Hi List
One of my servers is acting very strangely memory wise - it has 4GB of
memory and it is always full, and I don't mean in the "not a lot of free
memory" kind of full, but in the "application memory takes more then
3GB" kind of full.
I ran a simple script to compare how many resident memory PS reports
compared to what free reports is being used for stuff other then cache
and buffers, and I got these interesting results:
This is a normal which is very loaded and by right - it has a java
application which is set to 2GB heap and uses it just fine:
# ps auwx | perl -nle 'split/\s+/; $sum += $_[5]; END { print "sum:
$sum"; }'; free
sum: 3158192
total used free shared buffers
cached
Mem: 4063412 4029396 34016 0 20016
360368
-/+ buffers/cache: 3649012 414400
Swap: 4194296 354188 3840108
So we can see PS reports 3.1GB is used by applications and free reports
3.6GB of used memory (except buffers and cache). so I'm missing about
half a gig, but I don't mind that much.
Here is the broken server:
# ps auwx | perl -nle 'split/\s+/; $sum += $_[5]; END { print "sum:
$sum"; }'; free
sum: 1367356
total used free shared buffers
cached
Mem: 4063412 4038212 25200 0 35604
726268
-/+ buffers/cache: 3276340 787072
Swap: 4194296 656508 3537788
which is mind boggling - there's a 2GB difference, about half my total
amount of memory! Where did all my memory gone too ?
Now that server is also constantly spends tons of time in kswapd and on
IO - thrashing if you want and I'm not sure if its a symptom or the
cause.
Do note that both are production servers and I can't really restart them
or anything, even taking down services is a long and annoying process.
Please throw your two cents my way, thanks.
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