[B! aio] kamipoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

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aioã«é–¢ã™ã‚‹kamipoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (12)

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ãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ã¨AIOï¼ˆ4ï¼‰ - O'Reilly Japan Community Blog
å‰å›žã¯POSIX AIOã¨Linuxã‚«ãƒ¼ãƒãƒ«ã®AIOã‚µãƒãƒ¼ãƒˆã«ã¤ã„ã¦è§£èª¬ã—ã¾ã—ãŸã€‚ä»Šå›žã¯ã€ã“ã®AIOã®ä½¿ã„å‹æ‰‹ã‚’è‰¯ãã™ã‚‹ãŸã‚ã€POSIX AIOã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹æº–æ‹ ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’ä½œæˆã—ã¦ã„ã¾ã™ã€‚ Linuxãƒã‚¤ãƒ†ã‚£ãƒ–AIOãƒ©ã‚¤ãƒ–ãƒ©ãƒªlibl aioã®è©¦ä½œ Linux AIOã‚’ä½¿ç”¨ã™ã‚‹å ´åˆã€ç¾åœ¨ã§ã¯å‰è¿°ã®libaioã®åˆ©ç”¨ãŒç¬¬ä¸€å€™è£œã«ãªã‚Šã¾ã™ãŒã€ã‚„ã‚„ä½¿ã„å‹æ‰‹ãŒæ‚ªã„ãŸã‚ã€æœ¬è¨˜äº‹ã§POSIX AIOã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹æº–æ‹ ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’è©¦ä½œã—ã¦ã¿ã¾ã™ã€‚Linux AIOã§ã¯O_DIRECTãŒå‰æã¨ãªã‚‹ãŸã‚ã€ã“ã®ç‚¹ã‚‚ã‚„ã‚„ä½¿ã„å‹æ‰‹ãŒæ‚ªã„ã®ã§ã™ãŒã€SSDãªã©ãƒ¡ãƒ¢ãƒªãƒ™ãƒ¼ã‚¹ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã‚‚ã‚ã‚Šã¾ã™ã—ã€å‹•ä½œã¯éžåŒæœŸã«ãªã‚Šã¾ã›ã‚“ãŒio_submit(2)ã¯O_DIRECTãŒãªãã¨ã‚‚ä½¿ç”¨å¯èƒ½ã§ã™ã‹ã‚‰ã€ã¾ãè©¦ã—ã«ã‚„ã£ã¦ã¿ã¾ã—ã‚‡ã†ã€‚ ãƒ©ã‚¤ãƒ–ãƒ©ãƒªè¨è¨ˆè¦ç‚¹ã‚’æŒ™ã’ã¾ã™ã€‚ Linux AIOã«POSIX AIOã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ã‚’ã‹
kamipo 2011/05/19
linux

aio

programming
ãƒªãƒ³ã‚¯
ãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ã¨AIOï¼ˆ3ï¼‰ - O'Reilly Japan Community Blog
å‰å›žã¾ã§ãƒ•ã‚¡ã‚¤ãƒ« I/O å…¨èˆ¬ã«ã¤ã„ã¦ç°¡å˜ã«æŒ¯ã‚Šè¿”ã‚Šã¾ã—ãŸã€‚ã„ã‚ˆã„ã‚ˆæœ¬é¡Œã®AIOã«å–ã‚ŠæŽ›ã‹ã‚Šã¾ã™ã€‚ä»Šå›žã¯ã€POSIXã®AIOã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ã¨ã€Linuxã‚«ãƒ¼ãƒãƒ«ã®AIOã‚µãƒãƒ¼ãƒˆã«ã¤ã„ã¦ç´¹ä»‹ã—ã¾ã™ã€‚ POSIX AIO ã‚¤ãƒ³ã‚¿ãƒ•ã‚§ãƒ¼ã‚¹ ãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ã«ã‚ˆã‚Šç·©å’Œã•ã‚Œã‚‹ã¨ã¯ã„ãˆã€ãƒ•ã‚¡ã‚¤ãƒ« I/Oã®æœ€çµ‚åˆ°é”åœ°ç‚¹ã¯ãƒ‡ã‚£ã‚¹ã‚¯ã§ã™ã‹ã‚‰ã€åŒæœŸçš„ãªI/Oã¯ã‚„ã¯ã‚Šãã®æ™‚é–“ãŒå•é¡Œè¦–ã•ã‚Œã‚‹ã“ã¨ãŒã‚ã‚Šã¾ã™ã€‚ã¾ã ãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ã«å˜åœ¨ã—ãªã„ãƒ‡ãƒ¼ã‚¿ã‚’èªã¿å–ã‚‹å ´åˆã«ã¯é…ã„ãƒ‡ã‚£ã‚¹ã‚¯å¿…ãšå¾…ãŸãªã‘ã‚Œã°ãªã‚Šã¾ã›ã‚“ã€‚ã“ã®å‹•ä½œã‚’éžåŒæœŸã«è¡Œã„ã€å¾…ã£ã¦ã„ã‚‹é–“ã«ä»–ã®å‡¦ç†ã‚’é€²ã‚ã‚‰ã‚Œã‚‹ã‚ˆã†ã«ã™ã‚‹ã®ãŒéžåŒæœŸ I/Oã€AIOï¼ˆAsynchoronous I/Oï¼‰ã§ã™ã€‚POSIXã§ã¯aio_read(3)ã€aio_write(3)ã€aio_suspend(3)ã€aio_fsync(3)ã€aio_return(3)ã€aio_cancel(3)ã€
kamipo 2011/05/19
linux

aio

programming
ãƒªãƒ³ã‚¯
ãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ã¨AIOï¼ˆ1ï¼‰
ãƒ—ãƒã‚»ã‚¹ãŒãƒ–ãƒãƒƒã‚¯ã™ã‚‹è¦å› ã®ä¸€ã¤ã«ãƒ•ã‚¡ã‚¤ãƒ«I/OãŒã‚ã‚Šã¾ã™ã€‚ã“ã‚Œã‚’åŒæœŸI/Oã¨è¨€ã„ã¾ã™ãŒã€POSIXã§ã¯AIOï¼ˆéžåŒæœŸ I/Oã€Asynchronous I/Oï¼‰ã‚‚å®šç¾©ã—ã¦ãŠã‚Šã€I/Oä¸ã§ã‚‚ãƒ—ãƒã‚»ã‚¹ãŒãƒ–ãƒãƒƒã‚¯ã›ãšä»–ã®å‡¦ç†ã‚’é€²ã‚ã‚‰ã‚Œã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã™ã€‚ æœ¬è¨˜äº‹ã§ã¯ãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ã‹ã‚‰ãƒ•ã‚¡ã‚¤ãƒ« I/Oã‚’è§£èª¬ã—ã€Linuxã®io_submit(2)ã‚’ç”¨ã„ãŸPOSIXæº–æ‹ ã®AIOãƒ©ã‚¤ãƒ–ãƒ©ãƒªã‚’è©¦ä½œã—ã¦ã¿ã¾ã™ã€‚ ãƒ•ã‚¡ã‚¤ãƒ«I/Oã¨ãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ io_submit(2)ã§ã¯Direct I/Oã‚’ç”¨ã„ã¾ã™ãŒã€ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã®è©¦ä½œã¸é€²ã‚€å‰ã«ã¾ãšãƒ•ã‚¡ã‚¤ãƒ«I/Oã®ãƒãƒƒãƒ•ã‚¡ï¼ˆãƒãƒƒãƒ•ã‚¡ã‚ãƒ£ãƒƒã‚·ãƒ¥ï¼‰ã«ã¤ã„ã¦æ•´ç†ã—ã¾ã™ã€‚å®Ÿã¯å˜ã«ãƒãƒƒãƒ•ã‚¡ã¨è¨€ã£ã¦ã—ã¾ã†ã¨èª¤è§£ã•ã‚Œã‚‹å ´é¢ãŒå¤šãã‚ã‚Šã€ä¾‹ãˆã°ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°å…¥é–€ä¸€èˆ¬ã¨ã—ã¦ãƒ•ã‚¡ã‚¤ãƒ«I/Oã‚’å–ã‚Šä¸Šã’ã‚‹éš›ã«ã¯ã€ CPUã®å‹•ä½œã¯é€Ÿã„ã€‚ãƒ‡ã‚£ã‚¹ã‚¯ã®å‹•ä½œã¯é…ã„ã€‚ ä¸¡è€…ã®é–“ã«é€Ÿåº¦å·®ã‚’ç·©å’Œã™ã‚‹ç·©è¡
kamipo 2010/11/23
linux

aio

programming
ãƒªãƒ³ã‚¯
ã©ã†ã‚„ã£ã¦I/Oã®å®Œäº†ã‚’ã†ã‘ã¨ã£ã¦ã„ã‚‹ã‹ï¼ˆæº–å‚™ç·¨ï¼‰ - takkan_mã®No planãªæ—¥å¸¸
ã ã‚“ã ã‚“ã€ã ã‚Œã¦ãã¾ã—ãŸãŒã€ä»Šåº¦ã¯ã©ã®ã‚ˆã†ã«io_submit()ã§ç™ºè¡Œã—ãŸI/OãŒå®Œäº†ã—ãŸã‹ã€ã©ã†ã‹ã‚’çŸ¥ã‚‹ãŸã‚ã®ä»•çµ„ã¿ã‚’è¿½ã£ã‹ã‘ã¦ã¿ã¾ã™ã€‚ ç°¡å˜ã«ã“ã®ä»•çµ„ã¿ã‚’èª¬æ˜Žã™ã‚‹ã¨ã€ã¾ãšio_setup()ã§éžåŒæœŸI/Oã‚’å‡¦ç†ã™ã‚‹ãŸã‚ã®ç‰¹åˆ¥ãªãƒ¡ãƒ¢ãƒªã‚’ã¨ã‚Šã¾ã™ã€‚io_submit()ã§ãƒªã‚¯ã‚¨ã‚¹ãƒˆã•ã‚ŒãŸI/Oã¯ã‚«ãƒ¼ãƒãƒ«ã‚¹ãƒ¬ãƒƒãƒ‰ã§å®Ÿè¡Œã•ã‚Œã€å®Œäº†ã—ãŸéš›ã«ã“ã®ç‰¹åˆ¥ãªãƒ¡ãƒ¢ãƒªã«å¯¾ã—ã¦ã‚¢ã‚¯ã‚»ã‚¹ã‚’ã—ã€å®Œäº†ã—ãŸã“ã¨ã‚’é€šçŸ¥ã—ã¾ã™ã€‚ ã¾ãšã€io_setup()ã§ã©ã®ã‚ˆã†ãªã“ã¨ã‚’ã—ã¦ã„ã‚‹ã®ã‹ã‚’è¦‹ã¦ã¿ã¾ã™ã€‚ io_setup()é–¢æ•°ã¯ã€ç¬¬ä¸€å¼•æ•°ã«ç™ºè¡Œã™ã‚‹æœ€å¤§ã®I/Oè¦æ±‚æ•°ã€ç¬¬äºŒå¼•æ•°ã«io_context_tã®ãƒã‚¤ãƒ³ã‚¿ã‚’æ¸¡ã•ã‚Œã€ç¬¬ä¸€å¼•æ•°ã®æ•°ã ã‘éžåŒæœŸI/Oã‚’å‡¦ç†ã§ãã‚‹ã‚ˆã†ã«æº–å‚™ã‚’ã—ã€AIOã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆã‚’ç¤ºã™ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã‚’ã•ã™ã‚¢ãƒ‰ãƒ¬ã‚¹ã‚’ç¬¬äºŒå¼•æ•°ã«æ ¼ç´ã—ã¾ã™ã€‚AIOã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆã¨ã¯ã€I/Oã‚³ãƒ³ãƒ†ã‚ã‚¹ãƒˆã®ä¸€ç¨®ã§ã€kioctxã‚ªãƒ–ã‚¸ã‚§ã‚¯
kamipo 2009/04/28
linux

aio
ãƒªãƒ³ã‚¯
ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã«ã‚ˆã‚‹éžåŒæœŸI/O API - takkan_mã®No planãªæ—¥å¸¸
ã“ã®APIã¯ã€ã‚«ãƒ¼ãƒãƒ«2.6ä»¥é™ã«ã‚«ãƒ¼ãƒãƒ«ã«è¿½åŠ ã•ã‚ŒãŸæ©Ÿèƒ½ã‚’ã¤ã‹ã†ãŸã‚ã®ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã«ãªã‚Šã¾ã™ã€‚ ã‚«ãƒ¼ãƒãƒ«ã¯ã€éžåŒæœŸI/Oã‚’ã‚µãƒãƒ¼ãƒˆã™ã‚‹ãŸã‚ã«ã€VFSå±¤ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆ(ç°¡å˜ã«èª¬æ˜Žã™ã‚‹ã¨ã€å®Ÿéš›ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ãŒãƒ•ã‚¡ã‚¤ãƒ«ã«å¯¾ã™ã‚‹æ“ä½œã‚’ä¿æŒã™ã‚‹ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆã ã¨æ€ã„ã¾ã™ã€‚ã“ã®ä¸ã«ã€f_opã¨ã„ã†ãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œã®ãŸã‚ã®é–¢æ•°ãƒ†ãƒ¼ãƒ–ãƒ«ã‚’ã‚‚ã£ã¦ã„ã¾ã™ã€‚ã‚ªãƒ–ã‚¸ã‚§ã‚¯ãƒˆæŒ‡å‘ã«ãŠã‘ã‚‹ã‚¹ãƒ¼ãƒ‘ãƒ¼ã‚¯ãƒ©ã‚¹ã®ã‚ˆã†ãªã‚‚ã®ã§ã™ã€‚)ã®f_opã«ã€ãƒ•ã‚¡ã‚¤ãƒ«æ“ä½œã®aio_read()ã¨aio_write()ã¨ã„ã†ã‚¨ãƒ³ãƒˆãƒªãƒã‚¤ãƒ³ãƒˆãŒã‚‚ã†ã‘ã‚‰ã‚Œã‚‹ã‚ˆã†ã«ãªã‚Šã¾ã—ãŸã€‚(å€‹äººçš„ã«ã€POSIXã®APIã¨åå‰ãŒã‹ã¶ã‚‹ã®ã§ã€ã“ã“ã§ä¸€åº¦æ··ä¹±ã—ã¾ã—ãŸã€‚Linuxã®ã‚«ãƒ¼ãƒãƒ«å‘¨ã‚Šã¯ã€æ—¥æœ¬èªžã«ç›´ã—ã¦ã„ã‚‹ã›ã„ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“ãŒã€åŒã˜åå‰ã§å‘¼ã¹ã‚‹ã‘ã©å®Ÿã¯åˆ¥ç‰©ã¨ã„ã†ã‚‚ã®ãŒã„ãã¤ã‹ã‚ã‚Šã¾ã™ã€‚ã¾ãã€ã§ã‚‚ãã‚Œã¯ãŠã„ãŠã„) ã“ã®APIã‚’ã‚‚ã¡ã„ã‚‹ã¨ã€I/Oå‡¦ç†ã‚’ã‚«ãƒ¼
kamipo 2009/04/28
linux

aio
ãƒªãƒ³ã‚¯
POSIXæº–æ‹ ã®éžåŒæœŸI/O - takkan_mã®No planãªæ—¥å¸¸
ã“ã‚Œã¯ã€ãƒ©ã‚¤ãƒ–ãƒ©ãƒªé–¢æ•°ã¨ã—ã¦å®Ÿè£…ã•ã‚Œã¦ãŠã‚Šã€ä»¥ä¸‹ã®é–¢æ•°ç¾¤ã‚’æŒã¡ã¾ã™ã€‚ aio_read(),aio_write(),aio_fsync(),aio_error() aio_return(),aio_cancel(),aio_suspend()è©³ã—ã„ä½¿ã„æ–¹ã¯èª¬æ˜Žã—ã¾ã›ã‚“ãŒã€aio_read(),aio_write()ã‚’ä½¿ã„ã€I/Oè¦æ±‚ã‚’ç™ºè¡Œã—ã¾ã™ã€‚I/Oè¦æ±‚ã¯ã€ãã‚Œãžã‚Œã®é–¢æ•°ä¸ã§è¦æ±‚ã‚’ç™ºè¡Œã—ãŸæ®µéšŽã§å¾©å¸°ã—ã¦ãã‚Œã¾ã™ã€‚ ã§ã¯æ¬¡ã®ã‚ˆã†ãªã€aio_readã‚’è¡Œã†ãƒ—ãƒã‚°ãƒ©ãƒ ã‚’æ›¸ã„ã¦ã€ã“ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªé–¢æ•°ãŒã©ã®ã‚ˆã†ã«å®Ÿè£…ã•ã‚Œã¦ã„ã‚‹ã‹ã‚’è¦‹ã¦ã¿ã¾ã™ã€‚aio_readã®å‹•ä½œãŒè¦‹ãŸã„ã ã‘ãªã®ã§ã€ãŸã¶ã‚“ã€ã“ã®éžåŒæœŸI/Oãƒ©ã‚¤ãƒ–ãƒ©ãƒªã®ä½¿ã„æ–¹ã¨ã—ã¦ã¯ã€ã ã‚ã ã‚ã§ã™ã€‚ #include <stdlib.h> #include <sys/types.h> #include <sys/stat.h> #include <s
kamipo 2009/04/28
linux

posix

aio
ãƒªãƒ³ã‚¯
AsyncIOã«ã¤ã„ã¦(ãã®2) - æœ€é€Ÿé…ä¿¡ç ”ç©¶ä¼š(@yamaz)
AsyncIOã«ã¤ã„ã¦(ãã®1)ã®ç¶šã. NONBlockã§IOå‡¦ç†ã‚’ã™ã‚‹æ–¹æ³•ã¨ã—ã¦selectã¨ã‚·ã‚°ãƒŠãƒ«ã‚’ä½¿ã†æ–¹æ³•ãŒã‚ã‚‹ã¨ã„ã†ã®ãŒå‰å›žã®è©±ã ã£ãŸãŒ, selectã¯selectã‚ˆã‚Škqueue,epollã§è¿°ã¹ãŸã¨ãŠã‚Š, ãƒ“ã‚¸ãƒ¼ãƒ«ãƒ¼ãƒ—ãŒã‹ã‹ã‚‹ãŸã‚ã‚ã¾ã‚ŠåŠ¹çŽ‡ã¯ã‚ˆããªã,ã‚·ã‚°ãƒŠãƒ«æ–¹å¼ã¯åˆ¶ç´„ãŒã‚ã‚‹ãŸã‚ã‚ã¾ã‚Šä½¿ã„å‹æ‰‹ãŒã‚ˆããªã„. ã¨ã„ã†ã‚ã‘ã§æ–°ã—ãå‡ºã¦ããŸã®ãŒPOSIX Asynchronous I/O(AIO)ã¨ã„ã†æ©Ÿæ§‹ã . ã“ã‚Œã¯IOã®waitã‚’ã‚¤ãƒ™ãƒ³ãƒˆãƒ‰ãƒªãƒ–ãƒ³å½¢å¼ã«ã—ã¦ãƒ“ã‚¸ãƒ¼ãƒ«ãƒ¼ãƒ—ã‚’ãªããã†ã¨ã„ã†ã‚‚ã®ã . ãƒ—ãƒã‚°ãƒ©ãƒ ã®æµã‚Œã¨ã—ã¦ã¯ä¸‹è¨˜ã®ã‚ˆã†ã«ãªã‚‹. 1. å¯¾è±¡ã¨ãªã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã«ã‚·ã‚°ãƒŠãƒ«ãƒãƒ³ãƒ‰ãƒ©ã‚‚ã—ãã¯ã‚¤ãƒ™ãƒ³ãƒˆãƒãƒ³ãƒ‰ãƒ©ã‚’ç™»éŒ²ã—ã¦ãŠã 2. aio_read/aio_writeã‚’å‘¼ã³å‡ºã™ã¨åˆ¶å¾¡ã¯ã™ãã«ãƒ¦ãƒ¼ã‚¶ã«æˆ»ã‚‹. 3ï¼Žå¯¾è±¡ã®ãƒ•ã‚¡ã‚¤ãƒ«ãƒ‡ã‚£ã‚¹ã‚¯ãƒªãƒ—ã‚¿ã®å‡¦ç†ãŒçµ‚ã‚ã‚‹ã¨ç™»éŒ²ã•ã‚Œã¦ã„ãŸãƒãƒ³
kamipo 2009/04/24
linux

aio
ãƒªãƒ³ã‚¯
AsyncIOã«ã¤ã„ã¦(ãã®1) - æœ€é€Ÿé…ä¿¡ç ”ç©¶ä¼š(@yamaz)
æœ€è¿‘ã®OSã«ã¯AsyncIO(AIO)ã¨ã„ã†æ–°ã—ã„I/Oã®ä»•çµ„ã¿ãŒå°Žå…¥ã•ã‚Œã¦ã„ã‚‹ã‚ˆã†ã .lighttpdã®æ¬¡æœŸãƒãƒ¼ã‚¸ãƒ§ãƒ³ã§ã¯AIOã‚’å°Žå…¥ã™ã‚‹ã“ã¨ã§8å‰²ã‚‚ãƒ‘ãƒ•ã‚©ãƒ¼ãƒžãƒ³ã‚¹ãŒä¸ŠãŒã£ãŸã‚ˆã†ã§éžå¸¸ã«èˆˆå‘³æ·±ã„. ã¾ãŸã‚ã¡ã“ã¡ã®Blogã‚’è¦‹ã‚‹é™ã‚ŠNonBlockingI/Oã‚„NonBlockingI/O+ã‚·ã‚°ãƒŠãƒ«ã¨AIOãŒæ··åŒã•ã‚Œã¦ã„ã‚‹æ°—ãŒã—ãŸã®ã§,ãã‚Œã‚‰æ•´ç†ã—ã¦ã¿ãŸã„. ã¯ã˜ã‚ã« I/Oå‡¦ç†ã§ã‚ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã®read/writeã¯å¯¾è±¡ãŒãƒ‡ã‚£ã‚¹ã‚¯ã ã£ãŸã‚Š,ã‚½ã‚±ãƒƒãƒˆã ã£ãŸã‚Šãƒ‡ãƒã‚¤ã‚¹ã ã£ãŸã‚Šã™ã‚‹ã‚ã‘ã ãŒ,é€šå¸¸ã“ã‚Œã‚‰ã®IOå‡¦ç†ã¯CPUå‡¦ç†ã‚„ãƒ¡ãƒ¢ãƒªå‡¦ç†ã«æ¯”ã¹éžå¸¸ã«é…ã„ã“ã¨ãŒçŸ¥ã‚‰ã‚Œã¦ã„ã‚‹. é€šå¸¸readãŒè¡Œã‚ã‚Œã‚‹ã¨readãŒçµ‚ã‚ã‚‹ã¾ã§,æ°¸é ã«å‡¦ç†ã¯æˆ»ã£ã¦ã“ãš,ãƒ—ãƒã‚»ã‚¹çš„ã«ã¯å¾…ã¡çŠ¶æ…‹ã«ãªã£ã¦ã—ã¾ã†.ã“ã‚Œã¯ã€ŒBlockingã€ã¨å‘¼ã°ã‚Œã‚‹. é…ã„ãƒ‡ã‚£ã‚¹ã‚¯ã‚„ãƒ‡ãƒ¼ã‚¿ãŒã„ã¤æ¥ã‚‹ã‹ã‚ã‹ã‚‰ãªã„ã‚½ã‚±ãƒƒãƒˆãªã©ã«å¯¾ã™ã‚‹IOå‡¦ç†ã§ã¯
kamipo 2009/04/24
linux

aio
ãƒªãƒ³ã‚¯
libaio(Linuxã®éžåŒæœŸI/Oãƒ©ã‚¤ãƒ–ãƒ©ãƒª)ã®ä½¿ã„æ–¹ - moratorium
libaio(Linuxã®éžåŒæœŸI/Oãƒ©ã‚¤ãƒ–ãƒ©ãƒª)ã®ä½¿ã„æ–¹ 2007-06-05 (Tue) 4:53 Unix Linuxã§éžåŒæœŸI/Oã‚’è¡Œã†ãŸã‚ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã€Œlibaioã€ã®ä½¿ã„æ–¹ã‚’æ›¸ã„ã¦ã¿ã‚‹äº‹ã«ã™ã‚‹ã€‚å°‘ã—æ˜”ã®è©±ã«ãªã‚‹ãŒã€lighttpdãŒä½¿ç”¨ã—ã€ã‚¹ãƒ«ãƒ¼ãƒ—ãƒƒãƒˆã‚’80%ã‚‚ä¸Šã’ãŸã‚‰ã—ã„ã€‚ TOEFLã«å‘ã‘ã¦è»¢ç½®ãƒ•ã‚¡ã‚¤ãƒ«ã«ã¤ã„ã¦ã®è«–æ–‡(Inverted files for text search engine [moffat 06])ã§Readingå¯¾ç–ã‚’ã—ã¦ã„ãŸã¨ã“ã‚ã€æ„å¤–ã¨ã‚¹ãƒ‹ãƒšãƒƒãƒˆ(æ¤œç´¢ã«ãƒ’ãƒƒãƒˆã—ãŸç®‡æ‰€ã®å‰å¾Œã®æ–‡ç« )ã‚’ä½œã‚‹ã¨ã“ã‚ãŒæ™‚é–“ãŒã‹ã‹ã‚‹ã¨ã„ã†äº‹ã‚’æ•™ãˆã¦ã‚‚ã‚‰ã£ãŸã®ã§ã€é©å½“ã«ãã‚Œã‚’ä¾‹é¡Œã«ã—ã¦ã¿ã‚‹ã€‚å…·ä½“çš„ã«ã¯ä»¥ä¸‹ã®ã‚ˆã†ãªã‚³ãƒ¼ãƒ‰ã‚’éžåŒæœŸI/Oã‚’ä½¿ç”¨ã—ã¦é€Ÿããªã‚‹ã‹ã©ã†ã‹è¦‹ã¦ã¿ã‚‹ã€‚ for (unsigned int i = 0; i < files.size(); i++) { FILE*
kamipo 2009/03/24
éžåŒæœŸI/Oã‚’ä½¿ãˆã°ãƒ•ã‚¡ã‚¤ãƒ«åˆ†ã ã‘I/Oè¦æ±‚ã‚’ä¸€æ°—ã«å‡ºã—ã¦ãŠã‘ã°ã€ãã‚Œã‚’I/O SchedulerãŒè³¢ãã‚¹ã‚±ã‚¸ãƒ¥ãƒ¼ãƒªãƒ³ã‚°ã—ã€å…¨ä½“ã¨ã—ã¦ã®èªã¿è¾¼ã¿æ™‚é–“ã‚’minimizeã™ã‚‹äº‹ãŒå‡ºæ¥ã‚‹ã€‚

linux

aio
ãƒªãƒ³ã‚¯
Linuxã§aio - ï¼ˆã²ï¼‰ãƒ¡ãƒ¢
å®Ÿè£…ãŒ2ã¤ã‚ã‚‹ã€‚ä»¥ä¸‹ã€ã‚ãã¾ã§ä»Šã®æ™‚ç‚¹ã§ã®Linuxã®å ´åˆã®çŠ¶æ³/å®Ÿè£…ã®ãŠã¯ãªã—ã€‚ POSIX aio aio_read(3) ã¨ã‹ aio_write(3), aio_error(3), aio_return(3) ã¨ã‹ã€‚ ã‚¤ãƒ³ã‚¿ãƒ¼ãƒ•ã‚§ãƒ¼ã‚¹ã¯POSIXã§å®šç¾©ã•ã‚Œã¦ã„ã‚‹ã®ã¨åŒã˜ã€‚ ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã˜ã‚ƒãªãã¦ãƒ©ã‚¤ãƒ–ãƒ©ãƒªé–¢æ•°ï¼ˆlibrtï¼‰ è£ã§pthreadã¤ãã£ã¦ãŒã‚“ã°ã£ã¦ã‚‹ã’ã€‚ libaio http://lse.sourceforge.net/io/aio.html http://ftp.jaist.ac.jp/pub/Linux/Fedora/development/source/SRPMS/libaio-0.3.106-3.2.src.rpm ã¨ã‹ io_prep_pread(2), io_prep_pwrite(2), io_submit(2), io_queue_init(2),
kamipo 2009/03/10
linux

aio
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‚
kamipo 2009/03/10
linux

kernel

aio

epoll
ãƒªãƒ³ã‚¯
ãƒžãƒ«ãƒã‚³ã‚¢æ™‚ä»£ã®é«˜é€Ÿã‚µãƒ¼ãƒãƒ¼ã®å®Ÿè£… - Blog by Sadayuki Furuhashi
ç‰¹ã«ã‚µãƒ¼ãƒãƒ¼ç”¨é€”ã§ã¯ã€CPUãŒã‚·ãƒ³ã‚°ãƒ«ã‚³ã‚¢ã«æˆ»ã£ã¦ãã‚‹ã“ã¨ã¯è€ƒãˆã«ãã„ã€‚ ãƒžãƒ«ãƒã‚³ã‚¢CPUã®æ€§èƒ½ã‚’æ´»ã‹ã™ã«ã¯ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ã«å¯¾å¿œã—ãŸã‚µãƒ¼ãƒãƒ¼ã®å®Ÿè£…ãŒå¿…è¦ã«ãªã‚‹ã‚ã‘ã§ã™ãŒã€ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ãªãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã¯å¾€ã€…ã«ã—ã¦ã€Œé«˜è² è·ã«ãªã‚‹ã¨å›ºã¾ã‚‹ã€ã¨ã‹ã€ŒãŸã¾ã«è½ã¡ã‚‹ã€ã¨ã„ã£ãŸæ‚©ã¾ã—ã„ãƒã‚°ã¨æˆ¦ã‚ãªã‘ã‚Œã°ãªã‚‰ãšã€ã‚¤ãƒ¤ã§ã™ã€‚ ã‹ã¨ã„ã£ã¦ã‚·ãƒ³ã‚°ãƒ«ã‚¹ãƒ¬ãƒƒãƒ‰ã§ã¯ã€è¿‘ã„å°†æ¥ 32ã‚³ã‚¢CPU! ãªã©ãŒå‡ºã¦ããŸã¨ãã€ãŸã¶ã‚“æ€§èƒ½ã‚’ç™ºæ®ã§ãã¾ã›ã‚“ã€‚ ãã“ã§ã€ãã“ãã“ãƒ‡ãƒãƒƒã‚°ã—ã‚„ã™ãã€ãã‚Œã§ã„ã¦å¤šã‚³ã‚¢CPUã§ã‚‚ã‚¹ã‚±ãƒ¼ãƒ«ã™ã‚‹ã¨ã„ã†è½ã¨ã—ã©ã“ã‚ã‚’æ¨¡ç´¢ã—ã¦ã„ã‚‹ã®ã§ã™ãŒã€ãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã¯ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯IOå‘¨ã‚Šã«ã‚ã‚‹ã ã‚ã†*1ã¨ã„ã†å‰æã®å…ƒã§ã€ãƒãƒƒãƒˆãƒ¯ãƒ¼ã‚¯IOéƒ¨åˆ†ã ã‘ã‚’ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ã§å‹•ã‹ã—ã€ãã‚Œä»¥å¤–ã®éƒ¨åˆ†ã‚’ã‚·ãƒ³ã‚°ãƒ«ã‚¹ãƒ¬ãƒƒãƒ‰ã§å‹•ã‹ã™ã¨ã„ã†ã‚¢ãƒ¼ã‚ãƒ†ã‚¯ãƒãƒ£ã‚’è€ƒãˆã¦ã„ã¾ã™ã€‚ ãƒã‚¸ãƒƒã‚¯ã®éƒ¨åˆ†ã¯ãƒžãƒ«ãƒã‚¹ãƒ¬ãƒƒãƒ‰ã§æ›¸ã„ã¦ã‚‚å…±æœ‰ãƒªã‚½ãƒ¼ã‚¹ã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹åº¦ã«
kamipo 2008/09/29
ruby

aio

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