memory usage

memory usage

[Jiu Zheng]

I have some questions about memory usage:

If you type cat /proc/meminfo, you can see the following messages,

           total:          used:           free:         shared:
buffers:     cached:
Mem:  15015936 10260480   4755456  6352896  1523712  6025216
Swap: 98697216          4096 98693120
MemTotal:     14664 kB
MemFree:       4644 kB
MemShared:     6204 kB
Buffers:       1488 kB
Cached:        5884 kB
SwapTotal:    96384 kB
SwapFree:     96380 kB

Can anybody explain what EXACTLY are shared, buffers, and cached?
One can also get memory usage information of all processes by typing "ps
aux".
Are the numbers (in "RSS" collomn?) having any relationship with those
in /proc/meminfo ?

Thanks,

Jiu


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Memory Usage

[Srikanta R]

Hi all,

Which variable in /proc/meminfo (using 2.4.8 kernel)gives me the
correct memory usage at any point of time.
The problem is when I run my application, the "MemFree:" variable under
/proc/meminfo drops from around 25MB to 16MB. I kill the application
and "MemFree:" shows 17MB. How do I get the actual Memory being used ? ie
after I kill the application I should get "MemFree: = 25MB".

If I do the calculation which is being done in procedure -
nr_free_buffer_pages() (linux/mm/page_alloc.c) i.e adding the
zone->free_pages ,zone->inactive_clean_pages,
zone->inactive_dirty_pages, for all the zones, do I get the exact free RAM
available at any point of time(taking into consideration caching and all)
?

Thanks for any help or pointers.

Rgds,
Srikanta.

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