Unix - Memory and Disk Usages

• Statistics of process, virtual memory, disk, trap and cpu activity:
  
  # vmstat -m
  
  

           Type InUse MemUse HighUse Requests  Size(s)
         USBdev    32     3K       -       50  32,64,128,256,2048
            USB    56    18K       -       95  16,32,64,128,512,2048,4096
         isadev    10     1K       -       10  64
       ppbusdev     3     1K       -        3  128
           cdev     7     1K       -        7  128
        entropy  1024    64K       -     1024  64
          sigio     1     1K       -        1  32
       filedesc    46    12K       -   291905  16,32,256,512,2048
        kdtrace   248    54K       -   273670  64,256
           kenv    83     7K       -       92  16,32,64,128,4096
  ...
  



• Swap memory usage
  
  # swapinfo
  
  

  Device          1K-blocks     Used    Avail Capacity
  /dev/ada0p3       4194304      424  4193880     0%



• Top processes on the system
  
  # top -d1
  
  

  last pid: 73598;  load averages:  0.00,  0.00,  0.00                                                                           
  26 processes:  1 running, 25 sleeping
  CPU:     % user,     % nice,     % system,     % interrupt,     % idle
  Mem: 114M Active, 1683M Inact, 234M Wired, 121M Cache, 91M Buf, 843M Free
  Swap: 4096M Total, 424K Used, 4095M Free
  
    PID USER  THR PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
   1130 root    1  20    0 11296K  2944K select  0   0:39  0.00% sendmail
   1137 root    1  20    0  9584K  1380K nanslp  0   0:10  0.00% cron
   1003 root    1  20    0  9544K  1300K select  1   0:05  0.00% syslogd
  70226 vijay   1  20    0 15852K  4200K select  1   0:03  0.00% sshd
  70186 root    1  20    0 15852K  3992K select  0   0:03  0.00% sshd
    928 root    1  29    0  9544K  1364K select  0   0:02  0.00% dhclient
    966 _dhcp   1  20    0  9544K  1408K select  1   0:01  0.00% dhclient
    813 root    1  20    0 12132K  2868K select  1   0:01  0.00% devd
   1133 smmsp   1  20    0 11296K  2816K pause   1   0:01  0.00% sendmail
  71182 root    1  20    0 11256K  2940K select  1   0:01  0.00% ntpd
  70223 root    1  20    0 15852K  4056K select  1   0:00  0.00% sshd
   1127 root    1  20    0 13096K  3148K select  1   0:00  0.00% sshd
  70189 root    1  20    0 10864K  3188K pause   0   0:00  0.00% csh
   1183 root    1  20   -4 10092K  1868K ttyin   1   0:00  0.00% login
  73598 root    1  20    0  9872K  2008K CPU1    1   0:00  0.00% top
   1185 root    1  52    0  9544K  1240K ttyin   1   0:00  0.00% getty
   1187 root    1  52    0  9544K  1240K ttyin   1   0:00  0.00% getty
   1189 root    1  52    0  9544K  1240K ttyin   0   0:00  0.00% getty
   1188 root    1  52    0  9544K  1240K ttyin   0   0:00  0.00% getty
  ...
  



• Finding size of folders (total size of files and subfolders underneath)
  
  
  • # du –sh myfolder
  
  
  • # du –sh * => Size of all the folders in the current directory
  
  
  • # du –sk | sort –n => Size of folders, sorted by size (k  kilo byte. h gives false sorting results)