Red Hat ENTERPRISE LINUX 3 Reference Manual page 73

proc
Chapter 5. The
Buffers:
Cached:
SwapCached:
Active:
ActiveAnon:
ActiveCache:
Inact_dirty:
Inact_laundry:
Inact_clean:
Inact_target:
HighTotal:
HighFree:
LowTotal: 125676 kB
LowFree:
SwapTotal: 1077240 kB
SwapFree: 1045236 kB
HugePages_Total:
HugePages_Free:
Hugepagesize:
Much of the information here is used by the
command is similar in appearance to the contents and structure of
free
looking directly at
/proc/meminfo
— The current state of physical RAM in the system, including a full breakdown of total, used,
• Mem
free, shared, buffered, and cached memory utilization in bytes.
— The total, used, and free amounts of swap space, in bytes.
• Swap
— Total amount of physical RAM, in kilobytes.
• MemTotal
— The amount of physical RAM, in kilobytes, left unused by the system.
• MemFree
— Unused with 2.4 and higher kernels but left in for compatibility with earlier kernel
• MemShared
versions.
— The amount of physical RAM, in kilobytes, used for file buffers.
• Buffers
— The amount of physical RAM, in kilobytes, used as cache memory.
• Cached
— The amount of swap, in kilobytes, used as cache memory.
• SwapCached
— The total amount of buffer or page cache memory, in kilobytes, that is in active use.
• Active
— The total amount of buffer or cache pages, in kilobytes, estimated to be free and
• Inact_dirty
available.
• Inact_laundry
become free and available, possibly after disk IO for these pages has finished.
— The total amount of buffer or cache pages, in kilobytes, that are free and available.
• Inact_clean
— The net amount of allocations per second, in kilobytes, averaged over one
• Inact_target
minute. This is a deprecated statistic which has little meaning on modern systems.
and
• HighTotal HighFree
directly mapped into kernel space. The
used.
and
• LowTotal LowFree
mapped into kernel space. The
— The total amount of swap available, in kilobytes.
• SwapTotal
— The total amount of swap free, in kilobytes.
• SwapFree
File System
9076 kB
34204 kB
12636 kB
79352 kB
57308 kB
22044 kB
240 kB
17468 kB
984 kB
19608 kB
0 kB
0 kB
7304 kB
2
2
2096 kB
, more details are revealed:
— The total amount of buffer or cache pages, in kilobytes, that are about to
— The total and free amount of memory, in kilobytes, that is not
— The total and free amount of memory, in kilobytes, that is directly
LowTotal
, , and
free top ps
value can vary based on the type of kernel
HighTotal
value can vary based on the type of kernel used.
commands. In fact, the output of the
/proc/meminfo
55
. But by