Linux命令：FREE

FREE(1)                       Linux User's Manual                      FREE(1)

 

NAME

       free - Display amount of free and used memory in the system

 

SYNOPSIS

       free [-b | -k | -m] [-o] [-s delay ] [-t] [-l] [-V]

 

DESCRIPTION

       free  displays the total amount of free and used physical and swap memory in the system, as well as the buffers used by the kernel.  The shared memory column should be ignored; it is obsolete.

 

   Options

       The -b switch displays the amount of memory in bytes; the -k switch (set by default) displays it in kilobytes; the -m  switch  displays  it  in megabytes.

 

       The -t switch displays a line containing the totals.

 

       The  -o switch disables the display of a "buffer adjusted" line.  If the -o option is not specified, free subtracts buffer memory from the used memory and adds it to the free memory reported.

 

       The -s switch activates continuous polling delay seconds apart. You may actually specify any floating point number for delay, usleep(3) is used for microsecond resolution delay times.

 

       The -l switch shows detailed low and high memory statistics.

 

       The -V switch displays version information.

 

FILES

       /proc/meminfo-- memory information

 

SEE ALSO

       ps(1), slabtop(1), vmstat(8), top(1)

 

AUTHORS

       Written by Brian Edmonds.

 

       Send bug reports to <albert@users.sf.net>

 

Cohesive Systems                 20 Mar 1993                           FREE(1)

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示例：

root@Slave3.Hadoop:[/root]free -m -t
             total       used       free     shared    buffers     cached
Mem:          8002       7747        254          0         44       2174
-/+ buffers/cache:       5528       2473
Swap:         8015       3002       5013
Total:       16018      10750       5267