Checking open file descriptors
==============================

Public domain    
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### General
    
    # cat /proc/sys/fs/file-max 
    309551
    
    # cat /proc/sys/fs/file-nr
     1309    0       309551
     |       |       |
     |       |       |
     |       |       maximum open file descriptors
     |       total free allocated file descriptors
     total allocated file descriptors
     (the number of file descriptors allocated since boot)
    
    # lsof | wc -l
     2110
    
    
    
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### Per PID
    
    # ps -A | grep squid
     2458 ?        00:00:00 squid
     2460 ?        00:01:42 squid
    
    # netstat  -tunapo | grep squid | tail -n 1
     udp        0        0 0.0.0.0:3401        0.0.0.0:*        2460/(squid)        off (0.00/0/0)
    
    # lsof | grep 2460 | wc -l
     1050
    
    # ls -l  /proc/2460/fd/ | wc -l
     1099

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_BY: Pejman Moghadam_  
_TAG: filedescriptor_  
_DATE: 2007-11-09 19:07:13_