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[ãƒ¡ãƒ¢] Apache+mod_sslã§SIGBUSãŒç™ºç”Ÿã—ãŸä»¶
@hirose31ã•ã‚“ã¨ã€Apache HTTPDã‹ã‚‰HTTPSã§ãƒ•ã‚¡ã‚¤ãƒ«ãƒ€ã‚¦ãƒ³ãƒãƒ¼ãƒ‰ä¸ã«ã‚µãƒ¼ãƒãƒ—ãƒã‚»ã‚¹ãŒSIGBUSã§æ»ã¬ã£ã¦ä»¶ã«ã¶ã¡ã‚ãŸã‚Šã€ ã€ŒOpenSSLã®ä¸ã§memcpyãŒSIGBUSã—ã¦ã¾ã™ã€ã€Œãªã€ãªã‚“ã ã£ã¦ãƒ¼ï¼ã€ ã£ã¦èª¿ã¹ãŸã®ã§ã™ãŒã€ç†ç”±ã¯ä»¥ä¸‹ã®ã¨ãŠã‚Šã ã£ãŸã€‚ HTTPSã®å ´åˆã€ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆè¨å®šã ã¨ãƒ•ã‚¡ã‚¤ãƒ«èªè¾¼ã«mmap(2)ãŒä½¿ã‚ã‚Œã‚‹ mmapã•ã‚ŒãŸãƒ•ã‚¡ã‚¤ãƒ«ã®ã‚µã‚¤ã‚ºãŒå¤‰æ›´ã•ã‚Œã¦ã‚‚Apacheã¯ãã‚Œã‚’æ¤œçŸ¥ã—ã‚ˆã†ãŒãªã„ ãã—ã¦ã€ãƒ•ã‚¡ã‚¤ãƒ«æœ«å°¾ä»¥é™ã®ãƒ‡ãƒ¼ã‚¿ã‚’èªã‚‚ã†ã¨ã™ã‚‹ã¨ã‚»ã‚°ãƒ¡ãƒ³ãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ã‚¨ãƒ©ãƒ¼(SIGBUS)ãŒç™ºç”Ÿã—ã€Apacheã®ã‚µãƒ¼ãƒãƒ—ãƒã‚»ã‚¹ã¯ç•°å¸¸çµ‚äº†ã™ã‚‹ HTTPã®å ´åˆã¯ã€ãƒãƒ¼ã‚«ãƒ«ãƒ•ã‚¡ã‚¤ãƒ«ã‚·ã‚¹ãƒ†ãƒ ã®å ´åˆsendfile(2)ãŒä½¿ã‚ã‚Œã‚‹ã®ã§ã€ãƒ•ã‚¡ã‚¤ãƒ«ã‚µã‚¤ã‚ºãŒå¤‰æ›´ã«ãªã£ã¦ã‚‚Apacheã¯ç•°å¸¸çµ‚äº†ã—ãªã„ ãŸã ã—ã€mod_deflateã®ã‚ˆã†ãªå‡ºåŠ›ãƒ•ã‚£ãƒ«ã‚¿ã‚’ä½¿ã£ã¦ã„ã‚‹å ´åˆã¯ã€HTTP
nsyee 2014/05/20
apache

SSL

mmap
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mmapã®ã»ã†ãŒreadã‚ˆã‚Šé€Ÿã„ã¨ã„ã†è¿·ä¿¡ã«ã¤ã„ã¦ - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´
@ITã«ä»¥ä¸‹ã®ã‚ˆã†ãªè¨˜äº‹ãŒå‡ºã¦ã€ ä»Šå›žã‹ã‚‰ã—ã°ã‚‰ãã®é–“ã¯ã€ã¾ã£ãŸãé€†ã®ä¾‹ã€ã¤ã¾ã‚Šä½¿ã†ã¨ãƒ—ãƒã‚°ãƒ©ãƒ ã®å‡¦ç†æ€§èƒ½ãŒä¸ŠãŒã‚‹ã¨ã„ã†ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ç´¹ä»‹ã—ã¦ã„ãã€‚ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’å‘¼ã¶å›žæ•°ã¯å°‘ãªã„æ–¹ãŒå‡¦ç†æ€§èƒ½ã¯é«˜ããªã‚‹ã¨ã„ã†åŽŸå‰‡ã¯å¤‰ã‚ã‚‰ãªã„ãŒã€å‘¼ã³å‡ºã—ã¦ãŠãã¨å‡¦ç†æ€§èƒ½ãŒå‘ä¸Šã™ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã¨ã„ã†ã‚‚ã®ãŒå˜åœ¨ã™ã‚‹ã®ã ã€‚ã“ã†ã—ãŸã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ä½¿ã‚ãªã„ã§ã„ã‚‹ã“ã¨ã¯ã€ã¨ã¦ã‚‚ã‚‚ã£ãŸã„ãªã„ã€‚ ä»Šå›žç´¹ä»‹ã™ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã¯ã€Œmmap(2)ã€ã ã€‚ã“ã“ã§ã¯è©³ã—ãä»•çµ„ã¿ã‚’è§£èª¬ã—ãªã„ãŒã€mmap(2)ã¯ã€ãƒ—ãƒã‚°ãƒ©ãƒ ã®å‡¦ç†æ€§èƒ½ã«å¿…ãšè‰¯ã„å½±éŸ¿ã‚’ä¸Žãˆã‚‹ã€‚ ã‚„ã¯ã‚Šã‚ã£ãŸï¼Ÿ é«˜é€ŸåŒ–ã«åŠ¹ãã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ« (1/2)ï¼šçŸ¥ã£ã¦ãƒˆã‚¯ã™ã‚‹ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ï¼ˆ3ï¼‰ - ï¼ IT ãã‚Œã‚’çœŸã«å—ã‘ãŸã®ã‹ã€ã€ŒGoè¨€èªžã§mmapã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ä½¿ã£ãŸãƒ•ã‚¡ã‚¤ãƒ«èªã¿è¾¼ã¿ã®é«˜é€ŸåŒ–æ¤œè¨Žã¨Cè¨€èªžã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã®è©± - ryochack.blogã€ã®ã‚ˆã†ãªãƒ–ãƒã‚°ã‚¨ãƒ³ãƒˆãƒªã‚‚
nsyee 2013/10/16
mmap
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Goè¨€èªžã§mmapã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ã‚’ä½¿ã£ãŸãƒ•ã‚¡ã‚¤ãƒ«èªã¿è¾¼ã¿ã®é«˜é€ŸåŒ–æ¤œè¨Žã¨Cè¨€èªžã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã®è©± - ryochack.blog
2013.10.14 è¿½è¨˜ @kazuho ã•ã‚“ã‹ã‚‰ã”æŒ‡æ‘˜ã„ãŸã ãã¾ã—ãŸï¼ mmapã®ã»ã†ãŒreadã‚ˆã‚Šé€Ÿã„ã¨ã„ã†è¿·ä¿¡ã«ã¤ã„ã¦ - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´ - é•·ã„ã‚¿ã‚¤ãƒˆãƒ«â€¦ã€‚ ã“ãªã„ã æ›¸ã„ãŸgorepã£ã¦ã„ã†æ¤œç´¢ãƒ„ãƒ¼ãƒ«ã€ã‚‚ã†ã¡ã‚‡ã£ã¨é€Ÿãã—ãŸã„ãªã¨æ€ã£ã¦ãƒ•ã‚¡ã‚¤ãƒ«èªã¿è¾¼ã¿ã®éƒ¨åˆ†ã‚’mmap()ã§ç½®ãæ›ãˆã‚‹æ¤œè¨Žä¸ã€‚(ã¡ã‚‡ã£ã±ã‚„ã®agã‚‚mmap()ã‚’ä½¿ã£ã¦ã„ã‚‹) mmap()ã§ã®é«˜é€ŸåŒ–ç¢ºèªç”¨ã«Cã¨Goã§ç°¡å˜ãªã‚³ãƒ¼ãƒ‰æ›¸ã„ã¦å®Ÿé¨“ã—ã¦ã„ãŸã‚‰ã€ä»¥ä¸‹ã®ã“ã¨ãŒã‚ã‹ã£ãŸã€‚ ãƒ•ã‚¡ã‚¤ãƒ«èªã¿è¾¼ã¿ã‚’mmap()ã«ç½®ãæ›ãˆã‚‹ã¨é«˜é€ŸåŒ–ãŒæœ›ã‚ãã† Goã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã®æœ€é©åŒ–ã¯ãªã‹ãªã‹å„ªç§€ã§ã€Cã®GCCãƒ“ãƒ«ãƒ‰ã‚ˆã‚Šã‚‚é€Ÿããªã‚‹ã“ã¨ãŒã‚ã‚Šãã† LLVM-Clangã¯åŠç«¯ã˜ã‚ƒãªã„ å‡¦ç†é€Ÿåº¦æ¯”è¼ƒã®æº–å‚™ æ¯”è¼ƒç”¨ã«æ›¸ã„ãŸã®ã¯ã€open()/read()ã¨ã€open()/mmap()ã€ãã—ã¦fopen()/fread()ã‚’è¡Œã†Cã¨Goã®ã‚³ãƒ¼ãƒ‰
nsyee 2013/07/21
Go

mmap

benchmark

C

LLVM
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Cè¨€èªž: UNIXæœ€é€Ÿãƒ•ã‚¡ã‚¤ãƒ«ã‚³ãƒ”ãƒ¼
Created: Kazuki Ohta, 2006/06/14 Last Update: Kazuki Ohta, 2006/06/14 ã€Œwrite(2)ã®æ£ã—ã„ä½¿ã„æ–¹ã€ã¨åŒã˜ãã€OSæ¼”ç¿’ã§ã‚„ã£ãŸäº‹ã®å»¶é•·ç·šã®è¨˜äº‹ã‚’æ›¸ã„ã¦ã¿ã‚‹ã€‚ãŠé¡Œã¯ã€ŒUNIXä¸Šã§å¤§è¦æ¨¡ãƒ•ã‚¡ã‚¤ãƒ«ã‚’æœ€é€Ÿã§ã‚³ãƒ”ãƒ¼ã™ã‚‹æ–¹æ³•ã€ã ã€‚ä¸€èˆ¬çš„ã«ã€UNIXã§ãƒ•ã‚¡ã‚¤ãƒ«ã‚’copyã™ã‚‹éš›ã«ã¯ä»¥ä¸‹ã®ã‚ˆã†ãªæ–¹æ³•ãŒæœ‰ã‚‹ã€‚ read -> write read -> write with posix_fadvice mmap -> mmap -> memcpy -> fsync mmap -> mmap -> memcpy -> fsync with madvise mmap -> write mmap -> write with madvise read, write, mmapè¾ºã‚Šã¯è‰¯ã„ã¨ã—ã¦ã€posix_fadviseã¨ã„ã†ã‚·ã‚¹ãƒ†ãƒ ã‚³ãƒ¼ãƒ«ãŒæœ‰
nsyee 2010/12/19
C

mmap

Linux

file

benchmark
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