C言語: UNIX最速ファイルコピーCreated: Kazuki Ohta, 2006/06/14 Last Update: Kazuki Ohta, 2006/06/14 「write(2)ã®æ£ã—ã„使ã„æ–¹ã€ã¨åŒã˜ãã€OS演習ã§ã‚„ã£ãŸäº‹ã®å»¶é•·ç·šã®è¨˜äº‹ã‚’書ã„ã¦ã¿ã‚‹ã€‚ãŠé¡Œã¯ã€ŒUNIX上ã§å¤§è¦æ¨¡ãƒ•ã‚¡ã‚¤ãƒ«ã‚’最速ã§ã‚³ãƒ”ーã™ã‚‹æ–¹æ³•ã€ã 。一般的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, mmap辺りã¯è‰¯ã„ã¨ã—ã¦ã€posix_fadviseã¨ã„ã†ã‚·ã‚¹ãƒ†ãƒ コールãŒæœ‰
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