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  Too many open files ¿¡·¯¹ß»ý½Ã ÀÛ¼ºÀÏ : 2006/07/11 14:51
 
  • ±Û¾´ÀÌ : ÁÁÀºÁøÈ£ ( http://coffeenix.net/ )
  • Á¶È¸¼ö : 31943
          [ ÀÌÀüÈ­¸é / ¼öÁ¤ ]   ºñ¹Ð¹øÈ£ :     Àμâ¿ë È­¸é
      Á¦  ¸ñ : Too many open files ¿¡·¯¹ß»ý½Ã
    ÀÛ¼ºÀÚ : ÁÁÀºÁøÈ£(truefeel, http://coffeenix.net/ )
    ÀÛ¼ºÀÏ : 2006.7.10(¿ù)

    ÀÚ¹Ù¿¡¼­ ´ÙÀ½°ú °°Àº ¿¡·¯°¡ ¹ß»ýÇß´Ù¸é FD(File Descriptor)¸¦ ´Ã·ÁÁà¾ß ÇÑ´Ù.

     
    java.net.SocketException: Too many open files
            at java.net.PlainSocketImpl.socketAccept(Native Method)
            at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:353)
            at java.net.ServerSocket.implAccept(ServerSocket.java:448)
            at java.net.ServerSocket.accept(ServerSocket.java:419)
    ... »ý·« ...
     


    1. open files ÃÖ´ë °³¼ö È®ÀÎ

    ¸ÕÀú ulimit -a À¸·Î open files °³¼ö¸¦ È®ÀÎÇÑ´Ù. ulimit -aH´Â hard limit, -aS´Â sort limit¸¦ È®ÀÎ.
    csh ½©À» »ç¿ëÇϸé limit ¸í·ÉÀ¸·Î »ìÆ캼 ¼ö ÀÖ´Ù.

     
    $ ulimit -a
    core file size          (blocks, -c) 0
    data seg size           (kbytes, -d) unlimited
    file size               (blocks, -f) unlimited
    pending signals                 (-i) 1024
    max locked memory       (kbytes, -l) 32
    max memory size         (kbytes, -m) unlimited
    open files                      (-n) 1024
    pipe size            (512 bytes, -p) 8
    POSIX message queues     (bytes, -q) 819200
    stack size              (kbytes, -s) 10240
    cpu time               (seconds, -t) unlimited
    max user processes              (-u) 69632
    virtual memory          (kbytes, -v) unlimited
    file locks                      (-x) unlimited
     


    2. ÇÁ·Î¼¼½ºº°·Î ¿ÀÇÂµÈ ÆÄÀÏ °³¼ö È®ÀÎ

    ¿­¸° ÆÄÀÏ

    lsof ¸í·ÉÀ¸·Î È®ÀÎÇÒ ¼ö ÀÖ´Ù. ÁöÁ¤ÇÑ ÇÁ·Î¼¼½º°¡ ¸î°³ÀÇ ÆÄÀÏÀ» »ç¿ëÁßÀÎÁö¸¦ È®ÀÎÇÒ ¶§´Â ´ÙÀ½Ã³·³ ½ÇÇà
    ÇÏ¸é ¾Ë ¼ö ÀÖ´Ù.

    lsof -p PID | wc -l

    1234, 1236 PID 2°³¿¡ ´ëÇØ »ìÆ캻´Ù¸é ÄÞ¸¶(,)·Î PID¸¦ ±¸ºÐÇؼ­ Àû¾îÁÖ¸é µÈ´Ù.

     
    $ lsof -p 1234,1236 |wc -l
     


    3. ÆÄÀÏ°³¼ö ´Ã¸®±â

    ¸®´ª½ºÈ¯°æÀ» ±âÁØÀ¸·Î ¼³¸íÇÑ´Ù. truefeel »ç¿ëÀÚÀÇ open files°³¼ö¸¦ 4096(sort limit),
    6144(hard limit) ·Î Á¦ÇÑÇÑ´Ù¸é /etc/security/limits.conf¿¡ ´ÙÀ½ ÁÙÀ» Ãß°¡ÇØÁÖ¸é ·Î±ä½Ã Àû¿ëµÈ´Ù.

     
    truefeel         soft    nofile          4096
    truefeel         hard    nofile          6144
     


    4. Âü°í ÀÚ·á

    * Too Many Open Files Exception
      http://kr.bea.com/files/services/customer_support/best_tip/06_200406/06_2_14.pdf

    * Too many open files
      http://kr.bea.com/services/customer_support/SupportPattern/08_15_Too_Many_Open_Files_Pattern.html
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