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 The shared memory column should be ignored; it is obsolete.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