Re: Where's all my memory going?

[Matt Dainty <matt@bodgit-n-scarper.com>]

On Thu, Jan 10, 2002 at 03:36:39PM -0700, Andreas Dilger wrote:
> 
> In any case, you also pointed out the same thing I did, namely that these
> slab entries (while having some high numbers) do not account for the large
> amount of used memory in the system.  Maybe SysRQ-M output can help a bit?

Running this on the box after it's settled down a bit, (over the weekend,
the usage hasn't altered), with all mail delivered and collected so the box
is currently quiet, produces the following 'free' output:

root@plum:~# free
             total       used       free     shared    buffers     cached
Mem:       1029524     965344      64180          0      45204      22936
-/+ buffers/cache:     897204     132320
Swap:      2097136        116    2097020

And SysRQ+M yields the following:

SysRq : Show Memory
Mem-info:
Free pages:       66612kB (  4424kB HighMem)
Zone:DMA freepages:  4848kB min:   128kB low:   256kB high:   384kB
Zone:Normal freepages: 57340kB min:  1020kB low:  2040kB high:  3060kB
Zone:HighMem freepages:  4424kB min:  1020kB low:  2040kB high:  3060kB
( Active: 160155, inactive: 58253, free: 16653 )
124*4kB 98*8kB 41*16kB 13*32kB 3*64kB 0*128kB 1*256kB 0*512kB 0*1024kB 1*2048kB = 4848kB)
11029*4kB 1097*8kB 140*16kB 7*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB = 57340kB)
328*4kB 55*8kB 19*16kB 10*32kB 2*64kB 3*128kB 0*256kB 1*512kB 1*1024kB 0*2048kB = 4424kB)
Swap cache: add 48, delete 24, find 13/14, race 0+0
Free swap:       2097020kB
262128 pages of RAM
32752 pages of HIGHMEM
4747 reserved pages
20447 pages shared
24 pages swap cached
0 pages in page table cache
Buffer memory:    44424kB
    CLEAN: 209114 buffers, 836405 kbyte, 188 used (last=209112), 0 locked, 0 dirty
                           ^^^^^^ Is this our magic value?
    DIRTY: 8 buffers, 32 kbyte, 0 used (last=0), 0 locked, 8 dirty

Cheers

Matt
-- 
"Phased plasma rifle in a forty-watt range?"
"Hey, just what you see, pal"