Bob Sparks writes:
>Linux "uses" most of the memory, most of the time. It has the kernel,
>and the applications, in memory. It uses all but a few MB of the rest
>for disk buffers. Any time the applications, etc. need more memory,
>Linux flushes some disk buffers, and frees up the memory. This is
>one reason why Linux is faster under many circumstances, because
>it is constantly trying to use all resources to their fullest.
Along those lines, I have a question too. Here's my memory usage at
the moment:
vanzandt:~$ cat /proc/meminfo
total: used: free: shared: buffers: cached:
Mem: 64524288 41836544 22687744 25706496 9859072 15622144
Swap: 106885120 0 106885120
MemTotal: 63012 kB
MemFree: 22156 kB
MemShared: 25104 kB
Buffers: 9628 kB
Cached: 15256 kB
SwapTotal: 104380 kB
SwapFree: 104380 kB
vanzandt:~$ calc 22687744+41836544
64524288
vanzandt:~$ calc 25706496+9859072+15622144
51187712
vanzandt:~$ calc 25706496+9859072
35565568
I understand the first three entries, I think. (I only just booted
this machine, so it has not buffered much from the disk, and has not
swapped anything out.) I assume the 25M of "shared" includes all the
shared libraries I'm using. I also assume that "buffers" have copies
of data recently read from and/or written to the disk. However,
I don't know what "cached" refers to. Apparently the last three
categories are not distinct, because they add up to more than "used".
Is anyone willing to fill me in?
- Jim Van Zandt
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