãƒ
ttakezawa 2009/09/27
linux

c10k

concurrent

epoll

server

performance
ãƒªãƒ³ã‚¯
éžåŒæœŸI/O Linux
éžåŒæœŸI/O æ¦‚èª¬ Introduction to Asynchronous I/O AIO, I/O Multiplexingâ€¦ 2007å¹´8æœˆ6æ—¥ KLab æ ªå¼ä¼šç¤¾ Kãƒ©ãƒœãƒ©ãƒˆãƒªãƒ¼ å»£ç€¬ æ£æ˜Ž Copyright Â© KLab Inc. All rights reserved. ä»Šæ—¥ã®ç›®çš„ éžåŒæœŸI/Oã¨ã¯ä½•ã‹ã‚’çŸ¥ã‚‹ éžåŒæœŸI/Oã‚’ä½¿ã†ã¨ä½•ãŒã†ã‚Œã—ã„ã®ã‹ã‚’çŸ¥ã‚‹ éžåŒæœŸI/Oã‚’å®Ÿç¾ã™ã‚‹æ‰‹æ®µï¼ˆè¤‡æ•°ï¼‰ã‚’çŸ¥ã‚‹ Copyright Â© KLab Inc. All rights reserved. ã‚¢ã‚¸ã‚§ãƒ³ãƒ€ éžåŒæœŸI/Oã‚’ä½¿ã†ç†ç”± éžåŒæœŸI/Oã¨ã¯ï¼Ÿ AIOã®å®Ÿè£…ã‚’ç´¹ä»‹ AIOã®ä½¿ã„æ–¹ è½ç©‚ã²ã‚ã„ Copyright Â© KLab Inc. All rights reserved. ã‚¢ã‚¸ã‚§ãƒ³ãƒ€ éžåŒæœŸI/Oã‚’ä½¿ã†ç†ç”± éžåŒæœŸI/Oã¨ã¯ï¼Ÿ AIOã®å®Ÿè£…ã‚’ç´¹ä»‹ AIOã®ä½¿ã„æ–¹ è½ç©‚ã²ã‚
ttakezawa 2009/06/10
linux

epoll

lighttpd

programming

server

performance
ãƒªãƒ³ã‚¯
mixi Engineersâ€™ Blog Â» Linux Programmingã€epollã®è©±
ãŠä¹…ã—ã¶ã‚Šã§ã™ã€åˆã‚ã¦ã®æ—¥æœ¬ã®å¤ã«åœ§å€’ã•ã‚Œã¦ã„ã‚‹ãƒˆãƒ¼ãƒ«ãƒžã‚¨ã‚µã‚«ã§ã™ã€‚ ä»Šæ—¥ã¯Linuxã«ãŠã‘ã‚‹ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°é–¢é€£ã®ãƒã‚¿ã§ã™ã€‚åˆ†æ•£ãƒ‡ãƒ¼ã‚¿ãƒ™ãƒ¼ã‚¹ã‚µãƒ¼ãƒã®é–‹ç™ºéŽç¨‹ã§æœ€è¿‘ã‚ˆãLinuxã®epollã¨ã„ã†ã‚¤ãƒ™ãƒ³ãƒˆãƒãƒ³ãƒ‰ãƒªãƒ³ã‚°æ©Ÿèƒ½ã‚’ä½¿ã£ã¦ã„ã¾ã™ã€‚ã“ã‚ŒãŒã¾ãŸå„ªç§€ãªæ©Ÿèƒ½ãªã®ã§ç´¹ä»‹ã—ã¾ã™ã€‚ ã“ã®Contextã§ã„ã†ã‚¤ãƒ™ãƒ³ãƒˆãƒãƒ³ãƒ‰ãƒ©ãƒ¼ã¯ã‚µãƒ¼ãƒãŒã‚¯ãƒ©ã‚¤ã‚¨ãƒ³ãƒˆã®ãƒªã‚¯ã‚¨ã‚¹ãƒˆã‚’å‡¦ç†ã™ã‚‹ãŸã‚ã®ãƒ¡ã‚«ãƒ‹ã‚ºãƒ ã§ã™ã€‚ã‚¤ãƒ™ãƒ³ãƒˆã®æ„ŸçŸ¥ã¨é€šçŸ¥ã¯å¤§é›‘æŠŠã«ã„ã†ã¨ä»¥ä¸‹ã®ä¸‰ã¤ã®å‡¦ç†ã§æ§‹æˆã•ã‚Œã¦ã„ã¾ã™ï¼š ä¸€ã¤ã‚‚ã—ãã¯è¤‡æ•°ã®ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã‚’ç›£è¦– ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã®æº–å‚™ãŒæ•´ã†ã¾ã§ãƒãƒå…¬ã®ã”ã¨ãã²ãŸã™ã‚‰å¾…ã¡ç¶šã‘ã‚‹ æº–å‚™ãŒæ•´ã£ãŸãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã®é€šçŸ¥ ã‚¢ãƒ—ãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã§ã®å®Ÿè£…ã¯ä¸€æ˜”ã¾ã§select(2)ã€ã‚‚ã—ãã¯poll(2)ã¨ã„ã†ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã§è¡Œã‚ã‚Œã¦ã„ã¾ã—ãŸã€‚äºŒã¤ã¨ã‚‚å½¹ç›®ã¯åŒã˜ã§ã™ãŒselect(2)ã®å ´åˆã€kernelã‚’ã„ã˜ã‚‰ãªã„é™ã‚Š
ttakezawa 2007/08/16
linux

epoll
ãƒªãƒ³ã‚¯
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