Re: Where's all my memory going?

[Bruce Guenter]

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On Wed, Jan 09, 2002 at 08:36:13PM -0200, Rik van Riel wrote:
> Matt's system seems to go from 900 MB free to about
> 300 MB (free + cache).
>=20
> I doubt qmail would eat 600 MB of RAM (it might, I
> just doubt it) so I'm curious where the RAM is going.

I am seeing the same symptoms, with similar use -- ext3 filesystems
running qmail.  Adding up the RSS of all the processes in use gives
about 75MB, while free shows:

             total       used       free     shared    buffers     cached
Mem:        901068     894088       6980          0     157568     113856
-/+ buffers/cache:     622664     278404
Swap:      1028152      10468    1017684

This are fairly consistent numbers.  buffers hovers around 150MB and
cached around 110MB all day.  The server is heavy on write traffic.

> Matt, do you see any suspiciously high numbers in
> /proc/slabinfo ?

What would be suspiciously high?  The four biggest numbers I see are:

inode_cache       139772 204760    480 25589 25595    1
dentry_cache      184024 326550    128 10885 10885    1
buffer_head       166620 220480     96 4487 5512    1
size-64           102388 174876     64 2964 2964    1

I can post complete details for any who wish to investigate further.  I
am not seeing a huge slowdown, but I have no real baseline to compare
against.
--=20
Bruce Guenter <[e-mail]> http://em.ca/~bruceg/ http://untroubled.org/
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