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On Thu, 7 Apr 2011, Dan Dart wrote:
On 7 Apr 2011 18:10, "Gordon Henderson" <gordon+dcglug@xxxxxxxxxx> wrote: On Thu, 7 Apr 2011, Gibbs wrote:I don't know a great deal about memory usage but I'm struggling ...High usage is generally fine - if you've got the RAM for it ;-) However I'm surprised at the zeros in the buffer/cache, but it might be that the VPS system, your host is using forces that (and it's accounted for elsewhere?) Have you tried looking at top, sorted by memory (hit capital M)? Each instance of https, while sharing the actual code will have it's own data space - and the size of that will be goverend by the type of website running - php, etc. will all eat memory and it might not be released until that instance of httpd dies - does amavis use a lot of memory each time it doe a scan? Same for clam - there will be a difference in the system in the middle of the night vs. through the day when it's busier.. Maybe your server really is busy - especially if you've got few popular sites on it..
The zeros mean you have no swap. You might want to look into getting some... mkswap /dev/xxx swapon /dev/xxx et al.
(pasting in Gibbs original numbers again)
total used free shared buffers cached Mem: 960 807 152 0 0 0 -/+ buffers/cache: 807 152 Swap: 0 0 0
I was referring to the zeros under shared, buffers & cached - as I think was Gibbs...
His VPS provider (if it's who I think it is) has a policy of not allowing swap for their virtual servers - and that's quite a reasonable policy.
However, it's perfectly feasible to have no swap and still have buffer/cache memory in-use - as this demonstrates:
# free -m
total used free shared buffers cached
Mem: 2003 1781 221 0 252 733
-/+ buffers/cache: 795 1208
Swap: 0 0 0
Which is my workstation...
I suppose it's possible that there really is no memory left-over for
buffers/cache, etc. when you're really tight on resources, but I've never
seen it that bad... And a quick check on a couple of servers I have which
are using a little bit of swap shows that they still have a good few 100MB
allocated to buffers & cache...
Gordon -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq